Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter

Forces, Movement, Shape, and Momentum

173 practice questions

Start practising (87 questions)

Topics covered

Practice questions

61–70 of 87 · Normal

Question 61
3 marks · Normal
A book rests on a table. The weight of the book is 7 N.
(a)
Identify the action force and the reaction force acting on the book and table.
[2 marks]
(b)
State the direction of each force.
[1 mark]
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Question 62
3 marks · Normal
When a swimmer pushes water backwards with her hands while swimming, she moves forwards.
(a)
Explain, using Newton's third law, how the swimmer is able to move forward through the water. Include a clear identification of the pairs of forces involved.
[3 marks]
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Question 63
2 marks · Normal
State Newton’s third law of motion.
(a)
Write out the standard statement used in your course.
[2 marks]
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Question 64
4 marks · Normal
The diagram below shows a person (A) in a small rowboat pushing another person (B) in a second rowboat. Both boats are initially at rest.
Two boats on a lake. A (on left) is pushing B (on right).
(a)
Describe what happens to both A and B when A pushes B's boat away. Refer to the forces involved.
[2 marks]
(b)
Explain how this demonstrates Newton’s third law. Name the action and reaction forces.
[2 marks]
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Question 65
2 marks · Normal
A person jumps off a small boat onto a pier. As she jumps forward, the boat moves backwards. Explain why the boat moves backwards using Newton's third law.
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Question 66
4 marks · Normal
In a game of tug-of-war, two teams pull on opposite ends of a rope. Both teams seem to pull with all their strength, but neither team is moving.
(a)
Explain, using Newton’s third law, why neither team moves even though both are pulling hard.
[2 marks]
(b)
Describe the action and reaction forces between one team and the rope.
[2 marks]
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Question 67
1 mark · Normal
A person hits a nail into a piece of wood with a hammer. According to Newton’s third law, what is the force exerted by the nail on the hammer?
1. A.The nail exerts a greater force than the hammer.
2. B.The nail exerts an equal force to the hammer but in the opposite direction.
3. C.The nail does not exert any force on the hammer.
4. D.The nail exerts a smaller force because it is lighter.
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Question 68
3 marks · Normal
A student places a block on a spring scale (newton meter) hanging from a clamp stand. The block hangs at rest.
(a)
State the action and the reaction force involved between the block and the spring scale.
[2 marks]
(b)
Explain, using Newton's third law, why the reading on the scale does not change while the block is hanging and at rest.
[1 mark]
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Question 69
4 marks · Normal
A person tries to open a heavy gate by applying a force of 120 N perpendicular to the gate, 0.75 m from the hinge. Another person tries to keep the gate closed by pushing with a force of 180 N, but only 0.3 m from the hinge.
(a)
Calculate the moment produced by the first person about the hinge.
[1 mark]
(b)
Calculate the moment produced by the second person about the hinge.
[1 mark]
(c)
State which person has a greater turning effect on the gate and explain your answer.
[2 marks]
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Question 70
4 marks · Normal
The diagram shows a uniform beam of length 2.0 m and negligible mass balanced on two supports, A and B, at either end. A box of mass 20 kg is placed 0.5 m from support A.
Beam with supports and load
(a)
Draw a force diagram showing the forces acting on the beam.
[1 mark]
(b)
Taking moments about support A, calculate the upward force on support B due to the box only. (Take g = 10 N/kg.)
[2 marks]
(c)
State and explain how the upward forces at supports A and B would change if the box is moved closer to support B.
[1 mark]
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