"Can a small man lift a big man?" PPT courseware 2

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"Can a small man lift a big man?" PPT courseware 2

A seesaw is a simple lever

1.What is leverage?

2. Five elements of leverage:

Fulcrum Power Power Arm Resistance Resistance Arm

Seesaw balance

Question: How to balance the seesaw on both sides?

Method 1: Move the distance between the people on both sides and the fulcrum

Method 2: Change the weight of one side

Thoughts and Discussions

There are two adjustable nuts at both ends of the lever. What do they do?

Why is the lever required to be in a horizontal position when it is at rest?

Inductive conclusion

Function: Adjust the balance of the lever itself

Because in this way the value of the force arm can be read or measured directly on the lever.

Exchange and cooperation

Question: Are your experimental conclusions consistent with your hypothesis? What are your conclusions?

In short, the equilibrium condition for leverage is

F1·L1=F2·L2

This is the lever principle discovered by Archimedes.

Question exploration

Condition: Lever is balanced (as shown in the picture)

1. Remove the same mass of hooks from both ends. Is the lever balanced?

2. Move the hooks at both ends to the fulcrum by the same distance. Is the lever balanced?

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"Can a small man lift a big man?" PPT courseware 3:

"Can a small man lift a big man?" PPT courseware 3 Group discussion: Why can people with very different statures play the seesaw together? Balance of the Seesaw Question: How to balance both sides of the seesaw? Method 1: Move the distance between the people on both sides and the fulcrum Method..

"Can a small man lift a big man?" PPT courseware:

"Can a small man lift a big man?" PPT courseware Suppose there is a big stone blocking the way. We can't move it with our hands. We only have a wooden stick at hand. Is there any way you can move it away? 1. Definition: A hard rod that can rotate around a fixed point under the action of force 2. Composition: ..

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Update Time: 2024-11-22

This template belongs to science courseware Fourth-grade science volume 2 of the E-education edition industry PPT template

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