The wires being crossed and so delivering the wrong power to the wrong motor.
The wires being faulty
The motors being on back the front
The wires being attached differently at the motor and output port.
A faulty motor.
The tyre slipping on the wheel rim
The gears slipping
The motor coming loose from its mount, allowing the gears to force apart.
The gears missing teeth.
The batteries running out of power.
The wheels being the wrong size
About to turn.
It has full power.
The batteries are almost empty
That you have put the wrong batteries in the tankbot
It is the command center of the robot, because it controls its actions through the programs within it and supplies power to run them.
The RCX can hold 5 different programs. However, as part of its firmware it also comes with three preset programs.
The RCX has three input ports ABC where information can be gathered and three output ports 123 supplying power to motors.
The RCX has three input ports 123 where information can be gathered and three output ports ABC supplying power to motors
Here's an interesting quiz for you.