What keeps rollercoasters at a continuous speed throughout the ride so that it’s able to complete twists, turns and loops?
In: Engineering
In a nutshell, momentum.
Everything on a coaster, all its twists, turns and weight, have been calculated to be able to get past the opposing forces through momentum alone.
This is why there’s a lift hill as the first thing on most coaster setups.
Of course, there are things like acceleration on tracks that help propel the coaster forward that uses things like wheels or even electromagnets.
Here is a very good youtube channel, Amusement Labs, that actually teaches the tech behind these things.
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