1. WORK

2. 1. Work
Work – transfer of energy that occurs when a force makes an object move
Two conditions for work:
(A) object must MOVE AND
(B) object must move in the SAME DIRECTION as the applied force

3. 2. Work and Energy
Remember…energy is the ability to cause change; in other words, the ability to do work
Energy is always transferred from the object that is doing the work to the object on which the work is done

4. 3. Calculating Work Work = Force X Distance W= F X D
Force = N; Distance=M; Work = J
Greater force or distance…greater amount of work involved
(Distance only while force is applied to it.)

5. 4. Power
Power – amount of work done in a certain amount of time; ie, the rate at which work is done
Power = Work/Time
Power is measured in watts (W)

6. Watts Named after James Watt, inventor of the steam engine
Watt is very small…about the power needed to raise a glass of water from the table
Thus, power is often measured in kilowatts
1 kilowatt = 1,000 watts

7. 5. Power and Energy
Doing work is one way of transferring energy from one object to another (not all energy requires work)
Power is produced or used any time energy is transferred from one object to another
Thus, Power = Energy/Time