The Law of Conservation Of Energy

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Presentation transcript:

The Law of Conservation Of Energy

Law of Conservation of Energy: Energy cannot be created or destroyed, only changed from one form into another.

As the ball travels upwards Ek is converted into Ep Imagine a ball being thrown up into the air: As the ball travels upwards Ek is converted into Ep As the ball falls downwards Ep is converted into Ek

This is similar to a pendulum:

On roller coasters the largest hill is always the first. Why is that?

When only conservative forces (like gravity) work on an object, Ek is converted into Ep and vice versa. When external forces like friction are at work then energy is not conserved. Friction converts some energy into heat

The Law of Conservation of Energy: ΔEk = - ΔEp Since no energy is lost, the total initial energy must equal the total final energy: Eki + Epi = Ekf + Epf ½mvi2 + mghi = ½mvf2 + mghf

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A 65 kg snowboarder starts at rest, travels down a hill into a gulley and back up the other side as shown. Find his speed at the top of the 2nd hill. 45 m 25 m