1. Measuring Energy and power

2. Measuring Work Work=weight(pounds) X distance(feet)
One foot-pound of work is equal to lifting one pound over one foot.

3. Question
How much work does a 150-pound man accomplish by climbing a 25-foot flight of stairs? Work through the equation with your partner.
work = 150 lbs. x 25 ft
work = 3,750 ft-lbs

4. Hp=weight(lbs)xdistance(ft)/sec x 550
Measuring Power
Power is work done over a certain period of time. Measure of power is HP (horsepower).
Horsepower is energy needed to lift 550 lbs in one second.
Hp=weight(lbs)xdistance(ft)/sec x 550

5. Question
Same Example of man climbing stairs, how many horsepower would he develop in 15 seconds?
hp = 150 lbs x 25ft/15 sec x 550
Hp = 0.45