Mr. Simple

Ashraf El-messidi, Chris Kilby, Travis Pearce, & Clayton Thomas

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.

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

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

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.

Thanks