... anyone or anything. Dangers that may be encountered during this investigation include the fast (or slow!) moving trolley, possibly causing damage to interfering obstacles or people. To ensure that this does not happen I will clear the area before carrying out the experiment. I will ensure that people participating in the experiment are standing and not sitting and that a First aid kit is available in case of injury or emergency. Apparatus I will be using the following equipment in my investigation: * Trolley (with spring attached) * Ruler * Cardboard * Light Gate (connected to a computer) * Smooth surface * Calculator Method The trolley will be adjacent to a wall, allowing the spring to compress against it. The light gate, position with a clamp, will be fixed directly above the trolley slightly away from the wall. There will be an upright strip of cardboard attached to the near front of the trolley which will pass through the light gate ...

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