Traditional Culture Encyclopedia - Traditional virtues - What are overweight and weightlessness? What is the difference? How to distinguish?
What are overweight and weightlessness? What is the difference? How to distinguish?
The acceleration of the elevator and the acceleration of gravity are in the same direction, and it is either zero or weightless.
The difference is, take the people in the elevator as an example:
When people are overweight, the supporting force is F 1, then F 1=M(g+a), and the supporting force increases. If you put a scale under people's feet, the indicator will get bigger. That is to say, the weight has increased, so it is called overweight.
When people are supported by F2 in weightlessness, F2=M(g-a), and the supporting force decreases. The indicator of the ruler will become smaller. Weight is reduced, so it is called weightlessness.
For example, when the elevator decelerates upward and accelerates downward, the acceleration is positive and the direction is the same as the gravity acceleration. At this point, it is in weightlessness.
When the elevator accelerates upward and decelerates downward, the acceleration is negative, and the direction is opposite to that of gravity acceleration. It's overweight now.
It can be seen that overweight and weightlessness are very easy to distinguish That is, the acceleration of the system where the object is located is opposite to the acceleration of gravity, which increases the supporting force of the object and is overweight. On the contrary, there is weightlessness. Judging whether the acceleration direction of the system is the same as that of gravity acceleration is the key to distinguish overweight from weightlessness.
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