1. How they are defined by science
Work and Power
How they are defined by science

2. Work Work is the product of force and distance
The formula is work = force x distance
Work is done on an object when a force acts on the object in the direction it moves
For example, someone lifting a barbell is doing work on that barbell

3. Work If there is no movement than no work is being done
For work to be done on the object some of the force needs to act in the direction of the object
If a weightlifter is just holding the barbell over his/her head than no work is being done since the barbell is not moving

4. Work = force x distance The unit for work is Joule (J)
For example if the weightlifter lifted the barbell. Calculate the work done if the barbell weighs 1600 Newtons and he lifts the barbell 2 m.
It would be: W = 1600N x 2m = 3200 J

5. Power Power is the rate of doing work
Doing work at a faster rate requires more power
To increase work you can increase the amount of work done in a given time or do a given amount of work in less time

6. Power Power = work/time = distance x force time
The unit for power is the watt which is equal to one joule per second
So it takes 40 joules per second to light a 40 watt lightbulb

7. Horsepower A common unit for power
One horsepower is equal to 746 watts
Horsepower was first defined by Scottish scientist James Watt
He used horses to compare the power of his steam engines
He did not want to exaggerate the power so he used the strength of a very strong horse