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Physics - Please explain 10c) why total energy decreases. Shouldn't it remain the same since energy cannot be created or destroyed? I would think that it's just that more KE gets converted into Heat energy, but total energy still remains the same
Date Posted: 5 years ago
Views: 284
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Going by your logic, then why did you say it increases instead of being unchanged?
Hi Vivian, You are absolutely right. Total energy should remain the same.
What has decreased is the total (KE + GPE), which is called the "Mechanical Energy".
So the question is not clear, if it expects an answer to be "decreased".
What has decreased is the total (KE + GPE), which is called the "Mechanical Energy".
So the question is not clear, if it expects an answer to be "decreased".
I also like to say something about the question part (b) and your answer to that, even though your answer was marked correct.
If the question "the height at B" is referring to the "height" as shown in the diagram, which is the height of B with respect to A, then the value of "GPE" you use in your calculation should be the gain in GPE of 30J and not 100J. :)
If the question "the height at B" is referring to the "height" as shown in the diagram, which is the height of B with respect to A, then the value of "GPE" you use in your calculation should be the gain in GPE of 30J and not 100J. :)
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