**Displacement** – is distance in a given direction.

**Speed** – is the rate of change of distance with respect to time.

**Velocity** – is the rate of change of Displacement with respect to time.

**Acceleration** – is the rate of change of Velocity with respect to time.

**Scalar Quantity** – is one which has magnitude only.

**Vector Quantity** – is one which has both magnitude and direction.

**Force** – is that which can cause an acceleration.

**Newton** – is that force which gives a mass of one kg an acceleration of 1 ms-2.

**Friction** – is a force which opposes... (More)