Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Forces and Motion
367 practice questions
Topics covered
Practice questions
301–310 of 367
Question 301
5 marks · Hard
Answer and see the solution →Two identical trolleys, A and B, each of mass 1.2 kg, move along a smooth, straight track. Trolley A is moving at 1.6 m/s towards stationary trolley B. The trolleys collide and stick together.
(a)[2 marks]Calculate the total momentum of the two trolleys before the collision.
(b)[2 marks]Calculate the velocity of the combined trolleys immediately after the collision.
(c)[1 mark]Explain why the principle of conservation of momentum can be applied in this situation.
Question 302
5 marks · Hard
Answer and see the solution →A 1500 kg car is moving at 12 m/s along a straight road. The driver presses the brakes and brings the car to a complete stop in 2.8 s.
(a)[2 marks]Calculate the change in momentum of the car.
(b)[2 marks]Calculate the average braking force exerted on the car.
(c)[1 mark]Explain in physics terms why increasing the stopping time would affect the force experienced by the car.
Question 303
5 marks · Hard
Answer and see the solution →A fireworks shell of mass 0.75 kg is initially at rest. It explodes in mid-air into two fragments: fragment X (0.45 kg) flies west at 16 m/s and fragment Y (unknown mass) flies east.
(a)[1 mark]Calculate the mass of fragment Y produced in the explosion.
(b)[3 marks]Calculate the velocity of fragment Y after the explosion.
(c)[1 mark]Explain why fragment Y moves in the opposite direction to fragment X.
Question 304
2 marks · Easy
Answer and see the solution →A man stands on the ground and pulls a rope that is attached to a heavy box. According to Newton's third law, what force acts on the man while he is pulling the rope? State both the direction and the object applying the force.
Question 305
2 marks · Easy
Answer and see the solution →When a rubber ball bounces against a hard wall, explain, using Newton’s third law, why the ball bounces back.
Question 306
2 marks · Easy
Answer and see the solution →Two ice skaters push against each other and move apart on a frozen lake. Using Newton’s third law, state how the forces on each skater compare. State the direction of each force.
Question 307
2 marks · Easy
Answer and see the solution →When a fish swims by pushing water backwards with its fins, it moves forward. Use Newton's third law to explain why the fish moves forward.
Question 308
1 mark · Easy
Answer and see the solution →A cat jumps down from a chair to the floor. According to Newton’s third law, what does the floor do to the cat as it lands?
Question 309
2 marks · Easy
Answer and see the solution →A student uses a broom to push a box across the floor. Use Newton's third law to explain what happens to the broom and the box as the broom applies a force.
Question 310
1 mark · Easy
Answer and check →Which of the following best describes Newton's third law?
- A.For every action there is an equal and opposite reaction.
- B.An object remains at rest unless acted on by a resultant force.
- C.The larger the mass, the larger the force needed to accelerate it.
- D.The total momentum of a system is conserved.