A spinning top, or simply a top, is a toy with a squat body and a sharp point at the bottom, designed to be spun on its vertical axis, balancing on the tip due to the gyroscopic effect.
Once set in motion, a top will usually wobble for a few seconds, spin upright for a while, then start to wobble again with increasing amplitude as it loses energy, and finally tip over and roll on its side.
Tops exist in many variations and materials, chiefly wood, metal, and plastic, often with a metal tip. They may be set in motion by twirling a handle with the fingers, by pulling a rope coiled around the body, or through a built-in auger (spiral plunger).
Such toys have been used since antiquity in solitary or competitive games, where each player tries to keep one's top spinning for as long as possible or achieve some other goal. Some tops have faceted bodies with symbols or inscriptions, and are used like dice to inject randomness into games or for divination and ritual purposes.
The ubiquity of spinning tops lends to the fact that the toy is used to name many living things such as Cyclosa turbinata , whose name comes from the Latin roots for spinning top.
Spinning tops emerged independently in various cultures worldwide and are considered among the oldest known toys discovered by archaeologists. They have been unearthed on every continent except Antarctica. For instance, tops were dating back to around 1250 BCE that have been found in China, while a carved wooden top from approximately 2000 BCE was discovered in King Tut’s tomb. [1] [2] Tops were used as toys in ancient Rome. [3]
Besides toys, tops have also historically been used for gambling and prophecy. Some role-playing games use tops to augment dice in generating randomized results; it is in this case referred to as a spinner.
Gould mentions maple seeds, celts (leading to rattlebacks), the fire-drill, the spindle whorl, and the potter's wheel as possible predecessors to the top, which he assumes was invented or discovered multiple times in multiple places. [2]
A top may be used to demonstrate visual properties, such as by James David Forbes and James Clerk Maxwell in Maxwell's disc (see color triangle). By rapidly spinning the top, Forbes created the illusion of a single color that was a mixture of the primaries: [4]
[The] experiments of Professor J. D. Forbes, which I witnessed in 1849… [established] that blue and yellow do not make green, but a pinkish tint, when neither prevails in the combination…[and the] result of mixing yellow and blue was, I believe, not previously known.
— James Clerk Maxwell, Experiments on colour, as perceived by the eye, with remarks on colour-blindness (1855), Transactions of the Royal Society of Edinburgh
Maxwell took this a step further by using a circular scale around the rim with which to measure the ratios of the primaries, choosing vermilion, emerald, and ultramarine. [5]
Smaller tops have a short stem, and are set in motion by twirling it using the fingers. A thumbtack may also be made to spin on its tip in the same way.
A typical fist-sized model, traditionally made of wood with a blunt iron tip, is meant to be set in motion by briskly pulling a string or rope tightly coiled around the body. The rope is best wound starting near the tip and progressing up along the widening body, so that the tension of the string will remain roughly constant while the top's angular speed increases.
These tops may be thrown forward while firmly grasping the end of the string and pulling it back. The forward momentum of the top contributes to the string's tension and thus to the final spin rate.
In some throwing styles, the top is thrown upside-down, but the first loop of the rope is wound around a stubby "head". Then, the sudden yank on the head as the string finishes unwinding causes the spinning top to flip over and land on its tip.
Alternatively, tops of this class may be started by hand but then accelerated and kept in motion by striking them repeatedly with a small whip.
Some larger models are set in motion by means of a built-in metal auger (spiral plunger). In these models, the actual top may be enclosed in a hollow metal shell, with the same axis but decoupled from it; so that the toy may appear to be stationary but "magically" balanced on its tip.
Some modern tops are kept perpetually in motion by spinning magnetic fields from a special ground plate.
Gould classifies tops into six main types: twirler, supported top, peg-top, whip-top, buzzer, and yo-yo. [6]
Modern tops have several sophisticated improvements, such as ball bearings of ruby or a hard ceramic like tungsten carbide, that reduces the friction with the ground surface. Functional art tops have become collectibles built using varied techniques in metal-working, glass-working, and wood-working.
The motion of a top is described by equations of rigid body dynamics, specifically the theory of rotating rigid bodies.
Because of the small contact area between the tip and the underlying surface, and the large rotational inertia of its body, a top that is started on a hard surface will usually keep spinning for tens of seconds or more, even without additional energy input.
Typically the top will at first wobble until friction and torque between the tip and the underlying surface force it to spin with the axis steady and upright. Contrary to what is sometimes assumed, longstanding scientific studies (and easy experimentations reproducible by anyone) show that reducing the friction increases the time needed to reach this stable state (unless the top is so unbalanced that it falls over before reaching it). [8] After spinning upright (in the so-called "sleep" position) for an extended period, the angular momentum will gradually lessen (mainly due to friction), leading to ever increasing precession, finally causing the top to topple and roll some distance on its side. In the "sleep" period, and only in it, provided it is ever reached, less friction means longer "sleep" time (whence the common error that less friction implies longer global spinning time).
The total spinning time of a top is generally increased by increasing its moment of inertia and lowering its center of gravity. [8] These variables however are constrained by the need to prevent the body from touching the ground.
Asymmetric tops of virtually any shape can also be created and designed to balance. [9]
There are many official competitions for top spinning as a sport, such as the U. S. National Championships and the World Championships. During the COVID-19 pandemic contests would be often held online, with contestants submitting videos. [10]
The Jean Shepherd story "Scut Farkas and the Murderous Mariah" revolves around top-spinning in the fictional Depression-era American city of Hohman, Indiana. The bully and the named top in the title are challenged by Shepherd's ongoing protagonist Ralph and a so-called "gypsy top" of similar design to Mariah named Wolf. [11]
The Top is a short story by bohemian writer Franz Kafka. [12]
Rock band The Cure released The Top album in 1984, named, and at least partially inspired, by the toy of the same name. The album includes the title track in which the sound of a spinning top can be heard at the beginning of the song.
The top is a focal element and metaphysical symbol in the movie Inception (2010), directed by Christopher Nolan and starring Leonardo DiCaprio. In the final shot, the camera moves over the spinning top just before it appears to be wobbling. [13]
In 2022, an Armenian-styled spinning top, with the song "Spin the Magic", was chosen as the theme art and the main motif for the 20th edition of Junior Eurovision Song Contest, which will be held in Yerevan, Armenia. [14]
A flywheel is a mechanical device that uses the conservation of angular momentum to store rotational energy, a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed. In particular, assuming the flywheel's moment of inertia is constant then the stored (rotational) energy is directly associated with the square of its rotational speed.
A yo-yo is a toy consisting of an axle connected to two disks, and a string looped around the axle, similar to a spool. It is an ancient toy with proof of existence since 440 BC. The yo-yo was also called a bandalore in the 17th century.
The diabolo is a juggling or circus prop consisting of an axle and two cups or discs derived from the Chinese yo-yo. This object is spun using a string attached to two hand sticks. A large variety of tricks is possible with the diabolo, including tosses, and various types of interaction with the sticks, string, and various parts of the user's body. Multiple diabolos can be spun on a single string.
A dreidel, also dreidle or dreidl, is a four-sided spinning top, played during the Jewish holiday of Hanukkah. The dreidel is a Jewish variant on the teetotum, a gambling toy found in Europe and Latin America.
A whirligig is an object that spins or whirls, or has at least one part that spins or whirls. It can also be a pinwheel, spinning top, buzzer, comic weathervane, gee-haw, spinner, whirlygig, whirlijig, whirlyjig, whirlybird, or simply a whirly. They are most commonly powered by the wind but can be hand-, friction- or motor-powered. They can be used as kinetic garden ornaments, and can be designed to transmit sound and vibration into the ground to repel burrowing rodents.
Astrojax, invented in 1986 by Larry Shaw, is a toy consisting of three balls on a string. In the original version of the toy, one ball is fixed at each end of the string, and the center ball is free to slide along the string between the two end balls. Inside each ball is a metal weight. The metal weight lowers the moment of inertia of the center ball so it can rotate rapidly in response to torques applied by the string. This prevents the string from snagging or tangling around the center ball.
A rattleback is a semi-ellipsoidal top which will rotate on its axis in a preferred direction. If spun in the opposite direction, it becomes unstable, "rattles" to a stop and reverses its spin to the preferred direction.
Rotation around a fixed axis or axial rotation is a special case of rotational motion around an axis of rotation fixed, stationary, or static in three-dimensional space. This type of motion excludes the possibility of the instantaneous axis of rotation changing its orientation and cannot describe such phenomena as wobbling or precession. According to Euler's rotation theorem, simultaneous rotation along a number of stationary axes at the same time is impossible; if two rotations are forced at the same time, a new axis of rotation will result.
A trompo is a top which is spun by winding a length of string around the body, and launching it so that lands spinning on its point. If the string is attached to a stick the rotation can be maintained by whipping the side of the body. The string may also be wound around the point while the trompo is spinning in order to control its position or even lift the spinning top to another surface.
A spinnerbait or spinner is any one of a family of hybrid fishing lures that combines the designs of a swimbait with one or more spoon lure blades. Spinnerbaits get the name from the action of the metallic blades, which passively revolve around the attachment point like a spinning propeller when the lure is in motion, creating varying degrees of vibration and flashing that mimic small fish or other preys of interest to large predatory fishes. The two most popular types of spinnerbaits are the in-line spinner and safety pin spinnerbait, though others such as the tail spinner also exist. Spinnerbaits are used principally for catching freshwater fishes such as perch, pike and bass.
Twirling is a form of object manipulation where an object is twirled by one or two hands, the fingers or by other parts of the body. Twirling practice manipulates the object in circular or near circular patterns. It can also be done indirectly by the use of another object or objects as in the case of devil stick manipulation where handsticks are used. Twirling is performed as a hobby, sport, exercise or performance.
Pambaram, also called the Lattu (Urdu: لٹو), Latim, Bhawra, Buguri, or Bongaram, is a traditional throwing top used mainly in India and Bangladesh.
A tippe top is a kind of top that when spun, will spontaneously invert itself to spin on its narrow stem. It was invented by a German nurse, Helene Sperl in 1898.
Object manipulation are when you dexterity play in which one or more when their people physically interact is when they play with one or more or many object. Many object manipulation skills are recognised circus skills. Other object manipulation skills are linked to sport, magic, and everyday objects or practices. Many object manipulation skills use special props made for that purpose: examples include the varied circus props such as balls, clubs, hoops, rings, poi, staff, and devil sticks; magic props such as cards and coins; sports equipment such as nunchaku and footballs. Many other objects can also be used for manipulation skills. Object manipulation when the ordinary items may be not considered there to be the object manipulation because it is when the object isn't used into an the unusually stylised or skilful way or for a when physical interaction is outside of its socially acknowledged context or when differently from its original purpose.
A gyroscopic exercise tool is a specialized device used in physical therapy to improve wrist strength and promote the development of palm, wrist, forearm, and finger muscles. It can also be used as a unique demonstration of some aspects of rotational dynamics. The device consists of a tennis ball-sized plastic or metal shell surrounding a free-spinning mass, with an inner heavy core, which can be spun by a short rip string. Once the gyroscope inside is going fast enough, the person holding the device can accelerate the spinning mass to high rotation rates by moving the wrist in a circular motion. The force enacted on the user increases as the speed of the inner gyroscope increases.
The upright spin is one of the three basic figure skating spin positions. The International Skating Union (ISU), the governing body of figure skating, defines an upright spin as a spin with "any position with the skating leg extended or slightly bent which is not a camel position". It was invented by British figure skater Cecilia Colledge. Variations of the upright spin include the layback spin, the Biellmann spin, the full layback, the split, the back upright spin, the forward upright spin, the scratchspin, and the sideways leaning spin.
A pullstring, pullcord, or pullchain is a string, cord, or chain wound on a spring-loaded spindle that engages a mechanism when it is pulled. It is most commonly used in toys and motorized equipment. More generally and commonly, a pullstring can be any type of string, cord, rope, or chain, attached to an object in some way used to pull or mechanically manipulate part of it.
String is a long flexible structure made from fibers twisted together into a single strand, or from multiple such strands which are in turn twisted together. String is used to tie, bind, or hang other objects. It is also used as a material to make things, such as textiles, and in arts and crafts. String is a simple tool, and its use by humans is known to have been developed tens of thousands of years ago. In Mesoamerica, for example, string was invented some 20,000 to 30,000 years ago, and was made by twisting plant fibers together. String may also be a component in other tools, and in devices as diverse as weapons, musical instruments, and toys.
In physics, angular mechanics is a field of mechanics which studies rotational movement. It studies things such as angular momentum, angular velocity, and torque. It also studies more advanced things such as Coriolis force and Angular aerodynamics. It is used in many fields such as toy making, aerospace engineering, and aviation.