2. Styro-Geyser : EF 151 By: Chris Dunn, Alex Lewis, Michael Swift, John Mullen

3. Device Design Basic Materials: PVC Piping Electric Fan (disassembled) Pine Wood Copper Wiring Light Switch Various Screws, Nails, Pieces of Metal, Balls, and Miscellaneous Objects

4. Design Overview The device is instigated by a falling weight that is released from a hinged joint. This weight hits a pair of scissors which cuts a string. By cutting the string, a PVC pipe is released. This PVC pipe swings forward, contacting a balanced weighted spool.

5. Stored Energy Conservation of Energy : Falling weight m weight gh = ½ m weight v 2 Swinging PVC m PVC gh = ½ m PVC v 2 + ½ I PVC ω 2 Moving Spool m spool gh + W in = ½ m spool v 2 + ½ I spool ω 2

6. Stored Energy Con’t Center of Mass: Balanced weighted spool R = Σ m spool r/ Σ m spool Torque: Rotating PVC Στ = I α Conservation of Linear Momentum Rotating PVC strikes balanced spool I PVC ω = m spool vr Moving Spool contacts stationary light switch m spool ( Δ v spool ) = m switch ( Δ v switch )

7. Construction Issues The primary obstacle stemmed from rewiring the fan so that the light switch would turn the fan on/off This was solved by cutting and soldering copper wire to the fan and then wrapping it around the light switch to create a circuit.