Transcript Energy What is energy?

Energy
What is energy?
What is energy?
What is energy?
 Energy
is the ability to do
work or cause change.
What is energy?
 Energy
is the ability to do
work or cause change.
 Work = Force * distance
What is energy?
 Energy
is the ability to do
work or cause change.
 Work = Force * distance
 Force = Mass * Acceleration
What is energy?
 Energy
is the ability to do
work or cause change.
 The total amount of energy
in the universe doesn’t
change and has always been
here.
What is energy?
 Energy
is the ability to do
work or cause change.
 The total amount of energy
in the universe doesn’t
change and has always been
here.
–1st Law of Thermodynamics
What forms does
energy come in?
What forms does
energy come in?

Kinetic energy:
What forms does
energy come in?

Kinetic energy: The energy an object
has due to its motion.
What forms does
energy come in?

Kinetic energy: The energy an object
has due to its motion.
– The kinetic energy of an object is due to
both its mass and velocity.
What forms does
energy come in?

Kinetic energy: The energy an object
has due to its motion.
– The kinetic energy of an object is due to
both its mass and velocity.
2
– Kinetic energy = ½ X mass X velocity
What forms does
energy come in?
– Potential energy:
What forms does
energy come in?
– Potential energy: Stored energy that
results from the position or shape of an
object.
What forms does
energy come in?
– Potential energy: Stored energy that
results from the position or shape of an
object.
 Gravitational
potential energy:
What forms does
energy come in?
– Potential energy: Stored energy that
results from the position or shape of an
object.
 Gravitational
potential energy: Potential
energy related to an object’s height.
What forms does
energy come in?
– Potential energy: Stored energy that
results from the position or shape of an
object.
 Gravitational
potential energy: Potential
energy related to an object’s height.
– Gravitational potential energy = weight X height
Question?

Who has more gravitational potential
energy?
– Skier A has a mass of 50 kg and a height
of 5m.
– Skier B has a mass of 60 kg and a height
of 4m.
Question?

Who has more gravitational potential
energy?
– Skier A has a mass of 50 kg and a height
of 5m. GPE = 50X5 = 250 J
– Skier B has a mass of 60 kg and a height
of 4m. GPE = 60X4 = 240 J
What forms does
energy come in?
– Potential energy: Stored energy that
results from the position or shape of an
object.
 Gravitational
potential energy: Potential
energy related to an object’s height.
– Gravitational potential energy = weight X height
 Elastic
potential energy: The potential energy
of objects that can be stretched or
compressed.
What are some
types of energy?
What are some
types of energy?
What are some
types of energy?
Electromagnetic
 Thermal
 Sound
 Mechanical
 Electrical
 Nuclear
 Chemical

What are some
types of energy?

Electromagnetic: Energy that is
caused by the acceleration of charged
particles.
What are some
types of energy?
Electromagnetic: Energy that is
caused by the acceleration of charged
particles.
 Thermal: The total of all potential and
kinetic energy of a particle.

What are some
types of energy?
What are some
types of energy?
Electromagnetic: Energy that is
caused by the acceleration of charged
particles.
 Thermal: The total of the potential and
kinetic energy of the particles in an
object.
 Sound: The energy produced by an
object’s vibration.

What are some
types of energy?

Mechanical: The form of energy that is
associated with the position and
motion of an object.
What are some
types of energy?
What are some
types of energy?
Mechanical: The form of energy that is
associated with the position and
motion of an object.
 Electrical: The energy of electrical
charges and can be potential or
kinetic.

What are some
types of energy?
What are some
types of energy?

Nuclear: A type of potential energy that
is stored in the nucleus of an atom.
What are some
types of energy?

Nuclear: A type of potential energy that
is stored in the nucleus of an atom.
– Nuclear fission: The splitting of nucleus.
What are some
types of energy?

Nuclear: A type of potential energy that
is stored in the nucleus of an atom.
– Nuclear fission: The splitting of nucleus.
– Nuclear fusion: The fusing of two
separate nuclei into one nucleus.
What are some
types of energy?

Nuclear: A type of potential energy that
is stored in the nucleus of an atom.
– Nuclear fission: The splitting of nucleus.
– Nuclear fusion: The fusing of two
separate nuclei into one nucleus.

Chemical: Potential energy that is
stored in the chemical bonds that hold
chemical compounds together.
Can energy change
from one type to
another?
Can energy change
from one type to
another?

ABSOLUTELY
Nuclear
Electromagnetic
Chemical
Mechanical (movement)
thermal (body temp.)
Electrical (brain)