Action Reaction Forces Fun
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Action Reaction Forces Fun
The science idea
Newton’s third law says that when one object pushes or pulls another object, the second object pushes or pulls back with an equal-sized force in the opposite direction. These two forces act at the same time on different objects. For example, when a swimmer pushes water backwards, the water pushes the swimmer forwards.
Challenge 1: Follow the force pairs
Use the science note and the information in each question to answer the challenges. For question 1, the balloon moves to the right as air escapes.
- In the same direction as the balloon’s motion
- In the opposite direction to the balloon’s motion
- Straight upwards
- A. A swimmer pushes water backwards.
- B. A foot pushes down on the ground.
- C. A hand pushes on a wall.
- 2. The water pushes the swimmer forwards.
- 1. The ground pushes the foot upwards.
- 3. The wall pushes back on the hand.
Challenge 2: Explain what happens
Think carefully about which object receives each force. A force pair does not cancel out because its forces act on different objects.
- Downwards
- Upwards
- Sideways
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