Question

what is contact and non.contact forces ??

Answer 1

CONTACT FORCE:- A force that can cause or change motion of an object by touching it. Motors and gears operate through contact forces.

NON- CONTACT FORCE:- Force that results when the two objects are not in physical contact with each other, yet are able to exact a push or pull.

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Answer 2

 contact force is any force that requires contact to occur.[1] Contact forces are ubiquitous and are responsible for most visible interactions between macroscopiccollections of matter. Pushing a car up a hill or kicking a ball or pushing a desk across a room are some of the everyday examples where contact forces are at work. In the first case the force is continuously applied by the person on the car, while in the second case the force is delivered in a short impulse. Contact forces are often decomposed into orthogonal components, one perpendicular to the surface(s) in contact called the normal force, and one parallel to the surface(s) in contact, called the friction force.[1]
 non-contact force is a force which acts on an object without coming physically in contact with it.[1] The most familiar example of a non-contact force is gravity, which confers weight.[1] In contrast a contact forceis a force applied to a body by another body that is in contact with it.[1]