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Forces and Moments

Total questions: 40

Worksheet time: 1hrs 20mins

Name
Class
Date
1.
1. A _________is a simple machine with a fulcrum and a rigid bar.
a)
Pivot
b)
Lever
c)
Wedge
2.
What is the anticlockwise moment acting on this crane?
a)
80,000Nm
b)
100,000Nm
c)
120,000Nm
d)
140,000Nm
3.
Unit of force.
a)
Meter
b)
Centimeter
c)
Newton
4.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
5.
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)
6.
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.
7.
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
8.
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
9.
This type of force is an attraction between two objects
a)
contact
b)
gravity
c)
friction
10.
This type of force resist motion between two surfaces that are pressed together
a)
contact
b)
gravity
c)
friction
11.

If the net force is equal to zero, the forces acting on the object are

a)

balanced

b)

unbalanced

12.
What is the net force?
a)
40 N left
b)
0 N Balalnced
c)
400 N right
d)
40 N right
13.
If a 10 kilogram object accelerates suddenly at 15 m/s2, how much force was applied to the object?
a)
150 Newtons
b)
15 Newtons
c)
150 kilograms
d)
100 kilograms
14.
8 N to the left , and 4 N to the right. Find the net force. Is this balanced 
a)
12 N Right  No
b)
4 N Left  No
c)
12 N Right  Yes
d)
4 N Left  Yes
15.
Calculate the Net Force. 
a)
40N, Left
b)
40N, Right
c)
0N, Balanced
d)
75N, Right
16.
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)
17.
A lever is used to raised a mass with a wight of 12 Newtons using only 4 Newtons of force. How many times does the lever multiply the force?
a)
12
b)
4
c)
3
d)
32
18.

A see-saw is made by resting a long plank of wood with its centre of gravity on the barrel.


A boy sits on one side of the barrel and a girl sits on the other side so that the see-saw is balanced.


Which of the following statements must be true?

a)

boy’s weight = girl’s weight

b)

distance x = distance y

c)

moments of the girl = moments of the boy

d)

moment of the girl > moment of the boy

19.

A force is a applied to a long crowbar so as to move a large rock.


Which labelled arrow represents the smallest force needed to move the rock?

a)

A

b)

B

c)

C

d)

D

20.

Which diagram best demonstrates the use of the moment of a force?

a)

A

b)

B

c)

C

d)

D

21.

What is the Unit for moment

a)

Nm

b)

N

c)

W

d)

J

22.
How much force is required to accelerate 10 kg at a rate of 100 m/s2?
a)
1,000kg
b)
10N
c)
10kg
d)
1,000N
23.
What is the speed of the object represented by the graph?
a)
0.5 m/s
b)
2 m/s
c)
5 m/s
d)
4 m/s
24.
How are speed and velocity different?
a)
Speed includes direction
b)
Speed indicates momentum
c)
Velocity includes Momentum
d)
Velocity includes direction
25.

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.

26.

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

27.

How are weight, mass and g related

a)

W=mg

b)

m=Wg

c)

g=Wm

d)

m=W/g

28.

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

29.

What is the equation for moments?

a)

Moment = force x perpendicular distance from pivot

b)

Moment = mass x velocity

c)

Moment = force x distance

d)

Moment = force x parallel distance from pivot

30.

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

31.
why is the car on the left unstable?
a)
Its centre of mass is high
b)
it has a narrow base
c)
it has a high height
d)
all of the above
32.

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

33.
A basketball with a mass of 0.60 kg is accelerated with a force of 10.8 N. If resisting forces are ignored, what is the acceleration of the basketball to the nearest m/s2?
a)
16 m/s2
b)
17 m/s2
c)
18 m/s2
d)
19 m/s2
34.

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

35.
If the board is 2 meters in length, and and the girl on the left who is 45 kg is far away 0.8 meters from pivot point what is the mass of the girl on the right?
a)
20 kg
b)
25 kg
c)
30 kg
d)
35 kg
36.

When an object is moving, friction acts in the _______ direction as the motion.

a)

perpendicular

b)

same

c)

opposite

d)

precise

37.

This motion graph represents:

a)

constant speed

b)

acceleration

c)

body at rest

d)

slowing down

38.
A wheeled cart is moving to the right at a constant speed.  Two forces of equal magnitude are acting upon the cart. Which of the following best describes the forces and motion of the cart?
a)
Balanced Forces, Constant Speed
b)
Balanced Forces, Acceleration
c)
Unbalanced Forces, Constant Speed
d)
Unbalanced Forces, Acceleration
39.
What does this graph represent?
a)
Constant Speed
b)
Acceleration
c)
Not moving
40.
Which is true from Newton's Third law of motion?
a)
For every action force there is a smaller reaction force in the opposite direction.
b)
For every action force there is an equivalent reaction force in the opposite direction.
c)
 Both 1 and 2
d)
None of the above

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