Question

Newton's first law of motion states that an object remains at rest unless an_____________ force acts on it.

Answer 1

1. As we know by the law of inertia, the body remains at rest or moves with constant velocity in a straight line until an unbalanced external force is applied.
2. To change the direction and velocity of the body.

Hence, Newton's first law of motion states that an object remains at rest unless an external force acts on it.