Test: Newton Third Law Of Motion - Class 9 MCQ

The child moves in the backward direction as a consequence of action-reaction law. Sandbag exerts an equal and opposite force in the backward direction.

• According to the circumstances mentioned in the question, a powerful stream of water on a fire from a hose-pipe tend to go backward.
• This phenomenon is the practical life example of Newton's third law, " Every action has an equal and opposite reaction."

Newton's third law states that forces always occur in pairs. When one body exerts a force on a second body, the second body exerts an equal and opposite force back on the first body. This principle can be summarised as follows:

• Action and reaction forces are equal in strength.
• They act in opposite directions.
• These forces always occur simultaneously.
• They do not cancel each other out because they act on different objects.

This law is fundamental in understanding how objects interact in the world around us. For example, when you push against a wall, the wall pushes back with equal force, which is why you do not move through it.

• It is Newton's third law of motion which states that every action has an equal and opposite reaction.
• So, every action and reaction forces are equal and in opposite direction.

• Gravitational force is acting in the downward direction. As we know every action has a reaction.
• So, there is an equal and opposite force acting in opposite direction also.

According to Newton's 3^rd law of motion, " Every action has an equal and opposite reaction ".  So if we have to push the arrow in forward direction, we will pull the bow string in backward direction.

The spring balances are hooked and pulled in opposite direction. By the action-reaction pair force, the reading must be equal to 2.0 N. 

• When a bullet is fired from a rifle, the rifle exerts a force on the bullet in the forward direction. This is the action force.
• The bullet also exerts an equal force on the rifle in the backward direction. This is the reaction force.
• So because of this action-reaction pair force, the bullet moves in the forward direction and the rifle moves in the backward direction.

• The action and reaction force always act on different objects.
• Two forces acting on the same object, even if they have the same magnitude and point in the opposite direction, never form an action-reaction pair.

Reaction force: Force that the glove exerts on the ball is the reaction force, opposite to the impact of the ball on the player’s glove.