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| Impulse |
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| The effect of a force not only depends on its magnitude but also on the time for which the force acts. When a large force acts for a very short time, one more important parameter comes into play. |
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| If the force does not vary with time, then |
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 units of impulse are gcms-1 or kgms-1 |
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| We know that |
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 Impulse of a varying force is equal to the change in momentum produced by the force. |
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 While catching a moving cricket ball, a player lowers his hands after catching the ball. |
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 Automobiles are provided with spring systems to reduce the damage to the vehicle when it receives a shock. |
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 A man falling from a certain height gets injured more severely when he falls on concrete when compared to his falling on sand. |
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 It is more difficult to catch a cricket ball when compared to a tennis ball. |
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