How does a centrifuge make an astronaut feel heavier? A. The centrifuge increases the force of gravity on the astronaut. B. The centrifuge provides an increased normal force that feels like a larger force of gravity. C. The centrifuge exerts a force on the astronaut away from the centre of rotation. D. The centrifuge spins more rapidly than Earth, creating a stronger force of gravity.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!