Advanced/Notes 6.4
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Transcript of Advanced/Notes 6.4
![Page 1: Advanced/Notes 6.4](https://reader036.fdocuments.net/reader036/viewer/2022062320/558e51c71a28ab4f0a8b45b6/html5/thumbnails/1.jpg)
Section 6.4Potential Energy
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Potential Energy How can I calculate the potential energy?
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Potential Energy Potential Energy depends on an object’s surroundings
Depends on position or configuration
Examples A wound up spring
A stretched elastic band
An object at some height above the ground
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Potential Energy Raising a mass m to a height h
Work done by the external force (gravity)
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Potential Energy
you will also see mgh
Change in PE is important
Be sure to set your original = 0 and be consistent, since we are measuring change in PE
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Potential Energy PE can become KE if the object is dropped
PE is the property of a system as a whole since it depends on external forces
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Example A 1000 kg roller coaster car moves from point 1, to point 2 and then point 3.
(a) What is the gravitational potential energy at 2 and 3 relative to point 1? Take y = 0 at point 1.
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Example (b) What is the change in potential energy when the car goes from point 2
to point 3?
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Spring Potential Energy Potential energy can also be stored in a spring when it is compressed
As it is released, the energy changes to kinetic
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Spring Potential Energy The force required to compress or
stretch a spring:
K is the spring constant, specific to each spring
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Elastic PE The forces increases as the spring is
stretched or compressed
Potential energy of the compressed or stretched spring, measured from its equilibrium position is:
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