【Daily Question】Theoretical Foundation 2020.02.18
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Multiple-choice question: A cargo with a weight of W is carried downward by an elevator. When the elevator accelerates downward, moves at a constant speed downward, or decelerates downward, the pressures exerted by the cargo on the floor are R1, R2, and R3 respectively. What is the relationship between these values? ( ) Answer: C When the elevator accelerates downward, the pressure of the floor on the goods decreases, and thus the pressure R1 exerted by the goods on the floor also decreases. As the elevator slows down while descending, the pressure of the floor on the goods increases, and thus the pressure R3 exerted by the goods on the floor also increases. When descending at a constant speed, the force between the two is the intermediate value. Tip: An additional reward will be given to those who can explain the problem-solving process; the answers can be seen here!
C~ When the elevator accelerates downward, the pressure of the floor on the goods decreases, and accordingly, the pressure of the goods on the floor also decreases. As the elevator slows down and descends, the pressure of the floor on the goods increases, and consequently, the pressure of the goods on the floor also increases. In a constant-speed state, the interactive force is higher than that during deceleration, but lower than it is during acceleration~
C When the elevator accelerates downward, the pressure of the floor on the goods decreases, and thus the pressure R1 exerted by the goods on the floor also decreases. As the elevator slows down while descending, the pressure of the floor on the goods increases, and thus the pressure R3 exerted by the goods on the floor also increases. When descending at a constant speed, the force between the two is the intermediate value.