"Pulley" PPT

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"Pulley" PPT

Part One: Knowledge Exploration

Exploration 1

How many ways can you use a pulley to lift an object? What are the characteristics when using it?

When the pulley is in use, it is divided into fixed pulley and movable pulley according to whether the position of the shaft moves.

When in use, the shaft is fixed and is called a fixed pulley.

When in use, the shaft and the weight move together, called the pulley.

Exploration 2

Fixed pulley: It cannot save effort, but it can change the direction of force.

Moving pulley: It can save effort, but it cannot change the direction of force.

Can we use the advantages of fixed pulleys and movable pulleys to combine them to make them labor-saving and convenient?

Part Two: Intellectual Exercises

1. Fill in the blanks

1. The movable pulley and the fixed pulley are combined to form ( ).

2. The pulley combination combines the advantages of the movable pulley and the fixed pulley, and can both ( ) and ( ).

3. Pulleys can be divided into ( ) ( ), ( ) according to different assembly methods.

4. The more movable pulleys in the pulley block, the more ( ).

2. Multiple choice questions

1. The fixed pulley and the movable pulley are used together to form ( ).

A. Fixed wheel set B. Moving wheel set C. Pulley set

2. The pulley block consists of ( ) and other parts.

A. Fixed pulley, movable pulley and rope B. Several movable pulleys and ropes C. Several fixed pulleys and ropes

3. Cranes are used ( ) to lift heavy objects.

A. Fixed pulley B. Moving pulley C. Pulley block

4. The number of pulleys in the pulley block is ( ).

A. Must be 1 B. Must be 2 C. 2 or more

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Update Time: 2024-11-22

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 1 industry PPT template

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