Science - Force

This is something that can change the motion of an object

The SI unit for force is the newton (N)

Force is measured using a spring balance

They can change the speed of an object

They can change the shape and size of an object

They can change the direction an object is moving in

These are two objects that have to be in contact for these forces to occur eg. push, pull, friction and tension

These are two objects that do not have to be in contact for these forces to occur eg. gravity

This is the point where the object balances

A wide base

A low centre of gravity

This is when all the forces are balanced in a body

This is when an objects centre of gravity is inside the base of the object

This is when an objects centre of gravity is outside the base of the object

This is when an objects centre of gravity does not change

This is the turning point of an object

This is any rigid body that rotates (free to move) about a fixed point called a fulcrum eg. see-saw

This states that the sum of the clockwise moments equals the sum of the anticlockwise moments

This is the rotation about the fulcrum

This is a force the opposes motion when two objects are place in contact

It allows us to have grip when you walk, run and climb or when you alloy the brakes on a bike or in a car

Wears away the soles of our shoes

Wears away the tyres on our car and bicycles

Lubrication is used to reduce the friction between two solids eg. oil and wax

Surfers wax their surfboards to reduce the friction between the board and the water

This is any object that is able to restore its shape after it has been stretched or compressed eg. springs and elastic bands

This is when elastic objects are extended to a point where they will not restore their shape

This states that the extension of a spring is directly proportional to the applied force

This is because the points give a straight line through the origin