...Work

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The following three questions refer to the material you were to read in preparation to the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle.

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1.

A weight lifter picks up a barbell and

1. lifts it chest high

2. Holds it for 5 minutes

3. puts it down.

Rank the amounts of work W the weight lifter performs during this three operations (i.e the work done by the force of his hands on the barbell). Label the quantities as W1, W2, and W3. Justify your ranking order.



2.

Estimate the amount of work performed on a 1200 kg car as it accelerates at 1.2 m/s2 over a 150 meter distance.




3.

A tiny rocket engine accelerates a toy car over a distance of twelve meters. The thrust of the engine vs. the distance is shown on the graph. Which of these is the best estimate of the work performed by the little engine?
(Note: The axes are each calibrated from 0 - 12.)

114 J

60 J

46 J

zero J





Below is a space for your thoughts, including general comments about today's assignment. What was hard or confusing (or cool)? What would you like to spend extra time on in class? Do you see how this subject fits in with the others we have discussed?




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