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WorkMohammad Ali KhanDept. of Computer Science & Engineering
Faculty of EngineeringUniversity of Development Alternative (UODA)
What is Work• A force is said to do work if, when acting on
a body, there is a displacement of the point of application in the direction of the force.
Is work being done or not?
Mowing the lawn Weight-lifting Moving furniture
up a flight of stairs
Pushing against a locked door
Swinging a golf club
YES YES YES
NO
YES
Calculating WorkWork = Force x Distance
Work = 500N x 0m Work = 500N x 6m
= 0J = 3000J (3kJ)
no movement
500N
10s
300kg 500N
6m 5s
100kg
• Work does NOT involve time, only force and distance.
• No work is done when you stand in place holding an object.
• Labeling work: w = F x d• Newton X meter (N m)
–Which also = (kg x m2) s2
Do you do more work when you finish a job quickly?
Thank You
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