* Friction requires contact: Friction is a force that opposes motion between two surfaces in contact. If there's no contact, there's no friction.
* Examples of motion without friction:
* Objects moving in a vacuum: A satellite orbiting Earth in the near-vacuum of space experiences very little friction.
* Objects moving on perfectly smooth surfaces: In a hypothetical scenario with perfectly smooth surfaces, there would be no friction.
* Objects moving at very high speeds: At very high speeds, objects can experience a type of friction called drag, but it's primarily caused by the resistance of the medium they're moving through (like air or water) rather than direct contact with a surface.
Therefore, while friction is common in everyday experiences, it's not a universal force that applies to all moving objects.
