Electromagnetic, nucear, and gravitational
Act the same anywhere in the universe
They act over a distance
Assosiated with charged particles
Can attract or repel
Electric Forces: Act between charged objects or particles
Magnetic Forces: Act on only metals and only certain particles, such as iron. Attraction to negative or positive ends of a magnet or metal. Simple stuffs
Strong Nuclear Forces: The forces that hold the nucleus of an atom together. 100 times stronger than the electric force of repulsion at 10^-15m
Weak Nuclear Forces: The same as strong nuclear force, but its weaker and acts in a smaller diameter (10^-18)
Gravitational Forces: Every object in the universe attracts every other object. It depends upon mass and distance. The closer and the more mass an object is, the more effect gravitaional force, and vice versa
--Gravity is the weakest universa force, but it is the most effective force over long distances.
The moon's inertia moves it away from Earth. Earth's gravitational force keeps the moon in the nearly circular orbit around Earth. A centripital force is a center-directed force that continuously changes the direction of an object to make it move in a circle.
--Natural Satelites
Artificial satelites are man-made satelites. Examples of this are satelites for monitring weather, radar maps, telescope, recieving/transmiting radio and microwave signals.