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When is mechanical energy conserved? (To remind you, mechanical energy is the sum of kinetic energy and all forms of potential energy. In each of the following situations, the initial and final moments to be compared will be specified. Additionally, what constitutes the "system" will be specified in each case. I'm not trying to trick you; the standard/reasonable choice of system will be made in each case; it's just important that it be stated clearly in order to answer the question. Ignore air resistance in all cases. Multiple answers can be selected.)

When is mechanical energy conserved? (To remind you, mechanical energy is the sum of kinetic energy and all forms of potential energy. In each of the following situations, the initial and final moments to be compared will be specified. Additionally, what constitutes the "system" will be specified in each case. I'm not trying to trick you; the standard/reasonable choice of system will be made in each case; it's just important that it be stated clearly in order to answer the question. Ignore air resistance in all cases. Multiple answers can be selected.)

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Question 2 When is mechanical energy conserved? (To remind you, mechanical energy is the sum of kinetic energy and all forms of potential energy. In each of the following situations, the initial and final moments to be compared will be specified. Additionally, what constitutes the "system" will be specified in each case. I'm not trying to trick you; the standard/reasonable choice of system will be made in each case; it's just important that it be stated clearly in order to answer the question. Ignore air resistance in all cases. Multiple answers can be selected.) A firework explodes into six pieces. (The initial moment is right before the explosion and the final moment is right after the explosion. The system is the firework.) D A piece of chalk is in free fall. (You can choose any two moments during the free fall motion to compare. The system is the piece of cholk.) A box collides with a spring on a horizontal frictionless surface. (The initial moment is some time before the box collides with the spring and the final moment is some time when the box and the spring are in contact. The system is the box and the spring.) OA skler glides down a snowy slope at constant speed. (You can choose any two moments during the gliding motion to compare. The system is the skier.)
Transcribed Image Text:Question 2 When is mechanical energy conserved? (To remind you, mechanical energy is the sum of kinetic energy and all forms of potential energy. In each of the following situations, the initial and final moments to be compared will be specified. Additionally, what constitutes the "system" will be specified in each case. I'm not trying to trick you; the standard/reasonable choice of system will be made in each case; it's just important that it be stated clearly in order to answer the question. Ignore air resistance in all cases. Multiple answers can be selected.) A firework explodes into six pieces. (The initial moment is right before the explosion and the final moment is right after the explosion. The system is the firework.) D A piece of chalk is in free fall. (You can choose any two moments during the free fall motion to compare. The system is the piece of cholk.) A box collides with a spring on a horizontal frictionless surface. (The initial moment is some time before the box collides with the spring and the final moment is some time when the box and the spring are in contact. The system is the box and the spring.) OA skler glides down a snowy slope at constant speed. (You can choose any two moments during the gliding motion to compare. The system is the skier.)
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