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Will A ball bounce higher if it is dropped at A greater distance? By: Mia Long Ms.Morningstar 7th Hour 1-17-12

Monday, February 6, 2012

Background Information
Independent variable = drop height Dependent variable = bounce height Controlled variables = ball, surface and measuring tool Mechanical energy, both potential and kinetic, as well as the force of gravity come into play when a ball is dropped and bounces off a surface. The potential energy is converted to kinetic energy as the ball is pulled to the ground by gravity.As the ball hits the floor, that energy is used to deform the ball and the surface it hits.The height of the bounce is a measure of the amount of energy remaining with the ball after impact.The efficiency of a ball and its bouncing surface at conserving energy can be measured by comparing the bounce height to the height from which the ball was dropped. Kinetic energy - The word "kinetic" is derived from the Greek word meaning to move, and the word "energy" is the ability to move. Thus, "kinetic energy" is the energy of motion --it's ability to do work. The faster the ball moves the more kinetic energy is produced. The greater the mass and speed of the ball the more kinetic energy there will be. As the ball bounces the potential energy is converted into kinetic energy.

Potential energy - is the same as stored energy. The "stored" energy is held within the gravitational field. When you lift a ball you exert energy which later will become kinetic energy when the object is dropped. A lift motor from a roller coaster exerts potential energy when lifting the train to the top of the hill. The higher the train is lifted by the motor the more potential energy is produced; thus, forming a greater amount if kinetic energy when the train is dropped. At the top of the hills the train has a huge amount of potential energy, but it has very little kinetic energy.

Monday, February 6, 2012

Material List

YardStick or Meter stick Tape A Table Any...

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