Make the program

Start NXT educational software, open a new program, and make the program using only one [motor block].
Then set the port [B] of the motor block, set to the duration [5 seconds].

Then download it to NXT and press RUN, the car will move forward for 5 seconds.
Here, I want you to remember this car’s running speed. In addition, out of your hand in front of the running car, remember the "power" to stop the car pressed by your hand. Make the following changes to the program. It has been changed the power from [75] to [25], download & RUN.

See that? It became quite slow speed.
In the same way as before, try to stop the car by hand. you know that became much weaker power.
In the setting of the program [motor block], it is possible to control the speed and power of the car in this way.
If you increase the number of power, speed is also power-up also. You can also power down speed is also reduced.
But what do you do with "Speed is slowly, want plenty of power"? For example, when you want to climb a steep way slowly, when you run a bad road with various obstacles have been scattered.

What do you do when there is not enough power even to maximize the [motor block]?
Alternatively, even when there is not enough speed to maximize the [motor block] what would you do?
I use the "gear" at time like this. Gear. It is very interesting and so deep to learn. First of all, the power of the motor block back from [25] to [75], and change the direction from the [↑] to [↓], after the modification, download it to NXT. Yet, wait to press the RUN.