Surface tension is when water molecules stick together like they are holding hands. Surface tension is what makes falling raindrops round. Surface tension is a force. Surface tension causes the water in a bucket to curve down at the edges making the surface uneven.
When the needle was laid gently on the water, the water molecules “hand holding” was strong enough to hold up the needle. Their force was stronger than gravity trying to pull the needle down. The dent in the water around the needle was the struggle between gravity and surface tension.
When we belly flop in the swimming pool, it hurts. This is because our body has to break through a huge number of water molecules.
Forces in our activity: the weight of the needle, surface tension, gravity.
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