Energy enables an object to do work. Work is done when A. no force is put on an object, and the object does not move in any direction. B. a force is put on an object, but the object does not move in any direction. C. a force is put on an object, and the object moves in the direction of the force. D. no force is put on an object, but the object moves at varying speeds in a random direction.

Asimply means that over time there was some sort of change.

How would doubling the made of an object change the objects potential energy

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.