Forces, Newton's Laws, and Momentum — Test

Question 10 • Physics

Which shows the correct free body diagram of the hanging picture?

Answer

Image with description A free body diagram with two force vectors, the first pointing downward labeled F Subscript p Baseline, the second pointing upward labeled F Subscript T Baseline.

Image with description A free body diagram with three force vectors, the first pointing south labeled F Subscript g Baseline, the second pointing northeast labeled F Subscript T Baseline and the third pointing northwest labeled F Subscript T.

Image with description A free body diagram with three force vectors, the first pointing south labeled F Subscript p Baseline, the second pointing northeast labeled F Subscript T Baseline, and the third pointing northwest labeled F Subscript N.

Image with description A free body diagram with two force vectors, the first pointing downward labeled F Subscript g Baseline, the second pointing upward labeled F Subscript N Baseline.

Explanation

The picture’s weight acts downward, so the diagram needs a downward gravitational force, Fg. The two supporting strings each pull along their length, giving two tension forces directed upward and outward. Choice B shows all three forces; a normal force is not present because the strings, rather than a surface, support the picture.

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