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Our glossary for High Dive



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A

Picture of Mikko Harvey

Acceleration

by Mikko Harvey - Tuesday, October 23, 2007, 05:17 PM
 
The rate of change of velocity. For example, an object that is travelling one foot per second after one second, three feet per second after two seconds, and five feet per second after three seconds, is accelerating at two feet per second squared.
 

C

Picture of Hannah Malenfant

circumference

by Hannah Malenfant - Tuesday, October 23, 2007, 01:21 PM
 
it is the outside of a circle. the equation is C=2 x 3.14/pi R
 

D

Picture of Peter Ryan

Diameter

by Peter Ryan - Tuesday, October 23, 2007, 05:54 PM
 
The diameter of a circle is any straight line that passes through the center of a circle, and has two endpoints on the edge of the circle. The diameter of a circle is also two times the radius of any given circle. For example, if the radius of a circle is 1.5, the diameter of that circle is 3.

In a unit circle where the radius is 1, any straight line that goes from one end of the circle to the other and passes through the center of the circle is the diameter, and is 2.

Most often in the High Dive unit we are dealing with a ferris wheel with a radius of 50 feet, which makes the diameter of that same ferris wheel 100 feet.
 

F

Picture of Ryan Prothro

Ferris

by Ryan Prothro - Monday, October 22, 2007, 08:05 PM
 
The Ferris wheel got it's name from the man who designed it: George Washington Gale Ferris Jr. who designed the first Ferris wheel thats stood 264 feet tall. the wheel was built in Chicago Illinois for it's World's Columbian Exposition in 1893. This giant wheel was held a whopping 2,160 people (there where 36 cars and each held 60 people) ! ! One rotation took 10 minutes! Original Ferris wheel
First ferris wheel
 

P

Picture of jonah vorspan-stein

period

by jonah vorspan-stein - Tuesday, October 23, 2007, 01:15 PM
 
A period is the time it takes for an object to complete an entire process or cycle, and return to its starting position. In the case of the ferris wheel, the period is the time it takes from when the rider starts riding at the 3:00 position, to when to the rider rotates around the ferris wheel and returns to this position.
 

R

Picture of Martin Kessler

Radius

by Martin Kessler - Wednesday, October 3, 2007, 09:37 PM
 

This is the distance from the center of a circle to any point on the circle. The radius is very useful for determining the area and circumference of a circle. Area = Pi x radius^2. Circumference = 2 x pi x radius. Radius is half of the diameter. In this unit, the ferris wheel is the circle and the distance from the center of the ferris wheel to any point on the wheel is the radius. This is perticularly useful for determining the distance from the ground at any point because you can use the radius as the hypotenuse of a triangle. 

 

S

Picture of Peter Sullivan

sine

by Peter Sullivan - Monday, October 22, 2007, 06:59 PM
 

        The sine is a ratio.  One definition uses a right triangle: the sine is the ratio between the leg opposite from the angle used and the hypotenuse.  For example the sine of 30 degrees is .5 which means the leg opposite the 30 degree angle divided by the hypotenuse is always .5.

         This definition can also be extended to any angle, not just angles in a right triangle.  This definition uses a co-ordinate plane and uses the vertical distance y in place of the opposite leg, and the line forming the angle with y is called r and replaces the hypotenuse.

          Sine is used to find a distance when a distance and an angle are given.  This information can be plugged into the ratio to determine the missing distance.

 
Picture of Isaac Bell

speed

by Isaac Bell - Tuesday, October 23, 2007, 01:14 PM
 

:the rate of motion, or equivalently the rate of change in position, many times expressed as distance d traveled per unit of time t.

 

V

Picture of Hannah Sears

Velocity

by Hannah Sears - Monday, October 22, 2007, 08:10 PM
 
Velocity is similar to speed (see speed), but velocity has a direction. Specifically, velocity is the rate of change in the position of an object in a given direction (up or down, left or right, etc). It is given in units of distance/time (feet/second, miles/hour, etc).