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1.4 Moments
Question Paper
Course
Edexcel IGCSE Physics
Section
1. Forces & Motion
Topic
1.4 Moments
Difficulty
Medium
Time allowed:
40
Score:
/28
Percentage:
/100
Page 1 of 9
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Question 1a
Photograph C shows how a student can use a claw hammer to pull a nail from a piece of wood.
(a)
The mass of the hammer is 0.454 kg.
(i)
Calculate the weight of the hammer.
(2)
weight = ............................................... N
(ii)
From what point does this weight act?
(1)
[3 marks]
Page 2 of 9
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Question 1b
(b)
Photograph D shows the directions of two other forces on the hammer.
(i)
Draw an arrow on photograph D to show the force on the nail from the hammer.
(ii)
Suggest two ways that the student could increase the moment on the hammer.
(2)
(2)
[4 marks]
Page 3 of 9
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Question 2a
A man uses a wheelbarrow to carry some logs along a flat path, as shown.
He pushes with a horizontal force of 140 N and the wheelbarrow moves 39 m.
The man stops and holds the wheelbarrow horizontally, as shown.
The man exerts a total upward force of FN. The weight of the loaded wheelbarrow is 470N.
(a)
Mark X on the diagram to indicate the centre of gravity of the loaded wheelbarrow.
(1)
[1 mark]
Page 4 of 9
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Question 2b
(b)
(i)
State the equation linking moment, force and perpendicular distance from the pivot.
(ii)
Calculate the force F.
(1)
(4)
[5 marks]
Page 5 of 9
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Question 3a
The diagram shows the apparatus used to investigate moments.
The 2 N weight is placed 60 cm from the pivot.
The newtonmeter is placed 10 cm from the pivot.
(a)
(i)
State the equation linking moment, force and perpendicular distance from the pivot.
(1)
(ii)
Calculate the reading on the newtonmeter.
Ignore the weight of the ruler.
(3)
reading = ............................................... N
[4 marks]
Page 6 of 9
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Question 3b
(b)
The metre rule is replaced by an iron bar.
The iron bar is 1 m long and has a weight of 10 N.
The newtonmeter and the 2 N weight stay in their original position.
Explain how this change affects the reading on the newtonmeter.
(3)
[3 marks]
Page 7 of 9
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Question 4a
(a)
A painter sets up a uniform plank so he can paint a wall.
The plank is 3 m long and weighs 500 N.
(i)
Use the principle of moments to show that the upward force A is 250 N.
(ii)
State the value of force B.
(4)
(1)
force B = ............................N
[5 marks]
Page 8 of 9
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Question 4b
(b)
The painter stands on the plank as shown.
(i)
Draw an arrow on the diagram to show the weight of the painter.
(ii)
Describe the changes in forces A and B when the painter stands on the plank.
(1)
(2)
[3 marks]
Page 9 of 9
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