# All Science Fair Projects

## Skateboard bearings

### Abstract

Why are some skateboards more expensive than others? One of the factors influencing pricing, is the quality (and consequently, the price) of its bearings. This science fair project aims to find out how the the quality of the bearings of a skateboard affects its performance. Tests will be carried out on 5different types of bearings

### Hypothesis

The skateboard mounted with the most expensive bearings will travel the furthest..

### Scientific Terms

Bearings, sliding motion, friction

### Background

Bearings

Bearings work on the principle that an object will be easier to move by rolling than sliding. The motion of sliding is similar to skiing, where there will be a lot of friction produced. Friction will produce heat and also increase wear and tear on the surfaces. In order to slide, you will need to first overcome forces of friction. This friction can be reduced to a great extent by introducing rollers between the surfaces.

Bearings help to reduce friction and ease the movement between 2 surfaces. They make use of some metal balls that are placed between two smooth surfaces which consists of an inner ring and an outer ring. The metal balls help to carry the weight of the load and at the same time also allow the bearings to roll smoothly.

Bearings used in skateboards are subjected to a lot of abuse. This is because the skateboarders will normally push them to the extreme. Bearings will normally become weaker as their precision is improved. Therefore, when choosing the bearing for a skateboard, a balance must be sought between durability and precision.

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Complexity level:
5
Project cost (\$):
60
Time required:
1 hour for preparation, 1 day for science fair project
Material availability:
Easily found at a skateboard store
Safety concerns:

Basic safety requirements