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Answered 2013-06-04 02:58:37

If the sum of all forces on an object is zero, then the object remains in constant,

uniform motion.

'Constant uniform motion' means motion in a straight line at a constant speed.

The physical description of such motion is "constant velocity".

"Rest" is just constant velocity with a speed of zero.

If the sum of all forces on an object is NOT zero, then the object's velocity must

change. The change may consist of speeding up, slowing down, or turning in a

different direction.

If the sum of the forces is in the same direction as the object's motion, then

the object must speed up.

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