U2C2A3 RS p 162. Key Question: What happens to the energy in applied, friction and drag...
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Transcript of U2C2A3 RS p 162. Key Question: What happens to the energy in applied, friction and drag...
U2C2A3 RSp 162
Key Question: What happens to the energy in applied, friction and drag interactions?
We Thinkpage 162
#’s 1-2
Explore Your Ideas
page 163
Explore Your Ideas
Part A: Energy Diagrams for AppliedApplied Interactions
Step 1
page 163
Part A: #1
stored chemical motion
AppliedApplied
You have You have 6 minutes6 minutes to to complete #s 2 – 4 on p 164 complete #s 2 – 4 on p 164
Read Step 2 #s 2-4
on p 164
Part A: #2
AppliedApplied
Part A: #3
AppliedApplied
Part A: #4AppliedApplied
Part B: Energy Diagrams for FrictionFriction Interactions
Step 1: Friction video
5. In both cases, what was the evidence that a friction interaction had occurred?
5. In both cases, what was the evidenceevidence that a friction interaction had occurred?
Rubbing hands: There was a change in….
Wooden block rubbed along table: There was a change in….
Now it’s your turn!
Step 2: Rub the palms of your hands together.
6. What is the evidence that a friction interaction is occurring?
Step 3: Gently shove one of your books so that it moves across your desk. There is a friction interaction between the book and the desktop.
7. What do you observe?
You have You have 6 minutes6 minutes to to complete #s 8 - 11complete #s 8 - 11
Read p.p. 165-166 to answer #’s 8-11 (Do Not move on to Part C.)
Part B: #8
Part B: #9
Part B: #10
Part B: #11
The source The source decreases in decreases in motion energy.motion energy.
The receiverThe receiverss increase in increase in thermal energy.thermal energy.
s
FrictionFriction
motionmotion thermalthermal
Part B: #11
Part C: Energy Diagrams for DragDrag Interactions
Step 1: video - drag in air (Watch, then complete #’s 12-14)
Part C:#12DragDrag
car/parachutemechanical
energyair
decreases in motion energy
increases in motion energy
Part C:#13DragDrag
boatmechanical
energywater
decreases in motion energy
increases in motion energy
Part C: Energy Diagrams for DragDrag Interactions
Step 3: Think about a rider on a bicycle. Bicycle riders experience a lot of drag!
Part C:#14DragDrag
bike ridermechanical
energy air
decreases in motion energy
increases in motion energy
You have You have 5 minutes5 minutes to to complete complete Make Sense Make Sense of Your Ideasof Your Ideas #s 1 - 3 #s 1 - 3
Make Sense of Your IdeasQuestion 1
1. In general, what evidence shows that an applied interaction has occurred?
The receiver
increases
in motion energy.
Make Sense of Your Ideas Question 2
2. In general, what evidence shows that an friction interaction has occurred?
The receivers
increase
in thermal energy.
Make Sense of Your Ideas Question 3
3. In general, what evidence shows that an drag interaction has occurred?
The receiver
increases
in motion energy.
Question 1 - Applied Interaction
motion
The source The source decreases in decreases in energy.energy.
The receiver The receiver increases in increases in motion motion energy.energy.
AppliedApplied
In an applied mechanical interaction, the energy from the receiver often gets transformed into motion energy of the source.
Question 2 - Friction Interaction
thermal
Receivers
The source The source decreases in decreases in motion motion energy.energy.
The receiverThe receiverss increase in increase in thermal thermal energy.energy.
motion
FrictionFriction
Question 2
•In a friction interaction, the energy source (motion energy) gets transformed into thermal energy of the receivers (both surfaces rubbing against each other).
Question 3 - Drag Interaction
Re-write your answer to #3.Re-write your answer to #3.
DragDrag
Question 3Drag Interaction
motion
The source The source decreases in decreases in motion motion energy.energy.
The receiver The receiver increases in increases in motion motion energy.energy.
motion
Question 3
•In a drag interaction, the energy of the source (motion energy) gets transformed into motion energy of the receiver (the gas or liquid the source is in).