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Authoritative PPT Summary
"Scientific Inquiry: Friction" Familiar and Unfamiliar Forces PPT Courseware 2
1. Friction
sliding friction
static friction
rolling friction
sliding friction
The force that hinders the relative motion of an object when one object slides on the surface of another object is called sliding friction.
2. Factors affecting the magnitude of friction
Experimental exploration
What factors are related to the magnitude of sliding friction?
Conjectures and Assumptions
It may be related to the roughness of the contact surface
It may be related to the pressure on the contact surface
It may be related to the size of the contact surface
It may be related to the speed of movement
May be related to the direction of movement
Analysis and argumentation
1. The magnitude of sliding friction is related to the roughness of the contact surface. The rougher the contact surface, the friction force _____.
2. The size of sliding friction is related to pressure. The greater the pressure, the greater the friction.
Discussion: If there was no friction in life
Friction is closely related to our lives, and friction is not always harmful. Next, I asked the students to continue discussing what would happen if there was no friction in our lives. Students are required to complete a mini experiment after class and write a short paper based on the discussion content "If there is no friction in life".
In conclusion
Learn from this lesson: What did you learn? On the basis of the students' summary, I make appropriate supplements.
Classroom testing
1. The force that hinders the movement of an object when it is not moving on another physical surface is _______.
2. The factors that affect the sliding friction force include (1) _______ between the contact surfaces; (2) _______ of the contact surfaces.
3. Methods to increase friction include: _______ and _______.
4. Methods to reduce friction include: making the contact surface _______, using _______ instead of _______ or making the contact surface _______, etc.
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"Scientific Inquiry: Friction" Familiar and Unfamiliar Forces PPT Courseware 4:
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"Scientific Inquiry: Friction" Familiar and Unfamiliar Forces PPT Courseware 3:
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"Scientific Inquiry: Friction" Familiar and Unfamiliar Forces PPT Courseware:
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