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![[Post New]](/templates/default/images/icon_minipost_new.gif) 28 Apr 2008 20:26:51 IST
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laws of motion
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28 Apr 2008 22:22:52 IST
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luk here :
http://www.goiit.com/chapters/tutorial/physics/newtons_law_com.htm
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it is not important where u stand, but in which direction u are moving |
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28 Jun 2008 22:46:43 IST
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1st law : A body continues in its state of rest or uniform motion,unless acted upon by an external force.
2nd law :the rate of change of momentum is directly proportional to the force acting on it (or) simply F=ma
from the above definition, we have
F=dp/dt
F=d(mv)/dt
if m is a constant
F=m*dv/dt
F=ma
3rd law :for every action, there is an equal and opposite reaction.
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29 Jun 2008 00:03:52 IST
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First law:A body continues in its state of rest or uniform motion,unless and until an external unbalanced force acts on it.
2nd Law:The second law of motion states that the rate of change of momentum of an object is directly proportional to the applied unbalanced force and it is in the direction of force.
OR
This law states that when a force is applied on a body then the acceleration produced is directly proportional to the applied force and inversely proportional to the mass of the body.
a is proportional to F/M
=>F is proportional to ma
=>F=K m a
If K=1
=>f=ma
Derivation from momentum:
Suppose an object of mass "m" is moving along with the initial velocity "u".It is uniformly accelerated to velocity "v" in "t" seconds. The initial and the final momentum of the object is .
The change in momentum is proportional to P1-P2
The change in momentum is proportional to mv-mu
The change in momentum is proportional to m(v-u)
The rate of change in momentum is proportional to m(v-u)/t
The applied force F is proportional to m(v-u)/t
=>F=Km(v-u)/t
=>F=Kma
Derivation of first law from the second Law
First law states that A body continues in its state of rest or uniform motion,unless and until an external unbalanced force acts on it.
If F=0
=>ma=0
=>m(v-u)/t=0
=>(v-u)/t=0
=>v-u=0
=>v=u
If u=0 then u=v=0.
Third law of motion:for every action, there is an equal and opposite reaction,the action and the reaction are equal in magnitude but opposite in direction that means they act on different bodies.
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God does not care about our mathematical difficulties. He integrates empirically. ~~~Albert Einstein (1879-1955)~~~~
To divide a cube into two other cubes, a fourth power or in general any power whatever into two powers of the same denomination above the second is impossible, and I have assuredly found an admirable proof of this, but the margin is too narrow to contain it.~~~Pierre de Fermat (1601-1665)~~~
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1 Jul 2008 23:06:30 IST
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Take a look at
http://physicsgoeasy.blogspot.com/2008/04/mechanics-index.html
Good material
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