Lab IXi: WATER PRESSURE
Problem: What is the relationship
between how far water squirts out of a hole in a container and
the depth of the hole beneath the water?
Materials: see through milk container and gallon water
container with hole, ruler, beakers, large tray.
Hypothesis: Discuss with your what type of relationship
you expect to observe in this experiment. Give an explanation
for you hypothesis.
Procedure:
1) Put the milk
container over onto the metal tray as shown in the figure above.
2) Fill the
milk container to the top with water.
Take the cork out of the container and let the water empty
out.
3) Discuss with
your group how the water comes out as the water level decreases.
4) Let the water
continue to empty, recording your results with your group.
5) Cork up the
hole and fill the milk container again up to a height of 20 cm.
6) Open the cork
and measure how far the water squirts out when the height is 20
cm. You will have to
continue to add small amounts of water to keep the height of the
water at 25 cm.
7) Repeat the
above procedure to find out how far water now squirts when the
water level is at 20 cm., 15 cm., 10 cm., 1 cm.
8) Complete Table
I. in your Results Section.
9) Repeat step
1 7 using the large gallon sized container.
10) Complete
Table I. in your Results Section.
Results:
Table I shows
how far the water squirted depending on the height of water in
the container I.
Height (cm.)
Distance water squirts (cm.)
25
20
15
10
5
1
Table II shows
how far the water squirted depending on the height of water in
the container II.
Height (cm.)
Distance water squirts (cm.)
25
20
15
10
5
1
Graph the data
from Table I and Table II on the same set of axis.
Discuss the
shape of the curve with your group.
Discussion:
1) What type
of relationship did you observe?
Was your hypothesis correct?
Discuss your results.
2) Discuss the
reason for the relationship you observe.
3) What are the
independent and dependent variables?
4) How are the
variables changing with relationship to each other?
5) What happens
to the dependent variable when the independent variable increases?
decreases?
6) How does the
relationship shown in this experiment compare with other relationships
you have so far seen?
7) How does the
equation for this relationship compare with those of other equations
you have studied?
Applications:
