SWBAT identify the frictional force acting on objects and determine the correct direction by analyzing a series of real world scenarios.
Do Now:
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Question 1
1.
How does friction impact a vehicle's change in speed or acceleration after a force is applied?
Guided Notes: Energy
Video :
The distance the puck travels depends on the strength of friction between the puck and the surface.
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Question 2
2.
Rank the (tile, carpet, and sandpaper) from strongest to weakest friction force:
________________. Strongest friction force
________________.
________________. Weakest friction force
A stronger friction force causes objects to stop quickly.
A weaker friction force cause objects to stop in a longer period of time.
Draggable item
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Corresponding Item
Tile
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Weakest Friction
Sandpaper
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Strongest Friction
Carpet
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Moderate Friction
Why did Vehicle 2 fall off the cliff in Claire’s test of the collision scene, but Vehicle 2 did not fall off the cliff in the film Iceworld Revenge?
Independent Practice:
Examine each evidence card. Annotate the cards to help you think about the evidence. Then, use the following questions as a guide for discussing each card.
What questions do you have about the information on the card?
What does the evidence tell you about how the force of friction might have affected each car’s velocity change?
What does the evidence tell you about how the mass of each car might have affected its velocity change?
Claim 1: The vehicles in Iceworld Revenge had different masses; in Claire’s test, the vehicles had the same mass.
Claim 2: The friction of the surface that was used in Iceworld Revenge was different from the friction of the surface in Claire’s test.
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Question 3
3.
What do you think might cause Vehicle 1 to slow down AND STOP before the collision?
"I think Vehicle 1 might slow down before the collision due to (mass or friction). This is because ...."
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Question 4
4.
How is the amount of friction Vehicle 1 experiences related to the impact of a collision?
"I know that friction impacts the force in a collision.. This is because ...."
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Question 5
5.
What conclusions can you draw from the fact that it moves only a little and does not fall off the cliff?
"If the car only moved slightly and does not fall off the clif this is from (mass or friction). This is because ...."
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Question 6
6.
What would the result be if Claire chose a mass of Object B that was too big or too small?
"If Claire chooses a mass too big it will _____. If Claire chooses a mass too small it will _____. This is because ...."
Exit Ticket:
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Question 7
7.
How could differences in friction cause changes in velocity after the collision?
"Differenes in friction will impact the speed of each collision because .... If there is more friction ____. If there is less friction ______"
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Question 8
8.
How could differences in mass cause changes in velocity after the collision?
"Differenes in mass will impact the speed of each collision because .... If there is more mass ____. If there is less mass ______"
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Question 9
9.
What material would you recommend Object A and B be for Claire? Assuming the ratio of the two vehicles were different masses in Iceworld Revenge compared to Claire’s test?
CFS:
accurately identifies the changes to each object in a collision
accurately describes the relationship between force, mass and velocity in a collision
accurately identifies the strongest source of evidence from the scientific data