2015 AP Physics C物理C—Mechanics力學真題系列之簡答題免費下載

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真題與答案下載

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2015 AP Physics C Mechanics Free-Response Questions Free Download

2015 AP 物理C力學簡答題部分免費下載

此套題僅?p II含有簡答題，

共計時45分鐘，共3題

占總分50%

每道大題可能含有不同數量的小題

可以使用計算器

部分真題預覽：

1）A block of mass m is projected up from the bottom of an inclined ramp with an initial velocity of magnitude v₀. The ramp has negligible friction and makes an angle θ with the horizontal. A motion sensor aimed down the ramp is mounted at the top of the incline so that the positive direction is down the ramp. The block starts a distance D from the motion sensor, as shown above. The block slides partway up the ramp, stops before reaching the sensor, and then slides back down.

1. Consider the motion of the block at some time t after it has been projected up the ramp. Express your answers in terms of m, D, v₀, t, θ and physical constants, as appropriate.
   1. Determine the acceleration a of the block.
   2. Determine an expression for the velocity v of the block.
   3. Determine an expression for the position x of the block.
2. Derive an expression for the position x_min?of the block when it is closest to the motion sensor. Express your answer in terms of m, D, v₀, θ, and physical constants, as appropriate.
3. On the axes provided below, sketch graphs of position x, velocity v, and acceleration a as functions of time t for the motion of the block while it goes up and back down the ramp. Explicitly label any intercepts, asymptotes, maxima, or minima with numerical values or algebraic expressions, as appropriate.
4. After the block slides back down and leaves the bottom of the ramp, it slides on a horizontal surface with a coefficient of friction given by μ_k. Derive an expression for the distance the block slides before stopping. Express your answer in terms of m, D, v₀, θ,μ_k?and physical constants, as appropriate.
5. Suppose the ramp now has friction. The same block is projected up with the same initial speed?v_0?and comes back down the ramp. On the axes provided below, sketch a graph of the velocity v as a function of time t for the motion of the block while it goes up and back down the ramp, arriving at the bottom of the ramp at time t_?. Explicitly label any intercepts, asymptotes, maxima, or minima with numerical values or algebraic expressions, as appropriate.

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