As Shown in the Figure, a Woman Is Straining to Lift

question 42

Multiple Choice

As shown in the figure, a woman is straining to lift a large crate, but without success because it is too heavy. We denote the forces on the crate as follows: P is the magnitude of the upward force being exerted on the crate by the person, C is the magnitude of the vertical contact force on the crate by the floor, and W is the weight of the crate. How are the magnitudes of these forces related while the person is trying unsuccessfully to lift the crate?

• A)P + C = W
• B)P + C < W
• C)P + C > W
• D)P = C

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