Chapter+7+Rotation+and+Gravity

=**Chapter 7 Roataion and Gravity**=
 * By Zach Bishop**

**7.1 Angular Speed And Angular Acceleration**

 * Angular is defined as motion in a circle. The primary unit is radians found by deviding the distance around**
 * a circle by it's radius.** **The angular velocity of an object is it's change in diplacement over the change in time.**
 * Aclereration is found by deviding the change in velocity by the change in time. Both of these formulas are the**
 * same as those for liniar motion.**

7.2 Rotational Motion Under Constant Angular Acceleration

 * all of the folowing formulas require the object that is moving to be moving at constant acceration.**
 * These formulas can be used to determine the new speed or change in displacement. All of these formulas are**
 * similar** **to thier linear counterparts.**

7.3 Relations Between Angular And Linear Quantities
When an object rotatesabout a fixed axis the angular speed and angular acceration are proportional to thier tangent velocity.

7.4 Centripetal Acclereation
Any object moving in a circular path are pull toward the center of the circle by a foce. this force can be determined the by the formula below.

7.5 Newtonian Gravity
Newton believed that every object had a force of gravity on every other object. That force is directly proportional to the product of thier masses and inversely proportional to the square of the distance between them. This is called the theory of universal gravitation and uses the universal gravitation constant of G which is equal to 6.673*10^-11. The potential energy near the surface is determined by the second formula.

7.6 Kepler's Laws
Kepler's laws describe the motion of the planets and explain the specifics of thier travel. His first law states that all planets travel in elliptical orbits with the Sun at one of the focal points. The second law states that a line drawn to any planet sweeps out equal areas in equal time intervals. His third law states that the square of the orbital period is proportional to the cube of the average distance from the sun; this third law can be applied to planets and satalites as well.

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