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Work and power (Work (Needs energy (Work is done by foces on objects…
Work and power
Work
The transfer of energy by applying a force over a distance
Ex. Pulling an object
Needs energy
Work is done by foces
on
objects
Distance has to be in direction of the force
Distance cannot be a right angle to the force
Work is not done if velocity is constant (recall F=ma)
Force x Distance
Measerments
Work (W)
Joules
Force (F)
Newtons
Distance (d)
Meters
Time (t)
Seconds
Power
The rate at which work is done
W / t
(F x d) / t
Joules/second or Watts
