A force is basically a push or a pull. When a force is applied to an object it may cause the object to change direction, speed and/or size or shape. Forces can be measured using a Newton Meter. The unit use to measured force is the Newton (N).
Forces exist in pairs; they cannot exist independently. Objects pull or push back when a force is applied to them.
Please remember that the size of the force between two objects is always the same magnitude/size, but they push or pull in the opposite direction.
Types of forces
1. The Gravitational Force is basically the forces of attraction between all matters within the universe, especially as it relates to the attraction between the earth’s mass and objects near its surface.
2. Fiction is a force that occurs as a result of two objects interacting with each other. One object or the object moves over each other surfaces. Fiction usually results in energy generation. Fiction cause by air is called air resistance.
3. Centrifugal force is always balance by another force called the centripetal force. If one of those forces should be removed, the other will also be removed. Centrifugal force is the apparent out ward force that draws a rotating body away from the center of rotation and centripetal force is a force that acts on a body travelling in a circular path and is directed toward the center around which the body is moving.
N.B. There are other types of forces.
(The image was taken from Google image and the video from YouTube)
See video below for force.