Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Forces and Motion
367 practice questions
Topics covered
Practice questions
131–140 of 181 · Normal
Question 131
4 marks · Normal
Answer and see the solution →A supply crate of mass 75 kg is dropped by parachute onto a remote island. The gravitational field strength is 9.8 N/kg.
(a)[2 marks]Calculate the weight of the crate.
(b)[2 marks]The parachute opens and the crate reaches a terminal velocity of 5 m/s. State what this tells you about the forces acting on the crate as it descends at this speed.
Question 132
4 marks · Normal
Answer and see the solution →A student investigates how the surface area of paper cones affects their terminal velocity. She drops cones of identical mass but different surface areas from the same height and records their terminal velocities.
Results Cone Surface Area (cm^2) Terminal Velocity (m/s) 25 3.8 35 3.1 45 2.6 Question 133
4 marks · Normal
Answer and see the solution →Explain how terminal velocity is reached by a falling object. In your answer, refer to what happens to the forces acting on the object during its fall.
Question 134
4 marks · Normal
Answer and see the solution →A toy parachute is dropped from a tall building.
(a)[2 marks]Draw and label all the forces acting on the parachute immediately after it is released.
(b)[2 marks]Describe how the size of each force changes as the parachute falls and eventually reaches terminal velocity.
Question 135
2 marks · Normal
Answer and see the solution →A suitcase has a mass of 12 kg. Calculate its weight on Earth. Use g = 9.8 N/kg.
Question 136
3 marks · Normal
Answer and see the solution →A basketball is dropped from a tall stand. Explain, with reasons, why the basketball accelerates at first but later falls at a constant speed. Refer to the forces acting on the ball at each stage.
Question 137
3 marks · Normal
Answer and see the solution →A van of mass 1800 kg is moving at a velocity of 15 m/s. Calculate its momentum.
Question 138
4 marks · Normal
Answer and see the solution →A 0.5 kg football is kicked so that it moves with a velocity of 8 m/s towards a goal.
(a)[2 marks]Calculate the momentum of the football.
(b)[2 marks]If the football comes to rest in 0.4 s when caught by the goalkeeper, calculate the average force applied by the goalkeeper to stop it.
Question 139
3 marks · Normal
Answer and see the solution →Explain how crumple zones in cars help to reduce injuries to passengers during a collision, using ideas about momentum.
Question 140
1 mark · Normal
Answer and check →Which of these best explains why airbags increase safety in cars during a crash?
- A.They increase the force needed to stop the passenger.
- B.They decrease the change in momentum during a crash.
- C.They increase the time taken to stop the passenger.
- D.They make the passenger bounce away from the dashboard.