The velocity of the marble increases as it rolls down an inclined plane due to the unbalanced force of gravity acting on it.
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Galileo deduced that objects on an inclined plane, when no external force acts on them, move with a constant speed. This observation laid the foundation for understanding motion and inertia, highlighting that no force is needed to maintain constant velocity.
If the unbalanced force is removed completely, the object would continue to move with the velocity it has acquired up to that point.
An unbalanced force causes a change in either the speed or the direction of an object’s motion.
An object moves with a uniform velocity when the forces acting on it (pushing force and frictional force) are balanced, resulting in no net external force.