![]() You can make a graph by hand or use a website likeĬreate a Graph to make a graph on the computer and print it.Be sure to average your results for each stretch length.Stop after you have done 10 trials for the five different stretch lengths.For example, after you have done 10 trials for the 10 cm stretch length, do 10 trials for the 15 cm stretch length, then the 20 cm stretch length, etc. Repeat steps 5 to 8, but use a different stretch length each time.Did all 10 trials have similar launch distances, or was there a lot of variation in how far the rubber bands flew? Average the data from these 10 trials to get better results. ![]() Write this measurement in your data table. Measure the distance from your line to the spot your helper just marked.Have your helper draw a circle where that rubber band landed.Remember the angle and height you hold the ruler, because you will need to keep it the same for each rubber band launch.Shoot a rubber band by hooking it on the front edge of the ruler, then pulling back to your first length (10 cm) on the ruler and then letting go.This is also where you will begin measuring the distances your rubber bands have gone. This is where you will line your feet up when you shoot your rubber bands. With your piece of chalk draw a line in front of your toes.Stand on one side of the space, and have your helper stand on the other side, not directly in your line of fire!.Your helper will draw circles around where the flying rubber bands land, so choose a helper with a keen eye and some running shoes! You will want a place with a lot of clearance that has a cement or hard-caped surface that you can draw on with chalk. Find a helper, gather your supplies, and go outside to do this experiment.In your lab notebook, write a data table like this one so that you can record how far your rubber bands fly when they are released from different stretch lengths. What is the difference between elastic potential energy and other forms of potential energy? What is the mathematical equation for calculating elastic potential energy?.Which gives the rubber band the most potential energy, stretching it to 30 cm or 10 cm?.If I stretch it back 30 centimeters (cm), how far will the rubber band go? If I stretch it back to only 10 cm, how far will the rubber band go?.How will the potential and kinetic energy affect the distance your rubber band travels? You will investigate the relationship between the potential energy and kinetic energy in this system by seeing how far the rubber band flies when it is stretched to different lengths. When the rubber band is released, the potential energy is quickly converted to kinetic energy. Because the rubber band shooter is technically an elastic system, the kind of potential energy that it has is specifically called elastic potential energy. By stretching the rubber band back to different lengths, you will give the system different amounts of potential energy. In this system you will stretch a rubber band over the end of a ruler and release it (without aiming it at anyone of course). (Image adapted from In this science fair project, you will investigate how kinetic and potential energy work in a very simple system: a rubber band shooter. The "snake-in-a-can" joke is an example of Potential Energy (PE) and Kinetic Energy (KE). Kinetic energy is energy that is in motion.įigure 1. Potential energy is energy that is stored. There are two types of energy being demostrated potential energy (PE) and kinetic energy (KE). But when the can is opened, the potential energy is quickly converted to kinetic energy as the snake jumps out of the can! Since the spring is usually decorated to look like a long snake, this prank usually causes the victim to jump back and shout! When the snake is secured inside the unopened can, it has potential energy. This is an old joke where you give someone a can of peanuts and tell them to open it, but inside is actually a long spring that jumps out of the can when they open it. Potential Energy (PE): energy that is storedĪ great example of the difference between kinetic and potential energy is from the classic "snake-in-a-can" prank, shown in Figure 1.The person is providing an energy input for the mechanical system to work.Ĭlearly mechanical systems need energy to do work, and the energy needed comes in two different kinds: They would not work at all if there was not a person using their own energy to pull up the rope. Consider a rope and pulley that bring a bucket up a well. But to do "work" in the classical sense, takes energy. No mechanical contraption would be any fun to use if it did not work.
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