This worksheet introduces random errors, how to reduce them, and two timing practicals to practice reducing random errors. Works well in Physics Forces and Motion topic when measuring time to calculate speed. The apparatus required for the two practicals are: Measure time for an object to fall 1 m: class set of 1m rulers, objects to drop, timers, calculators Measure the time for a pendulum or swing to oscillate (swing back and forth once): a pendulum or swing, timers, calculators. Great short lesson activity and the interactive element keeps it interesting and relevant.