Question: If you push on a heavy box that is at rest, you must exert some force to start its motion. However, once the box is

If you push on a heavy box that is at rest, you must exert some force to start its motion. However, once the box is sliding, you can apply a smaller force to maintain that motion. Why?

Hoger Violiet M Va liey CA Uhiversty Science ocs, 1982

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