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When a bullet is fixed from a rifle, it is more dangerous than air molecule hitting a personal though both of them have almost same speed. Why does it happen?

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Because bullet has more mass....hence more momentum.
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By Newton's 2nd law Force applied is proportional to the rate of change of momentum which varies with mass and acceleration of the object being fired. So in the case of a bullet, You have more mass compared with air and hence it can create a force (F=ma) which will penetrate the body which is not the...
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By Newton's 2nd law Force applied is proportional to the rate of change of momentum which varies with mass and acceleration of the object being fired.

So in the case of a bullet, You have more mass compared with air and hence it can create a force (F=ma) which will penetrate the body which is not the case with air.

A good example to understand Newton's 2nd law. Happy learning!!!!!

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