Lab 7 Hookes law - N/A PDF

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ILLINOIS CENTRAL COLLEGE

NAME

___________________

Foundations of Physics

Phys 110

Lab Partners:

Grade

Hook Hooke e’s Law Purpose: This lab will help you understand Hooke’s Law

Required Equipment: Elastic band, your car You will be using animation from the below site https://phet.colorado.edu/sims/html/hookes-law/latest/hookes-law_en.html

Required Lab Report There are two parts 1. Complete this worksheet. Write a Summary of what you understood from the lab ( 500 words) 2. Login to mastering physics via blackboard and answer the questions

1

Background: Hooke's law states that extension of a spring is proportional to applied force. If a spring obeys Hooke's law, then a graph of applied force against extension will be a straight line, whose gradient (slope) is k: The equation of the straight line is: where: = stretching force applied to the spring = spring constant = extension of the spring

Part A: Validating Hooke’s Law Open the following simulator and click the lab option: https://phet.colorado.edu/sims/html/masses-and-springs/latest/masses-and-springs_en.html

a) Place the 100g mass onto the spring. The spring will begin to oscillate up and down. Stop this by clicking on the mass several times or increasing the ‘Damping’ value to ‘Lots’. b) Click the ‘Displacement’ and ‘Movable Line’ options on the right. Adjust the movable red line to the tip of the green arrow.

c) Use the ruler tool (the units are in cm) on the bottom right to measure the extension of the spring with the 100g mass. Convert this mass to a weight (use ) and add this data to table 1. Remember to convert g to kg.

Mass added (g)

Weight (N)

Extension (cm)

100g

0.100kg *9.8 = 0.98

17

120 g

0.12*9.8=1.176

21

140 g 160 g 180 g 200 g Table 1

d) Using the slider at the top, change the mass and record 5 more results of weight and extension. Add your results to table 1.

e) Plot a graph (in logger pro) for Force (y-axis) against extension (x-axis). Draw a line of best fit through your points.

Paste your logger pro graph here, make sure you have the legends and units

f) Using your graph, determine the spring constant of your spring (in finding the slope.

) by

g) What evidence from your graph shows that the spring obeys Hooke’s Law?

PART B: Activity In this activity you are going to compare the elastic constant of your car and an elastic band Take an elastic band. Stretch it at least three times. What can you say about the elastic constant of the spring ? Do you expect the elastic constant value to be a high value or a low value compared to your car. No need to use numbers , give your explanation.

Describe an experiment to find the elastic constant of your elastic band .

Now observe the lower portion of the car. Do you see a spring connected to the tires of the car. What can you say about the elastic constant of the spring of the car ? Do you expect the elastic constant value to be a high value or a low value in comparison to an elastic band. No need to use numbers , give your explanation.

Summary of the experiment (500 words)...