WORK

WORK: You are doing work when you use a force to cause motion. To measure the amount of work you do, multiply the force times the distance the object moved.


Work= F x D
(work= force x distance the object moved)

Force (or weight) is measured in newtons
Distance is measured in meters.

Unit measure of work = newton x meter or newton meter
A newton meter (N-m) is called a joule (J)

Machines make work easier.The work that comes out of a machine can never be greater than the work put into a machine.

ACTIVITY: How much work is done when an object is lifted?

MATERIALS: meter stick
newton spring scale
objects to lift
string
pencil and paper

1. Make a chart like the one below to record your data. __________________________________________________________________
OBJECT FORCE USED DISTANCE LIFTED WORK DONE
(NEWTONS) (METERS) (JOULES)
__________________________________________________________________
1._______________________________________________________________
2._______________________________________________________________


2. Attach an object to the spring scale.
3. Slowly lift or pull the object. Record how much force you used to pull or lift
the object (Newtons).
4. Measure the distance you moved the object. Record the distance in meters.
5. Find out how much work you did by using the formula, work=force x distance
the object moved. Record your answer on the chart.
6. Repeat steps 2-5 with other objects.

To WORK IS SIMPLE WITH SIMPLE MACHINES