Chapter 5 Pgs. 167-192.

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Presentation transcript:

Chapter 5 Pgs. 167-192

Conservation of Energy Energy cannot be created nor destroyed, it just changes form

Mechanical Energy (ME) The sum of kinetic and all forms of potential energy ME = KE + ∑PE Is conserved in the absence of friction

Conservation of Mechanical Energy KEi + PEgi + PEei = KEf + PEgf + PEef ½mvi2 + mghi + ½kxi2 = ½mvf2 + mghf + ½kxf2

Starting from rest, a child slides down a slide from an initial height of 3.00 m. What is her speed at the bottom of the slide? (her mass is 25.0 kg)

A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 1.9 m/s. What is the initial height of the bob? (mass of bob = 1.0 kg)

A 775 N diver drops from a board 10. 0 m above the water’s surface A 775 N diver drops from a board 10.0 m above the water’s surface. Find the diver’s speed 5.0 m above the water’s surface.

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