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.