What Physics Teachers Get Wrong About Tides! Everything you’ve learned about tides is WRONG. We know that gravity affects the motion of all objects equally - so why are oceans the only bodies of water with tides? Join Gabe on this week’s episode of PBS Space Time as he sets the record straight on tidal force, gravitational differential and what role the moon actually plays in tides. Why don’t lakes have tides? Watch the episode to find out!