# 3work - Work In order to accomplish work on an object there...

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1 Work In order to accomplish work on an object there must be a force exerted on the object and it must move in the direction of the force. When a force does no work A force with no motion or a force perpendicular to the motion does no work

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2 Work Work describes a transfer of energy Always talk about the work done on an object by a force work is a type of energy, so it has the same units (Joules, etc.) as kinetic energy Don’t confuse Work with Weight (both use symbol W ) For one dimensional motion, with a constant force F: Fd W Work done by force F on object = (Force)(displacement of object)
Example: Negative work means (a) the kinetic energy of the object increases. (b) the applied force is variable. (c) the applied force is perpendicular to the displacement. (d) the applied force is opposite to the displacement. (e) nothing; there is no such thing as negative work. Example: If work is done on a body, the body must (a) accelerate. (b) be in equilibrium. (c) have no force. (d) have no friction force.

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3work - Work In order to accomplish work on an object there...

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