In Figure 1, for instance, you can see the indentations in the water surface made by the feet of an insect known as a water strider, because it can stride or walk on the surface just as a person can walk on a trampoline. The surface of the water behaves in a similar way. ![]() ![]() This upward force balances the person's weight. When a person stands on a trampoline, the trampoline stretches downward a bit and, in so doing, exerts an upward elastic force on the person. Surface tension is a property that allows the surface of a liquid to behave somewhat as a trampoline does. Instead, the force balancing a leaf's weight arises because of the surface tension of the water. They are not immersed in the water, so the weight of a leaf is not balanced by a buoyant force. The leaves, however, float for a different reason. ![]() The boat floats, because it is partially immersed in the water and the resulting buoyant force balances its weight, as Section 11.6 discusses. In the fall a fisherman's boat is often surrounded by fallen leaves that are lying on the water.
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