DOL Newton's Third Law 11-7-24

1. Force always come in________

• waves
• triplets
• pairs

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NGSS.MS-PS2-1

2. Your friend pushes you for making fun of him/her. What is the reaction force?

• You pushing back on your friend
• You pushing on the ground
• There is no reaction force
• Your friend pushing on the ground

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NGSS.MS-PS2-1

3. Which statement best describes an action–reaction force pair in this situation?

• The wheels slow down, and the skater stops.
• The skater exerts a force on the wall, and the wheels exert a force on the floor and begin to turn.
• The wall pushes on the skater when the skater pushes on the wall.
• The friction of the floor decreases when the wheels roll on the floor.

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NGSS.MS-PS2-1

4. A pitcher throws a 2 kg ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10-newton force to the ball. Assuming that there are no other external forces acting, how much force does the ball apply to the bat?

• The ball applies a 2 N force to the bat.
• The ball applies a 5 N force to the bat.
• The ball applies a 10 N force to the bat.
• The ball applies a 20 N force to the bat.

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NGSS.MS-PS2-1

5. Part A Mr. Garza is seated in the driver seat of a car with the seat belt on. The car suddenly stops and he moves forwards until the seat belt stops him. Identify two different action - reaction pairs in this situation.

• Mr. Garza moving forward and the car moving backward.
• Mr. Garza moving forward and the seat belt exerting a backward force on him.
• The car moving forward and the car's tires gripping the road.
• Mr. Garza moving forward and the steering wheel turning.

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NGSS.MS-PS2-1

Part B Verify that they are a true opposite action - reaction. There is several explanations of this situation showing action-reaction pairs. A few are in the feedback to compare to your answer after submitted.

Answer explanation

Seatbelt - Garza , Mr. Garza to Seatbelt
Mr. Garza - Car seat , Car seat - Mr. Garza
Car - Mr. Garza , Mr. Garza - Car
Wheels - Car , Car - wheels
Brakes - wheels, wheels - brakes

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NGSS.MS-PS2-1