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.
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The common misconception is that an object maintains its motion under the continuous application of an unbalanced force, which is incorrect.
We need to start pedaling again to counteract the friction forces and provide the necessary force to keep the bicycle moving.
When we stop pedaling, the bicycle begins to slow down due to the friction forces acting opposite to the direction of motion.
When the children push the box with a force greater than the friction force, there is an unbalanced force, causing the box to start moving.