• One way to measure distance is the run the car over a set distance.  Measuring time is a problem if you don't have a set distance, and acceleration calculations become impossible.

• Another way to calculate distance is to count the number of wheel rotations. Data cars 1 to 5 are using this method by measuring the number of slots, 20, that pass in a measured time.
• We could also measure the distance travelled by using an ultrasonic sensor.

And of course we could use a GPS detection .. as real cars do .. but we are inside .. and the fumes are dangerous!

• Each time the slot in the wheel passes the infrared sensor, it triggers a count.  Of course this similar to a trundle wheel held in many Maths classrooms.
• We will use the MIT Appinventor and the Arduino programming system to collect and display this data as a line graph.