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					   Energy

1/10/12 & 1/11/12
                Energy
• Energy: The property of an object or a
  system that enables it to do work
  Unit: Joules (J)
• (Gravitational) Potential energy: Energy
  due to relative position of two objects
• Kinetic energy: Energy due to the
  motion of an object
           Energy (cont.)
• Mechanical energy: The sum of the
  kinetic energy and potential energy of a
  system.
• In other words, it is energy due to
  position and movement.
• Non-mechanical: is internal energy that
  takes place on the molecular level (light
  energy, chemical energy, thermal
  energy, vibrational energy, or sound)
 Law of Conservation of Energy
• Law of Conservation of Energy: Energy
  can not be created or destroyed, but is
  can be transformed from one form to
  another, the total amount never
  changes.
        Energy Equations
• Kinetic Energy
• Potential Energy
• Conservation of Energy
    Today’s Lab
[need to create a title]
  [your name and period]
Purpose:
• To measure the potential and kinetic
  energies of six different objects in
  order to see how energy is transferred
  and conserved.
Hypothesis:
List the order of which object will bounce
    the highest to lowest.
• Tennis ball        • Styrofoam ball
• Golf ball          • Plastic ball
• Racquet ball       • Ping-pong ball
“I think that the ____ will bounce the
    highest, then the ____ followed by …”
State your reason why you think it will be
    in this order.
Materials:
• meter stick
• tennis ball (57 g)
• golf ball (46 g)
• racquet ball (41 g)
• Styrofoam ball (12.6 g)
• plastic ball (3.4 g)
• ping-pong ball (2.3 g)
Return all materials to cart when finished.
  Procedures and Data Table
• You will need to list the procedures
  needed to conduct this lab
• You will need to create a data table for
  this lab.
  (remember to include a title and units)
                     Calculations:
     (Calculations need to be done in T-Charts for one ball)
1.   Find the gravitational potential energy of each of the
     balls from the drop height.
2.   Find the velocity of each of the balls from the drop height
     as it hits the ground. (Where PEdrop = KEdrop)
3.   Find the gravitational potential energy of each of the
     balls from the bounce height.
4.   Find the velocity of each of the balls from the bounce
     height as it hits the ground. (Where PEbounce = KEbounce)
5.   Find out how much energy is transferred in “thermal
     energy” for each of the objects. Equation for “thermal
     energy”: [ TE = PEdrop – PEbounce ]
6.   Calculate the percentage of how much energy is
     transferred into “thermal energy” for each of the balls
     using the following equation:
                                    (TE)
                                           × 100 = % of energy transfer
                                    (PEdrop)
    Conclusion: (In paragraph form.)
•   Identify all of the independent and dependent
    variables in this lab.
•   When does each object have the most potential
    energy?
•   When does each object have the most kinetic
    energy?
•   List the order of which ball transfers the least
    amount of “thermal energy” to the most, after it
    bounces.
•   Compare this to your hypothesis.
•   Describe in your own words how energy is
    transferred.

				
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posted:4/8/2012
language:English
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