"The Secret of Wheels and Axles" Tools and Machinery PPT Courseware 2

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"The Secret of Wheels and Axles" Tools and Machinery PPT Courseware 2

Question: If you remove the wheel on the faucet and twist the shaft directly, will it be easier to open the faucet?

Why?

How can verifying the existence of the axle save effort?

Use experimental testing

group discussion:

Combined with the leverage experiment in the previous class, think about how to design an experiment and what is needed? How to verify experimental results and save labor?

Experiment: The role of the wheel and axle

Purpose:

Is the axle labor-saving?

Experimental steps:

1. Assemble a wheel and axle experimental device.

2. Use hook codes to indicate resistance and force respectively. Determine who is the resistance and who is the force between the wheel and the axle? Observe how many weights are used on the axle and the wheel to balance the two ends of the axle?

3. Determine the criteria for judgment: the hook code is balanced when it is stationary in the air without external force.

Experimental requirements:

1. The recorded data must be true and valid.

2. The analysis must be well-founded, the conclusion must be scientific and reasonable, and written in complete words.

3. Clear division of labor between groups

4. Protect experimental equipment and pay attention to experimental safety.

Applications of wheels and axles in life

Think about it: Where are axles used in life?

Book P11

Find out, which part of them is equivalent to the wheel, and which part is equivalent to the axis?

Two conclusions:

It is less laborious to exert force on the wheel, and it is more laborious to exert force on the axle.

The axis remains unchanged, the larger the wheel, the less effort it takes, and the smaller the wheel, the more effort it takes.

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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.

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Update Time: 2024-10-07

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 1 industry PPT template

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