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Screw – Simple Machines

Physics | 7-14 yrs | Video, Animation

What is a Screw?

A screw is one of the most commonly used mechanical devices in the world. It is a machine that converts rotational motion into linear motion.

Why is a Screw a Simple Machine?

A screw has a long and thin metal shaft with threads spiralling along it’s length. It also has a turning head with a groove where a screwdriver can be used to rotate the screw.

The strength of a screw’s hold depends on the width of the threads and the distance between them. The closer and wider the threads, the stronger the hold will be.

However, more threads require more rotations to attach the screw and wider threads require more force in the rotations.

The mechanical advantage of the screw increases when the angle of the spiral increases.

The screw has become an integral part of the mechanical age.

It can be used to:

  • nut and bolt – Hold things together.
  • Car jack – Lift heavy loads.
  • Drill gun – Drill holes on objects.

For more such interesting Physics videos and articles visit our Physics for Kids category.


  1. This is a. Very good website. I saw this screw video on YouTube and i clicked on it i thaught this would be great for my project in school so i checked the website and it is great
    Thank you