energy lab

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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]
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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 views: 2 posted: 4/8/2012 language: English pages: 12