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Hunus
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1335300188613:dw When does the spring have negative potential energy?

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

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

Hunus
 2 years ago
Best ResponseYou've already chosen the best response.0Because 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?

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

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

mos1635
 2 years ago
Best ResponseYou've already chosen the best response.0when F positive dx is negative??

VincentLyon.Fr
 2 years ago
Best ResponseYou've already chosen the best response.2Draw 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.

VincentLyon.Fr
 2 years ago
Best ResponseYou've already chosen the best response.2dU/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)).

VincentLyon.Fr
 2 years ago
Best ResponseYou've already chosen the best response.2Quote : 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.
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