Energy is the ability to do work.
http://www.youtube.com/watch?v=o_5oYuDY2qM
What is kinetic energy?
Kinetic energy is energy of motion.
http://www.youtube.com/watch?v=ASZv3tIK56k
What is potential energy?
Potential energy is stored energy.
http://www.youtube.com/watch?v=t2vnyfNK870
Forms of energy
Chemical energy
Heat energy
Mechanical energy
Nuclear energy
Radiant energy
Electrical energy
What is motion?
Motion is a change in position.
What is elapsed time?
Elapsed time is the amount of time that passes from one event to another.
What is speed?
Speed is the rate at which the position of an object changes.
Speed formula
What is gravity?
Gravity is a force of attraction between any two objects that have mass.
Law of Universal Gravitation
Gravitational force depends on the mass of the two objects involved and on the distance between them.
What is acceleration?
Acceleration is a change in speed or direction.
http://www.youtube.com/watch?v=JDgVbgH85zY
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