2014 AP Physics C物理C—Mechanics力学真题系列之Practice Exam简答题免费下载

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2014 AP Physics C Mechanics Practice Exam Free-Response Questions Free Download

2014 AP 物理C力学模考简答题部分免费下载

此套题仅 p II含有简答题，

共计时45分钟，共3题

占总分50%

每道大题可能含有不同数量的小题

可以使用计算器

部分真题预览：

1）Experiment 1: A block of mass 1.5kg is placed on a long board. You are to design an experiment to determine the coefficient of static friction between the block and the board.

1. 1. From the following list of available equipment, check those additional items you would use for the purpose of determining the coefficient of static friction.
      ____Ruler ____Spring scale ____String
      ____Meterstick ____Pulley ____Protractor
      ____Photogate ____Stopwatch ____Mass hanger
      ____Clamps and supports ____Objects of various known masses
   2. Sketch a diagram of your experimental setup and label the pieces of equipment that would be used.
   3. Outline the experimental procedure you would use, including a list of quantities you would measure.
      For each quantity, identify the equipment you would use to make the measurement.
2. Explain how to use the measurements described in part (a) to calculate the coefficient of static friction. Include a free-body diagram in your explanation that shows all forces (not components) acting on the block while the measurements are being made.
   Experiment 2: In a second experiment, the coefficient of kinetic friction between the block and the board is above the horizontal. The block is released determined to be 0.10. The board is now inclined at an angle of 25° from rest at the top of the incline and slides 2.0m down the incline.
3. Calculate the work done by kinetic friction as the block slides down the incline.
4. The mass of the block is now increased without changing the coefficient of kinetic friction, and experiment 2 is repeated. How does each of the following change?
   1. The magnitude of the frictional force
      ___Increases___Decreases___Remains the same
   2. The magnitude of the velocity of the block as it reaches the bottom of the incline
      ___Increases___Decreases___Remains the same
   3. The kinetic energy of the block at the bottom of the incline
      ___Increases___Decreases___Remains the same

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