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CBSE Class 9 Answered

we know that F=Mg .But if a ball of heavier mass is at free-fall at a height of 15cm the tiles will not break.But if a ball of that same mass falls from a height of 100cm the tiles will break. Also we know that g is fixed and the mass of the object is also same so why does it happen?
Asked by | 19 Sep, 2012, 02:43: PM
answered-by-expert Expert Answer
The tiles break due to the force exerted by ball on the tiles which is proportional to the rate of change of momentum of ball when it strikes on tiles.
Rate of change of momentum = m(v-u)/t
here v = velocity after collision let us assume it to be 0
u = velocity just before collison.
t =time taken in the collision we can assume it to be independent of u
thus force is proportional to u
and the more height the ball falls from, more is u
and thus tiles break when ball falls from greater height.
Answered by | 20 Sep, 2012, 02:01: PM

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