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. A block is placed on an elevator platform that moves downward with decreasing speed. Consider the time interval At, in which the speed of the platform changes from v, to zero.

. A block is placed on an elevator platform that moves downward with decreasing speed. Consider the time interval At, in which the speed of the platform changes from v, to zero.

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1 A block is placed on an elevator platform that moves downward with decreasing speed. Consider the time interval At, in which the speed of the platform changes from v, to zero. Decreasing speed (from v, to zero) Block a. In the space provided, sketch a free-body diagram for the block. b. Is the net work done on the block positive, negative, or zero? Platform For each force on the free-body diagram, state whether the work done on the block by that force is positive, negative, or zero. Explain. Free-body diagram for block Rank the works you identified above in order of decreasing absolute value. Explain. c. Consider reference frame R, moving downward with constant speed v.. In reference frame R: Direction of acceleration Direction of i. In the spaces provided, draw arrows to indicate the direction of the velocity and the acceleration of the block in reference frame R during the interval At,. Explain. velocity of block of block ii. In reference frame R: • is the block speeding up, slowing down, or moving with constant speed? (Base your answer on the directions of the velocity and acceleration). • is the change in kinetic energy of the block positive, negative, or zero? Explain. iii. The work-energy theorem can be applied in any inertial frame of reference. Apply the theorem to determine whether the net work done on the block is positive, negative, or zero in reference frame R. Explain.
Transcribed Image Text:1 A block is placed on an elevator platform that moves downward with decreasing speed. Consider the time interval At, in which the speed of the platform changes from v, to zero. Decreasing speed (from v, to zero) Block a. In the space provided, sketch a free-body diagram for the block. b. Is the net work done on the block positive, negative, or zero? Platform For each force on the free-body diagram, state whether the work done on the block by that force is positive, negative, or zero. Explain. Free-body diagram for block Rank the works you identified above in order of decreasing absolute value. Explain. c. Consider reference frame R, moving downward with constant speed v.. In reference frame R: Direction of acceleration Direction of i. In the spaces provided, draw arrows to indicate the direction of the velocity and the acceleration of the block in reference frame R during the interval At,. Explain. velocity of block of block ii. In reference frame R: • is the block speeding up, slowing down, or moving with constant speed? (Base your answer on the directions of the velocity and acceleration). • is the change in kinetic energy of the block positive, negative, or zero? Explain. iii. The work-energy theorem can be applied in any inertial frame of reference. Apply the theorem to determine whether the net work done on the block is positive, negative, or zero in reference frame R. Explain.
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