2008 AP Physics C物理C—Mechanics力學(xué)真題系列之簡(jiǎn)答題免費(fèi)下載

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2008 AP Physics C Mechanics Free-Response Questions Free Download

2008 AP 物理C力學(xué)簡(jiǎn)答題部分免費(fèi)下載

此套題僅?p II含有簡(jiǎn)答題，

共計(jì)時(shí)45分鐘，共3題

占總分50%

每道大題可能含有不同數(shù)量的小題

可以使用計(jì)算器

部分真題預(yù)覽：

1）A skier of mass M is skiing down a frictionless hill that makes an angle θ with the horizontal, as shown in the diagram. The skier starts from rest at time t = 0 and is subject to a velocity-dependent drag force due to air resistance of the form F = -bv, where v is the velocity of the skier and b is a positive constant. Express all algebraic answers in terms of M, b, θ , and fundamental constants.

1. On the dot below that represents the skier, draw a free-body diagram indicating and labeling all of the forces that act on the skier while the skier descends the hill.
2. Write a differential equation that can be used to solve for the velocity of the skier as a function of time.
3. Determine an expression for the terminal velocity v_T of the skier.
4. Solve the differential equation in part (b) to determine the velocity of the skier as a function of time, showing all your steps.
5. On the axes below, sketch a graph of the acceleration a of the skier as a function of time t, and indicate the initial value of a. Take downhill as positive.