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Question
what does the law of conservation of energy tell us?
an object always has the same total amount of energy.
energy can be destroyed but not created.
energy can be created but not destroyed.
energy cannot be created or destroyed.
pregunta 2
in this image of a pendulum, where is the lowest potential energy found?
a
c
b
a
b
c
a and c
First Question (Law of Conservation of Energy)
La ley de conservación de la energía establece que la energía no puede ser creada ni destruida, solo transformada. Analicemos las opciones:
- "An object always has the same total amount of energy": Incorrecto, la energía total del sistema (no del objeto) se conserva.
- "Energy can be destroyed but not created": Incorrecto, la energía no se destruye.
- "Energy can be created but not destroyed": Incorrecto, la energía no se crea.
- "Energy cannot be created or destroyed": Correcto, coincide con la ley.
La energía potencial gravitatoria depende de la altura ($PE = mgh$). En el péndulo, la altura más baja es en la posición B (la masa está más cerca del suelo). En A y C, la masa está a mayor altura, por lo que tienen más energía potencial.
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Energy cannot be created or destroyed.