The product of force and the amount of displacement along the line of action of that force. Units: ft . lbs (horsepower) Newton•meter (Joule) e

3. Work
 The product of force and the amount of displacement
along the line of action of that force.
Units: ft . lbs (horsepower)
Newton•meter (Joule) e
ntdisplacemeForceWork 

4. Work = F x d
To calculate work done on an object, we need:
The Force
The average magnitude of the force
The direction of the force
The Displacement
The magnitude of the change of position
The direction of the change of position

5. SAMPLE PROBLEMS
 1. How much work is done by a student who lifts a 5-kg
box to a vertical height of 1.5m?
 2. A porter pulls a 10-kg luggage along a level road for
5m by exerting a force of 20 N at angle of 30◦ with the
horizontal shoulder through a vertical distance of 1.5
m and carries it for another 5 m. How much work does
he do in (a) pulling, (b) lifting and (c) carrying the
luggage on his shoulder? 15pts.

6. QUIZ
Directions: Write the following problems and solve it in
your science quiz notebook.
 1. How much work do you do by pushing a sack of rice
with a force of 100N across a distance of five meters?
 2. After finishing his lab report, Carlo pulls his 75-kg
body out of the study room chair and climbs up the
5.0-m high flight of stairs to his bedroom. How much
work does he do in going to his bedroom?
 3. How much force must Mariz exert on the window
shade if she exerts 2.5-J of work to lower the window
shade to a distance of 0.5m?