Background material on work, energy and power.
Physical work and work in physics. dW = F.ds = Fds cosθ. Pulleys and energy. The work energy theorem and the definition of kinetic energy. Kinetic energy and stopping distances. Storing energy: potential energy in a gravitational field or a spring. Conservative and non-conservative forces: examples. Conservation of mechanical energy. Power as the rate of doing work or the rate of converting energy. Units and examples. Using energy and power in mechanics problems. Includes

• The sliding problem
• The loop-the-loop problem
• The hydroelectric dam problem
• Bernouillis's equation
• Centre of mass work
  

Multiplying vectors

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Energy and power