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Ejemplos con grúas y ascensores pueden resultar atractivos. Conviene además mostrar que en estos casos el trabajo realizado por o contra la fuerza de gravedad es T = ± mgh, en que h es el desplazamiento vertical o altura. 54 Educación Media de Adultos Ciencias Naturales Ministerio de Educación Actividad 3 La energía mecánica y su conservación. El profesor o profesora define la energía en los siguientes términos: un sistema físico posee energía si tiene la capacidad para realizar trabajo mecánico.

Si la distancia entre las dos ciudades es de 120 kilómetros: • ¿Cuál fue la rapidez media del automóvil? • ¿A qué distancia de Santiago se encontraba el automóvil a las 10:30 horas? 32 Educación Media de Adultos Ciencias Naturales Ministerio de Educación km . Si la distancia del Sol a la Tierra es de 150 millones de kilómetros, h ¿cuánto tarda la luz del Sol en llegar hasta la Tierra? 2. 000 m 3. Un vehículo que viaja en línea recta posee en cierto instante una rapidez de 35 . Si frena s m uniformemente a razón de 5 2 , ¿qué tiempo transcurre desde que el chofer pisa el freno s hasta que el vehículo se detiene?

Para el concepto de trabajo (newton · metro = joule) y propone algunos ejemplos basados en acciones comunes para familiarizar a las personas del curso con el concepto. Por ejemplo, se puede proponer calcular, en una situación como la que ilustra el esquema siguiente, el trabajo que realiza la fuerza: a. Aplicada por la persona, quien traslada un mueble por el suelo una distancia de 5 m en la misma dirección y sentido en que aplica la fuerza de 100 newton. b. De roce, suponiendo que el movimiento es uniforme.

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