Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Forces and Motion
367 practice questions
Topics covered
Practice questions
291–300 of 367
Question 291
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.
Question 292
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 293
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 294
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 295
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.
Question 296
3 marks · Normal
Answer and see the solution →A cyclist and their bicycle have a combined mass of 90 kg. If their velocity changes from 6 m/s to 0 m/s in 2 seconds, calculate the average resultant force acting on them while stopping.
Question 297
4 marks · Normal
Answer and see the solution →A trolley of mass 2 kg is moving at 3 m/s towards a stationary trolley of mass 1 kg. They collide and stick together.
(a)[2 marks]Calculate the total momentum before the collision.
(b)[2 marks]Calculate the velocity of the joined trolleys after the collision.
Question 298
3 marks · Normal
Answer and see the solution →Describe and explain what happens to the momentum of two ice skaters who push off from one another on frictionless ice. Use the principle of conservation of momentum.
Question 299
3 marks · Normal
Answer and see the solution →The following table shows the mass and velocity of three objects moving in a straight line:
Object Mass (kg) Velocity (m/s) A 2.0 4.0 B 1.5 6.0 C 5.0 1.0 (a)[3 marks]Calculate the momentum of each object and complete the table below.
Question 300
1 mark · Normal
Answer and see the solution →Which statement best describes how seat belts improve passenger safety in a car crash, using ideas about momentum?
- A.They increase the force acting on the passengers.
- B.They make the change in momentum larger.
- C.They increase the time over which momentum changes, reducing the force.
- D.They prevent the car from stopping suddenly.