Download - Do Now Monday, November 18, 2013
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Do NowMonday, November 18,
2013Periods 1&2 get ready for
your Unit #5 Exam. Afterwards, you will
complete your guided notes using the ppt online.
3.5 minutes
Do Now Check
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Do NowMonday, November 18,
2013What is Newton’s 3rd Law of
Motion? Provide a real-world example of Newton’s
3rd Law.
3.5 minutes
Do Now Check
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By the end of the day today, IWBAT…•Compare and contrast kinetic and potential energy•Calculate kinetic and potential energy
Why it matters in LIFE: Energy is what allows us to move!
Why it matters in THIS CLASS: This is a HUGE topic that is central to your understanding of everything we will be doing this semester.
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What it might look like on a test…
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Agenda
Do Now 7 min
Energy C-Notes 15 min
Kinetic or Potential? 8 min
Graphic Organizer Summary
5 min
Practice Questions 10 min
Exit Ticket 5 min
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Unit Cover SheetsTrackers
Unit 6: Work, Power, and Energy
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Monday, 11/18/13TEKS:
P 6.B - Investigate examples of kinetic and
potential energy and their
transformations
By the end of today, IWBAT…
Compare and contrast kinetic and potential
energyCalculate kinetic and
potential energyEssential Question:What is the difference
between kinetic and potential
energy?
Topic:Energy
Put this into your C-Notes!
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What is energy?
ENERGY is the ability to make things move or change
Measured in Joules (J)
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Forms of energy
Energy can exist in many different forms and changes from one form to another
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Kinetic and Potential Energy
For this unit, we are going to be focusing on the energy of movement
Two main types: Kinetic and Potential
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Kinetic Energy
KINETIC ENERGY is the energy of motion
Depends on mass and velocity
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Kinetic Energy
Which has a higher maximum kinetic energy, my first car or the camaro? Why?The camaro has more KE because it has a higher velocity.
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Kinetic Energy
Which would hurt more, getting hit by a 15 foot wave or a 2 foot wave? Why?
The bigger wave would hurt more because even though they travel at the same speed, the bigger wave has more mass.
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Kinetic Energy
Formula:
KE = ½mv2
mass (in kg) velocity (in
m/s)
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Kinetic Energy
The bird has a mass of 2 kg. It is flying at a speed of 5 m/s. Find its kinetic energy.KE = ?m = 2 kgv = 5 m/s
KE = ½mv2
KE = ½(2 kg)(5 m/s)2
= 25 J
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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
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Gravitational Potential Energy Potential Energy due to an object’s
position Formula:
PE = mghmass (in kg)
acceleration of gravity (9.8 m/s2)
height (in meters)
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Gravitational Potential Energy
•The person has more potential energy at the top of the stairs than at the bottom.
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Gravitational Potential Energy
Where does the egg have more potential energy? Why?
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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 = ?m = 2 kgg = 9.8 m/s2
h = 10 m
PE = mgh
PE = (2 kg)(9.8 m/s2)(10 m) = 196 J
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Elastic Potential Energy
Potential energy due compression or expansion of an elastic object
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Chemical Potential Energy
Potential energy stored within the chemical bonds of an object
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Every pair will receive a whiteboard and a marker.I will put a picture up on the board.You will have 30 sec to decide whether the picture represents kinetic or potential energy.Do not put your board up until I say. Be prepared to defend your answer!
Kinetic or Potential?
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Kinetic or Potential?
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Kinetic or Potential?
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Kinetic or Potential?
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Kinetic or Potential?
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Kinetic or Potential?
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Kinetic or Potential?
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Kinetic or Potential?
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Graphic Organizer Summary
Potential
Gravitational
Elastic
Chemical
Kinetic
KE = ½ mv2
Joules (J)
PE= mgh
mass velocitymass position
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Practice Problems
10 min to complete the practice problems
Work together Show all of your work!! Raise your hand if you have a question
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Exit Ticket
Complete the questions silently and independently
Hand it to me on your way out when the bell rings
Remember – I want to see your BEST work!