Measuring Energy and power

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Presentation transcript:

Measuring Energy and power

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

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

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

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

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