Energy and Motion

What is energy?
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

Magnets

What are magnets?
Magnets are objects that attract certain kinds of metal, such as iron.

http://www.youtube.com/watch?v=ak8Bh9Zka50


What are magnetic poles?
Magnetic poles are the opposite points or ends of a magnet, where magnetic forces are the greatest.

http://www.youtube.com/watch?v=f1zGie-_IHY



What does attract mean?
'Attract' means to pull together.

What does repel mean?
'Repel' means to push apart.

What is a magnetic field?
A magnetic field is the area around a magnet in which magnetic forces can act.



 http://www.youtube.com/watch?v=MZtTVsIOA9c

What are lines of force?
 Lines of force are the lines that show magnetic field.

http://www.youtube.com/watch?v=bqklpgqeB5Q



Earth is a natural magnet.

http://www.youtube.com/watch?v=DYLQmSuqPjY