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Moment and equilibrium

Total questions: 104

Worksheet time: 4hrs 56mins

Name
Class
Date
1.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
2.
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 smaller person further from the center.
d)
Making the larger person do nothing.
3.
A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?
a)
7.5 Nm
b)
1.5 Nm
c)
750 Nm
d)
150 Nm
4.

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

5.

The point through which the whole weight of the body acts is called

a)

Inertial Point

b)

Center of gravity

c)

Centriod

d)

Central point

6.

Center of gravity is usually located where

a)

more weight is concentrated

b)

less weight is concentrated

c)

less mass is concentrated

d)

more mass is concentrated

7.

Center of gravity is usually located where

a)

more weight is concentrated

b)

less weight is concentrated

c)

less mass is concentrated

d)

more mass is concentrated

8.

Where the center of gravity of a circle lies?

a)

At its centre

b)

Anywhere on its radius

c)

Anywhere on its circumference

d)

Anywhere on its diameter

9.

The moment of a force causes an object to

a)

move forward

b)

move backward

c)

stop moving

d)

turn about a fixed point

10.

Moment can be calculated using the equation:

a)

M = F × d

b)

M = F / d

c)

M = F2 × d

d)

M = F / d2

11.

The SI unit of moment of force is –

a)

m

b)

N

c)

kgf

d)

Nm

12.

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

13.

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)

450 N

b)

350 N

c)

4.5 N

d)

200 N

14.

What do we call forces applied to anything that turns?

a)

Minute

b)

Moment

c)

Minimum

d)

Monument

15.

What is the size of the moment shown by the black arrow?

a)

30 Nm

b)

36 Nm

c)

40 Nm

d)

60 Nm

16.

State the principle of moments.

a)

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.

b)

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.

c)

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.

d)

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.

17.

The figure below shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.


Which pivot positions allows the force F to be as small as possible?

a)

A

b)

B

c)

C

d)

D

18.

The diagram shows a beam. Without any weights, the beam balances at its centre.

Three weights are hung as shown.

At which point does a load of 2 N balance the beam?

a)

A

b)

B

c)

C

d)

D

19.
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
20.

If the forces are balanced, F1 is 1N, and D2 is twice D1 what is F2?

a)

2N

b)

0.5N

c)

1N

21.
What is the anticlockwise moment acting on this crane?
a)
80,000Nm
b)
100,000Nm
c)
120,000Nm
d)
140,000Nm
22.

State the principle of moments

a)

A 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.

b)

B 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.

c)

C 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.

d)

D 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.

23.

What is the moment acting on the seesaw?

a)

1.6Nm

b)

15Nm

c)

16N

d)

4Nm

24.

What is the size of the moment shown by the black arrow?

a)

30 Nm

b)

36 Nm

c)

40 Nm

d)

60 Nm

25.

A beam lies on a pivot. If d2 > d1 and F1 = F2, which direction will the beam turn?

a)

turn clockwise

b)

turn anti-clockwise

c)

not turn

26.

True or False: The magnitude of the moment decreases as the force acts further from the pivot point.  M=d×F⊥M=d\times F\perp  

a)

TRUE

b)

FALSE

27.

What is the unit of moment of force?

a)

N

b)

m

c)

Nm

d)

N/m

28.
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 smaller person further from the center.
d)
Making the larger person do nothing.
29.

A wrench is used to tighten a nut. A 7 N perpendicular force is applied 2 m away from the axis of rotation. What is the torque applied to the wrench?

a)

14 Nm

b)

3.5 Nm

c)

7 Nm

d)

15 Nm

30.

A nut can be loosened more easily with

a)

a short spanner because a larger turning effect can be produced.

b)

a long spanner because a larger turning effect can be produced.

c)

a long spanner because a larger force can be produced.

d)

a short spanner because a larger force can be produced.

31.

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)

450 N

b)

350 N

c)

4.5 N

d)

200 N

32.

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

33.

The figure shows a uniform metre rule pivoted at the 50cm mark. 125g and 200g weights hang from the rule as shown. Calculate where you would hang a 25g mass in order to balance the rule horizontally

a)

20 cm from pivot on the side of 125 g mass

b)

10 cm from pivot on the side of 125 g mass

c)

40 cm from pivot on the side of 200 g mass

d)

10 cm from pivot on the side of 200 g mass

34.

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)

450 N

b)

350 N

c)

4.5 N

d)

200 N

35.

A force of 120 N is applied perpendicularly on a spanner at a distance of 9 cm from a nut. The torque produced by the force will be

a)

12 Nm

b)

10.8 Nm

c)

15 Nm

d)

12.59 Nm

36.

Which one of the following quantities is zero when a uniform rod is supported in the middle?

a)

mass

b)

weight

c)

pressure

d)

moment

37.

A light metre rule is allowed to pivot freely at the zero end. The other end is supported by a spring balance. A weight of 200N is then hung at the 40cm mark. The metre rule stays horizontal. What is the reading on the spring balance?

a)

80

b)

40

c)

8

d)

4

38.

What is the force F needed to balance the bar shown?

a)

3

b)

4

c)

6

d)

8

39.

Jack has a weight of 300 N and sits 2.0 m from the pivot of see-saw. Jill has a weight of 450 N and sits 1.5 m from pivot. Who will move down?

a)

Jack

b)

Jill

c)

Both of them

d)

None of them

40.

Which of the following are not in a state of equilibrium?

a)

An object at rest

b)

An object moving in a straight line at a constant speed

c)

An object that is speeding up.

41.

The net force on an object in equilibrium is:

a)

greater than zero

b)

zero

c)

less than zero

d)

need more specific information to answer

42.

A push or a pull that acts on an object is:

a)

An ampere

b)

Density

c)

A circuit

d)

A force

43.

What are the units of force

a)

Newtons

b)

Voltage

c)

Meters

d)

Pounds

44.

The force from a cable or string is

a)

normal force

b)

weight

c)

tension

d)

scale

45.

A platform scale reads the

a)

size

b)

mass

c)

density

d)

normal force

46.

What is the equilibrium ?

a)

change of velocity

b)

When all the forces that act upon an object are balanced

c)

When the net force is not zero

d)

none

47.

What are the types of equilibrium? ?

a)

Stable ,Instable,Neutral

b)

Stable,Neutral,imstable

c)

Stable,Unstable,Neutral

d)

none

48.

What is the unit of moment?

a)

Nm

b)

Nm-1

c)

Ns

d)

Ns-1

49.

The centre of mass of regular shape is along the line of symmetrical body (point of symmetry). The centre of mass of regular shape is along the line of symmetrical body (point of symmetry)

a)

less than W

b)

more than W

c)

W

d)

impossible to tell

50.

Four table lamps are shown along with the position M of the centre of mass in each case. M Which lamp is the most stable?

a)

A

b)

B

c)

C

d)

D

51.

What is the weight of the beam?

a)

2.0 N

b)

3.0 N

c)

3.3 N

d)

5.0 N

52.

A metal cone with a circular base is placed on a flat surface. The stability of the cone depends on

a)

its weight only.

b)

the diameter of its base and the position of its centre of mass.

c)

the diameter of its base only.

d)

the position of its centre of mass only.

53.

Forces are applied to a uniform beam pivoted at its centre. Which beam is balanced?

a)

A

b)

B

c)

C

d)

D

54.

If a nut and bolt are difficult to undo, it may be easier to turn the nut by using a longer spanner. This is because the longer spanner gives ...

a)

a larger turning moment.

b)

a smaller turning moment.

c)

less friction.

d)

more friction.

55.

Which object is in equilibrium?

a)

A

b)

B

c)

C

d)

D

56.

A beam is pivoted at its centre of mass. It is acted upon by two forces, 10 N and 5.0 N, as shown. What is the resultant moment about the pivot?

a)

175Ncm anticlockwise

b)

1755Ncm clockwise

c)

25Ncm anticlockwise

d)

25Ncm clockwise

57.

The diagrams show three uniform beams P, Q and R, each pivoted at its centre. The two forces acting on each beam are also shown. Which beams rotate clockwise?

a)

A

b)

B

c)

C

d)

D

58.

A uniform horizontal beam, pivoted at its right-hand end, is in equilibrium. What is the weight of the beam?

a)

36 N

b)

40 N

c)

90 N

d)

100 N

59.

A girl uses paper-clips to balance a toy bird on her finger as shown. What is the effect of the paper-clips?

a)

They help to raise the centre of mass above her finger

b)

They help to raise the centre of mass to her finger.

c)

They help to lower the centre of mass below her finger.

d)

They do not affect the centre of mass but increase the weight.

60.
What is the anticlockwise moment acting on this crane?
a)
80,000Nm
b)
100,000Nm
c)
120,000Nm
d)
140,000Nm
61.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
62.
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)
63.
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 smaller person further from the center.
d)
Making the larger person do nothing.
64.
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
65.

Two masses of mass 10.0 and 6.0 kg are hung from massless strings at the end of a light rod. The rod is virtually weightless. A pivot (fulcrum) is placed off center and the system is free to rotate. If the 6.0 kg mass is 4.0 m away from the pivot, how far away is the 10.0 kg mass if the system is not rotating?

a)

0.42 m

b)

2.4 m

c)

4.8 m

d)

4.2 m

66.
A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?
a)
7.5 Nm
b)
1.5 Nm
c)
750 Nm
d)
150 Nm
67.

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

68.

The diagram shows a beam. Without any weights, the beam balances at its centre.

Three weights are hung as shown.

At which point does a load of 2 N balance the beam?

a)

A

b)

B

c)

C

d)

D

69.

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)

450 N

b)

350 N

c)

4.5 N

d)

200 N

70.

A moment is...

a)

a force measured in Newtons

b)

a turning force measured in newton metres

c)

a distance measured in metres

d)

a time intervals measured in clicks

71.

Moment (Nm) =

a)

Force (N) x distance (m)

b)

Angular Force (N°) x distance (m)

c)

Work done (J)

d)

Force (N) x distance (s)

72.
We use levers to make work easier.?
a)
True
b)
False
73.

What to we call forces applied to anything that turns?

a)

Minute

b)

Moment

c)

Minimum

d)

Monument

74.

What is the size of the moment shown by the black arrow?

a)

30 Nm

b)

36 Nm

c)

40 Nm

d)

60 Nm

75.

State the principle of moments.

a)

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.

b)

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.

c)

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.

d)

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.

76.
Equilibrium means _________
a)
being at rest
b)
traveling at light speed
c)
balance
d)
pushing or pulling
77.

Two equal and oppositely directed forces acting on an object will be in equilibrium

a)

Only if they act on the same point on the object

b)

If they are separated by a distance

c)

When they are balanced by a third force

d)

when their moments about the same point are equal

78.

What is the clockwise moment acting on this crane?

a)

80,000Nm

b)

100,000Nm

c)

120,000Nm

d)

140,000Nm

79.

The figure below shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.


Which pivot positions allows the force F to be as small as possible?

a)

A

b)

B

c)

C

d)

D

80.
1. A _________is a simple machine with a fulcrum and a rigid bar.
a)
Pivot
b)
Lever
c)
Wedge
81.
What is the anticlockwise moment acting on this crane?
a)
80,000Nm
b)
100,000Nm
c)
120,000Nm
d)
140,000Nm
82.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
83.
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 smaller person further from the center.
d)
Making the larger person do nothing.
84.
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
85.

Two masses of mass 10.0 and 6.0 kg are hung from massless strings at the end of a light rod. The rod is virtually weightless. A pivot (fulcrum) is placed off center and the system is free to rotate. If the 6.0 kg mass is 4.0 m away from the pivot, how far away is the 10.0 kg mass if the system is not rotating?

a)

0.42 m

b)

2.4 m

c)

4.8 m

d)

4.2 m

86.
A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?
a)
7.5 Nm
b)
1.5 Nm
c)
750 Nm
d)
150 Nm
87.

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

88.

A nut can be loosened more easily with

a)

a short spanner because a larger turning effect can be produced.

b)

a long spanner because a larger turning effect can be produced.

c)

a long spanner because a larger force can be produced.

d)

a short spanner because a larger force can be produced.

89.

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)

450 N

b)

350 N

c)

4.5 N

d)

200 N

90.

What to we call forces applied to anything that turns?

a)

Minute

b)

Moment

c)

Minimum

d)

Monument

91.

What is the size of the moment shown by the black arrow?

a)

30 Nm

b)

36 Nm

c)

40 Nm

d)

60 Nm

92.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
93.

The diagram shows a beam. Without any weights, the beam balances at its centre.

Three weights are hung as shown.

At which point does a load of 2 N balance the beam?

a)

A

b)

B

c)

C

d)

D

94.

A moment is...

a)

a force measured in Newtons

b)

a turning force measured in newton metres

c)

a distance measured in metres

d)

a time intervals measured in clicks

95.
The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P?
a)
A
b)
B
c)
C
d)
D
96.
A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three of them are released simultaneously at the top of an inclined plane and do not slip, which one will reach the bottom first?
a)
cylinder
b)
pipe
c)
sphere
d)
They all reach the bottom at the same time.
97.
Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
a)
The small sphere arrives first.
b)
The large sphere arrives first.
c)
Both reach the bottom at the same time.
98.
Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
a)
The inside horse
b)
The outside horse
c)
Neither - they both have the same angular speed
99.
Torque is the product of a force exerted on an object times the lever arm.
a)
True 
b)
False
100.
Does a bridge anchored resting on two pillars have any torque?
a)
No, it isn't moving
b)
Yes, but it is at equilibrium
c)
Yes, but it will soon break because of the torque
d)
No, Bridges can't have torque
101.
The moment of inertia:
a)
is synonymous with mass
b)
does not depend on where the mass is located
c)
resistance to a change in rotational inertia
d)
more resistance to change = less inertia
102.
When an object is experiencing a net torque
a)
it is in dynamic equilibrium.
b)
it is in static equilibrium.
c)
it is rotating.
d)
it is translating.
103.
The property of a body to resist change in motion.
a)
mass
b)
weight
c)
volume
d)
inertia
104.
A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,
a)
her moment of inertia increases and her angular speed decreases.
b)
her moment of inertia decreases and her angular speed increases.
c)
her moment of inertia increases and her angular speed increases.
d)
her moment of inertia increases and her angular speed remains the same.

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