Contact forces, which involve physical contact between two objects (e.g. friction, tension), and non-contact forces, which can act at a distance (e.g. gravity, electromagnetic force).
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The two categories of forces are contact forces, which occur when two objects are physically touching, and non-contact forces, which act between objects that are not in direct physical contact.
Contact forces act when two objects are physically touching each other. They can be classified into four categories: normal force, frictional force, tension force, and applied force. These forces can either be attractive or repulsive, depending on the nature of the interaction between the objects.
The force between two magnets is called magnetic force.
The two categories of classification of waves are based on their medium of propagation: mechanical waves, which require a medium to travel through, and electromagnetic waves, which can travel through a vacuum.
The two components that describe force are magnitude, which is the strength of the force, and direction, which indicates the line along which the force acts.