Apr 22, 2011

Force- Concept and Definition


 Concept and Definition
A force can be thought of as a push or pull acting on a body. Each force  is characterized by its magnitude, direction and point of application to a given body. Body weight, friction, and air or water resistance are all  forces that commonly act on the human body. The action of force 
causes a body’s mass to accelerate. Momentum, a mechanical quantity that is particularly important in situations involving collisions. Momentum may be defined generally as the quantity of motion  that an object possesses. More specifically, linear momentum is the product of an 
object’s mass and its velocity. A static object (with zero velocity) has no momentum; that is, its momentum equals zero. A change in a body’s momentum may be caused by either a change in the body’s mass or a change in its velocity.  

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