RoboBuilder RQ PLUS 110, Руководство пользователя

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Friction force interrupts wheel's
movement. A ball has only little
friction force because it only touches
the floor slightly.
Right. Let's build a wheel, and play
a race game with the car robots.
Roll over and over~
Oh! The round wheel rolls
so well!
It's a toy car!
Triangle wheel, rectangular wheel...?
I wondered why car wheels
are round.
So, I experimented.
Huh! Triangular and rectangular
wheels cannot roll well...
Why is that?
The reason is so simple. Balls for baseball,
pingpong, and soccer are round.
Ball is round so it can roll
down the stairs.
Friction force?
Hoop and hula hoop roll so
well because they are round.
A ball only touches the floor lightly,
while a triangle and a rectangle touch
the floor with its wide side. So, the
friction force of a ball is just so little.
Since round ball has no sharp corners,
it can roll well.
5. Rolling Bot
Wheels are round.