Bloomfield+(2009)

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Gravity provides the energy source for a roller coaster and inertia is what keeps the roller coaster moving when the track is level or uphill.

If an object is stationary, it tends to remain station.

If an object was moving forward at a certain speed, it tends to keep moving forward at a certain speed.

The rightward "pull" isn't a true force; it's just the result of your own inertia trying to prevent you from accelerating.

Instead, that object's own inertia is trying to make it travel in a straight-line path that would cause it to drift farther and farther away from the center.

The one true force acting on the revolving object is an inward one-a centripetal force.

The object is trying to go straight and the centripetal force is pulling it inward and bending the object's path into a circle.