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**Unformatted text preview: **Potential General Physics I Mechanics Racquetball Striking a Wall Energy Physics 140 Mt. Etna Stewart Hall Summary • Kinetic energy: • Gravitational potential energy: 2 2 mv KE = mgy GPE = • Elastic potential energy: • Conservation of energy: • Work of non-conservative forces: W non-cons 2 2 kx EPE = f f f cons non i i i EPE GPE KE W EPE GPE KE + + = + + +- Terminology • Potential force = Conservative force • Net work = Total work = Scalar sum of all work • Net force = Total force = Vector sum of all forces Force and Potential Energy • Work of a conservative force can be expressed as a change in potential energy: • Work of that force over a small (infinitesimal) isplacement PE PE PE W f i cons ∆- =- = displacement ∆ s = ∆ x i is • So, can write for infinitesimal displacements • Taking the limit ∆ x → 0: x F i x F s F W x cons ∆ = ∆ ⋅ = ∆ ⋅ = ˆ r r r x PE F PE x F x x ∆ ∆- = ∆- = ∆ or dx x dPE x F x ) ( ) (- = Force and Potential Energy...

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