What are the forces acting on the rollercoaster at the bottom of the hill?

Neglecting friction and air resistance, a roller coaster car will experience two forces: the force of gravity (Fgrav) and the normal force (Fnorm). The normal force is directed in a direction perpendicular to the track and the gravitational force is always directed downwards.



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Potential and kinetic energy can be exchanged for one another, so at certain points the cars of a roller coaster may have just potential energy (at the top of the first hill), just kinetic energy (at the lowest point) or some combination of kinetic and potential energy (at all other points).

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In a roller coaster loop, riders are pushed inwards toward the center of the loop by forces resulting from the car seat (at the loop's bottom) and by gravity (at the loop's top). Energy comes in many forms. The two most important forms for amusement park rides are kinetic energy and potential energy.

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On top of a hill The only forces acting on the rider are the upward normal force n exerted by the car and the downward force of gravity w, the rider's weight.

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Gravity always pulls downward with the same strength, and, in the case of a roller coaster, it pulls downward on the cars wherever they are on the track. Near the bottom of a loop, gravity pulls in a direction away from the center of the loop circle.

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As the cars ascend the next hill, some kinetic energy is transformed back into potential energy. Then, when the cars descend this hill, potential energy is again changed to kinetic energy. This conversion between potential and kinetic energy continues throughout the ride.

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While going down the hill, the roller coaster picks up more and more speed. The potential energy the cart had at the top of the hill transforms into kinetic energy at the bottom of the hill. Because you are moving so fast, you have a very high kinetic energy, and a very low potential energy.

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At the bottom of the loop, gravity and the change in direction of the passenger's inertia from a downward vertical direction to one that is horizontal push the passenger into the seat, causing the passenger to once again feel very heavy.

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The higher the hill, the greater the potential or stored energy of the roller coaster car. When the car reaches the bottom of the hill, the potential energy has been completely converted into kinetic energy which is the energy of motion.

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While moving uphill or in a straight line, it may decrease in velocity or decelerate. The force of gravity pulling a roller coaster down hill causes the roller coaster to go faster and faster, it is accelerating.

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Friction is a force that opposes (goes against or opposite to) the motion of an object. If the roller coaster cars are moving to the east, the force of friction is to the west. The force of friction acts on the moving cars, decreasing the total amount of mechanical energy in the roller coaster.

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