Lab Report: Why Do Discus Throwers Spin Around First?

First Name: Sirius
Age: 9
Experiment Title: Why Do Discus Throwers Spin Around First?
What was the purpose of your experiment? Provide a brief description of what you were hoping to learn, discover, or study.: I was hoping to learn why discus throwers spin around first.
What was your hypothesis?: They spin around to get extra power. It probably also helps them throw straight.
What materials did you use in your experiment? List them all.: Penny, Party Balloon.
What procedure was followed? Provide a brief description of the steps you followed during your experiment.: I blew up a balloon with a penny inside it. I held it, then turned it upside down and then started spinning it in a circular motion so that the coin spins inside the balloon.
What were the results of your experiment?: The coin spun inside.
What is your conclusion after conducting the experiment? Was your hypothesis correct or incorrect?: My hypothesis was correct. The coin relates to the discus throwers circle motion.
Spend a few minutes learning about the scientific principles involved in your experiment. Write 3-4 sentences about what you learned and how it relates to your experiment.: The wall of the balloon supplied the centripetal force to keep the coin spinning. The discus thrower’s arm does the same job, pulling the discus towards them. IF the balloon suddenly popped, the coin would fly out in a straight line, like the discus.