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3: Newton’s Third Law of Motion
Day 1:Warm Up: Write something fun you did this weekend!
LT: I can explain Newton’s Third Law of Motion
Newton’s Cradle
THINK independently and then DISCUSS with your group
1. What is happening?2. Why is this happening?3. What forces are working?
Newton’s Third LawFor every action, there is an equal and opposite reaction.
https://www.youtube.com/watch?v=MUgFT1hRTE4
Action Force
- Initiating force (first force)- Causes the reaction force
Ex1 : baseball hitting bat (action),
Ex2: Gymnast jumping off beam
FORCES ALWAYS COME IN PAIRS!
Reaction Force- Reacting force (second force)- Responds to the action force
Ex1 : bat applying force on ball after the ball hits it
Ex2: Beam exerting force on gymnast
FORCES ALWAYS COME IN PAIRS! THERE IS ALWAYS A REACTION FORCE EVEN IF IT ISN’T OBVIOUS
Which is the action and reaction force?
Bowling ball pushing over pin - Action
Pin pushing bowling ball - reaction
Ball pushes glove - action
Glove pushes ball - reaction
Which is the action and reaction force?
Answer: 1. Foot A - action, Ball - reaction2. Foot C - action, Ball - reaction
Identify at least 6 pairs of action-reaction pairs in the following diagram:
Action - Reaction Pairs WS
Football Physics: Newton’s Third Law
Football physics: https://www.youtube.com/watch?v=e1lzB36aHD4
Day 2:Warm Up: What is Newton’s Third Law of Motion
LT: I can explain Newton’s Third Law of Motion and give examples of action-reaction pairs.
Review: Newton’s Third Law
For every action, there is an equal and opposite reaction.
Go over Action - Reaction WS HW and Turn In
Investigate car crashes
http://www.discovery.com/tv-shows/mythbusters/videos/crash-force-high-speed/
Car Crash mythbusters: https://www.youtube.com/watch?v=r8E5dUnLmh4
Work with your group to choose one example (check in with Ms. P once you have picked), EXPLAIN and MODEL how your chosen example shows Newton’s Third Law (use white board!)1. Skier crashing into a tree2. Meteorite hitting earth’s surface3. Volleyball player hitting volleyball4. A bee stinging your arm5. A dog catching a frisbee6. An eagle catching a fish7. A basketball player shooting a basketball8. A jet taking off from the runway9. A flying squirrel landing on a tree branch
10. A motorcycle crash
Newton’s 3rd Law WS
Day 3: Car Crashes + Test Review + Egg Drop
Warm Up: Write an example of an action-reaction pair and Newton’s Third Law of Motion.
LT: I can use Newton’s Three laws to explain why the bobsled crashed.
Final Bobsled revision
Physics of a bobsled: https://www.youtube.com/watch?v=UGbOP79EhT0
1. Revise your bobsled model2. Write a CER about WHY the bobsled
crashed
Newton’s Laws in SPACE!
https://www.youtube.com/watch?time_continue=4&v=KvPF0cQUW7s
TEST REVIEW
- Friction WS- Which Law WS- Physics in Neighborhood WS
ALL THREE are DUE March 14
Newton’s Laws of Motion TEST March 15
Concepts to know for Newton’s Laws Test: Study Note Packet!
- Who Sir Isaac Newton was- Newton’s Three Laws of Motion - what they are and how they work- All the equations we have used - Speed, distance, time- Velocity- Acceleration- Force- Gravity- Friction- Mass- Action Force- Reaction Force
Project: Egg Drop
Task: Design a container and parachute to carry a raw egg to ground when dropped from 15 ft.
Goal: Slowest time and safest landing
Requirements: Work with your team, use only acceptable materials, container must fit in backpack
Project: Egg Drop
Materials: see list on instructions, any other materials must be approved by Ms. P...BRING YOUR MATERIALS WITH YOU TO CLASS
Ms. P will provide egg on the day of the drop (March 13)
Due Dates: Egg drop: March 13, Write up due: March 14
Day 4-5: Egg Drop Work Days
Warm Up: What are some of the requirements for the egg drop project?
LT: I can work with a group to design a capsule that protects an egg from breaking when it’s dropped.
Project: Egg Drop
Task: Design a container and parachute to carry a raw egg to ground when dropped from 15 ft.
Goal: Slowest time and safest landing
Requirements: Work with your team, use only acceptable materials, container must fit in backpack
Project: Egg Drop
Materials: see list on instructions, any other materials must be approved by Ms. P...BRING YOUR MATERIALS WITH YOU TO CLASS
Ms. P will provide egg on the day of the drop (March 13)
Due Dates: Egg drop: March 13, Write up due: March 14
Day 6: Egg Drop Test
LT: I can test my egg drop capsule.
Egg Drop Test Instructions
Day 7: Review Day
LT: I can review for the unit test.
Review Day
Day 8: Newton’s Laws Test
