Principle of Moments | 343 plays

1.

Multiple Choice

30 sec

1 pt

What is the anticlockwise moment acting on this crane?

80,000Nm

100,000Nm

120,000Nm

140,000Nm

2.

Multiple Choice

30 sec

1 pt

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.

3.

Multiple Choice

30 sec

1 pt

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

4.

Multiple Choice

30 sec

1 pt

What is the moment produced by the 15 N?

15 Nm (clockwise)

150 Nm (anti - clockwise)

1.5 Nm (anti - clockwise)

0.15 Nm (clockwise)

5.

Multiple Choice

30 sec

1 pt

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

3.4 m

2.8 m

4.4 m

1.6 m

6.

Multiple Choice

30 sec

1 pt

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

B

C

D

7.

Multiple Choice

30 sec

1 pt

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

B

C

D

8.

Multiple Choice

30 sec

1 pt

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

9.

Multiple Choice

30 sec

1 pt

What is the unit of moment f force?

N

m

Nm

N/m

10.

Multiple Choice

30 sec

1 pt

Moment is a quantity that tells turning effect of a force about turning point.

TRUE

FALSE

11.

Multiple Choice

30 sec

1 pt

Calculate the unknown force X!

4.0 N

6.0 N

10 N

12 N

12.

Multiple Choice

30 sec

1 pt

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

0.2m

0.5m

0.45m

0.42m

13.

Multiple Choice

30 sec

1 pt

State the principle of moments.

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.

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.

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.

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.

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