ocr: What IS impulse? We all know that kicking a football hurts much less than kicking a rock. Working out what happens to momentum in the tWo ditterent collisions can help us to see why one hurts more than the other. The football is much softer than the rock. When you kick the football, it 'gives' slighdy where your footmakes contact. The surface of the ball then springs back and the ball flies away. While this is happening, the ball and you foot may stay in contact: for roughly a tenth of second. The hard surface of the rock does not 'give' at all when you kick it. For this reason, it. stays in c ...
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