some force are acting with out any contact of surface.explain ?
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Magnetism is an example of a non-contact or action-at-a-distance force. These are forces which can act on an object without being in physical contact with it. The force of gravity is another example. Thus, gravity will pull a raindrop down to Earth without any tangible physical link between the Earth and the drop.
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When an object is resting on a surface it is exerting a downward force equal to its weight and this downward force is known as gravitational force. the gravitation is a force of attraction that exists between all bodies that have mass..... gravitation force does not need to be in contact exert its downward force.
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