# 2014 AP Physics 1物理Algebra-Based真题系列之Practice Exam选择题免费下载

### 2014 AP 物理1模考选择题部分免费下载

#### 部分真题预览：

15）When two charged, massive objects are placed a distance r apart, the gravitational force between them has magnitude F. When the distance between the objects is increased to 2r, the magnitude of the gravitational force between them becomes F/4 . Did the electrostatic force between the objects also decrease to one fourth its initial magnitude as a result of the change in position, and why?

1. No, because the gravitational constant is much smaller than the electrostatic constant.
2. No, because the gravitational force is only attractive, and the electrostatic force can also be repulsive.
3. Yes, because both forces have the same 1/r2 dependence.
4. Yes, because the gravitational force always equals the electrostatic force at any given distance.

24）While the object is continuously oscillating, the student determines the maximum speed of the object during two oscillations. The first speed is 3.5 m/s and the second speed is 2.7 m/s . Which of the following could account for the decrease in the object’s maximum kinetic energy?

1. Energy was transferred from the object to the spring, which increased the maximum potential energy of the spring.
2. Energy was transferred from the spring to the object, which decreased the maximum potential energy of the spring.
3. As energy was transferred back and forth between the object and the spring, a greater average share of the energy became potential energy of the spring.
4. The object-spring system lost energy to its surroundings.

29）Alan and Beverly are on opposite sides of a large room when Alan says something to Beverly. Beverly does not hear him, so Alan repeats the message louder and Beverly now hears it. Which of the following could be different about the second sound wave compared to the first that allows Beverly to hear it?

1. The second wave travels to Beverly more quickly, so less energy is dissipated by the time the wave reaches her.
2. The second wave reflects more off the walls of the room.
3. The air molecules disturbed by the second wave undergo a greater displacement from their equilibrium positions.
4. The air molecules disturbed by the second wave are, on average, more closely spaced.