## Newtons Third Law

Discuss Physics and Physics Olympiad related problems here
Abdul Muntakim Rafi
Posts: 173
Joined: Tue Mar 29, 2011 10:07 pm
Location: bangladesh,the earth,milkyway,local group.

### Newtons Third Law

Dear Friends,

I want a proof of Newton's third law.Can u give me an easy proof?

Newton's 1st and 3rd law can be derived from the 2nd one.Then why we say Newton's three laws of motions?We should say Newton's law of motion.We should see them as one.

Best Wishes
Rafi
Man himself is the master of his fate...

tanvirab
Posts: 446
Joined: Tue Dec 07, 2010 2:08 am
Location: Pasadena, California, U.S.A.

### Re: Newtons Third Law

The first and third law cannot be derived from the second law. The first law and third law are postulates; there is no proof or derivation for them, only experimental evidence. The second law is an experimental result.

leonardo shawon
Posts: 169
Joined: Sat Jan 01, 2011 4:59 pm
Location: Dhaka

### Re: Newtons Third Law

if u want a good experience of the third law then PUNCH on a wall
Ibtehaz Shawon
BRAC University.

long way to go .....

nayel
Posts: 268
Joined: Tue Dec 07, 2010 7:38 pm
Location: Dhaka, Bangladesh or Cambridge, UK

### Re: Newtons Third Law

In fact the first law postulates the existence of inertial frames in which the other laws are applicable.
"Everything should be made as simple as possible, but not simpler." - Albert Einstein

raihan khan
Posts: 35
Joined: Wed Mar 16, 2011 12:30 pm
Location: Dhaka

### Re: Newtons Third Law

then shouldn't we use axioms or postulates instead of law. isn't it confusing.

nayel
Posts: 268
Joined: Tue Dec 07, 2010 7:38 pm
Location: Dhaka, Bangladesh or Cambridge, UK

### Re: Newtons Third Law

"Axiom" is mostly used in mathematics. In mathematics laws are proved from axioms. But in physics experimental results are called laws.
"Everything should be made as simple as possible, but not simpler." - Albert Einstein

qeemat
Posts: 11
Joined: Thu Feb 16, 2012 6:43 pm

### Re: Newtons Third Law

Newton's 3rd law may be formally stated:

"Forces always occur in pairs. If object A exerts a force F on object B,
then object B exerts an equal and opposite force –F on object A"

or in slogan style:

"Every action has an equal and opposite reaction"

nayel
Posts: 268
Joined: Tue Dec 07, 2010 7:38 pm
Location: Dhaka, Bangladesh or Cambridge, UK

### Re: Newtons Third Law

Who asked for a statement of Newton's third law?
"Everything should be made as simple as possible, but not simpler." - Albert Einstein