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Work and Energy

Work and Energy. Energy. Kinetic Energy. Kinetic energy – energy of an object due to its motion Kinetic energy depends on speed and mass Kinetic energy = ½ * mass * (speed) 2 KE= ½mv 2 Energy is measured in Joules (J). Kinetic Energy. Work-Kinetic Energy Theorem.

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Work and Energy

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  1. Work and Energy Energy

  2. Kinetic Energy • Kinetic energy – energy of an object due to its motion • Kinetic energy depends on speed and mass • Kinetic energy = ½ * mass * (speed)2 • KE= ½mv2 • Energy is measured in Joules (J)

  3. Kinetic Energy

  4. Work-Kinetic Energy Theorem • The net work done on an object is equal to the change in the kinetic energy of that object • Net work = change in kinetic energy • Wnet=ΔKE

  5. Work-Kinetic Energy Theorem • Speed of the object and kinetic energy increase if work is positive • Speed of the object and kinetic energy decrease if work is negative • Kinetic energy is the work an object can do as it comes to rest • Kinetic energy is the amount of energy stored in an object

  6. Potential Energy • Potential energy – energy associated with an object due to the position of the object • Relative and is based on a frame of reference • Abbreviated PE or U • Measured in Joules (J) • Two main kinds of potential energy • Gravitational and elastic potential energies

  7. Gravitational Potential Energy • Gravitational potential energy (PEg) – potential energy associated with an object due to the position of the object relative to the Earth or some other gravitational source • Based on height from a zero level • Gravitational potential energy = mass * free-fall acceleration * height • PEg=mgh • As objects fall gravitational potential energy is converted to kinetic energy • At the zero level, the object no longer has any gravitational potential energy

  8. Gravitational Potential Energy

  9. Gravitational Potential Energy

  10. Elastic Potential Energy • Elastic potential energy – the potential energy in a stretched or compressed elastic object • Energy of springs and rubber bands • Relaxed length – the length of a spring when no external forces are acting upon it • As the spring is compressed, elastic potential energy is stored in the spring

  11. Elastic Potential Energy • Spring constant – a parameter that expresses how resistant a spring is to being compressed or stretched • Has units of Newtons / meters (N/m) • Elastic potential energy = ½ * spring constant * (distance compressed or stretched)2 • PEelastic= ½kx2

  12. Elastic Potential Energy

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