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

M

W=mgy

=PEg

y

M

slide3

The work done by gravity: Wg = -mgy

Wg = -ΔPE=mgyi- mgyf

M

y

M

example
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
Path Independence
  • Gravity is path independent: the work done by gravity depends on the object’s displacement, not how it got there.
  • HW: Read pp. 127-130
  • Do 19-29