Moments

What is moment

the turning effect of a force

How do you calculate moment of a force

moment\=force x distance (M \= Fd)

What is moment measured in

Newton metres (Nm)

What is force measured in

newtons (N)

What is distance measured in

metres (m)

What is the distance in moment

the perpendicular distance from the pivot to the line of action of the force

What happens when an object is balanced

the total clockwise moment of a pivot equals the total anticlockwise moment of the pivot

How do you get the biggest moment possible

apply a big force far away from the pivot

What is a lever

something that transmits the turning effect of a force

What are examples of levers

scissors, wheelbarrows

What happens if the input and output force are on different sides of the pivot

they'll act in different directions

What happens if the input and output force are on same sides of the pivot

they'll act in the same differection

Why is the output force usually larger than the input

because the output force is closer to the pivot than the input force

What is good about levers

we can get a large output force with a small input force

What do gears do

transmit turning effects

How do gears work

One gear is connected to the engine (A), one gear is connected to the wheel (B). When the engine turns, gear A turns and because its interlocked with gear B, gear B also turns. This then causes the wheel to turn.

What is a key point about gears

connected gears turn in opposite directions

How are the radius and turning effect of gears linked

they're directly proportional (a gear that is 2x bigger, will have a turning effect that is 2x larger)