Home Store Project Ideas Project Guide Ask An Expert Blog Careers Teachers Parents Students

Rubber Band Elasticity and Temperature

Difficulty
Time Required Average (6-10 days)
Prerequisites None
Material Availability This project requires some specialty items. They can all be purchased online, or you may be able to borrow them from school. See the Materials and Equipment section below for details.
Cost Low ($20 - $50)
Safety Adult supervision is required for heating and pouring boiling water.

Abstract

Many materials expand when heated and contract when cooled. What do you think will happen to the elasticity (stretchiness) of a rubber band when it is heated or cooled to various temperatures?

Objective

The goal of this project is to investigate how the restoring force of a rubber band varies with temperature.

Credits

Andrew Olson, Ph.D., Science Buddies

Justin Spahn, Science Buddies

Sandra Slutz, Ph.D., Science Buddies

Sources

The idea for this project is by Vince Calder, from his answer on the Newton Ask A Scientist bulletin board:

Cite This Page

MLA Style

Science Buddies Staff. "Rubber Band Elasticity and Temperature" Science Buddies. Science Buddies, 2 Sep. 2014. Web. 26 Nov. 2014 <http://www.sciencebuddies.org/science-fair-projects/project_ideas/ApMech_p026.shtml>

APA Style

Science Buddies Staff. (2014, September 2). Rubber Band Elasticity and Temperature. Retrieved November 26, 2014 from http://www.sciencebuddies.org/science-fair-projects/project_ideas/ApMech_p026.shtml

Share your story with Science Buddies!

I did this project I Did This Project! Please log in and let us know how things went.


Last edit date: 2014-09-02

Introduction

All matter is made up of atoms, like carbon, or hydrogen, or oxygen. Atoms are linked together to form larger compounds called molecules. Some molecules are made by stringing together repeated subunits. Such molecules are called polymers. In some polymers, including many synthetic polymers in textiles and plastics, the subunits are identical. In other polymers, such as proteins manufactured inside cells, the subunits have a common 'backbone' structure, to which different chemical groups are attached.

Rubber is an example of a natural polymer. The chains of molecules in rubber have a natural elasticity: they can stretch when pulled. When the pulling force is removed, the elastic polymers in rubber spring back to their original length. A polymer with elastic properties like this is sometimes called an elastomer. The molecular chains of an elastomer basically act like springs.

Solid materials generally expand when heated and contract when cooled. How will temperature affect the elasticity of rubber bands? You can find out for yourself with this experiment.

Terms and Concepts

To do this project, you should do research that enables you to understand the following terms and concepts:

  • Atom
  • Molecule
  • Polymer
  • Elastomer
  • Hooke's law

Questions

  • How does the elasticity of rubber change with temperature?

Bibliography

For help creating graphs, try this website:

News Feed on This Topic

 
, ,
Reading level:
Note: A computerized matching algorithm suggests the above articles. It's not as smart as you are, and it may occasionally give humorous, ridiculous, or even annoying results! Learn more about the News Feed

Materials and Equipment

To do this experiment you will need the following materials and equipment:

  • Rubber bands (six or more, all of the same size and width)
  • Scissors
  • Thermometer
  • 250 ml graduated cylinder (1); must be clear and heat resistant. This item can be purchased from online vendors, for example item 18V753 from Ward's Natural Science. You may be able to borrow a similar item from your school.
  • 100 g hooked steel weight (1). This item can be purchased from online vendors, for example item 15V3728 from Ward's Natural Science. You may be able to borrow a similar item from your school.
  • Water
  • Ice
  • Pot or kettle
  • Stovetop
  • Wooden spoon, or other long-handled tool for stirring
  • Ruler or tape measure, metric
  • Play dough or putty
  • Bamboo skewer or popsicle stick

Share your story with Science Buddies!

I did this project I Did This Project! Please log in and let us know how things went.

Experimental Procedure

  1. Do your background research so that you are knowledgeable about the terms, concepts, and questions, above.
  2. Heat a pot of water to boiling on the stovetop. With the help of an adult, carefully pour the boiling water into the graduated cylinder.
  3. Using the scissors, cut one rubber band so that it is a straight ribbon rather than a circle.
  4. Tie one end of the rubber band to the middle of the skewer, and the other end to the hook on the steel weight.
  5. Gently, being careful not to burn yourself on the hot water or steam, lower the weight and rubber band into the graduated cylinder. Rest the skewer across the opening of the graduated cylinder to prevent the whole thing from falling inside. Use putty or play dough to secure the skewer to the edges of the graduated cylinder. Figure 1 below shows a diagram of the experimental setup.
    Diagram of the experimental setup showing how to measure rubber band stretch while the rubber band is immersed in water.

    Figure 1. The diagram above shows how to immerse the rubber band in water, by dangling it from a skewer. The other end of the rubber band is securely tied to a weight and a ruler is used to measure the rubber band stretch length between the skewer and the weight.

  6. Measure the water temperature with a thermometer. With the ruler, measure the rubber band stretch length between the skewer and the weight. Record both of these measurements in a data table in your lab notebook.
    1. Tip: If you find it difficult to use the ruler to measure the rubber band stretch length, then use the ruler to measure how many millimeters apart the tick marks are on the graduated cylinder. Now count tick marks between the bamboo skewer and the weight and convert that back into millimeters.
  7. Continue to measure the water temperature and stretch length every three to five minutes until the water temperature stabilizes around room temperature.
  8. Once the temperature has stabilized, pour out approximately 25mL of water from the graduated cylinder. Add 25mL of ice water to replace it. Mix the water in the graduated cylinder thoroughly with the handle of a wooden spoon or other long implement. Measure the water temperature and rubber band stretch length. Record the measurements in your lab notebook.
  9. Repeat step 8 until the final water temperature is approximately the same as your ice water.
  10. Repeat steps 2-9 twice more. Use a new rubber band each time. Make sure the starting length of your rubber bands (once they are tied to the bamboo and weight) is approximately the same each time.
    1. Repeating the experiment a total of three times will help you determine if your findings are consistent and reliable.
  11. Make a line graph of the rubber band stretch length (y-axis) vs. the water temperature (x-axis).
    1. In the end you should have one graph with three lines, each representing a different trial with a different rubber band.
    2. You can make your graph by hand, or use computer software, like Create A Graph.
  12. What happened to the rubber band stretch length as the temperature decreased? Is this what you expected to see based on your background reading? Did all three of your experimental trials behave similarly? What do you think would happen to the rubber band stretch if you started with ice water and kept increasing the water temperature? Repeat the experiment, this time figuring out a way to start with ice water and end with near-boiling water.

Share your story with Science Buddies!

I did this project I Did This Project! Please log in and let us know how things went.


Variations

  • Do rubber bands behave like springs? Use the Experimental Procedure described in the following Science Buddies project with rubber bands in place of springs in order to find out: Applying Hooke's Law: Make Your Own Spring Scale.
  • Do you think that the force required to break a rubber band will change with temperature? Use a spring scale to measure the maximum force that a rubber band can withstand before breaking. Perform multiple trials with rubber bands at different initial temperatures.

Share your story with Science Buddies!

I did this project I Did This Project! Please log in and let us know how things went.

Ask an Expert

The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help. Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot.

Ask an Expert

Related Links

If you like this project, you might enjoy exploring these related careers:

NASA material scientist

Materials Scientist and Engineer

What makes it possible to create high-technology objects like computers and sports gear? It's the materials inside those products. Materials scientists and engineers develop materials, like metals, ceramics, polymers, and composites, that other engineers need for their designs. Materials scientists and engineers think atomically (meaning they understand things at the nanoscale level), but they design microscopically (at the level of a microscope), and their materials are used macroscopically (at the level the eye can see). From heat shields in space, prosthetic limbs, semiconductors, and sunscreens to snowboards, race cars, hard drives, and baking dishes, materials scientists and engineers make the materials that make life better. Read more
Mechanical engineer building prototype

Mechanical Engineer

Mechanical engineers are part of your everyday life, designing the spoon you used to eat your breakfast, your breakfast's packaging, the flip-top cap on your toothpaste tube, the zipper on your jacket, the car, bike, or bus you took to school, the chair you sat in, the door handle you grasped and the hinges it opened on, and the ballpoint pen you used to take your test. Virtually every object that you see around you has passed through the hands of a mechanical engineer. Consequently, their skills are in demand to design millions of different products in almost every type of industry. Read more
female mechanical engineering technician

Mechanical Engineering Technician

You use mechanical devices every day—to zip and snap your clothing, open doors, refrigerate and cook your food, get clean water, heat your home, play music, surf the Internet, travel around, and even to brush your teeth. Virtually every object that you see around has been mechanically engineered or designed at some point, requiring the skills of mechanical engineering technicians to create drawings of the product, or to build and test models of the product to find the best design. Read more

News Feed on This Topic

 
, ,
Reading level:
Note: A computerized matching algorithm suggests the above articles. It's not as smart as you are, and it may occasionally give humorous, ridiculous, or even annoying results! Learn more about the News Feed

Looking for more science fun?

Try one of our science activities for quick, anytime science explorations. The perfect thing to liven up a rainy day, school vacation, or moment of boredom.

Find an Activity