Spool Wheel on Incline (1Q20.30)
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A large spool with a small hub rolls down an incline on the hub. When it nears the bottom of the incline the large outer discs touch down and the wheel rolls on the discs instead of the hub. Since points on the edge of the outer discs have a much greater translational velocity than points on the hub, the wheel as a whole gains translational velocity. To compensate, it loses angular velocity.
Use the right angle bracket to ensure that the spool wheel will roll straight down the ramp. Center the spool so that the side discs do not rub against the ramp.
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The side discs make contact before the wheel reaches the end of the ramp:
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