Sunday, February 8, 2009
Newton's Three Laws of Motion
from http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion / http://hyperphysics.phy-astr.gsu.edu/hbase/Newt.html :
The first law is the law of inertia. Newton's first law states that if the vector sum of all forces (also known as the net force) acting on an object is zero, then the state of motion of the object does not change.
- An object that is not moving will not move until a net force acts upon it. - The energy from the force will cause the object to move.
- An object that is moving will not change its velocity (accelerate) until a net force acts upon it. - Moving objects will always eventually stop moving. This is because friction (a force; see post on forces) is acting on the object. Without friction, moving objects would never stop moving or even slow down.
The second law is that the change of the momentum of a body is proportional to the impulse impressed on the body and happens along the straight line on which that impulse is impressed.
This means the force is proportional to the acceleration of the body and the second law can be represented by the formula F = ma.
The third law is for every action there is an equal and opposite reaction.
A mind-map of Newton's laws of motion:
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