Tuesday, Feb. 17th p. 174, 175

Tuesday, Feb. 17th

1742/17/15 Tues.L.T.: I can review PE and KE through a reading and apply my knowledge using a roller coaster as a model.DO NOW: What does it mean for something to have PE? How can you tell whether something has KE? DO you ever have KE? How do you get it and lose it?………………….Reflection:Did you read the article collaboratively and answer the questions?Did you make predictions and observations compare the two? How accurate were you? Where were there differences with your thoughts and your observations? Why do you think this was?

175Title: PE/KETape in article

p. 1381A, 1B.

Diagram of roller coaster

1 2 5 3 4 6 7 8 9

Question Prediction Observation

Fastest speed?

Greatest KE?

Both KE/PE?

Low vs high hill?

SNB Checks due today!

5th period DO NOW

• Gain E by eating and drinking and lose it by standing still??? (but you still have PE because you’re standing up)• Objects can have 100% or 0% PE when it’s not moving??? Moving objects are

transferring PE into KE.• KE is you’re burning off all the PE that you built up. SO you’re transferring your PE

to your KE. You charge up your PE when you eat and use KE all through the day• Move a mm: you keep the KE for that period of time.• KE is movement and PE is basically stored up energy that can be released.• PE is something that has the potential to move and release its energy.• When you have KE and you’re moving up the mountain, PE is really high because

that’s all the energy stored up. And then you transfer it to KE when you go down really fast bc the PE was really great.

• The higher you get the more PE you get bc gravity adds more E. (positioning above ground level)

• SO the higher you are the more PE you can have? YES.• Comparing height with the ground

4th period

• PE• PE is stored energy bc the fan car had PE and it was stored in the battery (agrees) • The higher you are the more gravitational PE you have. Above surface level, it

has PE.• Types of energy: Chemical, electrical, gravitational, nuclear• How do you know something has KE?• Something is moving or using some sort of energy or just doing something in

general (agrees• (agrees) (Can KE turn into PE??)• Do we have KE? PE transfers (changes) to KE. • We do have KE bc we have PE that we use to be able to do everyday things.• In some way or another everyone has KE because KE is basically movement, so if

you move you have KE.• You can lose KE if you’re not moving. Something must first have PE in order to

have KE later.• KE = 0.5mv^2

3rd period

• KE can be transferred to another object• KE happens when you’re moving• PE is how high up something is (can be – gravitational PE)• KE PE usually can be developed when not moving because when you wind

something up (MT cars)• PE is energy of an object moving• Reversed – KE is an object moving• PE is sealed up energy – like roller coaster – if its slowly moving it has PE• Can KE and PE be used at the same time if there’s constant speed??? (What about

what we said before?)• They will still have KE because cells in their body are moving inside of them???• How can KE and PE be used?• Whenever there’s movement there’s KE. Whenever there’s not movement,

there’s PE???• PE is basically KE but in a suspended (paused, waiting) state???• KE has a greater mass or speed???

2nd period

• PE is E based on how high up you are on a certain slope (gravitational PE)• How do you get and lose PE and KE?• You have to have an added force (transfer of E) to get PE/KE• PE from eating? (humans)• PE is a stationary object that’s not in motion• KE is an object in motion• You get more KE with more PE• The greater the speed of an object the greater the KE• PE allows objects to fall (gravity)• E is associated with certain objects• PE turns into KE• KE can be passed onto other objects

• Marking the text/silent read – 5 mins.• Group reading next 5 mins. • (Seat 4 moderates – 1) begins the reading, 2) decides how

the group will read the article and 3) makes sure the reading gets done.)

• Practice Qs:

• 1. ChunDoong weighs 17 lbs and is sitting on a low wall 3 ft from the ground. What is his potential gravitational energy?

• 2. What are 3 different ways energy can be stored?

• 3. How does an object gain and lose KE?

2 Qs, 2 mins, VL 2• P. 138 (answer on today’s right side)• 1A. What kind of energy would the roller coaster car

gain if you lifted it to the top of the roller coaster?• 1B. How does it get this energy?

Right side chart

Question Predictions Observations

Where will the car be going at its fastest speed?

Where will it have its greatest KE?

Where will the car have both PE and KE?

How will the KE of the car compare between the high and low hills?