Pg.+28+-+35

=﻿Physics=

toc =﻿Circular Motion=


 * Explanations**

Circular motion is the movement of an object at a constant speed around a circle with a fixed a radius. It's speed can be determined by the circumference of the circle, and the acceleration the object does.

Axis - straight line aroung which rotation takes place Rotation - object turns around an internal axis Revolution - object turns around an external axis Linear speed - distance over time Tangential speed - speed along a circular path Rotational speed - number of rotations per unit of time
 * Definitions**

Tangential speed - V = ro Centripetal Force - Fnet = mv2/r Circumference - C = 2nr Centripetal Acceleration - Ac = v2/r Revolutions - R - D/C
 * Formulas**

=﻿Universal Gravitation=

Isaac Newton theorized that gravitation forces had a part in the acceleration that objects would have on the moon and the earth. An example is a cannonball, fire horizontall at earth, it will eventually fall to the earth. If the right velocity i used, it would completely travel around the Earth, never reaching the Earth. Newton's Law of Universal Gravitation states that any two objects in the universe exert gravitational attraction on each other, and this applies all to all objects.
 * Newton's Law**

As the mass of either object or both increases as time passes, the force of gravitational attraction increases Ex: 1M 1F 1M, 2M 4F 2M As the distance separating two objects increases, the force of attraction becomes exponentially smaller. Ex. 1d = F, 2d = 1/2 F, 1/2d = 4F
 * Effects by Mass and Distance**

Fgrav=Gm1m2/d2 G = Universal Gravitation Constant = 6.67 x 10-11 Nm2/kg2
 * Formula and Constant**



=﻿Coulomb's Law=

It is very much like Newtonw's Law of Gravity, but it deals with electricity. It was discovered by French Scientist, Charles Coulomb in the 18th Century, where the law was named after him. The law deals with the relationship between electrical charges and distance. Formula - F =KqAqB/d2, F = Force, K = (electrical proportionality constant) 9.0 x 10 9NM2/C2, q = charge (C for Coulomb), d = distance (m)
 * The Law**

The SI Unit of measure for electrical charge is Coulomb (C) Charge of 1 proton is +1.6 x 10-19C Charge of 1 electrong -1.6 x 10-19C The charge (q) of a particle is not a vector quantity, therefore when described as "positive" or "negative" that tells whether its is proton or electron, but is not part of the magnitude of the charge. Do NOT put negative in the formula!
 * Important Info**

Electric field - a vector quantity that relates the force exerted on a charge to the size of the charge The magnitude of the electric field is measured in N/C (Newtons/Coulomb) Electric field lines are the directions of arrows that indicate the charge of the field. The lines are away from a positively charged object, and toward a negatively charged object. The strength of the field is denoted by the spacing between the lines. (close = strong)
 * Electric Fields**