Q1. Define frictional force. Explain why, frictional force is said to be a contact force.
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Frictional force is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
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Friction is nothing but the opposing force applied on an object, in the opposite direction of the motion of the object. Friction is caused due to contact of two or more than two object, so frictional force is often called contact force. Frictional force comes into play only when two surfaces are in contact.
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