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PH Concepts in Action CH 15
Energy
20
Physics
9th Grade
02/11/2010

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Term
energy
Definition
the ability to do work
Term
kinetic energy
Definition
the energy of motion/movement, depends upon an object's mass and speed
Term
Potential energy
Definition
energy stored due to position or shape
Term
gravitational potential energy
Definition
a type of potential energy that depends upon an object's height
Term
elastic potential energy
Definition
potential energy of an object that is stretched or compressed
Term
mechanical energy
Definition
sum of an object's potential and kinetic energy; having to do with motion of everyday objects
Term
thermal energy
Definition
total potential energy and kinetic energy of all the microscopic particles of an object
Term
chemical energy
Definition
form of potential energy stored in bonds between atoms. Energy is released when bonds are broken.
Term
electrical energy
Definition
Energy associated with electrical charges (positive or negative)
Term
electromagnetic energy
Definition
Form of energy that travels through space as waves
Term
nuclear energy
Definition
Energy stored in the nuclei of atoms. Typically released through nuclear fission. (Nuclei is split.)
Term
energy conversion
Definition
the transfer of energy from one form to another
Term
How are work and energy related?
Definition
Work is a transfer of energy. Energy is the ability to do work.
Term
What factors does the kinetic energy of an object depend upon?
Definition
The objects speed and mass.
Term
How is potential energy determined?
Definition
By multiplying the object's mass x 9.8m/s(s) x the height of the object's position
Term
What are the major forms of energy?
Definition
mechanical, thermal, chemical, electrical, electromagnetic, and nuclear
Term
Can energy be created or destroyed?
Definition
No, only transfered from one form to another.
Term
What is the law of conservation of energy?
Definition
Energy cannot be created or destroyed, only converted from one form to another.
Term
What energy conversion occurs as an object falls towards Earth?
Definition
Gravitational potential energy of the object is converted to kinetic energy of motion
Term
How are energy and mass related?
Definition
Einstein's equation E=mc(2) demonstrates mass and energy are equivalent and can be converted back and forth between each other.
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