4. Discussion

4.1 Analysis of results
GZ would always be at the 1 mark as gravity was present. From the Figure 1, we can tell that the speed increased over time. This was caused by the rider paddling more. What was in the motion that helped to move the caster board faster when paddled?
In Figure 4 and 5(the front and back board respectively),the combination of GZ (upwards and downwards motion) and GY (left and right motion) cause the motion GX (forward motion) to move.  For GY, you can tell the number of times that the rider paddled. For every hump that goes up and back down, the rider makes a full left right rotation. Near the 8 second mark, the rider had a decrease of speed so more pressure was applied into moving the caster board so there was a greater increase. When there was an increase in speed, the humps became closer and smaller as the amount of paddling that is needed increases to ensure the caster board accelerates. In the video, the caster board increased speed at the final moments at the last parts.

4.2 Key findings

1)With the combination of GZ and GY,we are able to make the board move forward,which is the GX. As not much force was applied,GX stayed low.
2)The amount of times that the person paddled can be calculated by the number of humps present at GY.
3)The more force put into paddling the board/moving GY,the faster the board will move.
4)GZ is not affecting much of the acceleration but still part if it.The acceleration is more dependant on GY.
5)The more the amount of paddle within a second,the faster the board would move.
4.3 Explanation of key findings
The GY was the motion that was mostly involved in the motion of the caster board.As more force was being applied for GY,the faster the caster board moves.GZ is used for the height increase of the wave board and when the wheels has a height increase,the weight of the board would push the wheel back down,causing it to move a little.


4.4 Evaluation of Hypothesis
Our hypothesis that the linear motion of the caster board is caused by the gravitational potential energy obtained when the caster board increases in height factor was wrong because this factor is very minimal. The actual propelling factor is how hard the rider pushes the footboards up and down.The acceleration or deceleration of the caster board is affected by the angle and angular velocity of the rolling action as when the acceleration of GZ and GY increased,the speed increased as well.When the two decreased,the board decreased in speed.


4.5 Areas for improvement

  1. We could have chosen a place with no one but us so there would be minimal distractions.
  2. We also had the problem with the small but important time difference between the pressing of the buttons to start the data recording in the data loggers and the actual starting of the person starting to ride the caster board. When calculating the speed using tracking software, the exact time of the start of the experiment is not known so the speed by time graph plotted will not completely match the acceleration graph, causing some inaccuracy. If there was a way to record the video and press the buttons at the same time, there would be less room for error.
  3. We were unable to video-record the full distance traveled by the caster board in those 10 seconds of data recording due to the confines of the venue used to experiment. We could have used a bigger place.

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