Which observation would provide the strongest evidence that a machine is a fixed pulley?

Question

Which observation would provide the strongest evidence that a machine is a fixed pulley? — Exam MCQ

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C. The effort and load move in opposite directions. — A fixed pulley mainly changes the direction of the effort; ideally its mechanical advantage is 1, so the effort is not smaller than the load.

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A. The machine stores energy while lifting.

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B. The load becomes lighter during lifting.

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D. The applied force is smaller than the load.

Which observation would provide the strongest evidence that a machine is a fixed pulley?

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