Test: Newton Third Law Of Motion
10 Questions MCQ Test Science Class 9 | Test: Newton Third Law Of Motion
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A child on a cart with wheels throws a sandbag forward. As a result:
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.
When a fireman directs a powerful stream of water from a hose-pipe, the hose-pipe tends to go backward. This is due to:
- 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."
Which among the following is true as per Newton’s third law:
- 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.
A person standing on a weighing scale sees a reading on the scale as 148 pounds. This person is acted on by:
- 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.
An archer shoots an arrow. Consider the action force to be the bow string against the arrow. The reaction force is the:
According to Newton's 3rd 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.
Two spring balances pull each other in opposite directions. If the reading of one spring balance is 2 N, the reading shown by the second spring balance will be:
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.
Which one is correct if a bullet is fired from a rifle?
- 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.
Which is incorrect statement about action and reaction forces?
- 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.
A player is catching a ball. Consider the action force to be the impact of the ball against the player’s glove. What is the reaction force?
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.
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