| Category | Format | Size |
|---|---|---|
| Beijing Normal University eighth grade physics volume 2 | pptx | 6 MB |
"Exploration - What does the magnitude of frictional force have to do with" Motion and Force PPT Courseware 5
Description
"Exploration - What does the magnitude of frictional force have to do with" Motion and Force PPT Courseware 5
Activity 1: Place the wooden block (a substitute for the car) on the table and push it to make the car move on the table. The car will eventually ________. Why?
Press your palm on the table and drag it slowly. How does your hand feel?
Activity 2: Tim rice with chopsticks
1. Friction
1. Definition: When two objects in contact with each other move relative to each other, a force will be generated on the contact surface that hinders relative movement. This force is called friction.
Based on the definition, think about the following 3 questions:
1. What are the conditions for friction to occur?
2. What is the effect of friction?
3. The direction of friction?
Explore: Factors affecting the magnitude of friction
1. Ask questions:
What factors are related to the magnitude of friction?
2. Conjectures and assumptions:
The magnitude of friction may be related to...
The magnitude of friction may be related to...
The magnitude of friction may be related to...
The magnitude of friction may be related to...
The magnitude of friction may be related to...
3. Experimental methods:
Control Variable
4. Experimental ideas:
⑴How to measure friction?
⑵How to change the pressure?
⑶How to change the roughness of the contact surface?
⑷How to control variables?
⑸What data needs to be recorded?
Design Experiment 1: The amount of friction may be related to the amount of pressure
Control variables: The roughness of the contact surface and other factors are the same, but the pressure is different.
Design experiment 2: The size of the friction force may be related to the roughness of the contact surface
Control variables: The pressure and other factors on the surface of the object are the same, but the roughness of the contact surface is different.
Experimental results
1. The size of the friction force is related to the pressure acting on the surface of the object. The greater the pressure on the surface, the greater the friction force.
2. The size of the friction force is also related to the roughness of the contact surface. The rougher the contact surface, the greater the friction force.
Friction summary
Size: the size of the pressure, the roughness of the contact surface
Direction: Opposite to the relative motion of an object
Effect: hinder the relative movement of objects
Existence: When two objects in contact with each other move relative to each other or are relatively stationary and have a tendency to move relative to each other
practice
1. Regarding friction, which of the following statements is correct ( )
A. Friction always hinders the movement of objects
B. Friction always hinders the relative movement of objects.
C. The smoother the contact surface of an object, the greater the friction force.
D. We often use the method of reducing pressure to increase friction.
2. Several students are competing in a pole-climbing competition on the playground. The force that enables them to rise is ( )
A. Gravity
B. Friction
C. Elasticity
D. The pulling force of the rod
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For more information about the PPT courseware "Motion and Force to Explore What the Size of Friction is Related to", please click the Motion and Force ppt to Explore What the Size of Friction is Related to ppt tag.
"Exploring - What does the magnitude of frictional force have to do with" Motion and Force PPT Courseware 4:
"Exploring what the magnitude of friction is related to" Motion and Force PPT Courseware 4 Friction in Life 1. Why can people glide quickly on the ice? 2. Why can people skate on cement surfaces? 3. Why do car tires often have concave and convex patterns? 4. Football...
"Exploring - What does the magnitude of frictional force have to do with" Motion and Force PPT Courseware 3:
"Exploring what the magnitude of friction is related to" Motion and Force PPT Courseware 3 Self-study textbook answers: 1. What is sliding friction? 2. What is sliding friction? 3. What are the conditions for the generation of sliding friction? 4. What is static friction? Rolling friction? ..
"Exploration - What does the magnitude of frictional force have to do with" Motion and Force PPT Courseware 2:
"Exploring what the magnitude of friction is related to" Motion and Force PPT Courseware 2 Self-study textbook answers: 1. What is sliding friction? 2. What is sliding friction? 3. What are the conditions for the generation of sliding friction? 4. What is static friction? Rolling friction? ..
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Update Time: 2024-08-02
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