Which of the following statement is correct regarding force?I. If an unbalanced force is applied on the object, there will be a change either in its speed or in the direction of its motion.II. To accelerate the motion of an object, a balanced force is required.

The question tests the effect of balanced versus unbalanced forces on the motion of a body.A balanced force is one where the net (resultant) force on the object is zero, so all the forces cancel out.An unbalanced force is one where the net force is non-zero; only such a force can produce acceleration.Statement I says that an unbalanced force changes either the speed or the direction of motion. This is true, because a non-zero net force produces acceleration, which alters the magnitude or direction of velocity.Statement II says a balanced force is required to accelerate an object. This is false, since a balanced force gives zero net force and therefore zero acceleration; an object under balanced forces stays at rest or moves with constant velocity.To accelerate a body you actually need an unbalanced (net) force, as stated by Newton's second law, F = ma.Hence only Statement I is correct.Only I is correct.

Which of the following statement is correct regarding force?

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