Work And Energy
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  • 1. Colegio San Patricio Physics WORK AND ENERGY Mrs. Nora Guerra Mrs. Martha Fuentes
  • 2. Work
    • Work is done whenever a force (F) is exerted and whenever there is a displacement (s).
    • The amount of work done is proportional to both, the force and displacement.
    • (W=F*s)
    • Work is measured in newton-meters or Joules.
  • 3. Formula for work W F d W= work F= force d= distance
  • 4. Energy
    • Ability to do work
    • No energy: no work
    • Measured in Joules.
  • 5. Energy Examples
    • Energy:
    • In a raindrop: .0001 Joules
    • Needed to press a key: .01 Joules
  • 6. Kinetic enegy
    • It´s the energy of motion.
    • An object with motion- whether it´s vertical or horizontal- has kinetic energy.
  • 7. Kinetic energy formula
    • Kinetic energy equals the massof the moving object times the square of that object´s velocity, multiplied times the constant ½.
    • KE= 1/2 mv ²
  • 8. Potential energy
    • It´s the energy that can result in the exertion of a force over a distance. It is stored energy.
    • Most common= Gravitational PE
  • 9. Potential energy formula
    • Potential energy (joules) =
    • mass (kg)*g(m/s 2)* height (m).