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Chapter 5 Pgs. 167-192.

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Presentation on theme: "Chapter 5 Pgs. 167-192."— Presentation transcript:

1 Chapter 5 Pgs

2 OBJECTIVES Relate the concepts of energy, time, and power.
Calculate power in two different ways.

3 Power The rate at which work is done The rate of energy transfer
Three variations of the equation: W Fd P = P = P = Fv ∆t ∆t

4 Power SI unit for power is the watt (W) Named after James Watt who
perfected the steam engine. Horsepower (hp) is also used 1 hp = 746 W Machines with different power ratings will do the same amount of work in different time intervals

5 A 193 kg curtain needs to be raised 7
A 193 kg curtain needs to be raised 7.5 m, at a constant speed, in as close to 5.0 s as possible. The power ratings for three motors are listed as 1.0 kW, 3.5 kW, and 5.5 kW. Which machine is the best for the job?

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