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Roosevelt PS2

Work and Power

Work = __________________ x ____________________ Force x distance
Energy is the ability to do _________________. Work
Power = _______________ divided by ____________. Work, time
Work: the transfer of energy the occurs when a force makes an object ____________. move
Power is ______________ done in a specific amount of ____________. work, time
Work is measured in ________________. joules
Power is measured in _______________. Watts
For work to occur, an object must ____________, move
The motion of an object must be in the ___________ direction of the applied force for work to occur. same
If a person walks up 4 m of stairs then later runs up the same 4 m of stairs, they are doing the same amount of work each time. T or F True
A person pushes with a force of 8,000 N on a car that is stuck in the mud. The car does not move. Did the person do any work? No
How much work is done by a crane that lowers 1000 N of material a distance of 100 m? 100,000 J
You are walking to physical science class carrying your 50 N backpack. You climb 10 m of stairs then walk 15 m down the hall. How much work is performed on your backpack? 50 N x 10 m = 500 J
A donkey performs 20,000 J of work for 20 seconds. What is the donkey's power? 1,000 Watts
A tow truck pulls a car out of a snow drift in 5 seconds using 5,000 W of power. How much work is performed by the truck? 5,000 W x 5 seconds = 25,000 J
An elevator uses 15,000 J of work and 3,000 Watts of power to lift 5 passengers to the floor they desire. How much time did this take? 15,000 J divided by 3,000 W = 5 seconds
Created by: JKSW2014