1. Work & Power
Lecture

2. Work Work = Force x distance (W=Fd)
Anytime you apply a force to an object and move it you are doing work.
Measured in Joules (J)
J = N * m

3. Is this person doing work?
Since the barbell is not moving this person is not doing work.

4. Practice Problems:
Compare the amount of work done in these two situations… Situation 1: You lift two loads up one story of stairs Situation 2: You lift one load up one story of stairs. You do twice as much work in situation 1 because, you have twice the mass and therefore twice the force.

5. Two types of work: Work done against a force
Example: raising an object up against gravity
work done to change the speed of an object
Example: speeding up a car

6. Power Rate at which work is done Power= work done time interval
Unit: Watt (W)= J/s
The higher the power, the more rapidly the work is done