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# Work And Energy

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### Transcript

• 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).