| Category | Format | Size |
|---|---|---|
| Science Edition for Sixth Grade Science Volume 1 | pptx | 6 MB |
"The Secret of Wheels and Axles" Tools and Machinery PPT Courseware 3
Description
"The Secret of Wheels and Axles" Tools and Machinery PPT Courseware 3
review:
1. What are the three points of leverage?
2. Under what circumstances does leverage save effort, effort, or neither?
Save effort - save distance; save effort - save distance
3. Is the hair scissors a labor-saving lever or a labor-saving lever?
A machine like a faucet where the wheel and axle are fixed together and can rotate is called an axle.
The faucet is a tool that every household has. It can effectively control the flow of water. I asked a classmate to turn on this faucet
Think: Which method saves effort?
1. Wrap a rope around the tip of the screwdriver. Hold the handle and rotate it so that the rope is wrapped around the tip.
2. Wrap a rope around the handle of the screwdriver. Hold the tip of the screwdriver and rotate it so that the rope wraps around the handle.
Comparing the force used by the above two axles to lift the same weight, what do we find from the data?
The wheel drives the axle, which saves effort. When the axes are the same, the larger the wheel, the more effort it takes.
It takes a lot of effort for the shaft to drive the wheel. When the axes are the same, the bigger the wheel, the harder it is.
Look around us, where are the axles used? What part of them is equivalent to a wheel? Which part is equivalent to the axis?
practise:
1. Which of the following machines belongs to the wheel and axle ( ).
A. Balance B. Scissors C. Wrench
2. Which of the following machines is a lever ( ).
A. Scissors B. Screwdriver C. Steering wheel
1. The larger the wheel on the axle, the more labor-saving it is ( )
2. The axle must exert force on the wheel to save effort ( )
3. When using a screwdriver, it takes less effort to hold it by the handle than by the tip ( )
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For more information about the PPT courseware "The Secret of Tools and Mechanical Wheels and Axles", please click the "Secrets of Tools and Mechanical Wheels and Axles" ppt tag.
"The Secret of Wheels and Axles" Tools and Machinery PPT teaching courseware:
"The Secret of Wheels and Axles" Tools and Machinery PPT Teaching Courseware Part One: Introduction of New Lessons The faucet is a tool that every household has, and it can effectively control the flow of water. Can anyone tell me why it can control the flow of water? Like faucets, wheels...
"The Secret of Wheels and Axles" Tools and Machinery PPT download:
"The Secret of the Wheel and Axle" Tools and Machinery PPT Download Part One: Preliminary Research A machine like a faucet, where the wheel and axle are fixed together and can rotate, is called a wheel and axle. (1) What is the function of the wheel axle? Discussion: If you remove the wheel of the faucet, directly...
"The Secret of Wheels and Axles" Tools and Machinery PPT:
"The Secret of the Wheel and Axle" Tools and Machinery PPT Part One: What is the function of the wheel and axle? If you remove the wheel on the faucet and directly twist the axle, will it still be easy to open the faucet? Think about the function of the axle. We can use an axle experimental device to study axles..
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Update Time: 2024-08-04
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