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Unformatted text preview: me work if he lifts
the backpack a height h. Does the Earth work on the Moon?
The answer is
direction of the
force of gravity is
perpendicular to the
displacement at any
instant Work done by a Varying Force The work done by a variable
force in moving an object between
two points is equal to the area
under the (
) versus ( )
curve between those two points. Work Done by a Spring Force
To hold a spring either
compressed or stretched
an amount from its
relaxed length requires a
force that is directly
proportional to The spring exert a force
in the opposite direction
k is the spring constant
describing its stiffness Important e...
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