6. Intro to Forces (Dynamics)

Forces in Connected Systems of Objects

Multiple Choice
The three ropes shown in the figure are tied to a steel ring. Two of the ropes are anchored to walls at right angles, and the third rope pulls as shown. If the tension in rope 2 is $110 N$ , what is the mass of the steel ring?
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Multiple Choice
Three blocks are placed in line on a frictionless table with block B in between blocks A and C. Block A has a mass of $2.0 kg$ , block B has a mass of $4.0 kg$ , and block C has a mass of $6.0 kg$ . A student pushes horizontally on block A with a force of $24 N$ . What is the magnitude of the force of block B on block C?
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Multiple Choice
The coefficient of kinetic friction for block A in the figure is 0.2 and the pulley is frictionless. If the mass of block A is $2 kg$ , what is the magnitude of its acceleration?
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Multiple Choice
A toy train consists of an engine, followed by a boxcar, followed by a caboose. All have mass m. When the engine's wheels provide a force F in the forward direction, the train has acceleration a. What is the magnitude of the force of the boxcar on the caboose? Ignore any frictional effects.
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Textbook Question
A 75-kg petty thief wants to escape from a third-story jail window. Unfortunately, a makeshift rope made of sheets tied together can support a mass of only 62 kg. How might the thief use this 'rope' to escape? Give a quantitative answer.
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Textbook Question
A window washer pulls herself upward using the bucket–pulley apparatus shown in Fig. 4–40. If she increases this force by 15%, what will her acceleration be? The mass of the person plus the bucket is 78 kg.
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