Lab #3 – Calculating Work
Work = Force x distance
Work = (Force)(Distance)
W = Fd
Problem
How can a ramp help us pull a
heavy object up to a greater height?
Hypothesis
Materials
Ruler, chair, ramp (inclined
plane), weights, spring scale, various metallic objects
Procedure
Results
A. Work done
without ramp
Object

Force
(Newtons)

Distance
(cm)

Work
(Joules)

20 g Weight

__N

__cm

___J

50
g Weight


100 g Weight


200
g Weight


500
g Weight


Metal
Object

B. Work done
with ramp
Object

Force
(Newtons)

Distance
(cm)

Work
(Joules)

20 g Weight

N

cm

J

50
g Weight


100 g Weight


200
g Weight


500
g Weight


Metal
Object

Make another Hypothesis: Use your hands to feel the trash
bags, plastic maps, sandpaper, cloth, etc.
Which of these will cause more work
to be done on the weights?
C. Work done
with ________ and ramp
Object

Force
(Newtons)

Distance
(cm)

Work
(Joules)

20
g Weight


50
g Weight


100
g Weight


200
g Weight


500
g Weight


Metal
Object

D. Work done
with _________ and ramp
Object

Force
(Newtons)

Distance
(cm)

Work
(Joules)

20
g Weight


50
g Weight


100
g Weight


200
g Weight


500
g Weight


Metal
Object

ANALYSIS
1)
Make two graphs
to compare your Results: Graph 1 will compare the data in A and B, Graph 2 will
compare the data in B, C, and D.
2)
How did the
weight (force pulling down) affect
the amount of work done on the
object?
3)
Compare/Contrast
the trial with the least amount of work
to that with the most amount of work.
4)
Part 1 (A,B): What
is your Independent Variable?
5)
Part 1 (A,B): What
is your Dependent Variable?
6)
Part 1 (A,B): What
are your Constants?
7)
Part 2 (B,C,D): What
is your Independent Variable?
8)
Part 2 (B,C,D): What
is your Dependent Variable?
9)
Part 2 (B,C,D): What
are you Constants?
10)
Make an
inference: Which will increase the friction of the object you are pulling, the
plastic map/plastic bag or the sand paper?
11)
How did the sand paper affect the amount of work done on the object?
12)
Compare/Contrast
the work done between using the ramp
and not using the ramp.
Conclusion
What
was your problem?

Restate
your hypothesis. Was it right? wrong? why or why not?
Briefly
describe your procedure.

What
did you learn in this lab?

What
did you like about this lab?

What
were some challenges you had to deal with?

What
could you do next with this problem? What other tests could you
perform?

Write
down any other additional thoughts, observations, inferences, etc.
