The stress analysis shows that there is no essential difference between tiptoe and non-tiptoe. In detail, the action of standing on tiptoe does give the scale a downward thrust, which is also the reason why the scale pointer will shake. But when it comes to rest, the relationship between forces is like this. The scale has a supporting force on your body (the stress point is the corner tip) to offset the gravity you receive, and the gravity you receive is transmitted to the scale through your toes.
In more detail, take the upright position as an example (standing sideways is essentially the same, but the center of gravity is off, which wastes your breath and is unnecessary), and take the ankle as the turning point. When the sole of the foot touches the ground, the weight above the ankle is directly transferred to the scale through the heel, and the weight from the ankle to the toe directly contacts the scale and is also transferred to the scale. At this time, of course, you are weighing your total weight. But after tiptoeing, the weight above the ankle must pass through the ankle to the toes and then to the scale. Of course, the ankle joint will exert force, which is equal to the weight above the ankle joint. At this time, add the weight from ankle to toe, and you actually get your actual weight. From this analysis, it can be seen that the force on the ankle is only because the upper body has pressure on the ankle, and the reaction force exerted on the upper body in order to offset this pressure. If you don't stand on tiptoe, this part of the force is directly transmitted to the scale through the heel. It's just a different route
Force analysis must find out every force, make clear the meaning of each force, and don't include two forces with repeated functions for repeated calculation.
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