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work done equation for a force
work done = resultant component of force in direction of motion • distance travelled in direction of motion
work done against gravity
mgh
work done against friction
frictional force • distance travelled
what’s another way to write work done?
change in kinetic energy
what’s important before calculating a particles potential energy?
choosing a height at which potential energy = 0
conservation of energy equation
initial energy = final energy or:
(driving force • distance) + initial KE + initial GPE = (resistance or friction • distance) + final KE + final GPE
what’s another way to think about conservation of energy?
the magnitude of the decrease in one form of energy must be the same magnitude as the increase in another, i.e. KE loss = GPE gain
power equation
P = Fv
