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Chapter 14 Lesson 1

Chapter 14 Lesson 1. “Work and Power”. I. Work. A. Books in hand Demo B. Def – the product of force and distance 1. Not…a job, chores, school. 2. Formula: Work = Force x Distance 3. Force is in Newtons 4. Distance is in meters 5. Work is in Joules.

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Chapter 14 Lesson 1

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  1. Chapter 14 Lesson 1 “Work and Power”

  2. I. Work A. Books in hand Demo B. Def – the product of force and distance 1. Not…a job, chores, school. 2. Formula: Work = Force x Distance 3. Force is in Newtons 4. Distance is in meters 5. Work is in Joules

  3. 6. Ex: Your backpack is full and weighs 30 Newtons. You lift it from the floor to the shelf, a distance of 1.5 meters. How much work is done on the backpack? W = F x D 30 N x 1.5 m = ? 45 Joules

  4. 7. A backpack has a weight of 35 N and a student who is 1.8 meters tall has it on her back. How much work is the student doing on the backpack? W = F x D 35 N x 0 meters = 0 Joules

  5. 8. A carpenter lifts a 45-kg beam 1.2 meters. Approximately how much work is done on the beam? (be careful!!! Look at your units) Hint … 1 kg = 9.8 N 45 kg x 9.8 N/kg = 441 Newtons 441 N x 1.2 meters = =529.2 Joules

  6. II. Power A. Def – Rate of doing work. 1. 2 variables a. Work and Time B. Formula 1. Power = Work (J) / Time (s) a. Unit is the Watt (W) b. A 60-watt light bulb requires 60 J per second.

  7. C. Ex: A machine puts forth 400 J of work in 0.25 seconds. What is the amount of power of the machine? P = W / T P = 400 J = 1600 Watts 0.25 Sec

  8. D. A similar machine exerts 500 J of work with 1400 Watts of power. What is the time it takes this machine to do its job? T = W / P T = 500 J = 0.36 sec 1400 Watts

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