Which ituation with or without friction i more imilar to your everyday experience on a kateboard or bicycle?
Skateboarders move more quickly and more slowly depending on the gravitational field around them.
Skateboarders go more slowly and more quickly depending on the amount of friction they encounter. The skater initially has no kinetic energy, only potential energy. The skater had used all of the energy that she will ever have. Since the track is frictionless, no energy is converted to thermal energy throughout the route from point A to point B. The skater has greater potential energy the higher he is. His kinetic energy increases and his potential energy falls as his height decreases. Ice skating is a good illustration of sliding friction.
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Physics, published 10.03.2023