I was usually told that in a uniform circular motion the work is 0 because the force is every instant perpendicular to the displacement. However, studying the motion i noticed that there is a force acting on the moving object that is always parallel to the displacement and perpendicular to the radius to the circumference ( it's the force that continuously changes the velocity vector). Why it doesn't do work ?
closed as unclear what you're asking by stafusa, John Rennie, sammy gerbil, ZeroTheHero, Yashas Sep 22 '18 at 13:25
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The force is not tangential. It is always radially inward.
Thus, it is perpendicular to the velocity vector and does no work.
(Image source : Wikipedia)
Note that the direction of force in this image is exactly opposite to the radius vector.