Question
It is difficult to drive the nail into a wooden block without holding the block. Explain why.
Solution
The block should be motionless w.r.t. nail, to drive the nail into the block.
When a person hammer the nail without holding the block, the nail and block both move forward as a single system and hence nail does not get into the block.
But, if we support the block with something, then the reaction of the support keeps the block motionless and the nail gets into block on hammering easily.
When a person hammer the nail without holding the block, the nail and block both move forward as a single system and hence nail does not get into the block.
But, if we support the block with something, then the reaction of the support keeps the block motionless and the nail gets into block on hammering easily.
