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Review: Moments

Total questions: 50

Worksheet time: 3hrs 5mins

Name
Class
Date
1.
A uniform beam of 1 m is being balanced as shown below. What is the direction of the moment of the 3N force about the pivot U?
a)
upwards
b)
downwards
c)
clockwise
d)
anticlockwise
2.
A uniform beam of 1 m is being balanced as shown below. What is the direction of the moment of the 2N force about the pivot U?
a)
upwards
b)
downwards
c)
clockwise
d)
anticlockwise
3.
A uniform beam of 1 m is being balanced as shown below. What is the direction of the moment of the force F about the pivot U?
a)
upwards
b)
downwards
c)
clockwise
d)
anticlockwise
4.
A uniform beam of 1 m is being balanced as shown below. What is the moment of the 3 N force about the pivot U?
a)
10 N cm
b)
30 N cm
c)
90 N cm
d)
180 N cm
5.
A uniform beam of 1 m is being balanced as shown below. What is the moment of the 2 N force about the pivot U?
a)
10 N cm
b)
80 N cm
c)
90 N cm
d)
180 N cm
6.
A uniform beam of 1 m is being balanced as shown below. What is the moment of force F about the pivot U?
a)
0 N cm
b)
40 F cm
c)
50 F cm
d)
80 F cm
7.
A uniform beam of 1 m is supported at the 50 cm mark. Given that the weight of 2 N hangs at the 30 cm mark, what is the moment created by the 2 N force?
a)
20 N cm
b)
60 N cm
c)
100 N cm
d)
200 N cm
8.
A uniform beam of 1 m is supported at the 50 cm mark. Given that the weight of 2 N hangs at the 30 cm mark, how far away from the pivot must another weight of 4 N be hung to balance the beam?
a)
10 cm
b)
15 cm
c)
20 cm
d)
40 cm
9.
A uniform beam of 1 m is supported at the 50 cm mark. Given that a weight of 2 N hangs at the 30 cm mark, at which position must another weight of 2 N be hung to balance the beam?
a)
20 cm mark
b)
30 cm mark
c)
50 cm mark
d)
70 cm mark
10.
A 1 m long uniform beam is supported at the 50 cm mark. Given that a weight of 2 N hangs at the 30 cm mark, at which position must another weight of 1 N be hung to balance the beam?
a)
40 cm mark
b)
60 cm mark
c)
70 cm mark
d)
90 cm mark
11.
A uniform beam of 1 m is supported at the 50 cm mark. Given that the weight of 2 N hangs on the 10 cm mark, what is the weight W that hangs at the 60 cm mark to balance the beam?
a)
0.5 N
b)
2 N
c)
4 N
d)
8 N
12.
A 1m long uniform beam is supported by 50 cm mark. Given that a weight W acting at the 10 cm mark is balanced by a 7 N force and a 3 N force acting downwards at 60 cm mark and 80 cm mark respectively, calculate the weight W.
a)
4 N
b)
5 N
c)
8 N
d)
10 N
13.
A 1m long uniform beam is supported at the 50 cm mark. Given that a 5 N weight acting at the 10 cm mark is balanced by a force F and a 3 N force acting downwards at 60 cm mark and 80 cm mark respectively as shown, calculate the force F.
a)
2 N
b)
3 N
c)
7 N
d)
11 N
14.
A 1 m long uniform beam is being balanced as shown. Calculate the force F.
a)
2 N
b)
3 N
c)
7 N
d)
11 N
15.
A 1 m long uniform beam is supported at the 30 cm mark by the pivot. Given that a mass of 2 kg hangs at the 0 cm mark, at which position must another mass of 1 kg be hung to balance the beam? (Assuming the mass of beam = 0 kg)
a)
30 cm mark
b)
60 cm mark
c)
70 cm mark
d)
90 cm mark
16.
A 1 m long uniform beam of mass 1 kg is supported at the 30 cm mark by a pivot. Given that a mass of 2 kg hangs at the 0 cm mark, at which position must another mass of 1 kg be hung to balance the beam?
a)
30 cm mark
b)
60 cm mark
c)
70 cm mark
d)
90 cm mark
17.
A 1 m long uniform beam of mass 1 kg is supported at the 30 cm mark bya pivot. Given that a mass of 2 kg hangs at the 0 cm mark, what is the mass of the object A hanging at the 70cm mark to balance the beam? (Take g = 10 N/kg)
a)
1 kg
b)
2 kg
c)
3 kg
d)
4 kg
18.

Moment = force / distance from pivot

a)

True

b)

False

19.
A 1 m long uniform beam is being balanced as shown below. Calculate the force F.
a)
1.00 N
b)
1.25 N
c)
2.50 N
d)
5.00 N
20.
A 1 m long uniform beam of mass 2 kg mass is being lifted vertially up by a force F at 100 cm mark. What is the minimum force to do so?
a)
1 N
b)
2 N
c)
10 N
d)
20 N
21.
A 1 m long uniform beam of 6 N weight is being lifted up vertically by a force F at the 75 cm mark. What is the minimum force to do so?
a)
2 N
b)
4 N
c)
6 N
d)
8 N
22.
Which spanner turns the bolt with the least effort?
a)
A
b)
B
c)
C
d)
D
23.
A 10 kg box, 20 kg box and a 30 kg box are stacked up. Which of the following combinations will be the most unstable?
a)
A
b)
B
c)
C
d)
D
24.

What is the anticlockwise moment acting on this crane?

a)

20,000Nm

b)

100,000Nm

c)

120,000Nm

d)

500,000Nm

25.

What is the moment produced by a 15-Newton hanged cube?

a)

1.5Nm (anticlockwise)

b)

1.5Nm (clockwise)

c)

150Nm (anticlockwise)

d)

150Nm (clockwise)

26.

A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?

a)

The larger person moving further away from the center.

b)

Moving the smaller person closer to the center.

c)

Moving the larger person closer to the center.

d)

Moving the two people away from the center

27.

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

a)

4.5Nm

b)

100Nm

c)

450Nm

d)

600Nm

28.

State the principle of moments

a)

When a system is in equilibrium, the sum of the total clockwise moment is less than the sum of the total anti-clockwise moment about the same pivot.

b)

When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the same pivot.

c)

When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the different pivot.

d)

When a system is in equilibrium, the sum of the total clockwise moment is greater the sum of the total anti-clockwise moment about the same pivot.

29.

The moment of a force causes an object to

a)

move forward

b)

move backward

c)

stop moving

d)

turn about a fixed point

30.

Moment can be calculated using the equation:

a)

M = F × d

b)

M = F / d

c)

M = F2 × d

d)

M = F / d2

31.

The SI unit of moment of force is –

a)

m

b)

N

c)

kgf

d)

Nm

32.

When an object is in equilibrium, which equation is true?

a)

Clockwise moment = anticlockwise moment

b)

Clockwise moment + anticlockwise moment = 0

c)

Clockwise moment / anticlockwise moment = 0

d)

Clockwise moment + anticlockwise moment = resultant force

33.

A nut can be loosen more easily with

a)

A short spanner because a large turning effect can be produced

b)

A short spanner because a larger force can be produced.

c)

A heavy spanner because a larger force can be produced.

d)

long spanner because a large turning effect can be produced.

34.
The easiest way to open a heavy door  is by applying the force
a)
Near the hinges
b)
In the middle of the door
c)
At the edge of the door far from the hinges
d)
At the top of the door
35.
What is the moment produced by the 15 N?
a)
15 Nm (clockwise)
b)
150 Nm (anti - clockwise)
c)
1.5 Nm (anti - clockwise)
d)
0.15 Nm (clockwise)
36.

Assuming the system is in equilibrium, calculate the missing distance d

a)

3.4 m

b)

2.8 m

c)

4.4 m

d)

1.6 m

37.

At what distance should a 2N load placed from the pivot so that the see saw won't move?

a)

0.2m

b)

0.5m

c)

0.45m

d)

0.42m

38.
a)

Clockwise

b)

Anticlockwise

39.
a)

Clockwise

b)

Anticlockwise

40.

Is this a moment?

a)

Yes

b)

No

41.

Is this a moment?

a)

Yes

b)

No

42.

How do you calculate moment?

a)

force ×\times distance 

b)

force ÷\div distance 

c)

distance ÷\div time 

d)

force ×\times time 

43.

A beam lies on a pivot. If F1 = F2 the beam will..

a)

turn clockwise

b)

turn anti-clockwise

c)

not turn

44.

The further the force is from the pivot, the greater its turning effect.

a)

True

b)

False

45.

Principle of moments states that an object is balanced when clockwise moments are equal to anticlockwise moments.

a)

True

b)

False

46.

What is the moment acting on the left side of the pivot?

a)

2 Nm

b)

20 Nm

c)

200 Nm

d)

0.2 Nm

47.

What is the moment acting on the right side of the pivot?

a)

2 Nm

b)

20 Nm

c)

200 Nm

d)

0.2 Nm

48.

The beam is balanced.

a)

True

b)

False

49.

A force of 4 N acts on a lever 2 m from the pivot. What is the moment?

a)

8 Nm

b)

6 Nm

c)

2 Nm

d)

3 Nm

50.

A cat weighing 50 N is 1 m from the pivot. How far away does a mouse weighing 0.5 N have to be to balance the beam?

a)

1 m

b)

10 m

c)

100 m

d)

1000 m

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