define force. describe with suitable example,the contact and non contact ( action-at-a-distance)forces
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Push or pull of an object is force.
Contact force: In which the two bodies are in contact, one which applies the force and the other on which the force is applied.
Example: Friction, like in friction to surfaces must be in contact.
Other examples: muscular force.
Non contact force: The force in which the two bodies described above need not be in contact.
Example: Gravitational force: if you drop an object from your hand it will go towards the floor due to gravitational force clearly the two bodies ( the object and the earth) are not in contact.
Other examples: electrostatic force, magnetic force
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