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moments

Total questions: 15

Worksheet time: 30mins

Name

Class

Date

1. A _________is a simple machine with a fulcrum and a rigid bar.

Pivot

Lever

Wedge

What is the anticlockwise moment acting on this crane?

80,000Nm

100,000Nm

120,000Nm

140,000Nm

What is the moment acting on the seesaw?

1.6Nm

15Nm

16N

4Nm

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

The larger person moving further away from the center.

Moving the smaller person closer to the center.

Moving the smaller person further from the center.

Making the larger person do nothing.

The easiest way to open a heavy door is by applying the force

Near the hinges

In the middle of the door

At the edge of the door far from the hinges

At the top of the door

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?

0.42 m

2.4 m

4.8 m

4.2 m

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?

7.5 Nm

1.5 Nm

750 Nm

150 Nm

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

3.4 m

2.8 m

4.4 m

1.6 m

3. Which type of lever is this?

First Class Lever

Second Class Lever

Third Class Lever

10.

6. What kind of lever is this?

First Class Lever

Second Class Lever

Third Class Lever

11.

A see saw is an example of a:

1st class lever

2nd class lever

3rd class lever

12.

A nut can be loosened more easily with

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

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

a long spanner because a larger force can be produced.

a short spanner because a larger force can be produced.

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?

450 N

350 N

4.5 N

200 N

14.

What to we call forces applied to anything that turns?

Minute

Moment

Minimum

Monument

15.

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

30 Nm

36 Nm

40 Nm

60 Nm

100 %

moments

Total questions: 15

Worksheet time: 30mins

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