Moments + levers and gears

What causes an object to rotate?

A force or a system of forces.

What’s the moment of the force?

The turning effect of a force.

How can its size be calculated? (word)

Moment of a force= force × distance

How can its size be calculated? (symbol)

M=fd

What are the moment of a force’s units?

Nm

What are the force’s units?

N (newtons)

What are the distance’s units?

m (metres)

What happens if an object is balanced?

The sum of the clockwise moments equals the sum of the anticlockwise moments.

How can levers and gears be used and how?

To increase the moment of a force, making it easier to lift or rotate an object.

What happens if a small gear drives a large gear?

The moment of the applied force is increased but the large gear moves slower (and vice versa).

What does a lever allow?

A large moment of force.

How is a lever produced by?

Allowing force to be applied further from the pivot.