A potential energy function can be defined for the

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Unformatted text preview: done by the net force on an object as it moves between two points is equal to the change in its kinetic energy. W Net = ∆K Conservative Forces Conservative forces are defined to be those forces in which the work done by them does NOT depend on the path, only on the endpoints. Work Done by Two Conservative Forces W = −mg ∆y Gravitational Force Spring Force §1 1· W1→ 2 = GM E m¨ − ¸ ¸ ¨r © 2 r1 ¹ W1→ 2 = − 1 2 k ( x 2 − x12 ) 2 (near Earth) (general expression) Three ways of looking at it N W W Conserva>on of mechanical energy Ui + Ki = Uf + Kf è༎  ΔK = – ΔU = mgh Conservative Forces and Potential Energy MAIN POINTS Potential Energy The change in potential energy that is associated with a specific conservative force as an object moves between two locations is defined as negative the work done by that force between those two locations. A potential energy function can be defined for the object and the particula...
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