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WORK and ENERGY

WORK and ENERGY. Work. work => the transfer of energy to a body by the application of a force that causes the body to move in the direction of the force. W – joules (J), F- Newtons (N), d - m. Determine if work is being done in these situations: a. lifting a spoonful of soup to your mouth

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WORK and ENERGY

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  1. WORK and ENERGY

  2. Work • work => the transfer of energy to a body by the application of a force that causes the body to move in the direction of the force W – joules (J), F- Newtons (N), d - m

  3. Determine if work is being done in these situations: • a. lifting a spoonful of soup to your mouth • b. holding a stack of books motionless over your head • c. letting a pencil fall to the ground causes an object to move.

  4. 1. A crane uses an average force of 5200 N to lift a girder 25 m. How much work does the crane do on the girder?

  5. 2. An apple weighing 1 N falls through a distance of 1 m. How much work is done on the apple by the force of gravity?

  6. 3. The brakes on a bicycle apply 125 N of frictional force to the wheels as the bicycle travels 14.0 m. How much work have the brakes done on the bicycle?

  7. Power • power => a quantity that measures the rate at which work is done or energy is transformed W – joules (J), P- watts (w), t - s

  8. 1. While rowing across the lake during a race, John does 3960 J of work on the oars in 60.0 s. What is his power output in watts?

  9. 2. Every second, a certain coal-fired power plant produces enough electricity to do 9 × 108 J (900 MJ) of work. What is the power output of this power plant in units of watts (or in units of megawatts)?

  10. 3. Using a jack, a mechanic does 5350 J of work to lift a car 0.500 m in 50.0 s. What is the mechanic’s power output?

  11. Energy • The ability to do work • Unit is the Joule (J) • There are many types of energy

  12. Kinetic, potential, heat, electrical, nuclear, chemical, light, sound

  13. KE and GPE

  14. An object has a mass of 50.1 g and a KE of 250 J. What is its velocity?

  15. An object has 1300 J of gravitational potential energy when 34.5 m above the ground. What is its mass?

  16. What is the kinetic energy of an object moving 32.5 m/s if it has a mass of 34 kg?

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