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The Meaning of Work

The Meaning of Work. And Types of Energy. Types of Energy. Kinetic Kinetic energy is energy in the form of motion A moving hockey puck has kinetic energy Potential Stored energy or energy not involving motion A car motionless at the top of a hill has potential energy. Work.

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The Meaning of Work

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  1. The Meaning of Work And Types of Energy

  2. Types of Energy • Kinetic • Kinetic energy is energy in the form of motion • A moving hockey puck has kinetic energy • Potential • Stored energy or energy not involving motion • A car motionless at the top of a hill has potential energy

  3. Work • Defined as the transfer of energy through motion. • In order for work to take place, a force must be exerted through a distance. • To calculate work you multiply the force by the distance (Work=force x distance) • The unit of measure for work is the Joule (J)

  4. Work cont. • If you push against a car and it doesn’t move, how much work was done? • A newton-meter or N•M is the same as a joule (J)

  5. Problems • A students full backpack weighs 30N. She lifts it from the floor to her desk 1.5m high. How much work was done to lift the pack? • A carpenter lifts a 45-kg beam 1.2m. How much work is done on the beam?

  6. Potential vs. Kinetic Energy of a Pendulum • Note the drawing on the board

  7. Law of Conservation of Energy • Energy can change form, but it cannot be created or destroyed under ordinary conditions. • This law applies to closed systems, in which energy cannot enter or leave the system. • Mechanical energy of a swing is converted to thermal energy due to friction and air resistance

  8. Assignment • Section wrap-up (p. 131) 1-3 • Skill Builder

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