Friction
Presentation
•
Physics, Science
•
7th Grade
•
Hard
Roxana Nicolae
Used 10+ times
FREE Resource
12 Slides • 14 Questions
1
Friction
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Select
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Open Ended
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Today it is COLD
What's he doing with his hands?
Why?
8
His hands will become warm after he rubs them together
The name of this force is friction
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Friction
Friction is a force that appears when two objects are in contact (touching)
When the boy pushes the box, friction pushes back in the opposite direction
The box will only move if the pushing force is greater than the friction force
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Why don't the cars slide down the hill?
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The direction of friction
Friction acts to oppose motion
To draw the force arrow to represent friction, we need to first think: "which way is the object trying to move?"
In this picture, the heavy box will try to move down the hill. Therefore, friction acts up the slope.
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Open Ended
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Measuring friction
What is the name of the instrument in the picture?
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Use the forcemeter to measure the force of friction.
If you pull the wooden block attached to the forcemeter, you will see the value of the force needed to move the block (measured in what unit???)
16
If you made these changes to the experiment, what differences would you expect to see when you measure the force of friction?
17
Imagine the road is made of glass or ice. What would happen to the cars? Why?
What differences between asphalt and glass may cause this?
What does this tell you about friction?
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Multiple Choice
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Multiple Choice
This car is turning, but there’s a puddle of water in the road. Which diagram best shows how the puddle will affect the path of the car after it hits the puddle?
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Friction
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