If the angle of inclination of the right-side plane is gradually decreased, the marble will climb up to a lesser height compared to its initial height on the left side, because it will travel a longer horizontal distance before coming to rest.
What effect does gradually decreasing the angle of inclination of the right-side plane have on the marble’s motion?
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Gradually decreasing the angle of inclination of the right-side plane reduces the vertical component of the marble’s gravitational force. This decreases its potential energy converted into kinetic energy, causing the marble to travel a longer horizontal distance before friction and air resistance eventually bring it to a stop.