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Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

## A |
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## Acceleration | ||
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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 |
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## circumference | ||
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it is the outside of a circle. the equation is C=2 x 3.14/pi R | ||

## D |
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## Diameter | |||
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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 |
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## P |
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## period | |||
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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 |
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## Radius | |||
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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 |
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## speed | |||
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:the rate of motion, or equivalently the rate of change in position, many times expressed as distance | |||

## V |
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## Velocity | |||
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