Rube Goldberg Project The Yahtzee Roller Project History
Rube Goldberg Project The Yahtzee Roller
Project History: Problems
Levers • Levers would hit and twist changing the angle • The ball would then fall in the wrong spot • Most challenging part of the machine
Golf Ball Fall • The golf ball would fall into one side of the cup tilting the cup making the ball fall out • This wouldn’t give us enough force to pull the wedge and knock the cup over
The Wedge • The marble would not roll out of the knockover cup • As well as the wedge would be pulled right from under the cup • Second most challenging part of the machine
Project Evolution
First Day
Day Two
Day Three
Day Four
Day Five
Day Six
First Sketch
Blueprint Schematics
Calculated Physics • • • Explained physics of each step Using different equations we learned in class Work=Force x Distance Velocity=Distance ÷ Time MA= Output Force ÷ Input Force=Mass x Acceleration
Step 1: The Beginning Pulley • Used a pulley with a mechanical advantage of 1 • All the force we exert using the pulley transfers to the first domino • MA=output force ÷ input force
Step 2: Dominos & Golf Ball • All of the kinetic energy is transferred to the next domino • Force= Mass x Acceleration • Force=4. 46 N
Step 3: Golf Ball Lever • The golf ball falls onto the lever pushing it down knocking the next lever up • MA=input distance÷ output distance • Mechanical advantage of the first lever is 1. 15 • . 87 =OF ÷ 4. 46 N • Output Force=3. 88 N
Step 4: Marble Lever • The First lever hits the second lever tilting the lever downward releasing the marble • MA=Input Distance÷ Output Distance • MA=1. 84
Step 5: Incline Plane Compilation • The Ball rolls down the incline plane • The inclined plane has a mechanical advantage of 1. 22 • MA=Output Distance÷ Output Distance
Step 6: Single Incline Plane • The marble rolls down the incline plane hitting the golf ball • Velocity=Distance ÷ Time • Velocity=0. 3 m/s
Step 7: Pulley • The Golf Ball falls into a cup pulling on the pulley pulling out a wedge • The Mechanical advantage is the number of ropes not including the downward pull rope • So the mechanical advantage is 1
Step 8: Wedge • The wedge is pulled out by the pulley knocking over a cup • The force required to pull it out is 0. 1 N
Step 9: Screw • The marble rolls down the screw hitting the car • F=mass x acceleration • The marble hits the car with 0. 7 N
Step 10: Car to Cup • The marble hit the car which rolls into the cup knocking it down • The car needs 0. 3 N to be pushed over • The cup needs about 1 N to be pushed over •
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