3.4 Work
Calculate Work
In the following situations, calculate the work being done.
Example #1:
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John is pushing on a car with a force of 400N. After pushing it 5m, what is the work that John did on the car? Is John's work converted into potential or kinetic energy? Think about an answer before checking solution. |
Example #2:
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David is in training and doing sprints with a parachute. David pulls with an average force of 150N over the 20m sprints. How much work does David do on the parachute? Is David's work being converted into potential or kinetic energy? Think about an answer before checking solution. |
Example #3:
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Sonia is doing a plank for 45 seconds. She weighs 400 N and is holding herself up about 0.2 of a meter off the floor. What is the work Sonia is doing? Think about an answer before checking solution. |
Example #4:
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Val pulls back a bearing in her new sling shot. She pulls it back about 30 cm with an average force of 100N. What is the work that Val does? Is Val's work converted into potential or kinetic energy? Think about an answer before checking solution. |
