Two Important Kinetic Quantities


=   The “QUANTITY OF MOTION” possessed by an object

-It is the product of a body’s mass and its velocity

-It affects the outcome of interactions between two bodies, eg. collisions

-After a head-on collision both bodies move, together, in the direction of motion originally possessed by the object with the greater momentum


When EXTERNAL FORCES act on a body they change its

Momentum. This change depends on the external forces and

the time over which they act.

Impulse = Force x Time = Change in Momentum

So, an object’s momentum can change a lot with small force over long time OR large

force over short time.

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