Screws Simple Machines. Screws are used to hold things together or to help lift heavy objects.

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Presentation transcript:

Screws Simple Machines

Screws are used to hold things together or to help lift heavy objects

What is a screw? Click here to load videohere on YouTube Click here to load videohere on mocomi.com

What is a screw?  Screw: a simple machine that is used to change circular motion into linear motion  As a screw twists, it is drawn forward

 The head of a screw is twisted, spinning the threads and causing the screw to move forward head threads

 The threads move into an object, pulling it together with the screw  The rotation of the screw makes the shaft move forward further into the object force motion

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

 Screws are used when there is very little space to move objects around  Using a screw allows you to move something forward or backward using circular movement

 Screws allow you to apply force while the simple machine remains in place  Even in tight spaces, large amounts of force can be generated!

Types of Screws  Threads: the spiral part of a screw that wraps around the central cylinder  Wider and closer threads give more strength to every twist!

Types of Screws large threadssmall threads

Let’s try it!  Use different types of screws to move different weights!  Write down your observations