what is fictional force?

The force which opposes the motion of a body is called frictional force. For example, when you rub two stones against each other, sparks are produced due to friction, called the kinetic friction.The friction present when a body is at rest is called static friction. To move a body from rest one has to apply force greater than the static friction.

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its fictional or frictional?

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it is the force that opposes motion. it is caused by the irregularities of the surface of both the plane and the object.

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