Units of force are units of mass multiplied by units of acceleration. In the metric system, the most common unit of force is the Newton(N), which is the amount of force required to accelerate 1 kg of mass at 1 m/s2.Because a number of forces act simultaneously in most situations,
constructing a free body diagram is usually the first step when analyzing the effects of forces on a body or system of interest. A free body is any object, body, or body part that is being focused upon for analysis. When all acting forces are balanced, or cancel each other out, the net force is
zero, and the body remains in its original state of motion, either motionless or moving with a constant velocity. When a net force is present, the body moves in the direction of the net force and with an acceleration that is proportional to the magnitude of the net force. Units of momentum are units of mass multiplied by units of velocity, expressed in terms of kg m/s. Because velocity is a vector quantity,momentum is also a vector quantity and is subject to the rules of vector composition and resolution. When a head-on collision between two
objects occurs, there is a tendency for both objects to continue moving in the direction of motion originally possessed by the object with the greatest momentum
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