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