Any kind or size light. One light or many. Think about what will impress the judges. Think about how cleverly the light (s) is (are) turned off.
YES. But the final step, must also turn off a light.
Any steps that occur after the task has been completed do not count. However, you are free to have
steps after the task is completed, even though they do not count toward your total number of steps.
Yes. Max 1 per machine and human must be a registered team member. A person may start the machine.
A person may be in the machine. If they touch anything in order to effect a transfer of energy, that will be scored as an intervention and lower the scoring for the machine.
Repeatability is how consistently a machine runs across multiple runs. A machine that works perfectly every time is ideal, but a machine that fails in the same place each time it runs is much easier to debug than a machine that fails in different places every time.
Yes, as long as they are not hazardous. For example, fog is allowed but steam that is hot enough to burn someone is not allowed.
Any physical touching or action to continue the operation of the machine after the machine begins a Contest run. Multiple touches/human interventions on the same step in the same Contest run count as a single touch.
Example: Your machine stops because one step does not trigger another. A team member interacts with the machine through a physical touch or other device to trigger any steps that follow.
A step in the machine is a transfer of energy from one action to another action. Identical transfers of energy in succession should be counted as 1 step.
Example: A sequence of dominos hitting each other should be counted as 1 step. Counting 100 dominoes as 100 steps is repetitive and not in the spirit of Rube Goldberg.
No — only one linear sequence of steps can be counted. Branching steps are not advised as they make machines hard to follow.
No. All entries must be new machines built for entry into the current Contest.
Yes, but their use must fit within the definition of a step. Steps that use controllers should be clearly stated in the written step list and include detailed information on how the transfer of energy is accomplished. Using controllers as a fail-safe is illegal and will result in disqualification.
Example: A ball falls onto a switch connected to a controller that turns on a motor.
NO: If the ball misses the switch but the controller still starts the motor, the controller is not transferring energy from one action to another action. It is acting as a fail-safe instead of a step and is illegal.
YES: If the ball hits the switch and the controller starts the motor, the controller is transferring energy from one action to another action and is consistent with the definition of a step.
Two auxiliary umbilicals per machine. This can be air, electrical, water, etc. Once they get into the boundary of the machine, it’s part of the machine and thus able to be distributed as needed.
It can be a different person. We don’t specify a limit, so it can be the whole team (and often is!)
You may, but we suggest you only use one slinky in the coolest way possible. That’s what you’ll be judged on.