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.
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Benchmark 4F The Physical Setting: Motion
Grades 6-8, page 90
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.