Egglander or Egg Failure?

Today we were given a new project which would begin on wednesday; it is a gliding egg lander. Let's start by defining aerodynamics. It is the study of forces and the resulting motion of objects through the air. Now what does this have to do with eggs? Well as I mentioned, the egg does have to somewhat fly and to be successful in doing so, we have to know some information about aerodynamics: the study of air and its motion. For this project we will be given 25 straws, one sheet of newspaper, and a limited amount of tape. Learning that was all we had to work with, my group and I got really depressed. However, as Mr.Chung always says: never get freaked out by problems; just slowly and intelligently work it out (changed into my own words of course haha)... To do well on this project, the best thing would be to determine what kind of shape we should use to protect the egg. Obviously the first thing that came into my mind is the structure of a hang glider. Therefore to make our egg glide well enough, making wings for it would be a good idea and making a cushion is good for a safe landing. More brainstorming will be needed evidently but hopefully we can make a good egglander :)

A design I liked made by well some kids in college :P

A design of a hang glider

Word Problems pg 72

answers to word problems from friday on pg 72 :)

If At First You Don't Succeed, Try, Try Again

Today was basically the first day we started kinematics or in other words the motion unit. Mr.Chung had divided us in 7 groups and I was chosen as the leader. My job was to setup the equipment and explain to my group members what we were suppose to do and how. They got the hang of it pretty fast! The objective of the activity was to match our walking patterns to the pattern of the distance-time graphs or velocity-time graphs using a motion detector.

The result for graph B

  A. Stand at 1m away from the origin and stay at rest for 1s
  B. Jog 1.5 m [E] away from the origin in 2s at a constant speed
  C. Stand 2.5 m away from the origin for 3s
  D. Jog 0.75 m [W] toward the origin in 1.5s at a constant speed
  E. Stand at 1.75 m away from the origin and stay at rest for 2.5 s

The result for graph C

A. Start at a distance of 3 m away from the origin and jogs 1.5 m [W] toward the origin in 3s at a constant speed
B. Stand 1.5 m away from the origin and stay at rest for 1s
C. Jog 1 m [W] toward the origin in 1s
D. Stand 0.5 m away from the origin and stay at rest for 2s
E. Jog 2.5 m [E] away from the origin in 3s 

The result for graph D

A. Stay at a velocity of 0 (rest) for 2s
B. Speed is increased to 0.5 m/s [E] during 0.1 s
C. Speed of 0.5 m/s [E] is maintained for 2.9 s
D. Object quickly speeds up in 0.1 s at 0.5 m/s [W]
E. Stay at a velocity of 0 (rest) for 1.9 s
F. Speed is increased to 0.5 m/s [W] during 0.1 s
G. Speed of 0.5 m/s [W] is maintained for 2.9 s

The result for Graph E

A. Increase to a speed of 0.5 m/s [E] going away from the origin for 4s
B. Maintain speed of 0.5 m/s [E] for 2s
C. Speed is at 0 m/s [W] during the 0.1 s
D. Maintain a speed of 0.4 m/s [E] for 3.9 s
E. Speed up for 0.1 s at a speed of 0.4 m/s [E]
F. Stay at a velocity of 0 (rest) for 0.9 s

The result for Graph F

A. Stand about 0.8 m [E] away from the origin and jog 1m away from the origin for 3.5 s
B. Stand 1.8 m [E] away from the origin and stay at rest for 3 s
C. Jog 1.5 m [E] away from the origin in 3.5 s

Some things to know:

D-T Graphs (B,C, F)
-If the slope is inclining, walk away from the origin
-If there is no change in the line (slope of 0), stay still
-If the slope is declining, walk toward the origin
-The speed at which you have to walk depends on the time you have to walk it in

V-T Graphs (D, E)
-If there is no change in the line (slope of 0), the speed is constant
-If the velocity is at 0, there is no movement
-If the line inclines or declines, there is an indication that the speed is changing

Reading D-T or V-T graphs can be quite confusing. Therefore, you should carefully analyze the graphs.