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Work
• Work is done on an object when the object moves in the same direction in which the force is exerted.
• If no motion occurs then there will be no work.
• Did you do work with your book bag on your back walking to class?
Calculating Work
• Work depends on two things:
1. Force
2. Distance
• Which would require more work:
1. Lifting a 50N potted plant .5 m off the ground to a table or a 100N potted plant the same distance.
Calculating Work
• We can find the work it takes to move objects with the following equation.
W= Force (F) x Distance (d)
• The following unit is used for work:
• Joule (J)
Now, find how much work it would take to move each of the plotted plants.
Calculating Work
How much work would it take to move a 250 N car a distance of 5m?
How much work would it take to lift a 63 N book a distance of 3m?
Practice Problems
1. Calculate the work done on a wagon if you push it 35m with a force of 53N.
2. Calculate how much force you would need to pull a wagon if you applied 65 J of work and pulled a distance of 25m.
3. Would you be doing work to a box if you carried it to a moving truck? Explain.