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CHAPTER NEW CHAPTER Work and Energy the BIG idea Energy is transferred when a force moves an object. 13.1 Work is the use of force to move an object. 13.2 Energy is transferred when work is done. 13.3 Power is the rate at which work is done. CHAPTER OUTLINE CHAPTER RESOURCES 13.1 CHAPTER HOME KEY CONCEPT Work is the use of force to move an object. Work is done by a force that acts in the same direction as the motion of an object. Work = Force • distance VOCABULARY work joule applied force part of force not doing work applied force object part of force object doing work CHAPTER RESOURCES direction of motion direction of motion SECTION OUTLINE 13.1 CHAPTER HOME KEY CONCEPT Work is the use of force to move an object. Work is done by a force that acts in the same direction as the motion of an object. Work = Force • distance VOCABULARY work joule SIMUALATION Determine how much work is done by lifting weights of different masses. CHAPTER RESOURCES SECTION OUTLINE 13.2 CHAPTER HOME KEY CONCEPT Energy is transferred when work is done. The amounts of potential energy and kinetic energy in a system or process may vary, but the total amount of energy remains unchanged. GPE = mgh 1 mv2 KE = 2 ME = PE + KE 1 potential energy kinetic energy mechanical energy Top of Ramp At the top of the ramp, the skater’s mechanical energy is equal to her potential energy because she has no velocity. VOCABULARY 100% PE conservation of energy CHAPTER RESOURCES SECTION OUTLINE 13.2 CHAPTER HOME KEY CONCEPT Energy is transferred when work is done. The amounts of potential energy and kinetic energy in a system or process may vary, but the total amount of energy remains unchanged. GPE = mgh 1 mv2 KE = 2 ME = PE + KE 2 Halfway Down Ramp As the skater goes down the ramp, she loses height but gains speed. The potential energy she loses is equal to the kinetic energy she gains. 50% 50% PE KE VOCABULARY potential energy kinetic energy mechanical energy conservation of energy CHAPTER RESOURCES SECTION OUTLINE 13.2 CHAPTER HOME KEY CONCEPT Energy is transferred when work is done. The amounts of potential energy and kinetic energy in a system or process may vary, but the total amount of energy remains unchanged. GPE = mgh 1 mv2 KE = 2 ME = PE + KE 3 potential energy kinetic energy mechanical energy Bottom of Ramp As the skater speeds along the bottom of the ramp, all of the potential energy has changed to kinetic energy. Her mechanical energy remains unchanged. VOCABULARY 100% KE conservation of energy CHAPTER RESOURCES SECTION OUTLINE 13.2 CHAPTER HOME KEY CONCEPT Energy is transferred when work is done. The amounts of potential energy and kinetic energy in a system or process may vary, but the total amount of energy remains unchanged. GPE = mgh 1 mv2 KE = 2 ME = PE + KE VOCABULARY potential energy kinetic energy mechanical energy conservation of energy VISUALIZATION CLASSZONE.COM Observe how potential and kinetic energy are transferred on an amusement park ride. CHAPTER RESOURCES SECTION OUTLINE 13.3 KEY CONCEPT CHAPTER HOME Power is the rate at which work is done. Power can be calculated from work and time. Power = Work time VOCABULARY power watt horsepower Power can be calculated from energy and time. Power = Energy time Power is measured in watts (W) and sometimes horsepower (hp). CHAPTER RESOURCES SECTION OUTLINE 13.1 CHAPTER HOME KEY CONCEPT Work is the use of force to move an object. I. Work is the use of force to move an object. A. Force is necessary to do work. VOCABULARY work joule 1. Force, Motion, and Work 2. Calculating Work B. Objects that are moving can do work. CHAPTER RESOURCES KEY CONCEPT SUMMARY 13.2 KEY CONCEPT CHAPTER HOME Energy is transferred when work is done. II. Energy is transferred when work is done. A. Work transfers energy. B. Work changes potential and kinetic energy. 1. Calculating Gravitational Potential Energy 2. Calculating Kinetic Energy VOCABULARY potential energy kinetic energy mechanical energy conservation of energy 3. Calculating Mechanical Energy C. The total amount of energy is constant. 1. Conserving Mechanical Energy 2. Losing Mechanical Energy 3. Forms of Energy CHAPTER RESOURCES KEY CONCEPT SUMMARY 13.3 KEY CONCEPT CHAPTER HOME Power is the rate at which work is done. III. Power is the rate at which work is done. A. Power can be calculated from work and time. 1. Calculating Power from Work VOCABULARY power watt horsepower 2. Horsepower B. Power can be calculated from energy and time. 1. Calculating Power from Energy 2. Everyday Power CHAPTER RESOURCES KEY CONCEPT SUMMARY CHAPTER HOME Chapter Resources Image Gallery Review Game Animations Click here to review chapter images and animations Play a fun interactive review game Link to all the McDougal Littell Science animations Click on the items below to access resources on Audio Readings Resource Centers Hear chapter audio readings Get more information on select science topics Content Review Standardized Test Practice Review key concepts and vocabulary 4 % CE 7 1 0 2 6 5 4 3 9 8 3 2 . Math Tutorial M+ M– M CC ON/C 5 1 CLASSZONE.COM Review math concepts BACK TO CHAPTER Practice state standardized tests