
©2014 4M Industrial Development Limited. All rights reserved.
3
4
1
1. Push together the two halves of the wheel (Part 10). Push the wheel onto the pin on the stand (Part 12). Secure the wheel with the wheel
lock (Part 11).
2. Take one of the weight capsules from the balance bar. Fit the hook on the capsule to the hole in the unicycle stand, at the opposite end
of the wheel. The pin on the stand should fit into the slot at the bottom of the weight capsule.
3. Push the pin at the end of the unicycle stand into the holes in the lower part of one of the robotʼs legs.
4. The unicycle needs a gently sloping string to run on. Attach the two ends of the string (Part 13) to objects of different heights. You can
use drinks bottles filled with water, the backs of chairs, or bedposts. Ask a friend to help you with this trick by catching the robot at the end
of its run along the string. Place the unicycle's wheel on the string at the highest end, with the robot above the string and the weight capsule
hanging underneath. Release the robot and watch it ride down the string! Also, try changing the slope of the string and the number of coins
inside the weight capsule to test how these factors affect the speed of the unicycle.
E. TROUBLESHOOTING
• If the robot does not balance, make sure the weight capsules are hanging under the part of the robot that you want the robot to balance
on. You could also try adjusting the angle of the balance bar.
• If the robot does not move along the string, make sure the wheel is turning freely, and that the string is steep enough to make it run.
F. HOW IT WORKS
All objects, such as this robot, have a point on them called the centre of gravity. The centre of gravity is where the weight of the object is
primarily concentrated. When an object balances, its centre of gravity is vertically above or below the point where the object is balanced.
The lower down that an object's centre of gravity is, the more stable the object is. The robot's centre of gravity is in the centre of its hips.
But when you put the balance bar on the robot, its centre of gravity moves to a point below its feet. This makes it balance easily on its nose,
head, feet or hands. The same thing happens when you add the weight capsule to the unicycle.
G. FUN FACTS
• When you are standing up straight or lying flat, your centre of gravity is in the middle of your tummy.
• When you stand up straight with your feet together, you stay balanced because your centre of gravity is vertically above your feet. If
somebody gives you a push, your centre of gravity is no longer over your feet, and you will topple over.
• A tight-rope walker stays in balance by keeping his or her centre of gravity directly above the weight.
• Tight-rope walkers often carry long, flexible poles in their hands. The pole helps a tight-rope walker by making his or her centre of gravity
lower.
• The Leaning Tower of Pisa doesnʼt fall because if you drew a vertical line down from its centre of gravity, that line would fall within its
base. It is believed that when the tower leans further and the line from its centre of gravity passes out of its base, it will fall down.
H. QUESTION & COMMENTS
We value you as a customer and your satisfaction with this product is important to us. If you have comments or questions, or you find
any part of this kit missing or defective, please do not hesitate to contact our distributor in your country. You will find the address printed
on the package. You are also welcome to contact our Marketing Support Team: Email: infodesk@4m-ind.com, Fax (852) 25911566, Tel:
(852) 28936241, Web site: WWW.4M-IND.COM
D. UNICYCLE TRICK
41-03364/1 141031
10
12
11
2