Why Does a Yo-Yo Yo?

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Vocabulary

attach Trans. IMG
- (attached) join, connect, link
axle Trans. IMG
- a rod or spindle (either fixed or rotating) passing through the center of a wheel or group of wheels
bottom Trans. IMG
- lowest surface
friction Trans. IMG
- the resistance to motion of two moving objects that touch
gravity Trans. IMG
- the force that attracts a body toward the center of the earth
inertia Trans. IMG
- a tendency to do nothing or to remain unchanged
loop Trans. IMG
- a shape produced by a curve that bends around and crosses itself
momentarily Trans. IMG
- for a very short time
spin Trans. IMG
- (spun) rotate, twist
unwind Trans. IMG
- (unwound) to undo something that is rolled

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