Transcript matter and energy 31pp

Matter and Energy
Section 3.1: Energy exists in different forms
Energy causes _____!
Kinetic Energy

The energy of __________.
Kinetic Energy

Which item has more energy? How do
you know?
Kinetic Energy

increases
Kinetic energy _____________
as speed
increases.
SPEED
KINETIC ENERGY
Kinetic Energy

Formula:
 KE = ½ mv2



KE = Kinetic Energy
m = mass
v = velocity

Example:


Mass of truck = 12 kg
Velocity = 4 m/s
Solve:
(1/2) (12 kg) (4 m/s)2
(1/2) (12 kg) (16m2/s2)
(6 kg) (16 m2/s2)
KE = 96 J
Kinetic Energy

Formula:
 KE = ½ mv2



Data:
mass = 8 kg
velocity = 2 m/s
(1/2) (8 kg) (2 m/s)2
(1/2) (8 kg) (4 m2/s2)
(4 kg) (4 m2/s2)
KE = 16 J
Potential Energy

Stored
____________
energy that an object
has.
Potential Energy

Potential Energy exists due to its
____________.
position
HIGHEST POINT OF
POTENTIAL ENERGY
Potential Energy
Potential Energy

Which item has potential energy due to
its position?
Potential Energy
The potential
energy
decreases
when the spring
is released.
More potential
energy due to
the spring’s
compression.
Potential Energy

Potential Energy exists due to chemical
composition.
Potential Energy

GPE = mgh





GPE = gravitational
potential energy
m = mass
g = gravity
h = height
Gravity on earth is
always 9.81 m/s2

Example:


Mass = 5 kg
Height = 25 m
(5 kg)(9.81 m/s2)(25 m)
GPE = 1226.25 J
Potential Energy

GPE = mgh

Example:



Mass = 18 kg
Height = 5 m
Gravity = 9.81 m/s2
(18 kg) (9.81 m/s2) (5 m)
GPE = 882.9 J
Types of Energy
 Mechanical
 The
Energy:
objects
energy that moves________.
Types of Energy

Sound Energy
sound
Energy created from_________.
vibration
 Sound results from the ___________
of
particles in a solid, liquid, or gas.
empty space
 Sound cannot travel through _____________.

Types of Energy

Chemical Energy

chemical
Energy that is stored from the ___________
composition of matter.

Example: burning wood is chemical energy
Types of Energy

Thermal Energy
The total amount of energy from the
movement of particles in ___________.
matter
 The more they move the more energy they
create. Therefore, which state of matter
would create more thermal energy?

Types of Energy

Electromagnetic Energy
empty space
Transferred through _____________.
 Examples:


visible light…
Types of Energy

Nuclear Energy


Comes from the
__________
nucleus of an
atom.
When the atom’s
nucleus breaks
apart energy is
released.
Types of Energy

Electrical Energy

energy made available by the flow of
electric charges through a conductor.
What type of energy am I?