Question

Why second law of motion is also known as real law of motion?

Answer 1

Answer:

According to Newton's second law :F=ma

If F=0 then a=0,m is unequal to 0

Which states that there will be no acceleration in the body if no external force is applied on it.This means that a body in rest will remain at rest and a body in uniform motion will remain in uniform motion which is also stated in Newton's 1st law.

Now,let F1 is the force exerted by a body A on B and F2 is the force exerted by body B on A .

Change in linear momentum of body A= F1×∆t

Change in linear momentum of body B=F2×∆t

Then,F1×∆t+F2×∆t=0

F1×∆t=-F2×∆t

F1=-F2

Action = Reaction,w hich is the third law of motion.

Therefore,2nd law of motion is a real law of motion.

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