Physics
Give reasons for the following:
Hammer drives a nail into the wood only when it is lifted up and then struck.
Related Questions
The moon is revolving around the earth in a circular path. How much work is done by the moon?
Give reasons for the following:
No work is done if a man is pushing against a wall.
Give reasons for the following:
A horse and a dog are running with the same speed. Which one of them has more kinetic energy than the other?
Give reasons for the following:
A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.