Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Energy Resources and Energy Transfers
175 practice questions
Topics covered
Practice questions
21–30 of 90 · Normal
Question 21
2 marks · Normal
Answer and see the solution →State and explain the relationship between the work done on an object and the energy transferred to that object.
Question 22
1 mark · Normal
Answer and check →A student drags a sled across the playground applying a force of 60 N for 4.0 m. What is the work done by the student?
- A.15 J
- B.240 J
- C.64 J
- D.24 J
Question 23
1 mark · Normal
Answer and see the solution →What is the unit of work done in the SI system?
Question 24
3 marks · Normal
Answer and see the solution →Figure 1 shows a girl pulling a suitcase with a force of 30 N over a horizontal distance of 8 m on a smooth airport floor.
(a)[2 marks]Calculate the total work done by the girl on the suitcase.
(b)[1 mark]What is the energy transferred to the suitcase?
Question 25
2 marks · Normal
Answer and see the solution →Explain why no work is done when a person tries to push a wall but the wall does not move.
Question 26
4 marks · Normal
Answer and see the solution →A man pulls a cart in a straight line by applying a constant horizontal force of 120 N. The cart moves 5.0 m in the direction of the force.
(a)[2 marks]Calculate the work done on the cart.
(b)[1 mark]State the amount of energy transferred to the cart.
(c)[1 mark]Explain what would happen to the work done if the force applied was doubled but the distance stayed the same.
Question 27
3 marks · Normal
Answer and see the solution →A tennis ball of mass 0.060 kg is thrown horizontally at a speed of 18 m/s.
(a)[3 marks]Calculate the kinetic energy of the ball.
Question 28
4 marks · Normal
Answer and see the solution →A car of mass 1100 kg is travelling at 20 m/s on a motorway.
(a)[2 marks]Calculate the kinetic energy of the car.
(b)[2 marks]Explain what happens to this energy if the car brakes to a stop.
Question 29
3 marks · Normal
Answer and see the solution →A football of mass 0.45 kg is moving at 12 m/s towards a goal.
(a)[3 marks]Calculate its kinetic energy.
Question 30
4 marks · Normal
Answer and see the solution →A student drops a metal ball bearing (mass 0.15 kg) from rest at a height of 2.5 m above the ground. Ignore air resistance.
(a)[2 marks]Calculate the gravitational potential energy of the ball bearing at the top.
(b)[1 mark]State the value of kinetic energy just before the ball hits the ground.
(c)[1 mark]Explain your reasoning.