I love the fair. My favorite thing to do is ride roller coasters.
My favorite roller coaster have clothoid loops, an upside down teardrop. This means the loop has a smaller radius at the top than the bottom, making the rider feel lighter at the top and heavier at the bottom. I especially enjoy it when the ride is upside down and even going backwards. Feeling the force (gravity) holding you in the car when you should be falling out is exciting.
The centripetal acceleration and centripetal force generated on a roller coaster are high. This force that is directed towards the center is what makes riders feel a sense of weightlessness. The more weightlessness a rider feels the more memorable the ride.
Going through a horizontal roller coaster loop, the tracks push against the car, and by extension your bottom, to keep you going in a circle. Your body pushes back, according to Newton's 1st and 3rd Laws. The force of your body pushing back is what keeps you in your seat.
The tangential velocity of the roller coaster is the speed of the ride as ts moves in the loops. The loops can have different size circumferences, distance around the circle.
Even at the fair while riding rides and having fun, physics is at work all around us.
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