Thursday, May 8, 2008

the first lesson - The force


One of the most important units in physics is FORCE.
So let’s understand what is it?




Force is that which changes a body’s state or uniform motion in a straight line.
Ex: When you push or pull on object in a certain direction you exert a force on that object.

For instance gravity is a force which exerts on every object on the earth. In order to lift the object from the ground you need to exert an upward force that is greater than the weight of the object.

Any force is specified by its magnitude, direction and point of applying.

Force is a vector quantity. The addition and substraction of forces are the same as the addition and substraction of vectors.

The unit of force in SI system is Newton.
The unit of force in Gauss system is Dyne
1 N (Newton) = 100000 dynes

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