Question

Which statement accurately describes a balanced force?A- A marble resting on the sidewalk suddenly begins to roll downhill without being touched.B- A marble rolling downhill suddenly comes to rest at a garden wall.C- A 25-N force acts on the left side of the marble at the same time as a 25-N force acts on the right side of the marble.D- A 2-N force presses down on the marble at the same time as a 1.5-N force presses up on the marble.

Answer 1

Balanced forces are the forces that act in equal and opposite directions on the object such that the net force acting on the object is zero.

Under the action of balanced forces, there is no change in the motion of the object or there is no change in the velocity of the object that takes place.

In option A, the marble starts moving from the rest position, thus, the velocity of the marble is changing.

Thus, option A is incorrect.

In option B, the marble stops moving after some time, thus, there is a change in the velocity of the marble takes place.

Thus, option B is incorrect.

In option D, the magnitude of the force is different, thus, the forces do not cancel each other. The net force on the marble is not zero.

Thus, option D is incorrect.

In option C, both the forces are equal in magnitude and acting opposite in direction, thus, canceling the effect of each other.

Thus, the net force acting on the marble is zero.

Hence, option C is the correct answer.