Question

why does a bullet when fired against a glass window pane make a hole in it , and the glass pane will smash it ?

Answer 1

A bullet is shot at a very high velocity, but the surface area of the bullet makes the difference. Pressure exerted by any body depends on the force applied and the area on which it acts. To shatter a glass pane, more surface area is required. A bullet is so small that it only makes a hole in the glass. However, occasionally, the vibrations produced due to collision may shatter the glass.

Answer 2

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Initially, the entire glass is in a state of rest.

When a bullet strikes the glass pane the part of the glass pane which comes in contact with the bullet immediately share the large velocity of the bullet and flies away making a hole.

The remaining part of the glass, due to inertia of rest remains at rest and is not cracked.

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