If conservation energy is loss of gravitional potential energy (energy once store in the object), will heat loss also part of conservation energy?
If conservation energy is loss of gravitional potential energy (energy once store in the object), will heat loss also part of conservation energy?
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If conservation energy is loss of gravitional potential energy (energy once store in the object), will heat loss also part of conservation energy?
Transcribed Image Text:077
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Figure 7.16 A person pushes a crate up a ramp, doing work on the crate. Friction and gravitational force (not shown) also do work on the crate; both
forces oppose the person's push. As the crate is pushed up the ramp, it gains mechanical energy, implying that the work done by the person is greater
than the work done by friction.
Consider Figure 7.16, in which a person pushes a crate up a ramp and is opposed by friction. As in the previous section, we
note that work done by a conservative force comes from a loss of gravitational potential energy, so that We = -APE!
Substituting this equation into the previous one and solving for Wne gives
Wnc = ΔΚΕ + ΔΡΕ.
(7.57)
This equation means that the total mechanical energy (KE+ PE) changes by exactly the amount of work done by
nonconservative forces. In Figure 7.16, this is the work done by the person minus the work done by friction. So even if energy is
not conserved for the system of interest (such as the crate), we know that an equal amount of work was done to cause the
change in total mechanical energy.
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