Pulleys Simple Machines.

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Presentation transcript:

Pulleys Simple Machines

Pulleys are used to help lift heavy objects

What is a pulley?

What is a pulley? Pulley: a simple machine that is used to change the direction you have to apply force to move an object The more pulley’s you put together, the easier it becomes to move

They work by using a wheel, an axle, and a rope

force load The axle holds the wheel in place The wheel allows the rope to move around it smoothly The rope is pulled across the wheel and axle, making it easy to lift objects attached to the other side force load

What are some examples of pulleys you might see in your daily lives?

What are some examples of pulleys you might see in your daily lives?

Pulleys are used when objects are too large or difficult to pick up by hand Using a pulley allows you to change the direction you lift to move an object

Instead of trying to lift an object from the side, a pulley will allow you to lift it from the top This allows you to pull the object up with more strength because you can get all of your weight into it!

Types of Pulleys Fixed Pulley: this type of pulley is attached to a supporting structure and stays in place Movable Pulley: this type of pulley is able to move with the object being lifted Compound Pulley: this is when 2 or more pulleys are put together

Types of Pulleys fixed compound moveable

Compound Pulleys The more pulleys you put together, the higher the mechanical advantage of the pulley system Each extra pulley in a pulley system helps reduce effort needed by 1

Use different types of pulleys to lift different weights! Let’s try it! Use different types of pulleys to lift different weights! Write down your observations