1. Power
In which situation would you tire more quickly?

2. Notice that in the formula for work, it says nothing about time
Work = force x distance

3. The rate at which work is done
Power
The rate at which work is done
Power = work done
time
Unit: Joule
second
: watt

4. A little bit of history
To find out how the power of his engine compared to that of a horse, James Watt measured how fast an average horse could do work. He found the answer and expressed the amount of work performed per second as a horsepower.
1 horsepower = 746 Watts
In the US we rate engines in terms of horsepower and electricity in watts (kilowatts, megawatts)

5. Horsepower

6. What can a more powerful engine do?
One of 2 things
Power = work done
time
2x work or work
time ½ time

7. A Lab for you to do