I saw this toy skateboard and hand held battery powered fan in my local bargain store and thought together they might make a simple fan driven car. I quickly established the small wheels were a problem.
It is to do with leverage. The fan is trying to push the car forward using the wheel as a lever to turn the axle against the friction of the bearing. The larger the lever the less effort is required, (up to the point where the weight of the wheel requires more effort than the gain from the extra leverage).
It would make no difference if the car was sitting on a polished mirror, it is not the friction or roughness of the ground that is the problem, it is the friction of the bearing surface on the axle.
Components
-
1 toy skateboard
1 hand held battery powered fan
2 drinking straws
2 barbecue skewers
4 CDs
8 plastic bottle tops
Tools
-
Hot Glue Gun
Here are some related playlists
Help Files
[ Ссылка ]
Fan Cars
[ Ссылка ]
Rubber Band Powered Cars - Looking at the MATHS [ Ссылка ]
Big wheels or small wheel [ Ссылка ]
My Channels
GrandadIsAnOldMan [ Ссылка ]
GrandadsOtherChannel [ Ссылка ]
Put a rubber band on it [ Ссылка ]
Number4 [ Ссылка ]
You can help keep my channel running with coffee and cakes at Patreon [ Ссылка ]
If you don't like Patreon you use Kofi instead [ Ссылка ]
Merchandise on RedBubble [ Ссылка ]
Merchandise on Cotton Cart [ Ссылка ]
Merchandise on Teespring [ Ссылка ]
Twitter [ Ссылка ]
FaceBook [ Ссылка ]
Pinterest [ Ссылка ]
Instagram [ Ссылка ]
Thingiverse [ Ссылка ]
Tinkercad [ Ссылка ]
Oldest videos [ Ссылка ]
Most Popular [ Ссылка ]
Newest videos [ Ссылка ]
Playlists [ Ссылка ]
I have thousands of videos on YouTube, to find one try my search guides [ Ссылка ] or [ Ссылка ]
I am happy for you to show my content as part of your own projects or in public settings as long as you clearly credit GrandadIsAnOldMan. Do not copy my video content and pass it off as your own.
#GrandadIsAnOldMan #GrandadsOtherChannel #Putarubberbandonit #Number4
