## Monday, November 18, 2013

### Scientific Analysis and Description/Picture of Machine

This Rube Goldberg machine exhibits many scientific aspects. This can be shown starting from the beginning when the object hits the wall (it is thrown so it has applied force acting upon it), pushing it against the ball. This shows a transfer in momentum (Seretis). Then, when the ball is pushed and starts to roll down the inclined plane, it picks up speed due to acceleration of gravity on an incline (a simple machine) ("Determining g on an Incline" 1). This ball then hits another ball, transferring energy again, causing the ball to roll into the cup on the pulley system (a simple machine). The added weight to the cup allows this cup to move downwards, bringing the other cup up. This demonstrates a change in potential energy to kinetic energy on the cup moving down (a transfer of energy), and kinetic energy to potential energy on the cup moving upwards at least 35cm (a transfer of energy). Kinetic energy is energy in motion while potential energy is the possible energy of an object (Seretis). Therefore, when the cup is at the highest point of the pulley system, it has the maximum amount on kinetic energy, and when it starts to move the potential energy changes into kinetic energy, and vise versa. The other cup hits the first class lever. This force acted upon one side of the first class lever (in which the direction of input force is opposite from the output force) causes the other side of the lever (a simple machine) to go down, making a train car on the lever roll down (due to gravity) (Seretis). The train car has wheels which have axles, so it is also a simple machine. The train car hits a series of dominoes which transfer momentum into each other to fall. These dominoes hit a pendulum, which swings (showing centripetal force, as it is keeping in a circular arc of motion) (Seretis) and hits more dominoes, which fall on a ball. This ball starts to roll, having frictional force act against it as two objects are rubbing together (the ball and the table) (Seretis), and it hits more dominoes which fall into a train car which rolls and hits more dominoes which fall and hit a golf ball. The golf ball hits a wedge (another simple machine used to push in between objects) (Seretis). The wedge is in between a basketball and a table. When the wedge moves, it causes the basketball to roll off the table. This basketball is attached to a jenga box. When the basketball falls, due to the gravitational force acting upon it (Seretis) it causes the jenga box to also fall off the table as the momentum is too great for the jenga box to counteract it. Also, the jenga box falls due to tension force as the string has enough tension to pull it along with the basketball (Seretis). This shows gravity to kinetic as the gravity is acting as the potential energy (gravitational potential energy) to transfer into kinetic energy (a transfer of energy) (Seretis). This combined weight causes a switch that was attached to the jenga box to flip, releasing an electric toy train (electric to kinetic- the electricity is making the kinetic energy) to move (a transfer of energy) (Seretis). This car then moves towards a book, and it hits a wedge between the book and the piano bench. The book falls off the table, hitting the end of a basket (with a rat on the side not hit). The box falls over because of the unbalanced weight, and the rat flies off and hits another book, causing it to fall over. This falling book hits a tennis ball, which starts to roll. The tennis ball runs into marbles, causing them to roll over the bump keeping them from falling. All of the balls roll down and hit a small bowl with a wedge underneath it, causing it to tip and deposit cookies into a bowl. The simple task this machine completes is putting cookies in the bowl. The name of this machine is "How to Give a Musical Cat a Treat".

Works Cited
Seretis, Elaine. "Independent Study Plan." DLC. PVUSD. Sunrise Middle School, Scottsdale. 2013. Lecture.
Determining g on an Incline. Web.
Lee, Kyong. "Belly Button Glider Paper Airplane."2007. Web. 18 Nov. 2013.