Potential Energy Essay

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By the end of the day today, IWBAT…
•Define and solve for Kinetic energy

Launch: What is the definition of physics? Physics is the study of matter and matter’s relationship with force and energy. Monday 5 January

Agenda



Launch/Kick Of

10 min

5%

Reading

20 mins

50%

Notes/Questions

20 mins

45%

Homework: Read and Take notes:
8.4-8.5

Logistics



If you want to go over your test come in at lunch.
Semester supplies









Get a spiral notebook/composition book for notes
A pack of index cards
Check for completion (with this week’s notes) by Friday

Tardys and not doing HW = lunch detention/parent phone call home
Failing a quiz = phone call home
3 failed quizzes = parent conference





This Matters
The Struggle Matters
I Matter





Be
Be
Be
Be

Respectful
Responsible
Honest
Accountable

Work, Power, and Energy

What is energy?
ENERGY is the ability to make things move or change





Measured in Joules (J)

Kinetic Energy





KINETIC ENERGY is the energy of motion
It is a SCALAR quantity – it does not have direction Depends on mass and speed

Kinetic Energy


Formula:

KE = ½mv

2

mass (in velocity (in kg) 1 Joule = kg m/s)
• m2/s2

Kinetic Energy


The bird has a mass of 2 kg. It is flying at a speed of 5 m/s. Find its
KE
= ? energy. kinetic m = 2 kg v = 5 m/s
KE = ½mv2
KE = ½(2 kg)(5 m/s)2
= 25 J

By the end of the day today, IWBAT…
•Define and solve for Potential energy

Launch: What is the kinetic energy of a
1 kg baseball traveling at a speed of
10 m/s?

Tuesday 6 January

Agenda
Launch/Kick Of

10 min

5%

Notes/Questions

30 min

45%

Practice

10 min

55%

Homework: Read and take notes: 8.6

Review






What is the unit for energy?
What are the two kinds of energy of motion? What does kinetic mean?
What does KE depend on?

KE ~ Square of the speed


The kinetic energy of an object is directly proportional to the square of its speed.






That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four.
How would a threefold increase in speed afect the kinetic energy?
What would a graph of KE as a function of speed look like?

Potential Energy






An object with POTENTIAL ENERGY has the ability (or potential) to move or change
Sometimes called “energy of position” or
“stored energy”
There are 3 types of potential energy:




Gravitational Potential Energy
Elastic Potential Energy
Chemical Potential Energy

Gravitational Potential Energy




Potential Energy due to an object’s position Formula:

PE = mgh

height (in mass (in meters) kg) acceleration of gravity (9.8
2

Gravitational Potential Energy
If your egg drop device has a mass of 2 kg, how much potential energy does it hold at a height of 10 meters?
PE =
PE = ? mgh PE =
(2 kg)(9.8 m/s2)(10 m) = m = 2 kg
196 J g = 9.8 m/s2 h = 10 m


Gravitational Potential Energy
•The person has more potential energy at the top of the stairs than at the bottom.

Gravitational Potential Energy
Where does the egg have more potential energy? Why?

Elastic Potential Energy


Potential energy due compression or expansion of an elastic object

Chemical Potential Energy


Potential energy stored within the chemical bonds of an object

By the end of the day today, IWBAT…
•Introduce Conservation of Energy (COE) and use COE to solve for KE and PE
What is the total energy of a 5 kg toy car traveling 4 m/s on top of a table that is 1 m of the ground?
(use 10 m/s2 for g)

Wednesday 7 January

Agenda



Launch/Kick Of

10 min

5%

Review

10 min

15%

Quiz

20 min

70%

Notes

10 min

10%

Homework: Print out Lab

Review








What is the unit for energy?
What are the two kinds of energy of motion? What does kinetic mean?
What does KE depend on?
What does potential mean?
What does gravitational PE depend on?

Graphic Organizer Summary
Joules (J)
PE= mgh
Potenti
al
Gravitation
al

Elastic

Kinetic
Chemica
l mass KE = ½ mv2

mass

velocity position By the end of the
Show More

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