Lab 4.1 Static Friction (1) (1)
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Lab 4.1 Static Friction
When two surfaces are in contact and try to slip past each
other, friction causes a resistance to that motion. The size
of the frictional force is proportional to the normal force.
The constant of proportionality is called the coefficient of
friction, and uses the Greek letter μ to represent it.
࠵?
"
= ࠵?࠵?
In this lab you will determine the value of μ by measuring
the size of the frictional force for a number of different
masses. The graph of the frictional force vs the normal will
have a slope equal to μ.
Materials
Drag sled
Spring scale
Weights (biology books)
Procedure
1.
Obtain a drag sled, spring scale and 5 biology textbooks.
2.
Connect the spring scale to the drag sled and rotate the scale so you can read the newton side
of the scale.
3.
Place the sled on the lab bench and pull gently on the other end of the spring scale until the sled
just begins to move. Record the spring scale reading in the Force column of the data table at the
point of first movement.
4.
Add a book to the sled and repeat step 3.
5.
Continue adding additional books one at a time and repeat step 3 until you reach 4 books.
6.
Record values from the board at the front of the room for the mass of the sled and the mass of a
book.
Mass of sled = _______kg
Mass of a book = ______kg
# of Books
fs Force (N)
Total mass (kg)
Normal (N)
0
1
2
3
4
Analysis
1.
Determine the total mass for each line by adding the mass for each book plus the mass of the
sled.
2.
Calculate the size of the normal by multiplying the total mass by 9.8 m/s
2
.
10 N
35 N
36.328
63.376
47
1 N
117.482
90.434
55 N
0.928
0.947
3.467
6.347
9.047
11.747
Eddie Elias, Caleb Callan,
Fischer Whitehead
6
.947
2.7
3.
Graph the data points with the Normal on the x-axis and the Fs Force on the y-axis.
4.
Draw a straight line through the data points as best you can.
5.
Find two points that lie exactly on the best fit line and use them to calculate the slope. This will
be the value for μ. Show that work here:
6.
Using your value for μ, predict what the force would need to be to slide 5 books. Do that work
here including your prediction:
Prediction for fs force to drag 5 books:
_________
7.
Take one final set of data for the force required to drag 5 books.
fs Force to drag 5 books: ________
8.
Calculate the % error between these values.
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