1. The Work Energy Principle Part 6
By: Heather Britton

2. Power Power like velocity and acceleration is a rate
Rate means divided by time
Power is defined as the amount of work done in a given time period
It can also be the energy transferred in a given time period

3. Power P = W/t t = time (measured in seconds)
W = work (measured in Joules)
P = power (measured in Watts)

4. Power
The Watt is defined as one Joule of work done (or energy transferred) in one second
Another common measurement for power is the horsepower (hp)
1 hp = 746 W
For physics power must be in Watts

5. Power
P = W/t
P = FΔx/t
v = Δx/t
P = Fv

6. Example 11
How much power does a person produce when lifting a 50 kg package to a height of 2 m in 5 s?

7. Example 12
How long will it take a 75 kg rock climber to reach a height of 50 m if he can produce an average power output of 100 W?