Physics

Vector quantity

Has both magnitude and direction. Examples are displacement, velocity, acceleration, force

Scalar quantity

Has magnitude (size). Examples are time, distance, speed, mass, temperature and area.

Distance

A measure of how far an object has moved. A scalar quantity and is measured in meters (m)

Displacement

A measure of how far and in what direction an object is from its starting point. It is measured in meters but is a vector quantity so it has direction.

Speed

A scalar quantity showing how fast something is moving, measured in meters per second.

Velocity

A vector quantity, so it has direction. Measured in meters per second

Acceleration

The rate in which the velocity of an object changes. A vector quantity and is measured in meters per second (-2)

Newtons First Law

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acts upon by an unbalanced force.

Newtons Second Law

An object will accelerate in the direction of an unbalanced force acting upon it. The size of the acceleration depends upon the mass of the object and the size of the force acting on it.

Newtons Third Law

For every action there is an equal and opposite reaction