ENERGY AND WORK
Say whaaaat?
WHAT IS ENERGY?
•
energy - the ability to do work or cause change
WHAT IS WORK?
•
work - force exerted on an object that causes it
to move (transfer of energy)
TWO MAIN TYPES OF
ENERGY
•
Kinetic Energy - energy of motion
•
Potential Energy - stored energy
KINETIC ENERGY
•
depends on mass and velocity
•
Formula:
•
•
KE = (mv2) / 2
Units:
•
Joules (J)
POTENTIAL ENERGY
•
stored energy
•
Formula (PE gravitational):
•
PE = mgh
•
Units = Joules (J)
WHAT IS A JOULE?
•
Named after James Prescott Joule
•
studied work (physics) in the 1800’s
•
One Joule is the amount of work you do when
you exert a force of one newton to move an
object one meter.
VOCABULARY
•
energy - the ability to do work or cause change
•
work - force exerted on an object that causes it to
move
•
kinetic energy - energy that an object has due to its
motion
•
potential energy - energy that is stored
VOCABULARY
•
elastic energy - potential energy stored in
stretched or compressed objects
•
gravitational energy - potential energy that
depends on the height of an object
•
mechanical energy - kinetic or potential energy
associated with the motion or position of an object
VOCABULARY
•
thermal energy - the total energy of the particles
in an object, heat energy
•
chemical energy - the potential energy stored in
chemical bonds
•
electrical energy - the energy of moving electric
charges
VOCABULARY
•
electromagnetic energy - the energy of light and
other forms of radiation
•
nuclear energy - the potential energy stored in the
nucleus of an atom
•
joule - a unit of work equal to one newton-meter
IF YOUR STUCK ON KE DO
THIS
1. SQUARE VELOCITY.
2. MULTIPLY THAT ANSWER BY MASS.
3. DIVIDE THAT ANSWER BY 2.