"Lever" Simple Machine Function PPT Courseware 3

Description

"Lever" Simple Machine Function PPT Courseware 3

learning target

1. Understand levers through common tools in life, and identify levers from common tools and simple machines.

2. Be able to understand several concepts related to leverage through hands-on practice.

3. Learn to draw the power arm and resistance arm through practice.

1. Preliminary understanding of leverage

Think: What are the common characteristics in their work?

Common characteristics of leverage

powerful effect

Rotate around a fixed point

Lever definition: A hard rod that can rotate around a fixed point under the action of force.

Note: The lever can be straight or curved.

The fixed point can be in the middle or at one end

2. Understand several concepts of leverage:

Five Elements of Leverage

Fulcrum The fixed point around which the lever rotates, represented by o.

Power is the force that causes the lever to rotate, represented by F1.

Power arm The distance from the fulcrum to the power action line is represented by L1.

Resistance is the force that hinders the rotation of the lever, represented by F2.

Resistance arm The distance from the fulcrum to the resistance line, represented by L2.

How to practice the five elements of leverage

The first is to find the fulcrum, the second is to find the strength

Three lines of action of drawing force,

4. Draw a perpendicular line from the fulcrum,

The moment arm is this line segment.

practise

1. Draw the five elements of a shovel when used in the picture

2. Draw the power arm and resistance arm of each lever in the picture.

Class Summary

1. Definition:

2. Five elements of leverage: fulcrum, power, resistance, power arm, resistance arm

How to draw the moment arm:

One is to find the fulcrum, the other is to find the strength

Three lines of action of drawing force

4. Draw a vertical line from the fulcrum

5. Use curly brackets to outline the moment arm and indicate it with the letters L1 or L2.

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For more information about the "Lever Simple Mechanical Work" PPT courseware, please click the Lever PPT Simple Mechanical Work PPT tab.

"Lever" Simple Machine PPT download:

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File Info

Update Time: 2024-09-30

This template belongs to Physics courseware Lu Jiao Edition Eighth Grade Physics Volume 2 industry PPT template

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