Towrope exerts a force on a water skier who is towed behind speedboat. b.) Normal force pushes upware on Jean as she rides an escalator to a higher floor at the mall. c.) Gravitational force on bus directed downward as bus moves on horizontal road. d.) Block slides down an inclined plane, and normal force is perpendicular to the plane. e.) Battled baseball is slowed by gravitational force as it rises into air. f.) Frictional force slows a car as it skids to a stop. g.) Normal force pushes upward on a bicycle as it rides over horizontal ground. h.) Rock falls to the ground under influence of gravitational force.

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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!