BY: Jorge Quesada Research Elasticity Friction Air Resistance Hypothesis If I drop a ball from a high point then, it well bounce higher than if dropped from a lower height. Independent and Dependent Variable Independent Variable The height The type of ball Dependent Variable Speed at witch the ball falls Controlled Variable (3) The Type of ball Friction Rate of fall Materials and Procedures Materials Foam balls Timer (phone) Ladder Pen and Paper Procedure Position a ladder at the site of the experiment. Drop a ball three times (one at a time) from a height of 5ft, record rate of fall. Drop a ball three times (one at a time) from a height of 8ft, record rate of fall. compare results Data 0.635 0.63 0.625 0.62 0.615 Average Rate of Fall 0.61 * 0.605 0 0.6 0.595 0.59 0.585 5ft Fall 8ft Fall Conclusion It turn out that my hypothesis was indeed correct, that the higher the ball fell the more time it took for it to land. Experiment 2 Does wind affect the time it takes a ball to land on the ground? Hypothesis If my research is correct, I think that wind will affect the landing time of a ball. Independent and dependent variable Independent variable Speed of wind (high, low, medium) The ball Dependent variable Speed the ball falls Controlled variables Air friction Rate of fall Type of ball Materials and procedures Materials Ball fan Procedures Place a fan in the mid point of the ball’s falling distance. Drop ball from 6 ft on low(fan speeds), then medium , and high. Repeat 3 times. Record time of fall and average. Data average 6.2 6 5.8 5.6 5.4 average 5.2 5 4.8 4.6 4.4 Low medium high conclusion It turns out that the speed of the fan did affect the time it took the ball to hit the ground. Experiment 3 Does height affect the elasticity of a ball? Hypothesis I think it does have a effect on the ball elasticity in the height the ball is dropped Independent and dependent variable Independent variable Foam ball The height the ball is dropped from Dependent variable The height the ball jumps back up in inches Controlled variable Type of ball Elasticity The height the ball is dropped Materials and procedures Materials Foam ball Measuring tape Procedures One person stands in place Ball is dropped from 3, 4 and 5 feet high Record bounce distance of the ball in inches Data average in inches 35 30 25 20 average in inches 15 10 5 0 3ft drop 4ft drop 5ft drop Conclusion The elasticity of the ball was affect to the height the ball was dropped.