Question

State newton's second law of motion. prove that second law in the real low of motion

Answer 1

Newton’s second law of motion states that:- The net external force applied on an object is directly proportional to the rate of change of linear momentum of the object.

We shall now state that Newton's 1st law and the 3rd law is contained in 2nd law

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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