A bullet fired from a gun makes a clean whole in a window whereas a stone pebble thrown brakes the whole window.why?
As the stone hits the window, the glass vibrates.
As the bullet hits the window, the glass vibrates.
This vibration causes the window to break.
The frequency of the vibration depends on the elasticity of the collision (how the transfer of energy occurs). The elasticity of the collision depends on the structure of the object that collides with the glass.
The stone is much larger that the bullet. The stone is not as smooth as the rock. The shape of the stone is not aerodynamic, so, the stone will release much energy as it moves through the glass. When the stone collides with the glass at a very low speed, releasing much if its kinetic energy, the energy will cause the glass to vibrate enough to break into pieces.
Hope this helps,
it's due to the velocity of the gun as it is very fast it makes a clean hole whereas the velocity of the stone can't be that fast....and it also depends on the MASS ,the gun's mass will be lesser than that of the stone and hence that impact of it will be high.
HOPE IT HELPS!!!