Station 6 consists of two models. The first model is a spring scale attached to a string by the hook on top of the spring scale. The force that the spring scale is measuring is 0. Gravity is keeping the spring scale down, while the tension force of the string is keeping it up. The scale is at rest. The second model is a spring scale attached upside down so that the hook where the mass is usually put on is facing up instead of down. The force of gravity is pushing model two down. Keeping it up is a tension force of rope to hook. There is also a small elastic force expanding because of the spring scale and that is pushing the spring scale down.
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