| Category | Format | Size |
|---|---|---|
| Fourth-grade science volume 2 of the E-education edition | pptx | 6 MB |
"The Function of the Rubber Cover on the Pen Holder" PPT Courseware 2
Description
"The Function of the Rubber Cover on the Pen Holder" PPT Courseware 2
Think about it: Do you prefer a ballpoint pen with a rubber cover or without one? Why?
Comparative Test:
Activity 1: Prepare two identical pens with a rubber cover on the pen barrel. Remove the rubber cover from one of the pens, and then try it with two pens: pinch one end of the pen barrel with one hand, and hold the end of the pen barrel with the other hand. Hold the penholder with your hand, slide it from one end to the other, compare your experiences over and over again, and tell me what different feelings you have.
The pen hand with the rubber cover is difficult to slide off, and it feels like there is a force that hinders sliding. The pen slips quickly without the rubber cover.
Activity 2: Press the two pens on the table with two hands and push them forward. What is the difference?
The pen with the rubber cover cannot be pushed, as if there is a force that hinders pushing. The pen pushes easily without the rubber cover.
When an object moves on the surface of another object, friction will occur at the contact surface of the two objects. The moving object will experience a force that hinders its movement. This force is called friction.
Activity experience:
1. Compare the feelings between gently wiping the tabletop with your hands and wiping the tabletop with a little force. What is the difference?
2. Wipe the desktop and the sandpaper surface with the same force. Compare the feelings. What is the difference?
How to measure the amount of friction:
We use a spring dynamometer to pull an object along the horizontal direction. The force just enough to make the object move is equivalent to the friction force it experiences.
The relationship between friction force and contact surface condition
Speculation: The surface of an object is smooth and the friction is small. The surface of an object is rough and the friction is large.
Conditions to change: Smooth tabletop vs. rough tabletop
Conditions that do not change: weight of the object, speed of pulling
Conclusion: The contact surface between objects is smooth and the friction is small; the contact surface between objects is rough and the friction is high.
Why should we lubricate the machine?
Why do gymnasts apply magnesium powder before competition?
Use the knowledge you have learned to solve the problem of driving a car in the snow.
1. What do you already know about friction?
2. What else do you want to know?
3. Want to know how to reduce the resistance of an object moving in air or water? Interested students can design experiments after class to continue research.
Keywords: teaching courseware on the role of the rubber cover on the pen holder, download the science PPT courseware for the second volume of the fourth grade in the E-education edition, download the science slide courseware for the fourth grade, download the PPT courseware on the role of the rubber cover on the pen holder, .PPT format;
For more information about the PPT courseware "The Function of the Rubber Cover on the Pen Holder", please click on the "The Function of the Rubber Cover on the Pen Holder" ppt tag.
"The Function of the Rubber Cover on the Pen Holder" PPT courseware:
"The Function of the Rubber Cover on the Pen Holder" PPT courseware Think about it: Why is there a rubber cover on the pen barrel of every pen? When an object moves on the surface of another object, friction will occur at the contact surface of the two objects, and the moving object will experience a force that hinders its movement. This...
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Update Time: 2024-07-23
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