Work Work Work is the transfer of energy
- Slides: 12
Work
Work • Work is the transfer of energy through motion • Is work being done on the trays?
Work • Work is only done: – When a force produces motion – A force is exerted through a distance (same direction)
Work
Formula • Work = Force x Distance • W = Fd F= W/d d= W/F
Units • The unit of measurement is the Joule (J) • 1 J = 1 Newton-meter
A Cheesy Video • http: //www. youtube. com/watch? v=b. Nu. Mhnh N 2 -A
Practice Problem • A student’s backpack weighs 30 N. She lifts it from the floor to a shelf 1. 5 m high. How much work is done on the backpack?
Practice Problems • A carpenter lifts a 45 kg beam 1. 2 meters. How much work is done on the beam?
Practice Problems • A dancer lifts a 400 N ballerina overhead a distance of 1. 4 meters and holds her for several seconds. – How much work is done during the lift? – How much work is done while holding her?
Practice Problems • Bricks have a mass of 2. 0 kg. How much work would you do if you lifted 50 of these bricks, one at a time, from the ground to the back of a pick-up truck 85 cm above the ground?
Practice Problems • When you throw a frisbee you might apply about 15 N of force and your hand might cover a distance of 75 cm. How much work would you do if the frisbee’s mass was 141 g?
Energy energy transfer and general energy analysis
Energy energy transfer and general energy analysis
Work is the transfer of energy
Work is transfer of
A repeating disturbance that transfers energy
Section 2 describing energy worksheet answers
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