MECHANICS - MOTION IN TWO DIMENSIONS - CENTRAL FORCES NC State University Faculty Access

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Whirligig
# 1D50.20


Description: This demonstration shows the magnitude of centripetal force is not necessarily dependant on the spinning mass but also on other factors like angular velocity and radius of travel.

Instructions: A small mass and a large mass are connected together by a string that passes through a cylinder. When you hold the cylinder, the large mass falls pulling the smaller mass to the cylinder. If the small mass is then spun in a circle at a high enough angular velocity, the tension in the string will be enough to hold up the larger mass. Different angular velocities will lift of lower the heavy mass.

Hazards: Be careful that a student (or demonstrator) is not in the path of the smaller moving object.

Parts: One Whirligig

Purchased/Built: built

Quant. in Demo Room: 1

Demo References
The Video Encyclopedia of Physics Demonstrations Disc 05-17 A string with a rubber ball on one end passes through a plastic sleeve and weights are attached to a loop at the other end.
Sutton M-138 Two balls - 1 kg, 100 g - are attached to the ends of a 1 m string passing through a small hollow tube. Twirl a ball around your head.
Freier and Anderson Mm-2 A large and small ball are on opposite sides of a string threaded through a handle.
The American Journal of Physics AJP 29(3),212 Use a glass tube for the holder and rubber stoppers for the masses.

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