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Moments

Total questions: 20

Worksheet time: 2hrs 32mins

Name
Class
Date
1.
1. A _________is a simple machine with a fulcrum and a rigid bar.
a)
Pivot
b)
Lever
c)
Wedge
2.
We use levers to make work easier.?
a)
True
b)
False
3.
What is the anticlockwise moment acting on this crane?
a)
80,000Nm
b)
100,000Nm
c)
120,000Nm
d)
140,000Nm
4.
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
5.
3. Which type of lever is this?
a)
First Class Lever
b)
Second Class Lever
c)
Third Class Lever
6.
2. The place where a lever pivots is called the _______.
a)
Pivot point
b)
Tissue
c)
Fulcrum
7.
6. What kind of lever is this?
a)
First Class Lever
b)
Second Class Lever
c)
Third Class Lever
8.
A wheelbarrow is an example of a:
a)
1st class lever
b)
2nd class lever
c)
3rd class lever
9.
2. The place where a lever pivots is called the _______.
a)
Pivot point
b)
Tissue
c)
Fulcrum
10.
1. A _________is a simple machine with a fulcrum and a rigid bar.
a)
Pivot
b)
Lever
c)
Wedge
11.
Which statement describes a vector?
a)
It has magnitude but no direction
b)
It has direction but no magnitude
c)
It has both direction and magnitude
d)
It has constant magnitude but no
 direction
12.

What is the resultant force?

100 N 230 N

<------ --------->

a)

30 N to the right

b)

230 N to the right

c)

130 N to the right

d)

This is a balanced force

13.

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

14.

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

15.

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

16.
What does this graph represent?
a)
Constant Speed
b)
Acceleration
c)
Not moving
17.

This motion graph represents:

a)

constant speed

b)

acceleration

c)

body at rest

d)

slowing down

18.

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

a)

perpendicular

b)

same

c)

opposite

d)

precise

19.
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
20.

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

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