EF 151 Final Project Rube-Goldberg device

Our Team Mitch Groothuis Mitch Groothuis Kelly Bradshaw Kelly Bradshaw Ryan Hopson Ryan Hopson James Burrell James Burrell

Mini Cooper Launcher

Device Purpose This device will launch a Mini Cooper Hot Wheels car at a high velocity. This device will launch a Mini Cooper Hot Wheels car at a high velocity. The Mini can be launched into any object. The Mini can be launched into any object. Can be used as a mini wrecking ball. Can be used as a mini wrecking ball.

Step One Weight falls Weight falls Pulleys and string raise the elevator Pulleys and string raise the elevator Marble dumps from elevator into funnel Marble dumps from elevator into funnel

Step Two Small Marble rolls through pipe Small Marble rolls through pipe Small Marble collides with Large Marble and falls down reload pipe Small Marble collides with Large Marble and falls down reload pipe Large Marble collides with Bouncy Ball Large Marble collides with Bouncy Ball

Step Three Bouncy Ball falls through pipe Bouncy Ball falls through pipe Ball collides with scissors Ball collides with scissors

Step Four Scissors cut string Scissors cut string Springs launch Mini up the ramp and into the air Springs launch Mini up the ramp and into the air

Energy Conversions Step One – GPE of the Weight raises the marble elevator and is transferred into GPE of the Small Marble Step One – GPE of the Weight raises the marble elevator and is transferred into GPE of the Small Marble Step Two – GPE of the Small Marble is transferred into KE as it rolls, collision transfers into KE of the Large Marble, which transfers into KE of the Bouncy Ball Step Two – GPE of the Small Marble is transferred into KE as it rolls, collision transfers into KE of the Large Marble, which transfers into KE of the Bouncy Ball

Energy Conversions (cont.) Step Three – KE of Bouncy Ball increases with GPE as it falls through pipe Step Three – KE of Bouncy Ball increases with GPE as it falls through pipe Step Four - KE of Bouncy Ball closes the scissors on the string to release EPE that is stored in the springs of the launcher. KE of the launching block is transferred into KE of the Mini. Step Four - KE of Bouncy Ball closes the scissors on the string to release EPE that is stored in the springs of the launcher. KE of the launching block is transferred into KE of the Mini.

Conclusions Input – GPE of Weight = 2.83 Joules Input – GPE of Weight = 2.83 Joules Output - KE of Car = Joules Output - KE of Car = Joules Estimated Launch Speed = 3.1 m/s Estimated Launch Speed = 3.1 m/s