Question

What's Newton 3rd law?
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Answer 1

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Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself.

Answer 2

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Newton 's third law of motion :- it states that every action , There os an equal and opposite reaction .Action and reaction forces act on the different bodies, thus they can't create equilibrium .

thus , Reaction force = Action Force

$\underline{\underline{\sf{\green {Know more :}}}}$

Newton ' s first law of motion :- it states that a body continues to remain in its rest state or a uniform motion along a straight line endless acted upon by external unbalanced force it is also called Law of inertia.

Newton ' s second law of motion :- it is said that external force acting on an object is directly proportional to rate of change of its momentum.

Force :- a force is a push or pull which causes a change in position, shape, state of rest or state of motion of the body.

Inertia :- inertia is a property of a body by virtue of which it opposes any change in its state of rest , state of motion or direction of body which has greater mass has higher inertia .

in other words mass of a body is a measure of inertia .