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2 Tutorials that teach Simple Machines: Screw
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Simple Machines: Screw

Simple Machines: Screw

Author: Nathan Lampson
Description:

This lesson will explain how to calculate the mechanical advantage of a screw.

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Tutorial

 

A screw is a simple machine where an inclined plane is wrapped around a cylinder.  The mechanical advantage created by a screw is based on the closeness of the threads of a screw.  A mechanical advantage is when an input force is amplified by the use of a tool.  

In order to calculate the mechanical advantage of a screw, take the length of the threads divided by the length of the screw.

Ideal Mechanical Advantage = Length of Threads / Length of Screw

Example:

If the length of the threads of a screw are 6cm long and the length of a screw is 3cm long, what is the mechanical advantage of the screw?

 

Length of Threads = 6cm

Length of Screw = 3cm

 

Ideal Mechanical Advantage = Length of Threads / Length of Screw

Ideal Mechanical Advantage = 6cm / 3cm

Ideal Mechanical Advantage = 2

 

The screw in our example is able to amplify the input force by two times.