the force - is cause only when the two bodies are contact of in each other surface
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Explanation:
Frictional force always acts parallel to two planes in contact with each other and in a direction opposite to that of relative motion of the two bodies. 2. Frictional forces are caused due to intermolecular interactions between the bodies. ... Frictional force is more for rough surface and less for smooth surfaces.
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not always
Explanation:
contact forces only require to be in physical contact Ex: friction and muscular force but there are also non-contact forces like gravitational force .the correct definition would be force is caused due to the Intraction between 2 objects
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