MTC Designing Lab

Intro
  This lab is to produce a fancy car that works with the engine(mouse trap) and some trashes that can be found in house. Ridiculously, our car must be in our own design and go farther than 5 m in order to get an A. Therefore, i had to pick an special design that no one uses it but i had to take a risk that it wouldn't go further

Hypothesis
   As the mouse trap on the top pulls the string, it rolls the wheel about 12 times; which the car should go a little bit more than 5m.

Working as a Group
  Since I wasn't live close to Christy, I had to call guardian to go all the way to her house. on Saturday and Monday, I went to her house and worked on the car together. Even though i had to do all dangerous jobs, such as making an holes on the can, or cutting the can, Christy helped me on making wheels and setting mousetrap.

Design
  Our design was the best of all class works since the monster can, duct tape, and the huge wheels made perfect harmony and no one's car looked like my car.

Relevance
  since ours in light and has huge head, air resistance was huge. Moreover, the cap was off when we did the trials so the air resistance would be worse.

Adaptation
  Well, I don't think i have used any physics in this lab. More likely my mouse trap car moved with the math: the length or the wheels' perimeter will be bigger than 5 meters. The only physics that I could use was the force of friction since I minimized the friction between the car and the ground by making the car light and the air friction by tilting it about 30 degrees.

Conclusion
This time, I focused too much on the design of the Car, so if i have another chance to make the MTC, I would simplify my design and make it to go way farther than my previous one.

Data

	1st run	2nd run
Displacement (exhausted trap)	14.3 m	13.6 m
Time (exhausted trap)	13.7 s	13.5 s
Displacement (total)	15.1 m	14.5 m
Time (total)	14.7 s	14.4 s
Mass of car in kg	.4 kg	.4 kg
Calculated max velocity	2.09 m/s	2.01 m/s
Calculated Average acceleration	.15 m/s^2	.15m/s^2
Calculated Average deceleration	-2.72 m/s^2	-2.26 m/s^2
Calculated Force and Coefficient of Friction	1.08, .275	.904, .230
Calculate the spring’s applied force	1.08	.904
Calculate Work done	16.3	13.1
Calculate the power generated	1.11	1.12

Those two are previous model

Group Picture

Picture of me with the latest model of the car

(where is my lab partner lol)

Design a lab Trajectory

Hyun
Kim, Christy, Rin
Physics, Blk 2
Mr. Elwer

Introduction : As human trow a ball, brain automatically calculate the angle and throw in a hyperbolic path so that the ball goes to exact spot. Hyperbolic path of the projectile provides lots of information: launching angle, initial velocity, maximum height of projectile, total displacement when the object first hit the ground. Lots of other information can be derived from these information. Students should be using trigonometric equations and bunch of physics equations to calculate all the measurements. The purpose of this lab was to get the initial velocity of projectile and the angle that is has been thrown with when we were given the length, the angle of the projectile form a observer who is 7m apart from the projectile. From this lab, we would be able to get the angle of the projectile when it was thrown, and initial velocity that ball possesses.

Materials : To compete this lab, we need: Mr. Elwer(as a pitcher), couple cones, tape measure, couple student with angle gun, and balls.

Experimental Design : On this lab angles that students measure and the total displacement of projectile will be crucial because as those independent variables change, dependent variables such as angle of projectile and initial velocity will change. To do this accurately Mr. Elwer and angle observers shouldn't be moving, and someone should measure the distance pretty accurately by putting cones exactly where projectile hit the floor.

Procedures :
     1. Go outside to find enough space
     2. Place Mr. Elwer on a position, angle observers, and a student who will record the displacement
     3. Throw the ball, measure the displacement, and angle of maximum height of the ball.       *make sure thrower do the overhand mother and angles are between 20' to 70'.
     4. Repeat 3 couple times so that we can get the accurate data.


Date Table :

Trial #	Angle (')	Distance (m)
1	32	15.9 m
2	38	14.5 m

1st Trial:

Minimum distance between observer and the path of the projectile = 7m

Height of Thrower and Observer = 2m

Angle of angle gun = 32

Displacement = 15.9

Acceleration from gravity(a) = -9.81

Velocity of Projectile in y direction when it hits the maximum point (Vyf) = 0

Total Height of the Projectile when it hits the maximum point = 2+7*tan(32)

h = h_i + v_it + at²/2

7tan32=(9.81)t^2/2

t=.944331=.94s

Vyf=Vyi+at, 0=Vi+(-9.81)*t

Vyi=9.26388=9.3m/s

Vx=d/t, Vx=15.9/(.944331*2)=8.41866=8.4m/s

use pitagorian theorem Vi=sqroot(Vx^2+Vyi^2)=12.5177=13m/s

angle=arctan(9.3/8.4)=48'

2nd Trial

Total Height of the Projectile when it hits the maximum point = 2+7tan(38)

7tan38=(9.81)t^2/2

t=1.05593=1.1s

0=Vi+(-9.81)*t

Vyi=10.3587=10.m/s

Vx=d/t, Vx=14.5/(1.05593*2)=6.866=6.9m/s

Vi=sqroot(Vx^2+Vyi^2)=12.4275=12m/s

angle=arctan(10/6.9)=56'

Graphs :

Time vs Position

Conclusion : Mr Elwer was throwing the balls with about 50 degrees and with about 12m/s. this tells that we could get the initial velocity of projector and angle from height of the object's maximum height. However, this lab can show me huge error because, as people use the angle gun, there can be huge error. to improve this problem, we can buy a new, fancy, and expensive machine to measure the angle, otherwise, we have to go over the procedure over dozens of times.