| A | B |
|---|
| WORK | A force acts on an object, and the object moves in the direction that is parallel to the force (same direction) |
| WORK EQUATION | W = Fd (W=mad) |
| ZERO WORK | Force (F) and distance (d) are perpendicular to each other (ex. hold book up and walk with it) |
| NO WORK IS DONE | If the object does not move, then... |
| JOULE (J) | The unit for Work is the... |
| twice the work (directly proportional) | What happens if twice the work is exerted over the same distance? |
| twice the work (directly proportional) | What happens if the object moves twice the distance? |
| power | Amount of work done divided by the time interval during which the work is done |
| watt (w) | unit for power |
| power formula | P = W/t |
| power | Rate at which work is done |
| work | transfer of FORCE from one object to another over some DISTANCE |
| work | Consider the scenario below. When is the weight-lifter doing WORK? Lifting dumbbell from ground-level to waist-level |
| NOT Work (Weight-lifter only controls RATE of GRAVITY) | Consider the scenario below. When is the weight-lifter doing WORK? Lower dumbbell to waist-level |
| W = F x D = 500N x 4m = 2000.00J | How much Work is needed to lift an object that weighs 500N to a height of 4m? |
| W = F x D = 1000N x 8m = 8000.00J | How much Work is needed to lift 1000N to a height of 8m? |
| NO because the wall did not move any Distance. | A man pushes on a wall with ALL HIS MIGHT. The wall doesn't move. Is there work done on the wall? |
| unit for power | Joules/Second = Watts (W) |
| W = F x d = 70.00 J | If you exert a force of 35 N to lift a box a distance of 2 m, how much work is done? |
| P = W / t = 8.00 w | A stage manager at a play raises the curtain by doing 200 J of work on the curtain in 25s. What is the power output of the stage manager? |
