Mr. Simple

1. Mr. Simple Ashraf El-messidi, Chris Kilby, Travis Pearce, & Clayton Thomas

2. Overview This device performs several steps to complete the simple task of displaying a banner. A hammer swings from its resting position to hit a marble. This ball rolls down multiple ramps, changing direction along the way. Finally the ball hits a car, which rolls down a track, displaying our banner.

4. Concepts • Conservation of Translational Energy • Ball falling and rolls • Conservation of Rotational Energy • Rotating hammer hits ball at rest • Conservation of Linear Momentum • Ball hits car • Rotational Motion • Hammer Swinging • Center of Mass • Car rest with over half of body over the edge

5. Calculations • Velocity of hammer • Gh=.5v^2 + .5Iw^2 • V=11 ft/sec = 29.3 radians/sec • Initial Velocity of ball • m1v1+m2v2=m1v1’+m2v2’ • V of ball=12.36 ft/sec • Other calculations could not be performed because the coefficient of restitution could not be found for the ball hitting the car

6. Cost/Conclusion • Nothing was purchased. The following is a list of estimated cost. • Toy car: $2 • Scrap wood: $4 • Marble: $1 • Paper, string, cardboard, and other small items: $2 • Most expensive purchase was a 4 pack of sharpies that included the orange sharpie we needed. This was $6 • Total Cost: $15 • This was the most effective, consistent, and cost efficient design we could build.

7. Thanks