A block is placed on the horizontal surface. There are two forces acting on the block. One, the downward pull of gravity, and the other, a normal force acting on it. Are these forces equal and opposite? Do they form action-reaction pair?

State the action and reaction in the following:

Moving rocket

Why is it difficult to walk on slippery road?

A boy is standing on a horizontal surface wearing skates. What will the boy experience if he pushes the wall?

State Newton's third law of motion.

“Action and reaction are equal and opposite, still their resultant is not zero.” Explain.

If the mouth of an inflated balloon is untied, what will you observe? Explain your observation.

Explain why it is difficult for a fireman to hold a hose, which ejects large amounts of water at high velocity?

Explain the principle on which rocket works.

Any two forces which are equal and opposite form an action-reaction pair.

Body A collides with a body B. A exerts a force of $10 \mathrm{N}$ on B. The force which B exerts on A is _____ $\mathrm{N}$.

If the earth attracts a body with a force of $20 \mathrm{N}$, then what force is exerted on the earth by the body?

What is Newton's third law? Give some examples where this law can be applied.