3. Distinguish between:
(a) contact and non-contact force
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contact forces are those forces which can be experienced when object is in touch like frictional force and non contact just its opposite like gravitational force
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Contact force occurs due to the contact between two different objects. Non-contact force occurs due to either attraction or repulsion between two objects such that there is no contact between these objects. The frictional force is an example of a contact force. Gravitational force is an example of a non-contact force.
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