WORK AND POWER!
W = ∫ F·dr
This is the basic definition
of work!!!!
For a constant force, the force F
can be taken out of the integral, to get the result
W = F·Δr
Note that since v = Δr/Δt
we can also write W = F·vΔ t.
Note that neither of the two
forces acting are doing any work!
The delivered power is the
rate at which work is done. For example the power P
delivered by a force F to a body traveling at velocity v
is F·v.
The kinetic energy can be used
to keep track of the work done by forces on a body: WF
= ΔK
Notice that if we introduce the
magnitude of the momentum, p = mv, we can also write the
kinetic energy as K = p2/(2m)
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