# Spring 2016 RoFi: Feet Material Verification Test

Christopher Andelin (Project Manager)

Mario Ramirez (Systems Engineer)

Qui Du (Manufacturing Engineer)

Andrew Laqui (Electronics and Controls Engineer)

Henry Ruff (Electronics and Controls Engineer)

## Feet Material Verification Test

Mario Ramirez (Systems Engineer)

### Requirement

Nonslip material on the bottom of RoFi’s feet shall have a friction coefficient of 0.9 +/- 0.05.

### Test Objective

To verify that the material on the bottom of RoFi’s feet has a friction coefficient of 0.9 +/- 0.05 with a laminated podium.

### Tools

Figure 1 shows the tools I used to calculate the friction coefficient of RoFi’s shoes.

Figure 1: Tools

### Preliminary Calculations

Figure 2 indicates the vectors involved in my experiment.

Figure 2: Incline Vectors  http://i.stack.imgur.com/lMCD8.png

μ = friction coefficient

Equation threshold where static object begins to move: m*g*sin(theta) = μ*m*g*cos(theta)

### Procedure

Step 1: Weigh desired mass and attach non-slip material.

Figure 3: Mouse Pad Attached to Mass

Step 2: Place mass and material on an incline.

Figure 4: Starting Location and Angle

Step 3: Tilt surface until slipping occurs and record the angle.

Figure 5: Mass Slipped

Step 4: Calculate friction coefficient using equation.

### Results

A second material was tested along side the mouse pad to show a difference in friction coefficients.

Figure 6: HD Non-Slip Pad

Figure 7: Mouse Pad

### Reference

http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Types-of-Forces

http://physics.stackexchange.com/questions/243717/why-does-something-on-an-inclined-plane-move-forward-at-all