下面是SAT2物理练习题，都是关于Work, Energy, and Power方面的。在SAT2物理考试中，这几个是最重要的知识点，需要大家在备考的过程中进行更加详细的准备。下面我们来看看这几道SAT2物理练习题的内容吧。

　　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 constantvelocity over a distance of 4m. The coficient of kinetic frictionbetween the box and the floor is0.3. How much work does the person doin 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 doin pulling a 10 kg box down a30º inclined plane of length 8.0 m? Notethat sin 30 = cos 60 = 0.500and 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

　　1. C

　　When the force is exerted in the direction of motion, work is simply the product of force and displacement. The work done is (10 N)(4.0 m) = 40 J.

　　2. D

　　Thework done on the box is the force exerted multiplied by the box’sdisplacement. Since the box travels at a constant velocity, we knowthat the net force acting on the box is zero. That means that the forceof the person’s push is equal and opposite to the force of friction.The force of friction is given by, whereis the coficient of kinetic friction and N is the normal force. The normal force is equal to the weight of the box, which is mg = (10 kg )(10 m/s2) = 100 N.

　　With all this in mind, we can solve for the work done on the box:

　　3. C

　　The work done bythe force of gravity is the dot product of the displacement of the boxand the force of gravity acting on the box. That means that we need tocalculate the component of the force of gravity that is parallel to theincline. This is mg sin 30 = (10 kg)(10 m/s2) sin 30. Thus, the work done is

　　4. C

　　This isthe same question as question 1. We were hoping that with differentnumbers and line spacing you wouldn’t notice. The test writers do thattoo sometimes.

　　以上就是这四道SAT2物理练习题的全部内容，后面附有详细的答案解析。大家在备考相关的SAT2物理考试知识点的时候，可以对上面的几道练习题目加以详细的分析，对于题目的设置方式和自己答题的思路进行梳理，更加有利于SAT2物理考试的备考。

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