Question

According to the Newton's third law of motion, action and reaction (a) always act on the same body (b) always act on different bodies in opposite directions (c) have the same magnitude and directions (d) act on either body at normal to each other ​

Answer 1

Explanation:

Sir Isaac Newton has contributed a lot in the field of Science especially Physics and Chemistry. He gave three laws of Newton which we study in the branch of Dynamics.

• Newton's first law of motion.
• Newton's second law of motion.
• Newton's third law of motion.

According to Netwon's third law of motion:

If a body exerts a force on a second body, the second body exerts a force that is equal in magnitude and opposite in direction to the first force. So for every action force there is always a reaction force. And these forces acts on two different bodies.

Final Answer:

As per third law, two pairs of forces are involved and they act on two different bodies. They are equal in magnitude but opposite in direction. So, the correct answer is:

$\LARGE{ \therefore{ \boxed{ \sf{ \blue{Option \: B}}}}}$

And we are done !!

Answer 2

Answer:

b) always act on different bodies in opposite directions.

Explanation:

Newton's Third Law Of Motion:

The second law relates the external force on a body to its acceleration. What is the origin of the external force on the body? What agency provides the external force? The simple answer in Newtonian mechanics is that the external force on a body arises due to some other body. Consider a pair of bodies A and B. B gives rise to an external force on A. A natural question is: Does A in turn give rise to an external force on B? In some examples, the answer seems clear. If you press a coiled spring, the spring is compressed by the force of your hand. The compressed spring in turn exerts a force on your hand and you can feel it. But what if the bodies are not in contact? The earth pulls a stone downwards due to gravity. Does the stone exert a force on the earth. The answer according to Newton is:

Yes, the stone does exert an equal and opposite force on the earth. We do not notice it since the earth is very massive and the effect of a small force on its motion is negligible.

According to Issac Newton force never occurs singly in nature. Force is the mutual interaction between two bodies. Forces always occurs in pairs. Further, the mutual forces between the two bodies are always equal and opposite. This idea was expressed by Newton in the form of the third law of motion which states that "to every action there is an equal and opposite reaction".

Hence, option b