What is "when there is no friction?

When there is no friction, objects would continue to move indefinitely, unless acted upon by an external force. A ball thrown on a smooth surface would keep moving forward in a straight line without slowing down. Additionally, it is more difficult to initiate movement without the frictional force to push against. In real-world scenarios, there is no such thing as a completely frictionless environment, as there will always be some degree of resistance between surfaces. However, certain materials, such as superconductors, can come close to achieving this state, which allows for phenomena like levitation and near-infinite energy transfer.