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U2C2A3 RS p 162
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Key Question: What happens to the energy in applied, friction and drag interactions? We Think page 162 #’s 1-2
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Explore Your Ideas page 163
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Explore Your Ideas Applied Part A: Energy Diagrams for Applied Interactions Step 1 page 163
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Part A: #1 stored chemicalmotionApplied
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You have 6 minutes to complete #s 2 – 4 on p 164 Read Step 2 #s 2-4 on p 164
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Part A: #2Applied
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Part A: #3Applied
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Part A: #4Applied
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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?
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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….
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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?
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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?
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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.)
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Part B: #8
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Part B: #9
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Part B: #10
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Part B: #11The source decreases in motion energy. The receivers increase in thermal energy. s Friction motion thermal
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Drag Part C: Energy Diagrams for Drag Interactions Step 1: video - drag in air (Watch, then complete #’s 12-14)video
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Part C:#12Drag car/parachute mechanical energy air decreases in motion energy increases in motion energy
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Part C:#13Drag boat mechanical energy water decreases in motion energy increases in motion energy
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Drag Part C: Energy Diagrams for Drag Interactions Step 3: Think about a rider on a bicycle. Bicycle riders experience a lot of drag!
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Part C:#14Drag bike rider mechanical energy air decreases in motion energy increases in motion energy
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You have 5 minutes to complete Make Sense of Your Ideas #s 1 - 3
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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.
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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.
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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.
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Question 1 - Applied Interaction motion The source decreases in energy. The receiver increases in motion energy. Applied
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In an applied mechanical interaction, the energy from the receiver often gets transformed into motion energy of the source.
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Question 2 - Friction Interaction thermal Receivers The source decreases in motion energy. The receivers increase in thermal energy. motion Friction
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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).
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Question 3 - Drag InteractionRe-write your answer to #3. Drag
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Question 3 Drag Interaction motion The source decreases in motion energy. The receiver increases in motion energy.
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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).
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