Moments

Question 1

What is the turning effect of a force called?

Answer 1

Moment

The moment is defined as the effect of a force that causes an object to rotate.

Question 2

What is the formula for calculating the moment of a force?

Answer 2

M = Fd

M is the moment, F is the force, and d is the perpendicular distance from the pivot.

Question 3

What unit is used to measure the moment of a force?

Answer 3

Newton meter (Nm)

This unit represents the torque produced by a force acting at a distance.

Question 4

What factors increase the size of the moment of a force?

Answer 4

• Larger force
• Longer distance from the pivot

Both factors contribute to a greater turning effect.

Question 5

What angle should a force be applied to achieve the maximum moment?

Answer 5

At right angles (perpendicular)

Applying the force at any other angle results in a smaller moment.

Question 6

What condition must be met for an object to be balanced at a pivot?

Answer 6

Total anticlockwise moment equals total clockwise moment

This balance prevents the object from rotating.

Question 7

In the example provided, what is the weight of the steel girder?

Answer 7

1000 N

This weight is crucial for calculating the tension in the supporting cable.

Question 8

What is the distance from the pivot to the center of the girder in the example?

Answer 8

2 m

This distance is used to calculate the moments about the pivot.

Question 9

How does a lever make it easier to do work?

Answer 9

By increasing the distance from the pivot at which the force is applied

This allows for a smaller force to achieve the same moment.

Question 10

What are gears used for?

Answer 10

To transmit the rotational effect of a force from one place to another

Gears interlock to transfer motion efficiently.

Question 11

What happens to the moment of a force when transmitted to a larger gear?

Answer 11

It produces a higher moment

The distance to the pivot is greater, enhancing the turning effect.

Question 12

True or False: A larger gear will turn faster than a smaller gear.

Answer 12

False

The larger gear turns slower than the smaller gear.

Question 13

Fill in the blank: The moment of a force can be calculated using the formula M = Fd, where d is the _______.

Answer 13

perpendicular distance from the pivot

This distance is critical in determining the moment.