Download Unit 9: Energy, Work, and Power

Energy
Lesson Goal: Become familiar with various forms of
energy.
At the Bell: Pick up the worksheets at the front of
class and complete the warm up.
Warm Up
1) What is energy?
2) How many forms of energy can you name?
3) How do Humans get their energy?
What is energy?

Energy
◦ It’s the ability to do work (move something)
◦ Law of Conservation of Energy:
 Energy is never created or destroyed, but is
changed from one form into another.
◦ Total amount of energy in a system is
CONSTANT—it stays the same.
What are the different forms of energy?

Energy can be present in different forms of
energy or a combination of forms.

Mechanical
Chemical
Electrical
Thermal
Light
Sound
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Mechanical Energy

Mechanical energy: energy due to the
position of something or the movement of
something.

Types of Mechanical Energy:

Potential energy (PE): stored energy

Kinetic energy (KE): energy of motion
Potential Energy


Potential energy is stored energy
3 types of PE
◦ Elastic Potential Energy
 Stored energy when a material is stretched or
compressed
 Ex: Rubber Band or spring
◦ Chemical Potential Energy
 Energy stored in the bonds between atoms
 Ex: Energy stored in food
 Ex: Energy stored in batteries
Gravitational Potential Energy
Depends on the height and mass of an
object.
 Stored energy due to position of an object
 Higher up = more potential energy
 More mass = more potential energy

PRACTICE TIME!

For the following pictures, name what type of
potential energy is present:
Kinetic Energy
Kinetic energy is the energy of motion.
 If an object is moving, then it has kinetic
energy.
 The faster an object is moving, the more
kinetic energy it has.
 In most situations, as kinetic energy
increases, potential energy decreases.

PRACTICE TIME!!!

In the following situation, tell me when
the object will have the:
◦
◦
◦
◦
Least KE
Most KE
Least PE
Most PE
As Kinetic Increases, Potential Decreases

What kind of energy does the sled have at the top of the hill
before it starts moving?

As the sled goes down the hill, what does that energy turn into?
Roller Coaster Energy:
You Will Be Making This Next Week

PE can be converted to KE and back to PE

Watch the animation and explain the
transformation of energy.
In The Real World…

If a roller coaster goes down the first hill would it
continue to go on forever if the track kept going?
Roller Coaster Project…
Electrical Energy


Energy made available by the movement of
electrons through a conductor (wire).
We can make electric energy by converting
another energy form into electricity:
◦
◦
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Solar Panels
Windmills
Generators
Chemical
Where Does Michigan Get It’s Energy From?
Chemical Energy
Chemical energy is a type of energy that is
stored in chemical bonds and can be converted
into other forms…
 Examples

◦ Batteries store chemical energy
◦ Your body stores energy from food as chemical energy
◦ Photosynthesis
 Plants use energy from the sun to make sugar. Energy is stored in the
bonds of the sugar
Other Forms of Energy

Thermal
◦ Heat
◦ Friction can cause KE to be converted to thermal
energy

Light
◦ Energy associated with electromagnetic waves
 Sun gives us light energy
 Solar Panels

Sound
◦ Noise is actually a form of energy
What is energy?

Sci Show:
https://www.youtube.com/watch?v=CW0
_S5YpYVo
Tomorrow: Energy Transformations
& Design Day for Roller Coasters

Humans have created inventions to turn one
form of energy into another to better our
lives. Examples of these are:
◦
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Light Bulbs
Motors
Air Conditioners
Heaters
Roller Coasters
The list goes on and on…
Physical Science P
Energy Transformations
 Lesson
Goal: Identify energy
transformations occurring in familiar
everyday situations.
 At the Bell: Pick up the notes at the
front of class.
Energy Transformations
Warm Up:
 List the 6 main types of energy that we talked about
yesterday:
◦ Mechanical
◦ Thermal (Heat)
◦ Light (Radiant)
◦ Electrical
◦ Chemical
◦ Sound

The whole point of producing energy is to turn it
from one form into another…these are ENERGY
TRANSFORMATIONS.

The ways we produce electricity are varied but all rely on
energy transformations.
Examples of Energy Transformations
1) Toaster
2) Fan
3) Lighter
4) Windmill Producing Electricity
5) A Dam Producing Electricity
Examples of Energy Transformations
6) When you drop a book and it is falling, what
kind of energy does the book have?
7) What is the energy transformation when
gasoline powers a car driving down the road?
Examples of Energy Transformations
8) What is the energy transformation when you
eat some pasta before you run a marathon?
9) What is the energy transformation of
dynamite exploding?
Examples of Energy Transformations
10) A Solar Panel
11) Burning Coal for Energy
Examples of Energy Transformations
12) Going Up and Down on a Skateboard
Ramp?
13) What is the energy transfer of lighting a
lighter?