SAIL into STEM Friction using Car and Ramp and the Engineering Design Cycle.
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Transcript of SAIL into STEM Friction using Car and Ramp and the Engineering Design Cycle.
![Page 1: SAIL into STEM Friction using Car and Ramp and the Engineering Design Cycle.](https://reader038.fdocuments.net/reader038/viewer/2022110321/56649f585503460f94c7d160/html5/thumbnails/1.jpg)
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SAIL into STEM
Friction using Car and Ramp and the
Engineering Design Cycle
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Learning Goals
Use technology to measure and describe forces acting on a car in motion.
Define friction.Distinguish among various types of friction.
Design a sail car that will slow down or speed up a car undergoing friction
Explain applications of friction.
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Friction Friction is a force that resists the
motion of objects or surfaces. Many kinds
of friction exist.
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Friction
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Defining a “system”First we need to see how a car responds to unbalanced forces and identify the types of friction.
Set up your equipment and let’s see what we variables we can control.
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Setting up the experiment
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Friction and two surfaces Friction depends on both of the surfaces in
contact.
When the hockey puck slides on ice, a thin layer of water between the rubber and the ice allows the puck to slide easily.
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Friction and energy
Each time two moving surfaces touch each other, tiny bits of material are broken off by friction.
Breaking off bits of material uses energy.
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Identifying friction forces
Friction is a force, measured in newtons just like any other force.
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Sliding friction is a force that resists the motion of an object moving across a surface.
Identifying friction forces
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Collect Data
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Create the “Sail Car”
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Make a hypothesis
If the sail is affected by air friction, then the car’s speed will:
a) slow down by ______ %
b) speed up by ______ %
c) stay the same
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Collect Data for “Sail Car”
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Analyze any % change in Average Speed due to Air
Friction% increase = Trial 1 – Trial 2 x 100%
Trial 1
% decrease = Trial 2 – Trial 1 x 100% Trial 1
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Friction and energy
Friction changes energy of motion into heat energy.
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Reducing the force of friction
Unless a force is constantly applied, friction will slow all motion to a stop eventually.
It is impossible to completely get rid of friction, but it can be reduced.
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Using friction
Friction is also important to anyone driving a car.
Grooved tire treads allow space for water to be channeled away from the road-tire contact point, allowing for MORE friction in wet conditions.
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Using friction Shoes are designed
to increase the friction between their soles and the ground.
How do you think these shoes increase friction?
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Modify your “Sail Car”
Use materials to make modifications to the sail.
Increase your friction by 10% or decrease your friction by 10%