"Lever" Simple Machine Function PPT Courseware

Description

"Lever" Simple Machine Function PPT Courseware

think about it

Why can a child lift a huge cow?

learning target

(1) Understand leverage and be able to identify it from common tools;

(2) Understand the five elements and schematic diagram of leverage;

1. What is leverage?

Want to discuss

The following are several types of machinery in life. Can you tell what they have in common?

A hard rod that can rotate around a fixed point under the action of force is called a lever

Use this diagram to learn the meaning of concepts based on their labeled names.

Fulcrum: A fixed point about which a lever rotates.

Momentum: The force that causes a lever to turn.

Resistance: The force that resists the rotation of a lever.

Power arm: The distance from the fulcrum to the line of action of the power.

Resistance arm: The distance from the fulcrum to the line of action of resistance.

Combining the concept of leverage and its elements, and following the prompts, try to summarize how to draw a schematic diagram of a lever.

Summarize

(a) Find the action point "O" of the force based on the effect of the given graphic combined with the force.

(b) Draw the power, power arm, resistance, and resistance arm according to the effect of the force (the minimum distance between the line of action of the holding force and the fulcrum is the moment arm).

Example analysis

1. In the lever as shown in the picture, the power arm is represented by L. The correct force arm drawn in the picture is ( )

Analysis: In the above four pictures, according to the drawing method of the force arm, it is the minimum distance from the extended line of action to the fulcrum. It can be seen that A, B, and C do not meet the requirements, so D is selected.

2. Draw the moment arms of each force in the figure below.

Analysis: According to the shortest distance from the extension line of the force to the fulcrum, the moment arm can be drawn as shown in the figure below.

Summary of this lesson

What did you learn from this lesson?

The concept of leverage

A hard rod that can rotate about a fixed point under the action of force.

Elements of Leverage

Fulcrum, power, power arm, resistance, resistance arm

Schematic diagram of lever

(1) Find the fulcrum

(2) Draw the extension line of the force

(3) Mark the shortest distance from the extension line to the fulcrum

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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.

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File Info

Update Time: 2024-12-04

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

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