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Copy of Academy: Inserting Animations in Prezi
Transcript of Copy of Academy: Inserting Animations in Prezi
Side Cap Bearing
There is evidence to suggest that a type of weapon similar to the yoyo was used for hunting in the Philippines from the 16th century onwards. It is thought that this could have lead to its use as a toy by Filipino children and even the adoption of the name 'yoyo' which means 'come back' in the native language of the area. In ancient Greek society a young man would often mark his passage into adulthood by giving up his toys as a sacrifice to the gods, so this may have been the function of these decorative ceramic yoyos. Yo-yo Sam Carvajal
Kevin Lim PHYSICS The yoyo is thought to have originated in China in 1000B.C. It is thought that this makes the yoyo the second oldest toy in the world (the doll is at number one). "a toy which consists of a circular object that can be made
to go up and down a long piece of string to which it is tied"
(Cambridge University Press Dictionary) The earliest surviving examples have been dated to around 500B.C IN Greece. The earliest surviving evidence is on display in the National Museum of Athens in Greece. 21st century WORLD VIEW YO-YO MATERIALS The yo-yoist must give a slight tug on the
string as the yo-yo rewinds,
in order to compensate
for the energy lost IN friction. The yo-yo spool falls straight to the ground, which builds a certain amount of
linear momentum (momentum in a straight line). When the yo-yo is released, both
forms of potential energy change
to kinetic energy. "To a physicist... a yo-yo is a remarkably fun example of a flywheel," The spinning motion gives the yo-yo
gyroscopic stability. The string unwinds, and the spool spins, which builds angular momentum (momentum of rotation). When the yo-yo is held, it has a certain amount of potential energy. ThE air resistance also eats away
at the YO-yo's energy supply. Things that are moving like to carry on moving. We call this phenomenon momentum (loosely
speaking, momentum means "mass in motion”) “Flywheels, used in numerous things from fuel efficient cars to cutting edge fusion research, are simply ways to store energy in a spinning disk.
For such a simple toy, the yo-yo stores energy in spinning motion in a remarkably clever way.” A yo-yo might look like a toy, but it's also an energy converting machine. 2 types of momentum potential kinetic Moment of inertia is a measure of an
object's resistance to any change
in its state of rotation. wood aluminum plastic Weight Rings
Side Cap Bearing
Counterweights Yo-yo string is usually one long strand, that goes down from the finger, loops around the axle (except off string) and goes back up to the finger. Between the axle and the finger the two ends of the strand are twisted together (note that some manufacturers offer 'left handed' string that is twisted the other way). At the finger end there is usually a slip knot. The axle is what keeps both halves of the yo-yo together. Originally the yo-yo would spin freely on the axle in the string loop. After the invention of the transaxle and the ball bearing, the transaxle or bearing sits on the axle to reduce friction. AXLES
STRING The halves of a yo-yo are the two side sections that are joined together on each side of the axle and may be detached from or permanently secured to the axle. The halves can be disassembled to remove knots or perform maintenance. Ball bearings, in the context of yo-yo play, were introduced in the early 1990s. They are used to reduce friction while the yo-yo is sleeping P A R T S O F A Y O Y O Additional Parts Titanium Magnesium Steel Advantages:
-Can be easily turned
-Looks and feels nice
-Uneven density, making a yo-yo often slightly wobbly
-Difficult to process other than by turning. While it is technically possible to machine a starburst into a wooden yo-yo, it is usually not done for reasons of economy.
-Insufficient density for modern yo-yo shape Advantages:
-Slightly more dense than most plastics (and won't have air bubbles like some plastics resulting in smoother play)
-Usually smoother and has less friction than plastic giving better grinds
-Anodization allows many different colors to be made
-Expensive compared with plastic alternatives
-It is easy to get dings or scratches if it makes contact with rough surfaces
-Resonates easily, resulting in an annoying ringing during play Advantages
-As strong as steel, but lighter, so it is possible to increase a yo-yo's rim weight beyond that of aluminum.
-Raw titanium finish does not oxidize to a dull color as fast as Aluminum
-Resistant to scratches
-Sparks when "walked the dog" on concrete
-Significantly more expensive than aluminum ($100 vs $300, Al vs. Titanium)
-Anodize finishes are limited in comparison to aluminum, since color changes are -accomplished by increasing the thickness of the native oxide layer. Advantages
-Can be machined to very precise tolerances
-Can be anodized or powder coated
-Harder to work with than aluminum
-Flammable in powder form Advantages
-Heavy enough to make an undersized yoyo feel like a bigger yoyo
-Can be anodized
-Less easy to ding and dent than aluminum
-Too heavy for use in a full-sized yo-yo
-Has the ability to rust Advantages:
-Easily molded into nearly any shape
-Easily dyed any color
-Has good rotation and stability
-Molding often leaves sharp edges
-Difficult to mold without enclosing gas bubbles Newton's first law of motion states that "An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force." Different types of yoyo tension force is the force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends. major parts Static friction
Rolling frictional friction
Fluid frictional friction yoyo