Physics - Impulse, force and time
Impulse, force and time
For the momentum  of an individual object to change, a force must act
on it. For example, when two objects and collide, the change in momentum of
is due to the force of on. The change in momentum equals the area under
the force-time graph, also called the impulse.
This graph shows the impulse on object A due to a variable force F
The impulse is the area under the force-time graph. This is estimated by
the 'counting squares' technique. If you can work out impulse then you can
work out change in momentum.  From this you may then be able to
determine the final or initial momentum.
The concept of impulse can in fact be used in any problem involving forces
acting over time. Also:
The average net force acting on an object during a collision can,
therefore, be calculated by dividing the change in momentum by the time
taken to make this change.
Note that in a collision between and, the force of on equals the force
of on , by _Newton's Third Law._
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