PASCO ME-6819A Discover Set (10 Pack) - Manual (Page 2)

Discover  Set (10 Pack) Equipment Set Up
2 ®
Equipment Set Up
Each disk has a slot designed to hold the tape in place while you mea-
sure the circumference. To keep the tape from slipping, follow these
steps.
1. Fold the tape at the dashed line.
2. Stick the adhesive stop on the dashed circular outline.
Experiment
What is the relationship between the circumference and
diameter of a circle? Is the ratio of circumference to diame-
ter different for different-sized circles?
In this experiment, you will measure the circumference and
diameter of four different circles and make a graph of cir-
cumference versus diameter.
Procedure
1. Slip the folded end of the measuring tape into the slot
on the side of one of the disks.
2. Wrap the tape once around the disk so that it overlaps
the zero-line marker.
3. Record the circumference.
4. Measure the diameter along the line marked on the face
of the disk. Record the diameter.
5. Repeat steps 1 through 4 for the other disks.
Analysis
1. Use your measurements from all four disks to make a graph. Plot circumference
on the vertical axis and diameter on the horizontal axis.
2. Place an appropriate fit on the graph.
Questions
1. Write an equation for your graph.
2. What is the physical meaning of the slope of your graph?
3. What is the physical meaning of the vertical intercept of your graph?
4. A truck tire measures 1.0 m in diameter. Based on your experimental data, what
is the circumference? (Show your work and explain your reasoning.)
1cm
2
3
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5
6
fold
1cm
2
3
4
5
6
1cm
2
3
4
5
6
wrap
1cm
2
3
4
5
6
7
8
9
1
1cm
2
3
4
5
6
7
8
9
1