The Spinning Penny By: Randee N. Cassandra O.
Material’s Needed • 9 inch White or Clear Balloon • A penny, dime, nickel, quarter, or even a hex nut
Explanation • Penny continues to stay in motion for quite a while (Newton’s 1st Law) • It continues in a circular motion because of centripetal force and also because of the shape of the balloon • Eventually slows down because of minimal friction
Newton’s First Law of Motion • Law of Inertia • An object in motion stays in motion unless acted upon by an unbalanced force
Centripetal Force • Centripetal Force • “Center-seeking” force that is always directed toward the center of the circle • Responsible for keeping the penny moving in a circular motion inside the balloon
References • Spinning Penny Experiment: Steve Spangler Science http://www.stevespanglerscience.com/experiment/00000054 • Newton’s First Law: The Physics Classroom http://www.physicsclassroom.com/class/newtlaws/u2l1a.cfm • Centripetal Force: http://hyperphysics.phy-astr.gsu.edu/hbase/cf.html