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P4

OCR Physics module P7

QuestionAnswer
Ben uses a parachute to fall to the ground at a safe steady speed. Discuss the energy transfers which allow Ben and his parachute to drop at a steady speed.
A car with a mass of 800kg travels at a speed of 15m/s on level ground. Calculate the braking force in Newtons needed to stop the car in 2 seconds.
Jill throws a ball into the air. She catches it when it comes down again. When Jill catches the ball, she allows her hand to move down with the ball. Explain what effect this action has on the impact force of the ball on her hand.
Explain why it is easy to start walking across grass but difficult to start walking across ice.
Created by: khakhria
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