1. What Is Work?
Chapter 12 Section 1

2. The Meaning of Work
Work is the force exerted on an object that causes it to move.
Work is done on an object when the object moves in the same direction in which the force is exerted.

3. No Work Without Motion
To do work on an object, the object must move some distance as a result of your force.
If the object does not move, no work is done, no matter how much force is exerted.

4. Force in the Same Direction
To do work on an object, the force you exert must be in the same direction as the object’s motion.

5. Calculating Work
The amount of work you do depends on both the amount of force you exert and the distance the object moves.
The amount of work done on an object can be determined by multiplying force times distance.

6. Calculating Work Work = Force x Distance
SI unit for work is newton x meter (N·m)
This unit is also called a joule (J)
One joule is the amount of work you do when you exert 1 newton to move an object a distance of 1 meter.

7. Power Power is the rate at which work is done.
Power equals the amount of work done on an object in a unit of time.

8. Power
A device that has more power than another device does more work in the same time. or
A device that has more power than another device can do the same amount of work in less time.

9. Calculating Power
Power is calculated by dividing the amount of work done by the amount of time it takes to do the work.
Power = Work = Force x Distance
Time Time

10. Power Units SI unit of power is J/s This is also known as the watt (W)
One joule of work done in one second is one watt of power.

11. Other Units 1000 watts(W) = 1 kilowatt (kW)
1 horsepower (hp or HP) = 746 watts (W)