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Chapter 15

Chapter 15. Energy Assignments 15.1 Math Skills 1-3 p 448; AQs 1-9 p452 15.2 Math Skills 1-3 p 458; AQs  1-6 & 9-10. 15.1 Learning Targets for Energy and its Forms. Describe the relationship between work and energy

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Chapter 15

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  1. Chapter 15 Energy Assignments 15.1 Math Skills 1-3 p 448; AQs 1-9 p452 15.2 Math Skills 1-3 p 458; AQs  1-6 & 9-10

  2. 15.1 Learning Targets for Energy and its Forms • Describethe relationship between work and energy • Calculate the kinetic energy of an object given the objects mass and velocity • Analyzehow potential energy is related to an object’s position andgive examples of gravitational and elastic potential energy • Solve equations that relate an object’s gravitational potential energy to its mass and height • Give examplesof the major forms of energy

  3. MP 1.A 70.0-kilogram man is walking at a speed of 2.0 m/s. What is his kinetic energy? • KE = ½ m*v2 • KE = 0.5 * 70.0 kg * (2.0 m/s)2 • KE = 0.5 * 70.0 kg * 4.0 m/s • KE = 140 J

  4. MP 2.A 1400-kilogram car is moving at a speed of 25 m/s. How much kinetic energy does the car have? • KE = ½ m*v2 • KE = 0.5 * 1400 kg * (25 m/s)2 • KE = 0.5 * 1400 kg * 625 m/s • KE = 437,500 J

  5. MP 3.A 50.0-kilogram cheetah has a kinetic energy of 18,000 J. How fast is the cheetah running? (Hint: Rearrange the equation to solve for v.) • KE = ½ m*v2 • 18,000 J = 0.5*50.0 kg*v2 • 18,000 J = 25*v2 (divide both sides by 25) • 720 J = v2 (take the square root of both sides) • v = 26.8 m/s

  6. 1. Describe the relationship between work and energy. • Energy is the ability to do work, and work is the transfer of energy

  7. 2. How is the kinetic energy of an object determined? • KE = ½ m*v2

  8. 3. What factors determine the gravitational potential energy of an object? • Its mass • The acceleration due to gravity • Its height • PE = m*g*h

  9. 4. Give an example of each of the major forms of energy. • Chemical – wood, gasoline • Electrical – ipod • Mechanical – bouncing ball • Electromagnetic – light • Nuclear – nuclear power plants • Thermal – molten steel, fire

  10. 5. When you heat a pot of water over a flame, what form of energy is added to the water? • Thermal

  11. 6. Applying Concepts  What kind of energy is represented by an archer stretching a bow string? • Elastic potential energy

  12. 7. Applying Concepts  Can an object have both kinetic energy and potential energy at the same time? Explain • Yes, KE & PE are not mutually exclusive • E.g. a falling leaf

  13. 8. A 60.0-kg person walks from the ground to the roof of a 74.8-m-tall building. How much gravitational potential energy does she have at the top of the building? • PE = m*g*h • PE = 60.0 kg*9.8m/s/s*74.8m • PE = 44,000 J

  14. 9. A pitcher throws a 0.145 kg-baseball at a velocity of 30.0 m/s. How much kinetic energy does the ball have? • KE = ½ m*v2 • KE = 0.5*0.145 kg*(30.0 m/s)2 • KE = 0.5*0.145 kg*900 m/s • KE = 65.3 J

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