Question 3When you stand and remain motionless on a bathroom scale, what force is the scale exerting on your feet?1 pointAn upward support force greater than your weight, to keep you from falling.An upward support force equal in amount to your weight.An upward support force less than your weight, to allow the scale to read your weight.Zero force, so that the scale can read your weight.
Question
Question 3When you stand and remain motionless on a bathroom scale, what force is the scale exerting on your feet?1 pointAn upward support force greater than your weight, to keep you from falling.An upward support force equal in amount to your weight.An upward support force less than your weight, to allow the scale to read your weight.Zero force, so that the scale can read your weight.
Solution
Para responder a esta pregunta, es importante entender cómo funciona una báscula de baño y las fuerzas involucradas cuando una persona está de pie sobre ella sin moverse.
- Cuando estás de pie y permaneces inmóvil sobre una báscula de baño, tu peso ejerce una fuerza hacia abajo debido a la gravedad.
- La báscula de baño, a su vez, ejerce una fuerza hacia arriba en tus pies. Esta fuerza se llama fuerza de soporte o fuerza normal.
- Para que permanezcas inmóvil y en equilibrio, la fuerza de soporte que la báscula ejerce debe ser igual a la fuerza de tu peso. Esto se debe a que, según la tercera ley de Newton, para cada acción hay una reacción igual y opuesta.
- Si la fuerza de soporte fuera mayor que tu peso, te empujaría hacia arriba, lo cual no ocurre cuando estás inmóvil sobre la báscula.
- Si la fuerza de soporte fuera menor que tu peso, te hundirías o caerías, lo cual tampoco ocurre en esta situación.
Por lo tanto, la respuesta correcta es:
Una fuerza de soporte hacia arriba igual a tu peso.
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