Displacement
Displacement is in a given .

Velocity
Velocity is the of change of with repect to time.

Acceleration
Acceleration is the rate of change of with respect to .

Velocity-time graph
A velocity-time graph of a body moving with constant is a straight line.
The is acceleration. The under the graph is the distance travelled.

The acceleration due to gravity
In the absence of air , all objects near the Earth's , if released, will fall downwards with the same acceleration.
The acceleration is called acceleration due to . It's symbol is g.

Scalar Quantity
A quantity that has only and has no in space is called a scalar quantity.

Vector Quantity
A quantity that has both magnitude and a in space is called a quantity.

The Parallelogram Law
If two vectors, drawn tail to tail, are the adjacent sides and ad of the parallelogram abcd, the diagonal from to of this parallelogram is their resultant.

The Triangle Law
If two vectors are drawn to tail the vector from the head of the first to the of the second is their resultant.