Friction

**__Which kind of trainer is the best to wear while doing PE?__** Discussing style, colour, mark and whether they are new or not began the investigation. We decided that none of these were really the most important things to consider (much as we prefer certain types of new shoes).We decided it was probably something to do with the bumps and ridges on the soles.

__**Starting to compare shoes.**__ We completed a wax crayon rubbing of our shoes so that we could compare the number, shape and depth of the bumps and ridges on the soles of our shoes. Some were photographed to help in our comparison too.We considered how a shoe needs to grip the floor, the force of movement being resisted by contact with the ground. We decided shoes that slip badly are best for sport. With this in mind we progressed to our Fair Test.

**__Measuring Differences between shoes.__** Discussion concluded that the same amount of push is needed when comparing the sports shoes, with either different shoes on the same surface or the same shoe on different surfaces. Which was the best way of finding the best foot ware was left to our conclusions.

We established Research Groups, being clear on what our investigation was by: __**An example.**__
 * writing the statement we were testing;[[image:bisb-science/DSC00808.JPG width="180" height="320" align="right" caption="DSC00808.JPG"]]
 * the variables we were keeping the same;
 * the variable we were changing;
 * and the variable we were measuring.
 * writing the statement we were testing;
 * Shoes with more bumps and ridges on the sole slide less far than those with fewer.
 * the floor we are pushing the shoe along,
 * the way we start the shoe moving along the floor,
 * the starting line and part of the shoe we measure between to find the distant slid.


 * the variable we were changing;
 * the shoes we are sliding

>>
 * and the variable we were measuring.
 * the distance each shoe slides

This is the wall display including elements of the investigation we carried out. As you can see, we started by considering forces, and investigated air resistance using parachutes we created, as well as wondering about sports shoes.