Does a motor with twice the load go twice as slow?
No, it is not a dumb question and no, the speed does not double or halve.

A rule of thumb for most types of motors is:


voltage is related to speed;
current is related to torque.


Voltage x current or speed x torque is power.

So with the same voltage and double the current, the speed will be almost the same and the torque will be about double.

c-: