PT 2.4 Testing of Car


Distance travelled: 17 feet 10 inches
Time taken: 7 seconds

Mass of mousetrap car
324.2 grams
Mass of each wheel (or one of they are all the same)
14.40 g
Wheel diameter
CD (back wheels) - 12.0 cm
CD (Front wheel) - 12.0 cm
Axle diameter
0.4 cm
Length of string (from end of lever to axle)
31.5 cm
Length of lever extension
31.0 cm
Overall length
37.0 cm
Overall width
17.0 cm
Overall height
12.7 cm

2.Final assessment data table

Run Number
Trial 1
Trial 2
Trial 3
Total time of Run / s
5
7
7
Total distance of Run / m
3.50
4.60
5.44
Total score
76.0
76.4
79.8


Post-test discussion
1. Average velocity was about 0.78 m/s
2. The third design worked the best as it is the most stable due to the rubber coating on the pivots which provides friction and with friction, the components are held in place. The chassis was also properly secured
3. We would make sure the wheels are even more stable by adding more glue so that when the car moves, the wheels are secured and the car moves further
4.  The thread that was tied around the mousetrap was also pulled tighter in order to make the wheels travel further

Connection to Concepts 

The first law of motion is that every object in a state of motion stays in that state of motion unless an external force acts upon it. This relates to our project because the mousetrap car stays still until the mousetrap is snapped and pulls the string which, in turn, turns the back wheels of the mousetrap car. The string turning the wheels is the outside force that accelerates the car.
The second law of motion is that F=ma (force = mass * acceleration). The mass of the mousetrap car times the acceleration from the string turning the wheels becomes how much force the car has.

The third law of motion is that for every action, there is an equal and opposing action. For the mousetrap car, the opposing force that is going to stop it from going farther is going to be friction.


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