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21. Define impulse and impulse - momentum theorem. Why does one feel more pain whehe / she punch on a hard wall than when he /she punch on soft muddy ground. |
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Answer» Impulse is a quantity that is closely related to momentum. When an object has a momentum, and a force is applied for an amount of time, the momentum can change to a new value. The impulse momentum theorem states that the impulse is equal to this change in momentum. This is Newton's Second Law in play: Force applied equals rate of change of momentum. Your confusion stems from the mistaken assumption that the force applied by your hand in both cases is the same. The invariant in both situations is your hand's momentum. In the case of the hard wall, the momentum drops to zero almost instantaneously when compared to the stopping time of the muddy ground. Another reason you might experience less force when punching softer materials is that the reaction force is distributed over the surface of your fist rather than concentrated on your knuckles. |
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