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"Motion and Friction" Motion and Force PPT Courseware 2
1. Observe the soles of these two pairs of shoes. What do you find?
2. Think about what other things in life have textures on their surfaces?
(Fingerprints, car tire marks, lines on schoolbag straps, lines on hemp ropes, lines on mineral water bottles, etc.)
Three: What is the function of texture?
(Increase resistance, increase friction)
Four: What is friction?
Tips: 1. Think about what friction is?
(Objects are in close contact with each other and move back and forth.)
2. What happens when friction occurs?
(sound, heat, friction)
3. What are the conditions for generating friction?
(Two objects move in contact with each other)
4. What is the purpose of friction?
(Hindering the movement of objects)
Friction: When an object moves on the surface of another object, friction will occur at the contact surface of the two objects, so the moving object will experience a force that hinders its movement. This force is friction.
Take a test: Can friction be measured? How to measure?
Use a dynamometer to pull an object in the horizontal direction. The force just enough to make the object move is equal to the friction force it experiences.
Think about it: Why should we measure the force that just makes the object move?
(Measuring friction is generally the maximum static friction force experienced by the measured object)
Thinking: What is the relationship between the friction force exerted by the movement of an object?
Conjecture: (related to the condition of the contact surface; related to the weight of the object)
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"Motion and Friction" Motion and Force PPT download:
"Motion and Friction" Motion and Force PPT Download Part One Content: New Lesson Preliminary Study When an object moves on the surface of another object, friction will occur at the contact surface of the two objects, so the moving object will be subject to a force that hinders the movement. This force is called friction. ..
"Motion and Friction" Motion and Force PPT:
"Motion and Friction" Motion and Force PPT Part 1: Object Movement and Friction When an object moves on the surface of another object, friction will occur at the contact surface of the two objects, so the moving object will experience a force that hinders the movement. , this force is called friction..
"Motion and Friction" Motion and Force PPT Courseware 5:
"Motion and Friction" Motion and Force PPT Courseware 5 When an object moves on the surface of another object, friction will occur at the contact surface of the two objects. When friction occurs, a moving object experiences a force that hinders its movement. This force is called friction. We used a dynamometer along the water...