Chapter 7 Potential Energy.

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Presentation transcript:

Chapter 7 Potential Energy

Gravitational Potential Energy The higher you are, the more energy you have.

Conservation of Energy

Conservation of Energy (no friction)

Conservation of Energy What is the speed v of the ball at the bottom if the ball is released from rest? h

Example 2 If the ball is initially travelling at v0, what is the speed v of the ball when it is at h/3? h h/3

Find the final speed

Roller Coaster A roller coaster slides down a frictionless track at height h with initial speed v0. Find the speed at A.

Pendulum

Potential energy In a spring

How fast will it go?

Wf Work done by friction (Non-conservative force)

Two Potential Energy? Later in Chapter 11, we will learn another equation for gravitational potential energy: PEG=mgh is only true near the planet’s surface (where g is a constant). Far away the gravitational field gets weak (where g gets smaller) and PEG=mgh is no longer true.