Each of these 3 devices can be used to show acceleration; they each have characteristics
that show better in different situations and used in some quantitative manner to compare
relative values of acceleration.
Electric lights add up quantiratively with acceleration
Colored liquid in plastic splashes to one side with inertia to indicate presence and
direction of acceleration.
Golf tees are spaced to indicate equal times as cart moves, spacing of tees indicates
presence, direction and approximate amount of acceleration.