Moments and Centre Of Gravity

Question 1

What is the moment of a force?

Answer 1

Measure of its turning effect.

Question 2

How do you increase the turning effect of a force?

Answer 2

1. Increase the SIZE of force

2. Increase the DISTANCE from the applied force to the fulcrum.

Question 3

Formula to find the moment of a force.

Answer 3

Moment =

Force ✖️ perpendicular distance from the force applied to the fulcrum.

Question 4

Force is measured in ____

Answer 4

Newtons

Question 5

What is a lever?

Answer 5

Any rigid body that is free to turn about a fulcrum.

Question 6

What is the Law of the Lever?

Answer 6

When a lever is balanced, the sum of the clockwise moment is equal to the sum of the anticlockwise moment.

Question 7

Centre of gravity?

Answer 7

The point through which all the wight of an object seems to act.

Question 8

The stability of an object ____

Answer 8

Is closely linked to the POSITION of its centre of gravity

Question 9

Stable equilibrium =

Answer 9

Fulcrum ABOVE the centre of gravity

• returns to its original position

Question 10

Unstable equilibrium =

Answer 10

Fulcrum below the centre of gravity

•doesnt return back to its original position

Question 11

Neutral equilibrium =

Answer 11

Fulcrum at the centre of gravity

Stays at the same position

Question 12

What is an object that is balanced?

Answer 12

In equilibrium

Question 13

Why would a body topple?

Answer 13

If the vertical line through the centre of gravity falls OUTSIDE its supporting base.

Question 14

2 factors that helps the stability of an object:

Answer 14

• low centre of gravity

* wide base

Question 15

Fulcrum?

Answer 15

The fixed point or line that force turns around e.g. Hinges of a door