Mrs. Roper aroper@ihmschoolmd.org

Updated: May 29, 2018

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Mrs. Roper's Science Homework:
May 29, 2018: Today 8H and 8M finished watching Hidden Figures. 8I painted rocks for their prayer partners. Tomorrow 8H and 8M will paint rocks for their prayer partners and give them to them during 4th period.
May 25, 2018: Today the 8th graders took the Math Final Exam. Next week students will work on gifts for their prayer partners. Have a great weekend!
May 24, 2018: Today the 8th graders took the Social Studies Final Exam. 8I was able to watch the rest of the Christa McAuliffe documentary. Tomorrow the students will take their last exam: Math. The students are able to wear spirit wear with their gym shorts in exchange for bringing in cake mixes, frosting, or muffin mixes.
May 23, 2018: Today the 8th graders took the Religion Final Exam. 8I was able to watch the first part of Christa McAullife: Reach for the Stars movie. Tomorrow the students will take the Social Studies Exam.
May 22, 2018: Today the 8th graders took the Science Final Exam. 8I was able to watch the end of Hidden Figures. Tomorrow the students will take the Religion Final Exam.
May 21, 2018: Today the 8th graders took the ELA Final Exam. They will take the Science Final tomorrow. Students need to bring calculators! 8I watched Hidden Figures. The Science Final Exam Review Guide answers are posted below:
May 17, 2018: The students got the correct answers for the science final exam review guide. They also participated in a review activity. The Science Final exam is scheduled for next Tuesday, 5/22.
May 16, 2018: The students received their Science Final Exam Review guide today. They watched a review video about electricity and were given time to work on their review guide. Their homework is to complete the review guide.
May 14, 2018: The students completed their second and final math activity related to the Hidden figures movie. On Wednesday they will get a review guide for the final science exam. Field trip tomorrow! Please have your child here at school at 7:15 AM!
May 11, 2018: The students watched more of 'Hidden Figures'. There is no homework for the weekend..
May 10, 2018: The students learned how to interpret and use binary code. They were able to write their names in binary code. There is no homework tonight.
May 9, 2018: The students watched more of Hidden Figures movie. Tomorrow, they will complete a math activity related to the movie. The students were also able to take the Temperature retake quiz at recess today, which was optional.
May 8, 2018: The students took the Thermal Energy quiz today. They also started 'Hidden Figures' movie. They will be completing two math/science activities that are related to the movie before they start reviewing for the final exam.
May 4, 2018: The students took notes about radiation, the third as last, type of heat transfer. They completed a rotation activity where they identified pictures as being one of the three types. The students will take an opennote quiz on Tuesday, 5/8. Students are allowed to use their notes.
May 3, 2018: The students presented their conduction experiment posters today. They did a really good job! They also took notes about convection currents. They do not have homework tonight.
April 2, 2018: The students took a Temperature Quiz today. They then helped me replenish resurrection gardens for homeroom teachers. I thank them for their help!
April 30,. 2018: The students took a Temperature Practice Quiz today and finished their conduction experiment posters. They will take the Temperature Quiz and present their posters on Wednesday. Their homework is to study for the Temperature Quiz.
April 27, 2018: The students continued work on their conduction experiment posters today. 8M presented their Maglev Projects. The students will take a practice quiz on Monday in preparation for their Temperature Quiz on Wednesday. They do not have homework this weekend, other than reviewing information in preparation for the temperature practice quiz.
April 26, 2018: Most of the students finished collecting their data and some are working on their rough and final drafts of their graphs. A Temperature Quiz is scheduled for Wednesday, May 2nd. This quiz will test temperature conversions and predicted temperature of mixed waters.
April 25, 2018: The students were able to collect some more data for their designed experiment. They will complete the data collection tomorrow. There is no homework tonight.
April 24, 2018: Today the students completed conduction notes and chose a problem statement for their experiment. They were able to start collecting data. There is no homework tonight. Students received permission slip forms for the retreat and the Philadelphia trip. They need to be returned ASAP.
April 23, 2018: Today the students took notes about conduction and collected data in which they measured the change in temperature in room temperature water after a hot hexnut was placed in it. Students do not have homework tonight. I collected the homework from Friday and the Temperture and Activity worksheet.
April 20, 2018: The students measured the temperature of samples of water, calculated the predicted combined temperature, then combined the water to see how close they got to the measurement. Their homework tonight is 'Temperature HW' worksheet.
April 19, 2018: 8I presented their maglev projects today. 8H and 8M will present their projects on Monday. Today all students learned how to calculate the final temperature of two samples of water combined. Tomorrow they will combine samples of water to predict and measure the actual temperature. Their homework is 'Temperature Conversion WS', due tomorrow.
April 18, 2018: 8I completed the temperature conversion activity. 8H and 8M will finish tomorrow. They do not have homework tonight.
April 17, 2018: The students learned how to covert Celcius, Kelvin, and Fahrenheit temperatures and started a rotation activity. They will finish this activity tomorrow. They do not have homework tonight.
April 16, 2018: Students worked on their Maglev Project today and most finished it. Any other work on it needs to happen during recess. Tomorrow they start the thermal energy unit. There is no homework tonight.
April 13, 2018: 8H and 8M both worked on their maglev project. There is no homework.
April 12, 2018: 8H helped me plant spring bulbs for fundraiser. I thank them for their help! 8M and 8I worked on their maglev project. There is no homework tonight.
April 11, 2018: I only saw 8I today for class. They helped me plant spring bulbs for the science fundraiser. I thank them for their help!
April 10, 2018: The students today received the correct answers for the Booklet and their Practice Test. The students worked on a review activity related to the practice test. Their homework is to get a good night's rest and to eat a good breakfast in preparation for the standardized testing tomorrow.
April 9, 2018: Welcome back, everyone! Today, the students took a practice IOWA test. We will go over the answers for this practice test tomorrow. The students' homework is to complete the booklet I gave to students today. We will go over those answers tomorrow as well.

March 28, 2018: 8H and 8M should have shared their online electromagnetic activity to me by today. They were assigned groups for the Maglev Controversy project. 8I continued work on the Maglev project. They will continue the Maglev project after Easter Break.

March 27, 2018: 8I completed the Magnet Conclusion Statement. 8H and 8I started the Maglev Train Project. 8M will start the project tomorrow.
March 26, 2018: 8M completed the Magnet Conclusion statement in class today. 8I will finish tomorrow. 8H and 8M will finish the online electromagnetic assignment tomorrow. There is no homework tonight.
March 23, 2018: 8H students wrote a Magnet Conclusion Statement today. 8M and 8I will write the statement on Monday. I collected drill worksheets from 8H and 8M. I will collect from 8I on Monday. There is no homework this weekend.
March 19, 2018: The students magnetized and demagnetized an iron nail. today. They also worked on research #13. Tomorrow, they will investigate how electric current produces a magnetic field. Their homework tonight is the Magnet HW worksheet.
March 15, 2018: The students completed the iron filings sketches and started their final draft of the magnet/paperclip levitating activity. 8H finished this activity. 8M and 8I will finish this activity on Monday. There is no homework this weekend.
March 14, 2018: The students learned how to find the north pole with a compass and magnet and started to draw magnetic field line illustrations using iron filings and magnets. There is no homework tonight.
March 13, 2018: The students completed two challenges pertaining to characteristics of magnets today. There is no homework tonight.
March 12, 2018: The students presented their tiny houses to 4th and 5th graders today. They did a really great job! They watched a Bill Nye video about magnets for the rest of the class. Tomorrow, they will start learning about properties of magnets. There is no homework tonight.
March 9, 2018: The students finished and presented their electrified tiny houses today! They all did a great job! On Monday I hope for the 8th grade students to share their tiny houses with a younger grade. On Monday the students start a short unit on magnetism.
March 8, 2018: The student worked on their tiny houses today. The last day to complete them is tomorrow.
March 7, 2018: The students took the electricity test today. This test will count for Trimester 3. The students have tomorrow and Friday to work on and complete their tiny house.
March 6, 2018: The students received the correct answers for the electricity test review guide. Their test is tomorrow. This test grade will go on Trimester 3 grading period. Their homework is to study for the test tomorrow. The test review answers are posted below.
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March 5, 2018: The students worked on the Electricity Test review guide activity in class today. They will finish it tomorrow. The test is scheduled for this Wednesday, 3/7.
March 1, 2018: The students continued working on their tiny house electricity project. They will get tomorrow to work on it as well. The students will complete a review activity Monday and Tuesday for the electricity test and will take the test on Wednesday. The students will work on their tiny houses again on Thursday and present them next Friday.
February 28, 2018: The students finished the extension activity today. They will continue working on their tiny houses tomorrow and Friday. An Electricity Test is scheduled for next Wednesday, 3/7. Students will complete a review activity for the test next Monday and Tuesday.
February 27, 2018: The student started an extension activity for their tiny houses: calculating resistance and current in parallel and combination circuits. They will finish the activity tomorrow, then work on their tiny houses. They do not have homework tonight.
February 26, 2018: The students continued working on their Tiny Houses today. I decreased the requirements for the tiny houses. They should be completed by Friday. 8th grade students do not have homework tonight. They need to bring calculators tomorrow, 2/27/18
February 23, 2018: The students continued working on their TIny Houses today. They do not have homework tonight.
February 22, 2018: The students continued working on their Tiny Houses today. They do not have homework tonight.
February 21, 2018: The students continued working on their Tiny Houses today. They turned in their homework from last night. There is no homework tonight.
February 20, 2018: The students started building their Tiny Houses today and began electrifying it. Some groups still need to bring in shoe boxes and supplies for the project. Their homework tonight is 'Electricity Unit HW'.
February 16, 2018: The students completed and turned in the 'Series and Parallel Circuit' Activity from yesterday. I introduced their Tiny LightHouse Project and explained the requirements. They should bring in shoeboxes and craft supplies to build their tiny house.
February 15, 2018: The students constructed and analyzed series and parallel circuits today. There is no homework for tonight. The students will be starting a project tomorrow which they will need shoeboxes for. If you have any shoeboxes, please send them in with your child tomorrow and next week.
February 14, 2018: The students went over their homework from last night and started the homework for tonight. They also watched a few Mr. Wizard's Electricity video. Their homework tonight is 'Ohm's Law Graphing' worksheet.
February 13, 2018: Today the students worked on the four electric circuit activities. The Electricity Maze WS is their homework tonight.
February 12, 2018: Today, the students started to build and analyze electric circuits. They will continue this activity tomorrow. Also, I gave the students information about the Kinetic Sculpture Art Race. If you child would like to participate, meetings are on Wednesdays from 34PM with Mrs. Roper and Mrs. Datz. There is no homework tonight.
February 9, 2018: Today, the students completed an activity about static electricity. This is our introduction activity to our new unit electricity. There is no homework. I collected this assignment from 8H and 8I. I will collect this assignment from 8M on Monday. I also collected their drill worksheets.
February 8, 2018: The students took the forms of energy quiz today. They also completed their energy conversion project. There is no homework.
February 6, 2018: The students completed a review activity for the forms of energy quiz. The answer key is uploaded below. The students will take the quiz the next school day I see them.
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February 2, 2018: I only saw the 8I class today. They worked on their Energy Conversion Project. The Forms of Energy/Conversions Quiz will be on Tuesday. The students will work on a review activity on Monday.
February 1, 2018: The students in 8M and 8H (mostly) completed their writeups for the energy conversion project. Students will get a change next class to finish if they didn't finish in class. The quiz has been moved to Tuesday.
January 31, 2018: 8M and 8H gathered more energy conversion examples, chose one, and started their writeup about it. They do not have homework tonight. The Forms of Energy quiz will need to be rescheduled to the beginning of next week due to schedule changes this week and possible impending inclement weather. The students will complete a review activity before the quiz.
January 30, 2018: The students in 8M and 8H presented their diamante poems about their form of energy. They did a great job! 8I will present tomorrow. A Forms of Energy quiz is scheduled for Friday, Feb. 2nd.
January 29, 2018: The students continued to write their diamante poems for their form of energy. A Forms of Energy Quiz is scheduled for Friday, Feb. 2nd.
January 26, 2018: Students traced energy conversions for 5 common objects. They also started to write a diamanté poem about one specific form of energy. Their homework is the complete the ski trip story on the back of their forms of energy notes.
January 25, 2018: Students started the next unit called forms of energy. They sorted cards into groups, took notes about the 7 forms of energy, then regrouped the cards. There is no homework tonight.
January 1923, 2018: The students should be studying for the science midterm, which is Wednesday, Jan. 24th. The students were emailed a link that takes them directly to the folder on Office365 which contains review activities, answers, and the midterm review guide/answers. The students will need to bring a calculator and their periodic table to the exam.
January 18, 2018: The students completed review activities for the midterm today during class. These activities and answer keys can be found in the OneDrive folder I shared with students through Office365. I also emailed a direct link to this folder to students today. Their homework, from now until next Wednesday, is to review information for the midterm.
January 16, 2018: 8M and 8H had science class today only due to the modified schedule. They played 'snakes and ladders' and used questions from a quizlet I wrote as a review for the chemistry units. My username for quizlet is 'MrsRopersScienceIHM' and the quizlet review set is named 'Science Midterm, January 2018'. My students are encouraged to review using this quizlet.
January 11, 2018: The students wrote a conclusion statement for the marble roller coaster activity today and turned it in. I emailed the students a link to the Midterm Review Answer Key on OneDrive. Students should check their mail for this document. Their homework is to study for the midterm which is scheduled for Wednesday, 1/24.
January 10, 2018: The students completed their three scenarios with the marble roller coaster today. Tomorrow they will write a conclusion statement for the activity. They will also get the answers for the midterm review tomorrow.
January 9, 2018: The students graphed the relationship between potential and kinetic energy today. They also turned in their homework from last night. Their homework, due Thursday, is to complete the Midterm Review Guide.
January 8, 2018: The students received their midterm review guide today. They will get the correct answers on Thursday. They should use their time between now and then to answer the questions in the review guide. Tonight, their homework is Kinetic Energy Practice HW. This worksheet is due tomorrow. In class today, the students continued to calculate the kinetic energy of their marble through three different tracks.
January 5, 2018: There is no homework for the 8th graders this weekend. 8th graders will receive their Science Midterm Review Guide on Monday. They will be expected to answer the questions throughout the week and we will go over the correct answers on Thursday, Jan. 11th.
September 5, 2017: Students should read the science newsletter they got in class today. Welcome back!
September 6, 2017: Students learned how to determine the number of protons, neutrons, and electrons in an atom today. There is no homework.
September 7, 2017: Intro to Atoms HW worksheet, due Friday, 9/8.
September 8, 2017: Students learned how to draw a Bohr Model of an atom today. They will use this method to complete their 'Bohr Person', which is due next Friday, 9/15. They were given requirements for the project today in class. An atom quiz is also scheduled for next Friday.
September 11, 2017: An Atom Quiz is scheduled for Friday, 9/15. Students will take a practice quiz Wednesday or Thursday. Their bohr person project is due on Friday. Students should refer to their element card and the information worksheet that was given to them last Friday.
September 13, 2017: The Bohr Person project is due on Friday. Also, an Atom Quiz is scheduled for Friday. The students will take a practice quiz tomorrow, Thursday.
September 14, 2017: Bohr Person Project is due tomorrow. Students will also take the Atom Quiz tomorrow.
September 15, 2017: The students took their first quiz today. They have no homework this weekend.
September 18, 2017: Identifying Ionic and Covalent Bonds Worksheet
September 19, 2017: Lewis Dot Structure Practice worksheet, due Wednesday, 9/20
September 20, 2017: No homework!
September 22, 2017: No homework! Have a good weekend!
September 25, 2017: No homework tonight, however, an Ionic and Covalent Bonding Quiz is scheduled for next Monday, 10/2.
September 26, 2017: Students started learning about covalent bonds today. Their homework is 'Ionic and Covalent Bonds' color by #, due Wednesday, 9/27.
September 27, 2017: No homework tonight. Ionic and Covalent Bonding quiz is scheduled for Monday, 10./2. Today, students completed an extension activity about double and triple covalent bonds. They will not be testing on these bonds on Monday, just single bonds.
September 28, 2017: Students spent today reviewing for the quiz on Monday. Tomorrow they will review as well. Their homework is to study their notes for the quiz on Monday.
September 29, 2017: Students will take an Ionic and Covalent Bonding Quiz on Monday. Students should study their notes, class activities, reviews, and the practice quiz they took today.
October 2, 2017: Students took the Bonding Quiz today. Tomorrow, they will gather research about properties of groups found in the Periodic Table. There is no homework tonight.
October 3, 2017: Today, students gathered research about groups in the periodic table. Tomorrow, they will complete their research and complete a puzzle activity. There is no homework tonight.
October 4, 2017: Students continued to gather research for groups in the periodic table. Their homework tonight is to complete the back of the 'Patience' worksheet. They got this worksheet on Monday.
October 5, 2017: Their homework tonight is to answer the Periodic Table Puzzle questions.
October 6, 2017: No homework! Students will start learning about chemical and physical changes on Monday.
October 9, 2017: Today, students reviewed physical and chemical changes by combining different chemicals. Students have no homework tonight.
October 10, 2017: Students' homework is Physical and Chemical Changes HW worksheet, due Wednesday, 10/11.
October 11, 2017: Students' homework is to finish the last page of the the "I Saw the Sign" chemical reactions packet. It is the 'Color by #' worksheet.
October 12, 2017: Students collected data today about the Law of Conservation of Mass. There is no homework tonight.
October 13, 2017: Students do not have homework this weekend.
October 16, 2017: There is no homework for students tonight.
October 17, 2017: Homework tonight is Law of Conservation of Mass Thinking Questions.
October 18, 2017: Students were introduced to balancing equations today. A chemical reactions quiz is scheduled for Tuesday, 10/24.
October 19, 2017: The chemical reactions quiz has been rescheduled for Wednesday, 10/25. Students got a Balancing Equations Color by # worksheet today, which is due Monday.
October 20, 2017: Today, students completed and received credit for finishing the Balancing Equations packet. They got a cut and paste balancing equations worksheet which is due Wednesday, 10/25. The Chemical Reactions Quiz is scheduled for 10/25. Students will review for the quiz Monday and Tuesday.
October 23, 2017: Students participated today in a review activity for the quiz on Wednesday. They will finish the review activity tomorrow. Homework tonight is to study for the quiz on Wednesday.
October 24, 2017: Students got the answers for the quiz review today. They are also posted below and in the OneDrive folder. The Chemical Reactions Quiz is tomorrow. The Cut and Past Balancing Equations WS is also due tomorrow.
October 25, 2017: The students took the Chemical Reactions Quiz today. There is no homework.
October 26, 2017: The students learned about exothermic and endothermic reactions today. They will be completing the endo/exo reactions packet tomorrow in class. There is no homework tonight.
October 27, 2017: Students completed their Exo/Endothermic Reactions packet today. They will get points for its completion on Monday. Their homework for the weekend is Endo/Exothermic Reactions WS.
October 31, 2017: The students went over the four factors that affect the rate of chemical reactions. There is no homework tonight. Happy Halloween!
November 1, 2017: Students performed an experiment today by changing the concentration of vinegar with baking soda. Tomorrow, they will answer questions from the experiment and then complete an extension activity. There is no homework tonight.
November 2, 2017: Today in class, students completed the concentration experiment and then started an extension which they will write a conclusion statement for tomorrow. The students' homework tonight is Rates of Reactions Thinking Questions WS.
November 3, 2017: Today students wrote a conclusion paragraph for the vinegar concentration extension. An endothermic/exothermic and factors quiz has been scheduled for Friday, 11/10. Students will complete a review activity for the quiz on Monday.
November 6, 2017: Today, students completed a review guide for the quiz on Friday. We will go over the answers on Wednesday. There is no homework tonight besides studying/preparing for the quiz on Friday.
November 8, 2017: Today, students took notes about elements, compounds, and mixtures. They were able to start the E/C/M station activity. They will most likely complete the rotation activity tomorrow. They will take a practice quiz tomorrow. The endo/exothermic quiz is scheduled for Friday. Their homework for tonight is to identify the nine diagrams on the last page of the packet they got today as elements, compounds, or mixtures.

September 21, 2017: Students are finishing up learning about ionic compounds tomorrow. Next week, they will learn about covalent bonds. There is no homework tonight.

November 9, 2017: Today, students took a practice quiz and continued work on the 12 stations of elements, compounds, and mixtures. Their homework is to study for the quiz tomorrow.
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November 10, 2017: Today, students took the Endo/Exo and Rates Quiz. We will go over the identity of the 12 substances on Monday (Elements, Compounds, and Mixtures packet). Then, students will start the physics unit with Work and Energy.
November 13, 2017: Today, students learned about the scientific definition of work and practiced calculating work. This is the first topic in out physics unit. There is no homework tonight.
November 14, 2017: Today, students learned how to use conversion factors to turn numbers into a 'meters' unit of measurement so they can use the work formula. Their homework tonight is 'Calculating Work' worksheet. The math rotations students started today are on OneDrive. The students will finish the rotations tomorrow. A Work Quiz is scheduled for next Tuesday. This will be the last quiz for Trimester 1.
November 15, 2017: Students continued to work on or finish the Work Math Stations problems. Tomorrow they will get about 10 minutes to finish them. The students are also working on designing an experiment for work. There is no homework tonight.
November 16, 2017: The students continued work on their work experiment in class today. The Work Math Stations are in a powerpoint in the OneDrive folder I shared with them through Office365. They will finish the experiment tomorrow. Work quiz is Tuesday, 11/21.
November 17, 2017: Students continued work on their lab report today. Their homework for the weekend is Calculating Work #2. They will take a practice quiz on Monday and the Work Quiz on Tuesday.
November 20, 2017: Students took a Work Practice Quiz today. They also have the correct answers for the Calculating Work #2 HW. The Work Quiz is tomorrow. The Work Quiz along with the Work Lab Report and Drill Worksheet ending 11/22 will be the last two grades for Trimester 1.
November 21, 2017: The students took the Work Quiz today. This quiz, along with the drill worksheet collected this week and their Work Lab Report, are the last grades for Trimester 1. There is no homework tonight.
November 27, 2017: Today, students calculated power problems and gathered data in a power lab. The students will finish the lab tomorrow and start power practice problems. The Work Lab Report is due tomorrow, Tuesday, 11/28.
November 28, 2017: Work Lab Reports are due today. Students need to share them with me through Office365 or email.
November 29, 2017: The students continued to solve the power calculations in class today. There is not homework tonight.
November 30, 2017: The students worked on Work and Power practice problems. They did have a substitute teacher today. There is no homework.
December 1, 2017: The students continued to answer the 15 Power Math Problems rotation. The students will have about 10 minutes on Monday to complete the math problems. If they would like to complete them over the weekend, the Power Problems are in the folder I shared with students on OneDrive through Office365. There is no homework for the weekend.
December 4, 2017: The students learned about potential energy and solved gravitational potential energy math problems today. They began collecting data for a GPE experiment. If students need about 10 minutes to finish the power problems, they will get that 10 minutes tomorrow. Otherwise, the problems are in the OneDrive folder I shared with students through Office365. There is no homework tonight.
December 5, 2017: GPE HW worksheet is tonight's homework.
December 6, 2017: Today, students collected data for their marble/cup GPE experiment. Tomorrow they will start constructing their experiment posters. There is no homework tonight.
December 7, 2017: The students continued to work on their GPE experiments. Their homework tonight is 'GPE HW #2', due Friday, 12/8.
December 8, 2017: Only the 8I group had science today due to the awards assembly, Mass, and christmas presnts wrapping. The 8I group were able to work on their posters. Their homework that was originally due today (GPE HW #2) will be due Tuesday, 12/12.
December 12, 2017: 8th grade students worked on their experiment posters today. I am hoping they will finish the posters tomorrow and present them on Thursday. A GPE quiz has been scheduled for Monday, 12/18/17.
December 13, 2017: Today, 8H and 8M finished their GPE posters and will present them tomorrow. 8I will present their posters today. All classes HW is to answer GPE HW #3, due tomorrow.
December 14, 2017: 8M and 8H presented their GPE posters today. They will take the GPE practice quiz tomorrow and the real quiz on Monday.
December 15, 2017: Students took a GPE practice quiz today during class. The answer key can be found on OneDrive and below. The real GPE Quiz will be on Monday.
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December 18, 2017: The students took the GPE Quiz today and continued work on their egg drop entry. There is no homework tonight.
December 19, 2017: The students continued to build their egg drop contraption. They do not have homework tonight.
December 20, 2017: The students dropped their egg contraptions today! They did a really good job! To celebrate, Mr. Alicea bought them egg drop soup for lunch! Out of 10 egg drops, only two eggs broke. Congratulations to the winners! There is no homework until January. Have a great and relaxing Christmas break!
January 2, 2018: The students started kinetic energy today with practice calculations and setting up their marble roller coasters. There is no homework tonight.
January 3, 2018: The students continued work on building their marble roller coasters today to calculate the kinetic energy of their marble. There is no homework tonight.