| Read the following and answer any four questions from [6] to [10]. |
| While catching a fast moving cricket ball, a fielder in the ground gradually pulls his hands backwards with the moving ball. In doing so, the fielder increases the time during which the high velocity of the moving ball decreases to zero. |
| Thus, the acceleration of the ball is decreased and therefore the impact of a catching the fast moving ball (see figure) is also reduced. |
| If the ball is stopped suddenly then its high velocity decreases to zero in a very short interval of time. |
| Thus, the rate of change of momentum of the ball will be large. Therefore, a large force would have to be applied for holding the catch that may hurt the palm of the fielder. |
 |
| A fielder pulls his hands gradually with the moving ball while holding a catch |
A) Due to large force
B) Due to large velocity
C) Both [a] and [b]
D) None of the above
Correct Answer: A
Solution :
| [a] More force is required to stop the cricket ball (which has more mass) and less force is required to stop the tennis ball (which has less mass). |
| The force required to stop a moving ball is directly proportional to mass (m) and velocity , i.e. momentum =m \[\times \] v. |
| (\[\because \] Force is rate of change of momentum) |
| Hence, fast moving ball will require more force. |
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