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There are two basic kinds of motion. If an object moves at a constant speed, covering the same distance each second without changing direction this is called uniformed motion. If the speed or direction of the object changes, then it is in accelerated motion. N ....

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.... surface. This resistance or friction will slow down the moving object and eventually bring it to a stop. Friction exists between any two surfaces that touch, slide, or roll on one another. Any change in an object’s speed is called acceleration. An increase in speed is called positive acceleration, while a decrease in speed is called negative acceleration, or deceleration. Acceleration can also mean a change in direction as well as in speed. A force is needed to change the direction of an object, so a change in force can also mean a change in direction as well as a change in speed. According to Newton’s Second Law of Motion, the change in di ....