Whenever $2$ solid objects, that are in physical contact, move relative to each other, frictional force emerges in the opposite direction of that motion. This frictional force is a function of two things; the normal force that is pressing these objects together and the static or dynamic coefficient of friction. This coefficient is dependent on the material pair that is contacting, for instance when a sheet of steel is rubbed against a concrete surface, the static coefficient of friction is $0\mathrm{.}5,$ but if the same sheet of steel is rubbed against a rubber surface, the static coefficient of friction is $0\mathrm{.}7.$ There are many ways to experimentally determine the static coefficient of friction between $2$ materials, one of them is know as the inclined plane method. The link below explains in detail how this process is done.

I need to design a device capable of measuring the coefficient of friction between an aluminum cube and various other materials using the inclined plane method.

The aluminum cube is $10$ mm X $10$ mm X $10$ mm and it will be used as the object that will slide down the inclined plane. $($Tolerance of $+/-1$ mm on this dimensions$)$

The surface on which the cube will slide most be interchangeable, so that we can experiment with different surface materials and determine the coefficient of friction between aluminum and other materials.

Restrictions:

This device cannot have any electrical components.

This device can have at most $5$ parts $($not including hardware to assemble the device$).$

This device must fit inside a box that is: Length $50$ cm X Width $30$ cm X Height $60$ cm$.$

This device must have a resolution of $0\mathrm{.}5.$

To assemble this device you can only use items sold in the McMaster Carr website.

The tightest tolerances allowed in this design are: $0\mathrm{.}5$ mm for distance measurements and $1$ mm for hole

diameters. Where:

These $2$ distance dimensions have valid tolerances:

$5\mathrm{.}0+/-0\mathrm{.}25$ mm or $5\mathrm{.}0+0\mathrm{.}0-0\mathrm{.}5$ mm$.($Max delta of $0\mathrm{.}5$ mm$)$

These $2$ distance dimensions have invalid tolerances:

$5\mathrm{.}0+/-0\mathrm{.}22$ mm or $5\mathrm{.}0+0\mathrm{.}0-0\mathrm{.}4$ mm$.($Delta smaller than $0\mathrm{.}5$ mm$)$

Don$`$t worry about tolerancing the diameter of threaded holes or threaded shafts.

The maximum interference you can have anywhere in the design is of $0\mathrm{.}1$ mm$.$ This means that $2$ parts can overlap at most a linear distance of $0\mathrm{.}1$ mm$.$

Deliverables:

$$ Drawing package containing:

o Assembly drawing showing exploded view, isometric view and parts list of your device.

$$ Part list must contain all hardware required to assemble device.

o One detailed mechanical drawing for all individual components $($except hardware

components$)$ Each drawing must contain:

$$ Part name matching part name in the parts list.

$$ All required dimensions, tolerances and views to fully specify that part