Potential Energy

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# Potential Energy - PowerPoint PPT Presentation

Potential Energy. The energy due to an object’s position or location. M. W= mgy. = PE g. y. M. For PE, choose a “zero-level” (reference level). Floor Desk Earth Etc. The work done by gravity: W g = - mgy. W g = - Δ PE= mgy i - mgy f. M. y. M. EXAMPLE.

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## PowerPoint Slideshow about 'Potential Energy' - ria-mullen

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Presentation Transcript
Potential Energy
• The energy due to an object’s position or location.

M

W=mgy

=PEg

y

M

The work done by gravity: Wg = -mgy

Wg = -ΔPE=mgyi- mgyf

M

y

M

EXAMPLE
• An 86.0kg refrigerator is hauled up a ramp that is 20.0m long and 5.50m high. Find
• Its potential energy relative to the bottom of the ramp.
• The work done by gravity.
Path Independence
• Gravity is path independent: the work done by gravity depends on the object’s displacement, not how it got there.