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 knock-over 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 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=4.46N

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 ÷ 4.46N Output Force=3.88N

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=0.3m/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 0.1N

Step 9: Screw The marble rolls down the screw hitting the car F=mass x acceleration The marble hits the car with 0.7N

Step 10: Car to Cup The marble hit the car which rolls into the cup knocking it down The car needs 0.3N to be pushed over The cup needs about 1N to be pushed over