## Mrs. Lyons - Energy Test - 11-11-10

##### Created by:

Horizonboy  on November 11, 2010

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# Mrs. Lyons - Energy Test - 11-11-10

 the capacity to do workDefine energy
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#### Definitions

the capacity to do work Define energy
stored energy define potential energy
energy in motion define kinetic energy
a change from one form of energy to another define energy conversion
calculation of how much energy a certain material gives back define coefficient of restitution
energy cannot be created or destroyed define Law of Conservation of Energy
energy accquired by objects when they are displaced by another object (combination of both potential and kinetic) describe Mechanical
stored in chemical bonds describe Chemical
movement of electrons describe Electrical
Heat energy from the fast movement of atoms or molecules describe Thermal
Essentially "pure" energy always in motion describe light
Vibration of motion of air molecules describe Sound
Stored in the nucleus of an atom converting mass to energy (E = Mc squared) describe Nuclear
positive electrode (cathode), negative electrode (anode), and electrolyte What are the 3 parts of a battery?
chemical energy What form of energy is actually stored in the battery?
chemical arrow electrical and thermal arrow sound, mechanical, and thermal Describe the energy conversion in a battery and a motor
The electrolyte making the + and - electrode react (fight) with a closed circuit What causes the current to move through the battery?
no more ions in electrolyte/reaction complete, broken/open circuit connection between anode and cathode, and electrode (anode) completely dissolved Why would a battery quit working? (3 reasons)
voltage (V) - the "pressure" that causes charge to flow along and amps (A) - measure the volume of electrons Name the two energy units for a battery and what they represent?
wet cells have electrolyte in a liquid and dry cells have electrolyte in the battery in paste form What is the difference between a wet cell and a dry cell battery?
current is forced through the battery in the opposite direction, causing the Reversible chemical reaction (electrical energy is converted into chemical energy) What has to happen for a battery to be recharged?
Kinetic energy is energy in motion and potential energy is stored energy How is kinetic energy different from potential energy?
Light bulb - Chemical arrow electrical and thermal arrow thermal and light. Motor - chemical arrow electrical and thermal arrow sound, mechanical, and thermal give 2 examples of energy conversion chains
because of the friction produced Why do you always have thermal energy in energy conversions?
change to stronger electrode, use a stronger electrolyte, bigger battery/more stuff, and stack cells What are 4 things that could change the amount of energy in a battery?
square root (rebound height/drop of height) What is the formula for COR?
because the rebound is always lower than its drop height and that some of the energy produced is converted into other things like sound and heat Why is the COR value always between 0 and 1?
the more elastic the surface it hits and the material the ball is made of the higher the rebound. the less elastic the surface it hits and the material the ball is made of the lower the rebound. How does the material in a ball and the surface it hits effect rebound?
because elements like thermal and sound energy takes some energy that is produced by the ball If the Law of Conservation is true why doesn't a ball rebound all the way back up?
first the battery must have a closed circuit. After this happens the chemical reaction in electrolyte supplies electrons. then the electrons move from the anode. From there it then goes through the light bulb. Finally it goes back to the cathode. How does a battery work to turn on a light?

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