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# The Physics of the Water Bottle Flip

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## Olivia Nye

on 19 February 2018

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#### Transcript of The Physics of the Water Bottle Flip

ANGULAR MOMENTUM / MOMENT of INERTIA

CENTER of GRAVITY

WATER LEVEL

BOTTLE’S PATH
Angular Momentum
Center of Gravity
Center of gravity
is where the mass of an object is centered and more importantly the point around which the object spins.
Water Level
Bottle's Path
not the same as if the bottle were completely full (a "solid")
hard to track
tracked points on logger pro using video I took
Tracking the Movement
The Physics of the Water Bottle Flip
4 Main Components:
Olivia Nye
Angular momentum
is the tendency of an object to continue spinning. It depends on the mass, size of the object, and how fast it is spinning.
water "climbs" up the sides
increases moment of inertia
decreases angular acceleration
Moment of Inertia
Rotational inertia, or a body's tendency to resist angular acceleration
similar to a diver
bottle appears to stop rotating before falling to the ground
imparted by "flicking wrist"
ω
ω
system is rotating around its moving center of gravity
water climbs sides -> increased resistance to rotational acceleration b/c mass is moving away from axis of rotation
starts at bottom when bottle is at rest
shifts as water bottle flips
hard to track due to the movement of the water within the bottle
moves back to original location during vertical descent
1/3 full
less: not enough to slow rotational motion
more: not enough space for water to move
acts more like a solid
Full transcript