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U2C2A3 RS p 162
Key Question: What happens to the energy in applied, friction and drag interactions? We Think page 162 #’s 1-2
Explore Your Ideas page 163
Explore Your Ideas Applied Part A: Energy Diagrams for Applied Interactions Step 1 page 163
Part A: #1 stored chemicalmotionApplied
You have 6 minutes to complete #s 2 – 4 on p 164 Read Step 2 #s 2-4 on p 164
Part A: #2Applied
Part A: #3Applied
Part A: #4Applied
Friction Part B: Energy Diagrams for Friction Interactions Step 1: Friction videovideo 5. In both cases, what was the evidence that a friction interaction had occurred?
evidence 5. In both cases, what was the evidence 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 6 minutes to complete #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: #11The source decreases in motion energy. The receivers increase in thermal energy. s Friction motion thermal
Drag Part C: Energy Diagrams for Drag Interactions Step 1: video - drag in air (Watch, then complete #’s 12-14)video
Part C:#12Drag car/parachute mechanical energy air decreases in motion energy increases in motion energy
Part C:#13Drag boat mechanical energy water decreases in motion energy increases in motion energy
Drag Part C: Energy Diagrams for Drag Interactions Step 3: Think about a rider on a bicycle. Bicycle riders experience a lot of drag!
Part C:#14Drag bike rider mechanical energy air decreases in motion energy increases in motion energy
You have 5 minutes to complete Make Sense of Your Ideas #s 1 - 3
Make Sense of Your Ideas Question 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 decreases in energy. The receiver increases in motion energy. Applied
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 decreases in motion energy. The receivers increase in thermal energy. motion Friction
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 InteractionRe-write your answer to #3. Drag
Question 3 Drag Interaction motion The source decreases in motion energy. The receiver increases in motion energy.
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).
RS U2C2A4 Elastic Interactions. We Think p 168 Answer #s 1-2.
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