The motion a body to spin about an axis
Typically refers to a solid object
Circular Motion
A point that rotates about a single axis
r= radius
s= arc length
360°= 2πr= 2πrad
Radians- the angle who’s arc length is equal to its radius.
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Approximately every 57.5°+S = counterclockwise
-S = clockwise
Tangential Speed
The speed of something moving in a circular path, direction of motion is always tangent to the circle.
Angular speed is the same.
The Universal Law of Gravitation
Gravitational force- an attractive force which exists between all objects
g- gravitational field strength
The amount of force acting on each Kg of mass.
Inverse Square Law of Gravity
The force acting on an object inversely on the square of the distance from earth's center
F- force of attraction
m- mass of each object
d- distance in meters between 2 objects
G- constant = 6.67 x 10^-11
1. Forces are = but opposite
2. Forces attraction is governed by the inverse square law
3. No value of d which would reduce the force of attraction to 0.
4. G is small, the force of gravity is significant if one or both objects are massive.