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Energy

Energy. What Is Energy?. The ability to do work The ability to cause change. Stored Energy (PE) Chemical Gravitational Elastic. Used Energy (KE) Sound Thermal Kinetic. Definitions. Newton: Amount of force needed to make 1 kilogram of mass accelerate 1 m/s/s

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Energy

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  1. Energy

  2. What Is Energy? • The ability to do work • The ability to cause change • Stored Energy (PE) • Chemical • Gravitational • Elastic • Used Energy (KE) • Sound • Thermal • Kinetic

  3. Definitions • Newton: Amount of force needed to make 1 kilogram of mass accelerate 1 m/s/s • Joules: energy expended in applying 1 newton through a distance of 1 m

  4. Potential Energy • E of object or system due to position of the body or the arrangement of the particles of the system • Joules: energy expended in applying 1 newton through a distance of 1 m • PE: Mass x Gravity x Height • A skater and board weighing 48 kg is perched on a half pipe 2.5 meters high next to his friend who weighs 52 kg with his board. How much more PE does the heavier boarder have? • Mgh= 48 x 9.8x 2.5 = 1176J 52 x 9.8 x 2.5= 1274J 98J

  5. Kinetic Energy • work needed to accelerate a body of a given mass from rest to its stated velocity • KE = ½ mass x velocity2 • How much energy does a bicycle and rider weighing 64 kg moving 18 kmph use? • ½ mv2 = ½ 64 x (18) 2 = 32 x 324 = 10,368 J

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