I think you know the first law. In case you need, here are all three.

First Law:
A body tends to stay in the resting state or tends to move with a uniform velocity unless an external force is applied on it.

Second Law :
The net external force on a body is equal to the mass of that body times its acceleration; F = ma. Alternatively, force is proportional to the time derivative of momentum.

Third Law :
Every Action has an equal and opposite reaction.

Here are some links for more Information :
http://en.wikipedia.org/wiki/Newton's_laws_of_motion
http://csep10.phys.utk.edu/astr161/lect/history/newton3laws.html
http://hyperphysics.phy-astr.gsu.edu/hbase/Newt.html
Source(s):
Studied it ....

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Newton's 2nd Law (The Law of Momentum): Force equals mass times acceleration (F=m*a)

Newton's 3rd Law (The Law of Reciprocal Actions) : For every action there is an equal and opposite reaction
Source(s):
http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion

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I will give you definitions for all the 3 laws ::::::

*** The First Law of Newton :

If no resultant force ( unbalanced force ) acts on particular body, then it must be stationary or moving in a straight line path with an uniform or constant speed ( velocity ).

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So, the definition for the 'Force' is ,

If there is something that can change the condition of motion on a straight line path with an uniform speed or condition of stationary that is called a Force.

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*** The Second Law of Newton :::

If a resultant force (unbalanced force) acts on a body, there is a change of momentum along the direction of the resultant force, and the resultant force is directly proportional to the rate of change of momentum.

#### This is used to derive the formula :::: F = ma
where ,,,,,,,,
F is the resultant force
m is the mass of the body
a is the acceleration.

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*** The Third Law of Newton :::

If a body exerts a force on another body ( we call this force as the " action" ), then the second body exerts the same force on the first body in the opposite direction ( we say this force as the "reaction" )

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https://ushistoryburns.wikispaces.com/file/view/newton.jpg

http://www.grc.nasa.gov/WWW/K-12/rocket/Images/newton1r.gif
http://www.grc.nasa.gov/WWW/K-12/airplane/Images/newton2.gif
http://www.grc.nasa.gov/WWW/K-12/rocket/Images/newton3r.gif
Source(s):
my own physics experience and knowledge !!!!

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