SAT考试是美国高中生进入美国大学的标准入学考试，包括SAT1和SAT2。SAT2是专项测验，有数学、物理、化学、生物、外语等，大部分为选择题，是可以选科的。今天我们来学习SATII物理专题分析 Practice Questions of Work, Energy, and Power，希望对大家的复习有所帮助。

　　1. How much work does a person do in pushing a box with a force of 10 N over a distance of 4.0 m in the direction of the force?

　　(A) 0.4 J

　　(B) 4.0 J

　　(C) 40 J

　　(D) 400 J

　　(E) 4000 J

　　2. A person pushes a 10 kg box at a constant velocity over a distance of 4 m. The coficient of kinetic friction between the box and the floor is 0.3. How much work does the person do in pushing the box?

　　(A) 12 J

　　(B) 40 J

　　(C) 75 J

　　(D) 120 J

　　(E) 400 J

　　3. How much work does the force of gravity do in pulling a 10 kg box down a 30º inclined plane of length 8.0 m? Note that sin 30 = cos 60 = 0.500 and cos 30 = sin 60 = 0.866.

　　(A) 40 J

　　(B) 69 J

　　(C) 400 J

　　(D) 690 J

　　(E) 800 J

　　4. How much work does a person do in pushing a box with a force of 20 N over a distance of 8.0 m in the direction of the force?

　　(A) 1.6 J

　　(B) 16 J

　　(C) 160 J

　　(D) 1600 J

　　(E) 16000 J

　　5. The figure below is a force vs. displacement graph, showing the amount of force applied to an object by three different people. Al applies force to the object for the first 4 m of its displacement, Betty applies force from the 4 m point to the 6 m point, and Chuck applies force from the 6 m point to the 8 m point. Which of the three does the most work on the object?

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