The Physics Of A Yo

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Term Paper Title	The Physics Of A Yo
# of Words	645
# of Pages (250 words per page double spaced)	2.58

The Physics of a Yo

[Category]:

Science

[Paper Title]:

[Text]:

The Physics of a Yo-yo

In everything that we do, there is some aspect of physics involved in it.
Even if we are just standing still on the ground, or leaning up against a wall,
there are still numerous forces acting upon us. This paper will tell of the
physics involved in throwing a yo-yo.

When you release a yo-yo, gravity acts on its center of mass to pull the
yo-yo downward. Because the string of the yo-yo is wrapped around the yo-yo's
axle, and because one end of the string is attached to your finger, the yo-yo is
forced to rotate as it drops. If the yo-yo could not rotate, it would not drop.

Just as any object falling in a gravitational field, the rate of drop
increases with time (it decreases 9.8 meters every second to be exact) and so,
necessarily, does the rotation rate of the yo-yo. The rate of drop and the
rotation rate are greatest when the bottom is reached and the string is
completely unwound. The spinning yo-yo contains rotational kinetic energy taken
from the gravitation potential energy through which the yo-yo has dropped.

Usually, the string is tied loosely around the axle so that the yo-yo can
continue to spin at the bottom. Because the full length of the string has been
laid out, the yo-yo can drop no further and, consequently, the rotation rate
cannot increase further. If left in this condition, the friction between the
axle and the string will eventually dissipate the energy

Wallin, 2

of rotation or, equivalently, the rotational kinetic energy of the yo-yo and
the yo-yo will come to rest.

However, a momentary tug on the string causes the friction between the string
and the axle briefly to increase so that the axle no longer slips within the
string. When the axle stops slipping, the rotational kinetic energy of the
spinning yo-yo is large eno...

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