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In physics, force is used to describe the interaction between two objects that results in a push or pull between them. The objects experience the force only when there is an interaction. When the interaction does not exist, the objects no longer experience the force. Force is proportional to acceleration. The SI unit for force is the Newton (N). According to Newton's second law of motion, the force (F) applied to an object is related to its mass (m) and acceleration (a) by F=ma. One Newton of force is equal to 1 kg × 1 m/s² which is the amount of force required to move a mass of 1 kg at an acceleration of 1 m/s². There are two types of forces: contact and action-at-a-distance.

Contact forces are the forces which result when two objects come in direct physical contact with each other, such as frictional and tension forces.

Action-at-a-distance forces are resulted from the interaction of two objects which are separated in the empty vacuum of space, such as gravitational and electromagnetic forces.
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Trivia  •  Fun Facts

Do you know?
"May the Force be with you."
You probably heard the phrase in the Star Wars movies. It was a phrase used as a formal "goodbye" and "good luck" among Jedi. However, in physics, "force" is used in different ways.

"Good bye, old friend. May the Force be with you." - Obi-Wan Kenobi, to Anakin Skywalker in the movie "Star Wars Episode III: Revenge of the Sith"