The+Deformation+Of+Stress+Balls+When+Put+Under+Mass

Lydia E   Cary Academy ** ABSTRACT  ** This experiment’s purpose was to see which stress ball would decrease the most when mass was added to it. It was hypothesized that the Eight Ball stress ball would decrease the most with the maximum of 1,000 grams added to it, and the Smiley face stress ball would decrease the least with the maximum of 1000 g. Five Stress balls were put under 10 g mass up to 1000 g mass and the average of the decrease in diameter was found in cm. The five stress balls were the Eight ball, Smiley face, IsoFlex, White homemade, and green homemade. The data was recorded, and a second experiment was performed. Five male subjects and five female subjects were then asked to rate the stress balls on the softness. The stress balls were rated from one to ten (10 being hard and 1 being soft) and the data was recorded. It was then found that the Eight ball stress ball decreased 1.7 cm from its original height to the height after 1000 g. The Smiley face stress ball decreased the least as hypothesized by decreasing 0.3 cm from its original height to the height after 1000 g. The other stress balls had a lower number of decreases. For the second experiment the stress ball that was found the hardest based on tester ratings was the Smiley face stress ball. The stress ball found to be the softest was the White Homemade stress ball.
 * THE DEFORMATION OF STRESS BALLS WHEN PUT UNDER MASS **