how do you know?
and can the normal force onan object ever do work?
W=F*costheta*dCan the centripetal Force ever do work on an object?
Centripetal force can do work. Imagine a table with a string providing the centripetal force for the object moving in a circle. Drop the string through a small hole in the table and pull on the string from below. Pulling on the string does work that increases the kinetic energy of the object.
The normal force of someone sitting on a seesaw seat as it comes down does work to lift the person on the other side of the seesaw.
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