3. Testing and Modification

3.1 Trial Test and Design Modification


Run Number
Run 1
Rerun 1
Rerun 2 
Total time of Run
5.3s
2.1s
7.5s
Total distance of Run
2.2m
2,5m
9m
Time for lever to fully release
1.0s 
0.7s
1.2s
Distance car travels while lever is releasing
1.5m
0.5m
1.5m
Observations – did car travel smoothly, 
straight, always forward, etc?
Car travelled towards the left
Car travelled towards right
Car travelled towards the right
Did lever / string operate smoothly?
No
No
Yes
Filename of video recorded is:  



Area for improvement (1 only) 



Fragile Base
Distance travelled was too short
The egg should be held
Possible reason (1 only) 




The base (Cardboard) too soft and not durable
Length of the string was too short
No space 
Modification made (1 only)
Removal of cardboard base
Addition of a wooden rod to increase the length of the string
Addition of egg carton to hold the egg in place






MODIFICATION(S)

DRAFT:



FINAL:






3.2 Test Data


1.All relevant measurements of your car (after modification).

Mass of your car                                                        
185g
Mass of each wheel (or one of they are all the same) 
15g
Wheel diameter                                                          
10cm
Axle diameter                                                             
0.8cm
Length of string (power stroke)                                  
27cm
Approx. number of wraps of string                             
12
Length of lever extension                                            
17cm
Overall length                                                              
23cm
Overall width                                                               
29cm
Overall height                                                              
10cm

2. Data tables showing the results of all 3 trials.

Run Number Run 1 Rerun 1 Rerun 2 
Total time of Run 7.5s 7.3s 8.1s
Total distance of Run 9m 10m 9m
Time for lever to fully release 1.2s  1.1s 1.8s
Distance car travels while lever is releasing 1.5m 1.5m 1.5m
Observations – did car travel smoothly, 
straight, always forward, etc?
Car travelled towards the right Car travelled towards the right Car travelled towards the right
Did lever / string operate smoothly? Yes Yes Yes
Filename of video recorded is:   http://www.youtube.com/watch?v=hMjOJDHhSH8&feature=youtu.be

(Physics PT Test Run 1)
http://www.youtube.com/watch?v=oJmbayg0Yx0



(Physics PT Test Run 2)
http://www.youtube.com/watch?v=00OuiUh0Ezc&feature=youtu.be

(Physics PT Test Run 3) 



3.3 Video Clips 





1st Run
video


1st Rerun
video


2nd Rerun
video



1. http://www.youtube.com/watch?v=hMjOJDHhSH8&feature=youtu.be

2. http://www.youtube.com/watch?v=oJmbayg0Yx0

3. http://www.youtube.com/watch?v=00OuiUh0Ezc&feature=youtu.be



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