Homework Help: Physics

Posted by rose on Thursday, November 11, 2010 at 7:07pm.

Which of the following forces does NOT have a zero work done on the object.

Choices
The normal force on a box that slides across a horizontal level floor.
The weight on a box that slides across a horizontal level floor.
The normal force on a box that slides down an inclined plane.
The weight on a box that slides down an inclined plane.
Actually all of the above describe forces that do zero work

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