Moments. Question Paper. Save My Exams! The Home of Revision. Exam Board. Page 1. Score: /67. Percentage: /100
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1 Moments Question Paper Level Subject Exam Board Unit Topic Difficulty Level Booklet GCSE Physics AQA P3 Moments Gold Level Question Paper Time Allowed: 67 minutes Score: /67 Percentage: /100 Page 1
2 Q1.The diagram shows a man standing in an airport queue with his wheeled bag. (a) The man applies an upward force to the handle of his bag to stop the bag from falling. The moment of this force about the pivot is 36 Nm. Calculate the upward force the man applies to the handle of his bag. Use the correct equation from the Physics Equations Sheet. Force =... N (b) When the man lets go of the bag handle, the bag falls and hits the floor. Page 2 Explain why.
3 (c) During his holiday the man visits the Foucault Pendulum in Paris, France. The pendulum makes 10 complete swings every 160 seconds. Calculate the frequency of the pendulum and give the unit. Use the correct equation from the Physics Equations Sheet. Frequency =... (3) (Total 7 marks) Q2.The diagram shows a design for a crane. The crane is controlled by a computer. Page 3
4 The purpose of the motors and gears is to change the pulling force in the steel cable. This is done so that the jib stays horizontal whatever the size of the load or the position of the load. Use the equation in the box to answer questions (a) and (b). moment = force x perpendicular distance from the line of action of the force to the axis of rotation (a) Calculate the moment caused by the load in the position shown in the diagram. Show clearly how you work out your answer and give the unit. Moment =... (3) (b) Calculate the pulling force that is needed in the steel cable to keep the jib horizontal. Show clearly how you work out your answer. Page 4
5 Pulling force =... N (Total 5 marks) Q3.The diagram shows a father and his two children sitting on a playground see-saw. The see-saw is not moving. (a) What is the total clockwise moment of the two children about the axis of rotation? Explain the reason for your answer. (3) Page 5
6 (b) (i) What is the clockwise moment of the boy, B, about the axis of rotation? Moment =... Nm (1) (ii) Use the information in the diagram and the equation in the box to calculate the weight, W, of the boy, B. moment = force perpendicular distance from the line of action of the force to the axis of rotation Show clearly how you work out your answer. Weight of boy B =... N (Total 6 marks) Q4.The diagram shows a device called a current balance. Page 6
7 (a) (i) When the switch is closed, the part of the wire labelled XY moves upwards. Explain why. (ii) What is the name of the effect that causes the wire XY to move? (1) (iii) An alternating current (a.c.) is a current which reverses direction. How many times the current reverses direction in one second depends on the frequency of the alternating supply. Describe the effect on the wire XY if the battery is replaced by an a.c. supply having a frequency of 5 hertz. Page 7
8 (b) The diagram shows how a small weight can be used to make the wire XY balance horizontally. Use the data in the diagram and the equation in the box to calculate the force, F, acting on the wire XY. moment = force perpendicular distance from the line of action of the force to the axis of rotation Show clearly how you work out your answer. Force =... N (3) (Total 8 marks) Q5. The diagram shows a fork-lift truck with a load of 2.4 kn. The clockwise moment caused by this load is 2880 Nm. Page 8
9 (a) Use the equation in the box to calculate the distance d. moment = force perpendicular distance from the line of action of the force to the axis of rotation Show clearly how you work out the answer and give the unit. Distance d =... (3) (b) This warning notice is in the driver s cab. Explain in terms of moments why the maximum load must not be exceeded. Page 9
10 (Total 5 marks) Q6. The diagram shows a back view of a computer monitor. (a) In normal use, the monitor is stable. (i) Explain the meaning, in the above sentence, of the word stable. (ii) State the relationship between the total clockwise moment and the total anticlockwise moment about any axis of the monitor when it is stable. Page 10
11 (1) (b) The instruction booklet explains that the screen can be tilted. It also includes a warning. Caution The monitor can tip over if the screen is tilted too far back. Explain why the monitor will tip over if the screen is tilted too far back. Include the words centre of mass, weight and moment in your explanation. (3) (Total 6 marks) Page 11
12 Q7. The diagrams show two concrete mixers. Concrete mixer A Concrete mixer B On each diagram, the centre of the white X marks the centre of mass of the concrete mixer and its contents. (a) Complete the sentence to explain what the term centre of mass means. The centre of mass of a concrete mixer and its contents is... (1) (b) Both diagrams are drawn to the same scale. Concrete mixer B is more stable than concrete mixer A. The two features which make concrete mixer B more stable are: Page 12
13 (c) Use the terms line of action of the weight and resultant moment to explain why a stable concrete mixer does not fall over when it is given a small push. (Total 5 marks) Q8. The diagram shows a design for a crane. The crane is controlled by a computer. Page 13
14 The purpose of the motors and gears is to change the pulling force in the steel cable. This is done so that the jib stays horizontal whatever the size of the load or the position of the load. Use the equation in the box to answer questions (a) and b). moment = forc e perpendicular distance from the line of action of the force to the axis of rotation (a) Calculate the moment caused by the load in the position shown in the diagram. Show clearly how you work out your answer and give the unit. Moment =... (3) Page 14
15 (b) Calculate the pulling force that is needed in the steel cable to keep the jib horizontal. Show clearly how you work out your answer. Pulling force =... N (Total 5 marks) Q9. Tractors are often used on sloping fields, so stability is important in their design. On the diagram, the centre of the X marks the centre of mass of the tractor. (a) What is meant by the term centre of mass? (1) Page 15
16 (b) Explain how the design of the tractor could be changed in order to increase the tractor s stability. (c) Explain why the tractor does not topple over. You may add to the diagram to help your explanation. (3) (Total 6 marks) Q10. A student wants to weigh himself but the only balance available is a newtonmeter that measures up to 200 newtons. The diagram shows how the student solved the problem using moments. Page 16
17 (a) Use the information in the diagram to calculate the weight of the student given by this method. Write down the equation you use, and then show clearly how you work out your answer and give the unit. Weight =... (5) (c) Even though all the measurements are accurate the student s weight obtained by this method is inaccurate. Page 17
18 Explain why. (Total 7 marks) Q11. Tractors are often used on sloping fields, so stability is important in their design. On the diagram, the centre of the X marks the centre of mass of the tractor. (a) Explain why the tractor has not toppled over. You may add to the diagram to help you to explain Page 18
19 (3) (b) Give two features of the tractor which affect its stability and state how each feature could be changed to increase the tractor s stability. Feature Feature (Total 5 marks) Q12. The diagram shows a spanner being used to undo a tight nut. The nut was tightened using a moment of 120 newton metres. Use the following equation to calculate the force needed to undo the nut. Show clearly how you work out your answer. moment = force perpendicular distance from pivot Page 19
20 Force =... N (Total 2 marks) Page 20
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