TERRIBLE TWISTERTERRIBLE TWISTER

Presentation by: Elliptical FociPresentation by: Elliptical Foci

ObjectivesObjectives

To determine the specific To determine the specific forces exerted on the forces exerted on the body while riding the body while riding the Terrible TwisterTerrible Twister

To prove that the ride is in To prove that the ride is in fact safe for people of all fact safe for people of all shapes and sizesshapes and sizes

To understand the To understand the physics involved with the physics involved with the rideride

TWISTER

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Ride OverviewRide Overview The Terrible Twister is basically a huge barrel that spins The Terrible Twister is basically a huge barrel that spins

at such a speed that it allows you to stick to the inside of at such a speed that it allows you to stick to the inside of the wallsthe walls

Once up to a given speed the bottom of the barrel drops Once up to a given speed the bottom of the barrel drops out from under your feet for about 30 seconds out from under your feet for about 30 seconds

Then as the ride slows you begin to slide to the bottom Then as the ride slows you begin to slide to the bottom and come to a stopand come to a stop

Method of ResearchMethod of Research

Three Axis Force ProbeThree Axis Force ProbeMeasuring TapeMeasuring TapeVideo CameraVideo Camera Three axis probe

Measuring tape

Video camera

Force of gravity in Z direction (run #1)

Acceleration in the tangential in Y direction (run #1)

Acceleration in the X direction (run #1)

Force of gravity in Z direction (run #2)

Acceleration in the tangential in Y direction (run #2)

Acceleration in the X direction (run #2)

Force of gravity in Z direction (run #2)Force of gravity in Z direction (run #1)

Acceleration in the tangential in Y direction (run #2)

Acceleration in the tangential in Y direction (run #1)

Acceleration in the X direction (run #1)

Acceleration in the X direction (run #2)

The Good StuffThe Good Stuff

As the ride As the ride progresses there are progresses there are many different forces many different forces introduced.introduced.

In the “X” directionIn the “X” direction

VelocityVelocity

Centripetal forceCentripetal force

The Good StuffThe Good Stuff

As the ride As the ride progresses there are progresses there are many different forces many different forces introduced.introduced.

In the “Y” directionIn the “Y” direction

VelocityVelocity Min and MaxMin and Max

AccelerationAcceleration

Tangential forcesTangential forces

FrictionFriction

The Good StuffThe Good Stuff

As the ride As the ride progresses there are progresses there are many different forces many different forces introduced.introduced.

In the “Z” directionIn the “Z” direction

VelocityVelocity

AccelerationAcceleration GravityGravity

FrictionFriction

Modifications to MakeModifications to Make

Take the video camera and 3-axis at the Take the video camera and 3-axis at the same time same time

Not get sick…Not get sick…Take measurements from a force plate as Take measurements from a force plate as

well, to verify datawell, to verify dataMake sure and know how to work the Make sure and know how to work the

equipment with easeequipment with ease

ConclusionConclusion

The “terrible twister” was a good The “terrible twister” was a good experimental rideexperimental ride

We learned that this ride is safe for people We learned that this ride is safe for people of all shapes and sizes…even Prof. of all shapes and sizes…even Prof. WinslowWinslow

We all learned a great deal and most We all learned a great deal and most importantly, had funimportantly, had fun