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A bullet fired against a glass window pane makes a hole in it and the glass pane is not cracked.But on the other hand, when a stone strikes the same glass pane, it gets smashed. Why it is so? |
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Answer» There's something called the "Impact" or the "Impulse" factor.....basically a measure of force multiplied by the time of application of force.....A bullet has very less impulse factor due to its time of contact, but has enough momentum to break the glass.......A stone on the other hand has huge momentum and has enough contact time with the glass for its force to be spread around the glass from its point of contact, thereby shattering it starting from the point of contact...... When the bullet strikes the glass pane, the part of the glass pane which comes in contact with the bullet immediately shares the large velocity of bullet and makes a hole. The remaining part of the glass remains at rest as there is no time for the other parts to share the velocity and is therefore not cracked, due to inertia of rest. |
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