MOTIONA body is said to be in motion if it changes its position with respect to a reference point

Learning objectives

Students will be able to

• Define motion

• Define distance

• Define displacement

WARM UP

Watching this video,Calculate UssainBolt’s speed at London Olympics

Vector Quantities and scalar quantities

Scalars- quantities which has only magnitude

Eg.Time,density,mass,length

Vectors- quantities which has magnitude and direction.

Eg.force,velocity

Distance and displacement

Distance covered is the actual length of the path covered by the body. It is a scalar.

Displacement is the shortest distance between the initial and final position of the body. It is a vector.

CONTINOUS ASSESSMENT

1.What are vector quantities? Give examples.

2.What are scalar quantities? Give examples

3.An athlete running with constant speed along a circular track of radius 20m takes 50 seconds to complete one round . What is his distance and displacement at the end of

a) 50 seconds b) 25seconds

4.If a body , which is in motion returns to its original position ,what is its displacement?

Final Assessment

• Define motion

• Define distance covered.

• Define displacement of a body.

• Distinguish between Distance and displacement