Dynamics PBM Hypothesis Post

I believe the small tennis ball made a dramatic bounce on top of the larger ball because the surface was smaller than the bigger ball (basketball). Also it's momentum increased it's height because it bounced off the force of the basketball and the flat surface.

Dynamics PBM Final Post

Question 1: Why does letting a small ball drop on top of a larger ball make such a dramatic difference in bounce?

Objectives:
1. The Physics Standards that relate to this problem are:
d. 
Students know
that when one object exerts a force on a second object, the second object always exerts a force of equal magnitude and in the opposite direction (Newton's third law).

e.

Students know the relationship between the universal law of gravitation and the effect of gravity on an object at the surface of Earth.

f.

Students know applying a force to an object perpendicular to the direction of its motion causes the object to change direction but not speed (e.g., Earth's gravitational force causes a satellite in a circular orbit to change direction but not speed).

h. *

Students know Newton's laws are not exact but provide very good approximations unless an object is moving close to the speed of light or is small enough that quantum effects are important. 

Why does letting a small ball drop on top of a larger ball make such a dramatic difference in bounce?

When a small ball is dropped on a larger ball, the smaller ball bounces dramatically higher than as the ball being dropped normally. This is the case because when both balls are dropped, the momentum of the larger ball is transferred to the smaller ball hence the increase of height. In addition, the smaller ball bounced higher because the force point caused it to go the opposite direction with the same magnitude at contact, resulting in the fast impact. With the help of inertia the objects stayed at rest and after the demonstration, the balls slowly return to the state of rest. The amount of force placed on the balls depends on how much mass and weight is in them. A bigger ball with more mass will make the smaller ball bounce higher than a small ball of the same weight with different mass. The one with more mass will work better with height reach because with more mass, the more force the ball will act on it.

Lab: Get balls with different masses and weight and compare the distance of the ball that goes up

Free Falling

http://www.youtube.com/watch?v=uQITWbAaDx0

I chose this video because of the content and because the video kept me on the edge of my seat the whole time I watched it. The music was very suspenseful and I never knew what was going to happen next. It was better than others because it was very interesting how it was filmed and one wonders how long it took to make it and how much dedication it took the person to dive into a deep dark hole. I thought the person was going to be sucked in by something and never come out. If I were to make a video I would want to record myself bungee jumping with those cool HD video cameras and I would have dubstep playing in the background so I would feel like I am in one of those commercials.

Spaghetti Tower!

Group Analysis:
1 & 2.

3. 50 cms

4. What I dislike about my design is that it is a complicated structure and it takes most of our money to build. What I like is that it is unique and picturesque.

5. The biggest challenge my team mates and I faced were tryingt to balance all the spaghetti sticks together and distributing all the marshmallows evenly. We kind of overcame it by putting our heads together and thinking of the most convenient ways to balance and measure everything.

6. If I had the opportunity to re-design my tower, I would make it less complicated. I would make a simpler design that gets the job done.

Self Analysis:

1. I personally hated this prodject so much. I get frustrated easily and would want to burst everytime the design wouldn't stand. I wanted to give up the second we started. I started to like it when little by little, the piece would come together and it relieved my stress.

2. The structure of our tower is some-what similar to those around the room. What makes ours different is that it is more triangular shaped than those of others who is either square or rectangular shaped.

3. I fI could add another material I would add super glue. Super glue is an amazing adhesive and our group would have no problem with the sticks sticking!

4. My contribution to the group was not just one role. I did a little bit of all the roles. I helped do the math, get the materials, and helped construct the tower.