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During the lab period everyone constructed a 'bracket pendulum' and estimated the time between 'strikes' of the pendulum on the bracket.  The time was estimated by setting a count of 8 using the pendulum, then continuing at this rate for three additional counts of 8, while watching the second hand of a clock.  We also allowed the pendulum to swing freely and determined the number of cycles in 30 seconds.

Everyone then used the pendulum to time the ball down the track for 1-, 2- and 3-domino systems, then timed the ball as it rolled down the track and fell to the floor.