Four cars made with the same elements yet go different distances.  The variable being changed is the height of the ramp.  The potential energy of a car moved to the top of the ramp is kinetic energy (and friction) as the car travels down the ramp.  The distance the car goes after the ramp is an indicator of the kinetic energy.

For each car the distance traveled was recorded for 4 trials and averaged.
This was done for five heights. Kid power and computer power was used for the averaging.
The higher the ramp is the father the cars go for the first changes but going much higher did not give a greater distance. There are more questions for some other time.

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