Physics (NTSE/Olympiad)  

2. Force & Laws Of Motion


Impulse :
If a force F is applied on a body of mass m for a time interval Δt and if the change in velocity is Δv then
∴ Impulse = F dt = m Δv
Impulse = change in momentum
Unit of impulse is newton × second.
Examples of Impulse
Example. While catching a cricket ball a player moves his hands backwards. Cricket ball coming towards fielder has a large momentum. By doing so he increases the time interval to reduce the momentum of the ball. Rate of change of momentum becomes slow.

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