Motion

• Motion is a change of position.
• A body is said to be in motion (or moving) when its position changes continuously with respect to a stationary object taken as reference point.

SCALAR AND VECTOR QUANTITIES

Scalar quantities

• The physical quantities which require only magnitude and not direction for their complete description are called ‘scalar quantities’.
• Example: Distance, speed, time, area

Vector quantities

• The physical quantities which need both magnitude and direction for their complete description are called ‘vector quantities’.
• Example: Displacement, velocity, force

DISTANCE

Discovery of Cell:

It is the length of actual path traversed by a body between its initial and final positions, irrespective of the direction in which the body travels.

DISPLACEMENT

• Displacement refers to the straight line path between the initial and the final positions.
• Its SI unit is in metres (m).

COMPARISON BETWEEN DISTANCE AND DISPLACEMENT