Dynamics PBM: Final Post

My hypothesis was correct. The object on the bottom transfer the momentum unto the object on top. When the basketball was on top, the tennis ball could only transfer its small momentum which caused the basketball to bounce up only a little higher than when by itself. So, when the tennis ball is on top, the large momentum of the basketball is transferred to the tennis ball, which is more than what this mass should have, thus the ball bounces very high.

Dynamics PBM: Hypothesis

I think the reason the tennis ball goes up so much higher is because the basketball is larger and transfers its momentum to the smaller tennis ball which would normally not have that much momentum by itself.


My plan to test this theory is to drop the basketball on top of the tennis ball and see if the basketball will go as high as the tennis ball did when it was on top. I will see how high it goes and determine if the mass and weight affect the height of the bounce.

Free Falling

Free Falling

http://www.youtube.com/watch?v=Qw8OJJQ_hgk

 

 I chose this video because it's awesome. The man set many records, most of which have remained unbroken. This is the highest, and longest, free fall ever. In the video, you can see how high in the atmosphere Joe Kittinger is. This video is better than others because most are from planes or cliffs, but in this, Joe jumps from a balloon. He looks as if he jumped from space. It is also interesting that the fall back to Earth doesn't physically affect him (burning up) and the video did a good job at explaining why. If I were to make a video, I would film myself sky diving because I've always wanted to do that and I could truly experience free falling. I could then give a firsthand account.

Spaghetti Tower

Money Report:

• 25 cm of tape: $250

• 18 spaghetti sticks: $180

• 4 marshmallows: $40 

Total: $470


Our tower was 86 cm.

One thing I liked about our tower was the strong, supportive base. I did not like the flimsy top because it caused our tower to tilt. The biggest challenge we faced was the tower tilting. We overcame this by purchasing more tape and adding more sticks for support. If I could change it, I would make a stronger top.

I felt pretty good about this assignment because we were successful. At one point we wanted to give up when it was falling at 65 cm, but we added more support and built it to 86 cm. Our design is very similar to the other successful towers in the class. If I could add another material it would be a hot glue gun.

Tyler was the architect and I was the accountant. We helped each other with our jobs and we both built the spaghetti tower.