500
A model rollercoaster type track was set up. Five marbles of different sizes were rolled down the track, one at a time. The time to reach the end of the track was measured for each marble. Identify the INDEPEDENT, DEPENDENT and CONTROL VARIABLES.
Independent Variable: Different marble sizes.
Dependent Variable: The time each marble took to reach
the end of the track.
Control Variable: Same model rollercoaster type track.