Flashcards in Chapter 37-Moments And Centre Of Gravity Deck (13):

1

## What is the moment of a force?

### A moment of a force is a measure of its turning effect.

2

## Name two methods of increasing the turning effect of an object.

###
1) Increasing the size of the force itself.

2) Increasing the distance from the applied force to the fulcrum.

3

## What is the equation of the moment of a force?

### Moment of a force = force ✖️ perpendicular distance from the force to the fulcrum.

4

## What are levers?

### Levers are simple machines that allow us to move or turn things more easily.

5

## What does the law of the lever state?

### It states that that when a lever is balanced, the sum of the clockwise moments is equal to the sum of the anti-clockwise moments.

6

## What is the centre of gravity of an object?

### It is the point through which all the weight of the object appears to act.

7

## When can an object be balanced?

### It can be balanced if supported either at its centre of gravity or at a point vertically above or below its centre of gravity.

8

## Where are the centres of gravity of equally shaped symmetrical objects?

### At their centres.

9

## Name two ways objects can be made stable.

###
1) Giving them a low centre of gravity.

2) Giving them a wide base.

10

## When is a body in stable equilibrium?

### If, when slightly moved or tilted, its centre of gravity rises.

11

## When is a body in unstable equilibrium?

### If, when slightly tilted or moved, its centre of gravity falls.

12

## When is a body in neutral equilibrium?

### If, when slightly moved or tilted, its centre of gravity neither rises nor falls.

13