Work Worksheet
Work is defined as the force applied times the displacement of the object to which the
force was applied. Therefore, if there is no displacement, there was no work done. To
make things more complicated work is only done when the components of a force are
parallel to the displacement of the object. That means we might have to use a little
trigonometry. Remember SOHCAHTOA. Whew…
With that in mind, solve the following problems.
For numbers 1-4 simply say whether or not you are doing work.
1.
2.
3.
4.
_____You push a chair across a room.
_____You push your hardest against an immobile wall.
_____You pull your little brother from home to school.
_____You ride your bike down a hill without pedaling.
Solve. Answer in N∙m.
5. Mr. Stephens moves the 100 N snake tank straight up 2 meters.
6. A football player tackles a running back and pushes him 3 meters using a force of
200 N.
7. A nurse moves a patient from a 1 m bed up to a 2 m bed using a force of 75 N.
8. A truck pulls a trailer with a force of 980 kN over 3 km.
9. You pull a wagon at an angle of 30 degrees to the ground with a force of 25 N for
10 m.
10. You push on a couch at an angle of 45 degrees to the ground with a force of 7575
cN for .005 km.