Physics Lab Report 6 Essay

Physics Lab Report#6

“Analyzing Stress and Strain Using Hooke’s Law ”

Name: Fei Huo

Date performed: November 5st, 2014

Period 5

Teacher: Mr. Glasel

Purpose:
The Purpose of this lab was to examine the relationship between force and the elongation on two different springs and a rubber band.

Introduction:
My classmates and I were using two different springs and a rubber band to see the relationship between the force and the elongation from the mass of some weights. We had to measure the length of how far is the spring stretched. Then calculate the elongation by centimeters.

Procedure:
1) First, we choose the small spring to start with and then attach it to the clamp to the ring stand with the meter stick.
2) Second, we put 0.400 kg as a pre-load because the reason is we want the spring to stretch with every increase in mass as we put on the string.
3) Third, adjust the meter stick on the ring stand so that the edge of the “pre-load” and make a good estimate of it.
4) Forth, add 0.200 kg record it into the chart, then put 0.400 kg record the elongation into the chart, then put 0.500 kg and record the elongation into the chart, then put 0.600 kg and record the elongation into the chart, then put 0.800 kg and record the elongation into the chart, and then put 1 kg and record the elongation into the chart.
5) Fifth, repeat the forth procedure, taking off the precious mass and add 0.500 kg, 0.600 kg, 0.800 kg. and 1 kg to the spring and record it into table 1, how much it elongates with each.
6) Sixth, repeat this whole procedure for the long spring and the rubber band using a preload of 0.200 kg for the long spring and 0.050 kg for the rubber band.

Data:
Mass
Force
Elongation (cm)
(Kg)
(N)
Short spring
Long Spring
Rubber band
“pre-load”
0
0
0
0
0.200
1.962
2
6.2
4
0.400
3.924
3
16
10
0.500
4.905
5.2
21
12.7
0.600
5.886
6.5
23.2
15.6
0.800
7.848
8.4
34.2
19.2
1.00
9.81
10.9
42.2
22.7

Questions:
1. Make a graph of Force (Y-axis) vs. Elongation (X-axis) for the short spring, long spring, and rubber band all on the same axis. Be sure to distinguish between data sets.

2. From the plot of you graphs, describe the relationship between Force (stress) and Elongation (strain) for an object that obeys Hooke’s Law. ~An object obeying the Hook’s law in the graph depends on how the spring is more of a straight line.

3. Which of the three objects tested, obey Hooke’s Law? How can you tell? ~The long spring obey Hooke’s law because judging by the graph, the Elongation and the force are directly proportional than the short spring and the rubber band.

4. Which information can be obtained from the slope of a Force vs. Elongation graph? ~The slope of the force vs. Elongation graph shows the short spring is steeper than the others. The rubber bands slope is constantly changing and the long spring’s slope is directly proportional to one

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