Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Forces and Motion
367 practice questions
Topics covered
Practice questions
111–120 of 145 · Easy
Question 111
3 marks · Easy
Answer and see the solution →A tennis ball is dropped from a balcony. It falls straight down through the air.
(a)[1 mark]State the two forces acting on the tennis ball as it falls.
(b)[1 mark]As the ball falls faster, describe what happens to the size of the air resistance.
(c)[1 mark]Eventually the ball falls at a constant speed. What is the name of this constant speed?
Question 112
3 marks · Easy
Answer and see the solution →A cyclist is moving quickly down a hill and eventually reaches a speed where her speed does not increase any further, even though she is still going downhill.
Explain why the cyclist does not keep speeding up. In your answer, refer to the forces acting on the cyclist.
Question 113
1 mark · Easy
Answer and see the solution →A tennis ball has a mass of 0.06 kg. It is moving with a velocity of 10 m/s. Calculate the momentum of the tennis ball.
Question 114
1 mark · Easy
Answer and check →Which quantity must be changed if you want to increase the momentum of an object without changing its velocity?
- A.Its mass
- B.Its shape
- C.Its speed
- D.Its position
Question 115
1 mark · Easy
Answer and see the solution →State the law of conservation of momentum.
Question 116
2 marks · Easy
Answer and see the solution →Explain why a rocket moves forward when burning fuel, even in the vacuum of space.
Question 117
2 marks · Easy
Answer and see the solution →A sprinter of mass 70 kg is running at a velocity of 8 m/s. She slows down to a stop in 4 seconds. Calculate her change in momentum and the average force needed to stop her.
Question 118
2 marks · Easy
Answer and see the solution →(a)[1 mark]State the equation linking force, change in momentum, and time.
(b)[1 mark]Give the SI unit of momentum.
Question 119
2 marks · Easy
Answer and see the solution →(a)[1 mark]A small skateboard of mass 2 kg is at rest. A person jumps onto it, giving the skateboard a velocity of 3 m/s. Calculate the momentum of the skateboard after the jump.
(b)[1 mark]If the person and skateboard have a combined mass of 40 kg and move off together at 2 m/s after the jump, what is their total momentum?
Question 120
2 marks · Easy
Answer and see the solution →Explain, using physics ideas about momentum, why soft sand at the end of an escape lane reduces the force on a lorry during an emergency stop.