Home » Ask & Discuss » Physics. » Modern Physics « Back to Discussion

Modern Physics

Cool goIITian

Joined:	16 Feb 2008
Post:	61

19 Feb 2008 11:18:01 IST

0 People liked this

525

prove newtons second law is the real law

None

is the second law the real law of all

Share this article on:

Comments (2)

Rohan

Blazing goIITian

Joined: 3 Jun 2007

Posts: 696

19 Feb 2008 11:30:26 IST

Like 3 people liked this

it's called so bcoz.........newton's first and second laws can be derived from it.................

frm 2nd law...........F=ma
so

if F=0 then and only then a=0.............which is first law !!

also frm 2nd law

dP/dt=F

consider a 2 body system

F12=dP1/dt (force on 1st body due to 2nd body).............(1)

F21=dP2/dt (force on 2nd body due to 1st body).............(2)

adding (1) and (2)

F12+F21=d(P1+P2)/dt

but if no external force is acting then change in momentum of system is zero so

F12= - F21 (third law)

hope it helps !!.....cheers

Bipin Dubey

Forum Expert

Joined: 23 Jan 2007

Posts: 7942

19 Feb 2008 11:58:54 IST

Like 0 people liked this

Good work netkid07.

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team