Goal and Object

The main goal in this experiment is measuring the distance and speed of the wheel while a lego car is traveling in a certain amount of time. The object that our team used is an lego car which can connect to computer to calculate its distance and speed through a program.

Experiment Process

• First, we connected the car to computer through two USB cables.
• Second, we opened the VI to record the wheel rotation, distance, and speed.
• Next, we used a ruler to measure the radius of wheel.
• Then, we found the distance by calculating the circumference of the wheel. (d = circumference)
• After that, we entered the information into the VI and began to record the speed
• Also, we had to record in two way. One by ruler, and the other is on computer.
• Third, we let the can run in a certain amount of time and distance that we already set up on the computer.
• Fourth, we used ruler to measure the distance that the car had passed.
• Finally, we wrote down the number that we had record by ruler and the one on computer that had been already calculated.
• Additionally, we had to do the experiment three tests with the different number of time and power. Also, in each tests, we had to do three times so it would be nine times totally

Calculation

• First, we use the equation of circumference to calculate the distance because distance = circumference (d=2pi*r)
• Then, we converted from centimeter to meter
• Finally, after each test, we would calculate the percentage of error between computer and ruler measuring result.

% error = [|dm-dc|/((dm+dc)/2)]*100

Result

Conclusion

Even though the percentage of errors are still big in our opinion, we felt satisfied with what we did and experienced through this experiment.