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

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

Hunus Group TitleBest ResponseYou've already chosen the best response.0
\[\frac{kx^{2}}{2}\]
 2 years ago

VincentLyon.Fr Group TitleBest ResponseYou've already chosen the best response.2
So...
 2 years ago

Hunus Group TitleBest 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?
 2 years ago

Hunus Group TitleBest 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?
 2 years ago

VincentLyon.Fr Group TitleBest 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?
 2 years ago

Hunus Group TitleBest 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\[F_x=−\frac{∂U}{∂x}\]
 2 years ago

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

VincentLyon.Fr Group TitleBest 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.
 2 years ago

VincentLyon.Fr Group TitleBest 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)).
 2 years ago

VincentLyon.Fr Group TitleBest 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.
 2 years ago

VincentLyon.Fr Group TitleBest ResponseYou've already chosen the best response.2
Welcome :)
 2 years ago
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