A rubber ball is allowed to set off the machine tasks. Teams will likely come up with a variety of allowed objects that could be used to set off machines and tasks.
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Yes, a matchbox car may be used. Great that you mentioned catalyst! You could count the car as a ‘wheel and axle’ if its indeed part of a series of actions which include an attempted task.
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Dropping an object is an allowed trigger, but judges are expecting teams to attempt to use a trigger that doesn’t allow for potential additional energy assistance from the team member that ‘triggers’ the device. What this means is that if a judge observes a trigger in which the team member provides additional ‘human energy’ to the trigger, they could be disqualified. So no extra propulsion assistance is a big thing to avoid. The safest bet is to just use a simple trigger (like a stick, string, clip, etc.) that a team member easily removes for their ‘trigger’ and which would make it difficult for a team member to provide extra energy.
*Also remember that any trigger needs to be within the 1 meter size restriction for the device.
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