1. A car accelerates along a road. Identify the force that moves the car.
2. Identify the action and reaction forces for the case of an object in free fall (no air resistance).
Question 3.S&C.6: 1. A car accelerates along a road. Identify the force that m...
1. It is the road that pushes the car along. Really! Except for air resistance, only the road provides a horizontal force on the car. How does it do this? The rotating tires of the car push back on the road (action). The road simultaneously pushes forward on the tires (reaction). How about that!
2. To identify a pair of action–reaction forces in any situation, first identify the pair of interacting objects. In this case Earth interacts with the falling object via the force of gravity. So Earth pulls the falling object downward (call it action). Then reaction is the falling object pulling Earth upward. It is only because of Earth’s enormous mass that you don’t notice its upward acceleration.
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