Shelby&AndrewsProject

toc =Definitions=

__Circular Motion__ Movement of an object at constant speed around a circle with fixed radius __**Axis:**__ Straight line around which rotation takes place __**Tangential Speed:**__ Speed along a circular path
 * __Rotation:__** Object turns around an internal axis
 * __Revolution:__** Turns around an external axis
 * __Rotational Speed__**: Number of unit of time
 * __Linear Speed:__** Distance/Time
 * __Centripetal Force__**: Force that cause an object to follow a circular path
 * __Centripetal Acceleration__**: Always points towards the center of the circular motion

__Newton's Law of Universal Gravitation__ __**Universal Gravitation and Mass:**__ As mass of an object or both objects increases force of gravitational attraction increases __**Universal gravitation and distance:**__ As distance separating two objects increases; the force of attraction is exponentially smaller.

__Friction__ The rubbing of one object to another __**Static Friction:**__ is not in relative motion
 * __Kinetic Friction:__** surfaces are in relative motion

__Columbus Law__
 * __Equals:__** The relationship among electrical forces, charges and distance

=Videos= media type="custom" key="7676785" media type="custom" key="7676975" media type="custom" key="7677047" =Formulas=

=Explanations= //Circular motion// A body that travels an equal distances in equal amounts of time along a circular path has a constant [|speed] but not constant velocity. This is because velocity is a vector and thus it has magnitude as well as direction The velocity of P is directed along the tangent at P. The speed remains constant but the velocity has changed. We know that if the velocity changes with time then the ball on the string is also [|accelerating.]

http://www.splung.com/content/sid/2/page/circular

//Newton's Law of Universal Gravitation// states that every massive particle in the universe attracts every other massive particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. (Separately it was shown that large spherically-symmetrical masses attract and are attracted as if all their mass were concentrated at their centers.) http://en.wikipedia.org/wiki/Newton%27s_law_of_universal_gravitation

Friction is the [|force] resisting the relative motion of solid surfaces, fluid layers, and/or material elements sliding against each other. It may be thought of as the opposite of "slipperiness". http://en.wikipedia.org/wiki/Friction