Class 9 Physics-Motion

 DISTANCE:-

*It is the total pathlength traveled by the body.

*It is a scalar quantity.

*SI unit is metre.

*Distance=Speed/Time.

DISPLACEMENT:-

*It is known as change in position of an object.

*It is a vector quantity.

*SI unit is metre.

*Displacement=Velocity/Time.

UNIFORM MOTION VS NON-UNIFORM MOTION:-

SPEED:-

*Speed of an object is defined as the distance travelled by it per unit time.

*It is a scalar quantity.

*SI unit is metre per second (m/s).

*Speed=Distance/Time.

VELOCITY:-

*Velocity of an object is measured as the displacement of the object per unit time.

*It is a vector quantity.

*SI unit is metre per second (m/s).

*Velocity=Displacement/Time

ACCELERATION:-

*It is defined as the rate of change of velocity with respect to time.

*a=final velocity (v) - initial velocity (u)/time. 

*It is a vector quantity.

*SI unit is m/s^2.

GRAPHS:-

1.DISTANCE TIME GRAPH:

2.VELOCITY TIME GRAPH:-

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KINEMATIC EQUATIONS:-

1. v=u+at

2.v^2=u^2+2as

3.s=ut+1/2at^2