"Pulley" Simple Machinery PPT Courseware 2

Description

"Pulley" Simple Machinery PPT Courseware 2

learning target

1. Understand fixed pulleys and movable pulleys.

2. Know the functions of fixed pulley, movable pulley and pulley block.

3. Be able to use and assemble pulley blocks as required.

4. Understand some applications of other simple machines.

Moving and fixed pulleys

Fixed pulley - a pulley with a fixed shaft

Moving pulley - a pulley whose shaft moves with the object

Experiment

1. Use a fixed pulley to pull an object. Observe the experiment carefully, the direction and size of your attention

2. Use the moving pulley to pull the object. Observe the experiment carefully, the direction and size of your attention.

3. Use fixed pulleys and movable pulleys to pull objects. Watch the experiment carefully, noting how far the object moves and how far the free end of the string moves.

The role of the pulley block (if the weight of the pulley and the friction between the rope and the pulley are ignored)

1. The pulley block uses several lengths of rope to lift the object. The force to lift the object is equal to a fraction of the weight of the object, that is (F=G/n).

2. The distance the hand pulls the rope through is equal to n times the distance the object rises, that is (s=nh).

How to wind the pulley block rope:

When n is an even number, the starting end (or end) of the rope is on the fixed pulley;

When n is an odd number, the starting end (or end) of the rope is on the moving pulley.

Want to discuss:

Simple machines such as levers and pulleys are either labor-saving or not; when using them, some can move shorter distances while others move longer distances. Through these simple mechanical learning, do you think it saves effort or effort, saves distance or wastes distance? What is the relationship between them?

Expand knowledge: axles and inclined planes

Simple mechanical motion also includes an axle and an inclined plane. The axle consists of a shaft and a large wheel. The inclined plane is something that everyone often comes into contact with. Below we give an example of a common axle and inclined plane:

Faucet (axle) Bicycle wheel (axle)

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For more information about the "Simple Machine Pulley" PPT courseware, please click on the Simple Machine PPT Pulley PPT tab.

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Update Time: 2024-10-13

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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