An unbalanced force acting on an object changes its speed or path of
motion, or both. If the force acts toward a single center, the object's
path may curve into an orbit around the center.
NSES Content Standard B
Physical Science: Motions and forces Grades 5-8, page 154 An object that is not being subjected to a force will continue to move at a constant speed and in a straight line. NSES Content Standard B
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