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Work and Power

Work and Power. A ssignment. I will number you into groups. You will be working in chapter 8 of the book. Your group number will represent your section of the chapter. Expectations. You will be presenting your section to class.

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Work and Power

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  1. Work and Power

  2. Assignment • I will number you into groups. • You will be working in chapter 8 of the book. • Your group number will represent your section of the chapter.

  3. Expectations • You will be presenting your section to class. • The method of presentation is your choice. (notes, demonstrations, vocab game…) • Your group will also generate 5 test questions (multiple guess / calculations)

  4. Work • Work – a force applied over a distance • W= F(d) • units: F=Newton d=meter W= Joules

  5. W = F x d Therefore: You must have MOTION in order to have work… something has to change position

  6. Power • Power – the rate at which work is done • Power = Work/time • Unit is Watt (joule/second)

  7. Example Problems If a 450 N boulder is dropped 2.4 m in 25 seconds, how much power is exerted on the object?

  8. Example Problems How much work is done by a toy car with an applied force of 12 N which is moved for 39 m?

  9. The weight lifter lifted a mass of 100 kg (barbell) over her head in 5.21 seconds. Approximately how much power did she generate in raising the barbell?

  10. Example Problems A mechanic used a hydraulic lift to raise a 12,054 N car 1.89 m above the floor of a garage. It took 4.75 s to raise the car. What was the power output of the lift?

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