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Andrianna Kaimis1/7/16IB Physics SLMr.GasserPersonal EngagementI wanted to make a lab related to tennis because it is a big part of my life. I amon the varsity tennis team at school, I participate in tournaments, and I hope to play tennis in college. It was hard to come up with an idea for a lab that included tennis balls. I decided that the maximum height at which the tennis ball is dropped could be my independent variable and the potential energy loss of when the ball bounces could be the dependent variable. This topic was interesting to me because in tennis the higher the ball is in the air the higher the bounce would be. I didn’t want to choose a topic with rebound height but I wanted to see if the ball loses and potential energy when it hits the ground based on height.My final investigation deals with the potential energy loss of a tennis ball and how it differs based on height. After I conducted some research I saw that the average mass of a tennis ball is .057kg, so I measured the mass of some tennis balls and found some with a mass of .057kg. Exploration:Research Question: How does the height of a tennis ball above the ground at the firstbounce affect its potential energy loss in the bounce?
Control Variables:The material of which the ball is made of affects its bouncing; Iwill use the same type of ball throughout the experiment. The ball is made of rubber,hollow on the inside, and covered with felt. The ground surface and the force offriction affect the bouncing of the ball. Therefore, the experiment will be done in thesame place, on a frictionless surface, in this case a small slab of granite. The initialvelocity of the ball should be always zero so that it won’t affect the bouncing; thetennis ball will be dropped from rest. The angle affects the velocity of the ball; theball will be set up at a right angle to the ground and will be dropped vertically. Theforce exerted on the ball affects the bouncing; there will be no force applied on theball other than gravity.