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Kinetic Energy and the Work/Energy Principle

Kinetic Energy and the Work/Energy Principle. Energy is the ability to do work. Total energy is always conserved. A moving object can do work on another object it strikes. Kinetic energy is the energy of motion…from Greek kinetikos “motion” W net = D KE Translational KE=1/2 mv 2.

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Kinetic Energy and the Work/Energy Principle

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  1. Kinetic Energy and the Work/Energy Principle Energy is the ability to do work. Total energy is always conserved. A moving object can do work on another object it strikes. Kinetic energy is the energy of motion…from Greek kinetikos “motion” Wnet = DKE Translational KE=1/2 mv2

  2. Wnet = DKE • This is the work/energy principle. • The net work done on an object is equal to the change in its kinetic energy. • See Examples 6-4, 6-5, 6-6

  3. Potential Energy • Potential energy is stored energy. • Gravitational potential energy …Peg =mgy • See Example 6-7 • Elastic Potential energy… The spring equation or Hooke’s law ...Pee =1/2 kx2

  4. HOMEWORK… • P174 17-21, 29-32

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