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HunusBest ResponseYou've already chosen the best response.0
dw:1335300188613:dw When does the spring have negative potential energy?
 one year ago

VincentLyon.FrBest ResponseYou've already chosen the best response.2
Good question! Do you know the expression of this type of potential energy?
 one year ago

HunusBest ResponseYou've already chosen the best response.0
Well, when you have the equation \[F_x=\frac{\partial U}{\partial x}\] what force does F_x represent?
 one year ago

HunusBest ResponseYou've already chosen the best response.0
Because if F is the force of the spring, then wouldn't it be positive on the third picture? And if it was positive wouldn't dudx have to be negative?
 one year ago

VincentLyon.FrBest ResponseYou've already chosen the best response.2
Your problem is not asking about a negative force, but about a negative energy. For which x can ½kx² be negative?
 one year ago

HunusBest ResponseYou've already chosen the best response.0
I'm reading through a book on classical mechanics and I'm having a difficult time understanding when the force is positive\[F_x=−\frac{∂U}{∂x}\]
 one year ago

mos1635Best ResponseYou've already chosen the best response.0
when F positive dx is negative??
 one year ago

VincentLyon.FrBest ResponseYou've already chosen the best response.2
Draw the function U(x)=½kx² For what values of x is the tangent to the curve positive/negative ? As Fx = dU/dx, you will know the sign of Fx.
 one year ago

VincentLyon.FrBest ResponseYou've already chosen the best response.2
dU/dx is the derivative of U with respect to x. Its value is the gradient of the tangent to the curve at point (x,U(x)).
 one year ago

VincentLyon.FrBest ResponseYou've already chosen the best response.2
Quote : Well, when you have the equation Fx=−∂U/∂x what force does F_x represent? Answer : it reprensents the force exerted by the spring on the block.
 one year ago
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