Question

Which among the following is true as per Newton's third law?

• A. Action and reaction forces are always equal and opposite.
• B. An object tends to move in a straight line until and unless an external force is applied.
• C. None of the above.

Answer 1

The correct option is A

Action and reaction forces are always equal and opposite.

The explanation for the correct option:

In the case of option A,

1. According to newton's third law, for every action, there is an equal and opposite reaction.
2. Whenever one body's external force is applied to another, the first body feels a force equivalent in size to the opposite direction of the force exerted.

The diagram of newton's third law is shown below:

The explanation for the correct option:

In the case of option B,

1. In accordance with newton's first law, if an object is moving in a straight line, it will continue to move in a straight line until and unless an external force is applied.
2. The statement in option B follows Newton's first law instead of Newton's third law. Thus, option B is incorrect.

Therefore, option A is the correct choice.