State the sign and charge of the ball as it moves upwards. Explain Why the ball moves upwards. The ball discharges when it hits the lids. Explain how the ball loses its charge. The ball continues to move up and down between the charged plate and Lid. Explain why the ball continues to move up and down.
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Surface tension
"The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules." It seems to defy the laws of physics, but a paper clip made of steel can indeed float on the water surface.
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