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A common answer to the riddle "What is round but does not roll?" is a coin. Coins are typically circular in shape but usually remain stationary when placed flat on a surface. Other possible answers could include a plate or a button, as they also have a round shape but do not roll.
If two round objects roll down a hill, the one with the greater mass will roll faster. If they are dropped they will fall at the same rate.
To allow it to roll and facilitate kicking A U. S. football is called a prolate spheroid.
A cylinder is a round object with two flat ends, like a paper towel roll. A sphere is completely round, like a ball.
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