Monday
December 22, 2014

Homework Help: physics

Posted by Hannah on Sunday, January 20, 2008 at 10:24pm.

A 10-kilogram body is constrained to move along the x-axis. The potential energy U of the body in joules is given as a function of its position x in meters by:
U(x) = 6x^2 - 4x + 3
The force on the particle at x=3 meters is?

Here was my thinking.... U=-W. So, W(x) = -6x^2 + 4x - 3. W also = Fxcos(theta). So I plugged in x=3 to all x's to get Fcos(theta) = -3, so the force would be 3N to the left. Why is this incorrect????? Am I thinking way off track???

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