1P2

=PERIOD ONE PROSECUTION = =(FOR CASE NUMBER TWO) =

=__//**LABS:**//__=

__REACTION TIME LAB__


 * Trial || distance (m) || time (s) || prt ||
 * 1 || .197 || .201 || 2.01 ||
 * 2 || .185 || .194 || 1.94 ||
 * 3 || .175 || .189 || 1.89 ||
 * 4 || .182 || .192 || 1.92 ||
 * 5 || .178 || .178 || 1.78 ||

Benjamin Lyaunzon - My average PRT, over five trials, was 1.908 seconds. Given the average PRT of 1.5, mine is slightly above that. This would probably infer that I would break slightly late and most likely find myself in a nasty collision. However, it is interesting to not that I only got 5 hours of sleep the previous night, meaning that my perception and reaction time was most likely altered because of sleep deprivation. This shows how much environmental conditions and circumstances can effect the outcome of a collision.


 * trial || distance (m) || time (s) || PRT ||
 * 1 || .1 || .142857143 || 1.438571429 ||
 * 2 || .12 || .15649215 || 1.564921593 ||
 * 3 || .113 || .151859226 || 1.518592259 ||
 * 4 || .115 || .153197218 || 1.531972185 ||
 * 5 || .1 || .142857143 || 1.428571429 ||

Gabrielle Steinfeld - My average PRT, over five trials, was 1.49 seconds. I think this is about average.

Steve Reynolds- Compared to my group, I had the an above average reaction time since my average PRT was 1.38 seconds. I found my reaction time by taking the square root of two times my distance and divided by gravity. To find PRT, I multiplied my reaction time by ten.
 * Trial || Distance (m) || Reaction Time (s) || PRT (s) ||
 * 1 || 0.08 || 0.127 || 1.27 ||
 * 2 || 0.10 || 0.143 || 1.43 ||
 * 3 || 0.11 || 0.150 || 1.50 ||
 * 4 || 0.08 || 0.127 || 1.27 ||
 * 5 || 0.10 || 0.143 || 1.43 ||
 * Average || 0.09 || 0.138 || 1.38 ||

Sarah Cancelarich- My reaction time was 1.46. Not a big deal but it's better than Steve's you knowwwww. Oh and I proved Josh Waldman wrong today. I'm on a rollllll.

__CRUSH ENERGY LAB__

Mass of marble= 66.8 g= .0668 kg

We use this equation to find the Crush Energy of each section and add them together **CE = [A2/(2** **×** **B)](L) + A** **×** **C** **×** **L + (B** **×** **C2/2)(L)**

=**EVIDENCE AND CALCULATIONS** = =**PERTAINING TO TRIAL** =

= = __**EVIDENCE:**__

=B= A K

DE FG HI C

J Mass of Wood Block / Tire + Weight = 5.5kg
 * Trials || Ff Means ||
 * 1 || 37.4 ||
 * 2 || 38.5 ||
 * 3 || 38.1 ||
 * 4 || 36.7 ||
 * 5 || 37.3 ||
 * Overall Avg. || 37.6 ||

__Drag Factor Calculations__ Ergo, drag factor = 0.698 Rolling coefficient of friction=.0125

__Skid Marks__ MV1 = 0.75in = 15ft = 4.6m MV2 = 0.625in = 12.5ft = 3.8m

__Distance Traveled Post Impact__ MV1 = 1.625 = 32.5ft = 9.906m MV2 = 1.25in = 25ft = 7.62m

__Angles__ MV1=70 degrees West of North MV2=72 degrees South of East

=**Given Evidence**= 1. Road surface appears dry with traces of sand and/or dirt 2. Temperature was 58 degrees Fahrenheit, and it was sunny with a few clouds in the sky
 * Observations of Surroundings**

MV1: 1. 2002 Subaru Forester - gold 2. When at rest it is perpendicular to MV2 with right front corner of MV1 pushed into drivers door of MV2 3. Front windshield cracked 4. Right front passenger window shattered 5. Blue transfer paint visible on right quarter panel and both passenger side doors 6. Right front tire flat and its aluminum hub cracked 7. Tires appear to have normal wear
 * Observations of Cars**

MV2: 1. 2005 Ford Focus - blue 2. Driver side of MV2 came to rest perpendicular to MV1. 3. Driver's door crushed inwards 4. Drivers seat displaced towards the passenger side of the car 5. Driver died at the scene - appears to be from blunt trauma due at the time of impact 6. Contents of the Thule Cargo box was strewn on lawn area 7. Tires appear to have normal wear

1. Reveals it was a high-speed impact 2. Gouge marks on the roadway
 * Observations after the Crash**

“I was going west on Woodcliff Ave. over the causeway of Woodcliff Lake. I was traveling below the speed limit – no more than 30 mph. I then made a right turn onto Mill Rd. All of a sudden this guy swerves in front of me and crashes into me. He was traveling south on Mill Rd. I didn’t realize what happened until the homeowner pulled me from the car”.
 * Statement of MV1 Operator at Scene of the Accident**

=__Applying the Crush Lab (finding out speed DURING crash)__= see attached document:



=__//Skid Mark Component (PRIOR to crash/while car is breaking)//__= m=1869 kg µ=.69 g=9.8 m/s angle=5 degree slope (ignore angle because it's so small)
 * MV1** - 1.625 = 32.5ft = 9.906m


 * MV1:** Wnc=125193.79

mass=1024 µ=.69 g=9.8 m/s angle=0 degrees
 * MV2** - 0.875in = 17.5ft = 5.33m


 * MV2:** Wnc=36906.46 N

=__Using Displacement Distance to find POST impact velocity (we're ignoring this because it is almost impossible to agree on a way to do this and the speeds are small. However, this is what we came up with:__= rolling friction=.0125 theta=70 degrees g=9.8 m/s displacement (d)=9.906 meters
 * MV1:**
 * vi=1.51 m/s=3.38 mph**

rolling friction=.0125 theta=74 degrees g=9.8 m/s displacement (d)=7.62 meters
 * MV2:**
 * vi=1.34 m/s=2.997 mph**

=__//Initial velocity://__=

MV1 INITIAL VELOCITY: 13.5 m/s or 30.2 mph MV2 INITIAL VELOCITY: 12.07 m/s or 27 mph


 * GROUP CONTRACT

Members

Case 2 - Prosecution

Project Car Accident Reconstruction

Roles (who and what) Attorney: Steve Reynolds Police Witness: Gabby Steinfeld Expert Witness: Ben Lyaunzon Technical Assistant: Sarah Cancelarich

Group Constitution

Forward: This contract is a binding legal document and governs the group until the assigned project deadline. If the group separates, or a member is fired, the basic contract laws remain intact for both parties. However, being fired may cause work responsibilities to shift.

Article I: Absence Policy a. If a group member will be absent on a day in which group work is due, they must email the work to the other three members by period 1. b. If a group member will be absent on a group workday, he/she must find out what they missed and get it done by appropriate due date. c. If a group member knows he/she will be absent, they must notify the group beforehand. d. If a group member is absent and notifies the group as agreed above, the other group members must check their emails and notify the absent group member about work they missed.

Article II: Work Policy a. Each group member will do their work completely and ON TIME. b. Any member that is mentally or physically disabled and can prove that they cannot complete the work assigned to them they must complete it by the next day at the latest (unless that next day is a Saturday or if they suffer a mental breakdown). c. If a group member commits plagiarism/cheats they have to redo the work and suffer the consequences.

Article III: Leadership a. How will group leader be selected? 1. This is a democracy; we vote. b. By being elected leader, the person must perform the following duties: 1. Keep everyone under control 2. Make sure they do their work and the group members do their work 3. Make sure we don’t fail. c. If a leader fulfills his or her duties, they will receive 1. An A (hopefully) 2. Kudos d. If a leader does not fulfill his/her duties 1. They will be impeached

Article IV: Work Ethics a. If a group member does not complete work they were assigned, the punishment for the infringement will be scolding and intimidation techniques. b. At the end of the project, how will points for contributions (hard-workers) or lack thereof, be determined? 1. For completing the work: 10 points 2. For completing the work late: 8 points 3. For completing the work late and incompletely: 3 points 4. For completing extra work: +2 points 5. For correcting others work: +2 points

Article V: Member Dismissal a. Can a member be dismissed? If so, under what circumstances? What happens to their work/contribution? Yes. If they drop out of school. Otherwise, no. Their work will be distributed amongst the group members.

b. What if a group member leaves under their own will? What happens to their work/contribution? This will not happen but if by any chance it does, their work will be distributed amongst the group members.

Article VI: Signature By signing this contract the following group members abide to the articles above. What if any member fails to abide by the articles of this contract? They will will be punished with bad mainstream music.

Project Leader The group has elected Gabby Steinfeld as the project leader under Article III.

Signature steve: 103 gabby: 777 ben: 888 sarah: 999**

LOG: -Found mu/drag force -Posted new data to wiki ||  || -Reworked page to make it a bit neater ||  ||
 * Day || Achieved || Absent ||
 * Thursday 4/22 || Made group contract || Steve ||
 * Friday 4/23 || Went over ELVA book ||  ||
 * Monday 4/26 || PRT lab ||  ||
 * Tuesday 4/267 || Assembly (nothing done) ||  ||
 * Wednesday 4/28 || Started Crush Lab || Sarah Cancelarich ||
 * Thursday 4/29 || -Finished crush lab and applied data to find energy to crush both cars
 * Friday 4/30 || Found change in velocity before crash, change in velocity during crash, and change in velocity after crash of both cars and added all the delta vs together to find overall velocity before crash for both cars. ||  ||
 * Monday 5/3 || -Fixed data that was wrong and reworked calculations. Made contract with defense group saying all posts have to be finalized on **Wednesday** the fifth
 * Tuesday 5/4 || Fixed crush lab on the wiki as it was changed. Fixed basically everything that was wrong. Horray! ||  ||

http://www.motortrend.com/cars/2002/subaru/forester/specifications/index.html [used to find wheelbase of Subaru Forester] http://www.internetautoguide.com/car-specifications/09-int/2002/subaru/forester/index.html [used to find mass of Subaru Forester] http://www.theautochannel.com/news/2004/09/30/240175.html [used to find wheelbase of Ford Focus]**
 * http://www.autobuyguide.com/2005/12-aut/ford/focus/specifications/index.html [used to find mass of Ford Focus]