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A large force that acts on a body for a very short period of time is called an 'Impulsive force'.

When a force '$$F$$' acts on a body for a duration of time '$$t$$', then the product of force and time period is called 'impulse', represented by '$$J$$.'

By Newton's second law,

From equations (1) and (2)

Impulse is also equal to the magnitude of change in momentum.

The SI unit of impulse is the $$newton-second$$ ($$Ns$$) and the dimensionally equivalent unit of momentum is the $$kilogram\ meter\ per\ second$$ ($\mathit{kgm}{s}^{-1}$).

Change in momentum can be attained in two ways. They are:
1. a large force acting for a short duration of time, and
2. a smaller force acting for a longer duration of time.
Examples:
• Automobiles are furnished with springs and shock absorbers to decrease jerks while moving on rough roads. • In cricket, while catching the ball, a fielder pulls back his hands. He experiences a smaller amount of force for a longer period of time to catch the ball, resulting in a much lesser impulse on his hands. Reference:
https://commons.wikimedia.org/wiki/File:Andrew_Hodd,_Sussex_Wicketkeeper.jpg