2.4 & 2.5 : Construction of prototypes & Testing and Modifications

Our final car looks like this :

Top View of our car
Angled back view 
Side View
Angled Side View 

The dimensions of our car are as follows :

Mass of Mousetrap Car : 180g
Mass of Wheel : 12g
Wheel Diameter : 10cm
Length of String : 20cm
Length of Lever extension : 10cm
Overall Length : 30cm
Overal1 all Width : 15cm
Overall height : 15cm

Our project was done over a week

26/3 : Day 1 of construction 

We proceeded to a team member's house to do our project.
We built the Axis , wheels and basic parts were constructed today.

Our original wheel 
Our original body


We noticed various things :

1) We noticed that the wheels do not travel well because there are tiny flaps sticking out due to the nature of the material. These little "flaps" increase drag and decreased the distanced travelled. 

2) The blue cardboard was not strong enough to hold the weight of the mousetrap. 


28/3 Day 2 of construction 

We stayed back after school to continue with construction 

We replaced the body of the car with a stronger type of cardboard. As shown below.
 The body was attached to our final car  



We also tested our car for the first time with old wheels ( not CDs) shown below . 

The car travelled very little. 

We decided to make the following modifications : 

1) Replace cardboard wheels with CD

29/3 Day 3 of construction 

We successfully managed to replace the wheels with CDs. To add friction , we added tape. 

30/3 Group Internal Testing 

Today , we did final modifications and tested our car to see if it works. 




1/4 Testing Day

As required by our task , we were suppose to do 3 trails runs and make any modifications in order to gain the best distance.

Trail 1 
Total Time : 17seconds
Total Distance : 3.21m

Observation 1 : Was the car in steady and stable motion throughout?
Ans : Yes

Observation 2 : Was the car moving in a straight line mostly?
Ans : Yes

Observation 3: Did the lever and string operate smoothly as well as expected?
Ans : No

State 1 area for reflection.
Ans : We could wind  the string properly so that is does not overlap and affect the speed/ deployment of the system.

We should also shorten the rope length as more tension and potential energy will be present to be converted into kinetic energy.

Modification : Shorten Rope

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Trail 2 
Total Time : 4seconds
Total Distance : 3.33 m

Observation 1 : Was the car in steady and stable motion throughout?
Ans : Yes

Observation 2 : Was the car moving in a straight line mostly?
Ans : Yes

Observation 3: Did the lever and string operate smoothly as well as expected?
Ans : Yes

State 1 area for reflection.
Ans : We realise that the car can move faster if there were lesser wrinkles caused by the tape which were on the CDs. The CDs were not smooth and hindered the car from covering more distance as the wrinkles will cause unnecessary friction.

Modification : Re-tape/Smoothen the wheels.

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Trail 3 
Total Time : 4seconds
Total Distance : 3.45 m

Observation 1 : Was the car in steady and stable motion throughout?
Ans : Yes

Observation 2 : Was the car moving in a straight line mostly?
Ans : Yes

Observation 3: Did the lever and string operate smoothly as well as expected?
Ans : Yes

State 1 area for reflection.
Ans : We realise the car when further and faster this time. In addition the car was more stable and did better than expected.

Modification : Last try ; no modification allowed anymore.

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Video of best trail :

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