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Chapter 12

Chapter 12. Work, Energy and Power. Energy. Is the ability to do work Expressed in Joules ( dzuls ) Forms of energy: Mechanical , Heat, light, and Chemical Energy. POTENTIAL ENERGY. Gravitational Energy Elastic Potential Energy. Gravitational Potential Energy.

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Chapter 12

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  1. Chapter 12 Work, Energy and Power

  2. Energy • Is the ability to do work • Expressed in Joules (dzuls) • Forms of energy: Mechanical, Heat, light, and Chemical Energy

  3. POTENTIAL ENERGY • Gravitational Energy • Elastic Potential Energy

  4. Gravitational Potential Energy • Is the energy possessed by a body by virtue of its position PE = mgh

  5. Sample Problem 1 • A 75.0kg child climbs a 6.00m long slide. What is the potential energy of the child? Given: m = 75.0kg, h = 6.00m, g = 9.8m/s2 Required: PE = ? Sol’n: PE = mgh = (75kg) (6m) (9.8m/s2) = 4 410 kg m2/s2 = 4 410 J

  6. Sample Problem 2 The potential energy of an apple is 6.00 joules. The apple is 3.00-meters high. What is the mass of the apple? Given: h = 3.00m, PE =6.00 J, g = 9.8m/s2 Required: m = ?

  7. Elastic Potential Energy • Is the energy possessed by a spring or rubber band when it is stretched or compressed

  8. Kinetic Energy • Is the energy possessed by a body because of its motion KE = ½ mv2

  9. Sample Problem 3 What is the kinetic energy of a 2,000 kilogram boat moving at 5 m/s? Given: m = 2,000kg, v = 5m/s Required: KE = ? Sol’n: KE = ½ mv2 = ½ (2000kg) (5m/s)2 = 1000kg (25m2/s2) = 25,000 J

  10. Sample Problem 4 What is the velocity of an 500-kilogram elevator that has 4,000 joules of energy? Given: m = 5,000kg, KE = 4,000 J Required: v = ?

  11. Sample Problem 5 • What is the height of a raised object where its mass is 25kg and the potential energy is 34 J?

  12. Sample Problem 6 What is the mass of an object where its velocity is 25m/s and its kinetic energy is 38.03 J?

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