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Laws of Motion
Question
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It is difficult to drive the nail into a wooden block without holding the block. Explain why.

Answer

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. 

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Some More Questions From Laws of Motion Chapter

State Galileo’s law of motion.

Define inertia.

When the branches of an apple tree are shaken, the apples fall down. Why?

A person jumping out from a moving car or bus falls forward. Why?

Due to what type of inertia, the spark leaves the grind stone tangentially while sharpening the knife?

Which law of motion is also called law of inertia?

What is measure of inertia of body?

Which law of motion defines the force?

What happens to a stone tied to the end of string and whirled in a circle if the string suddenly breaks?

Which law of motion gives the quantitative knowledge of force?