五道SAT2物理练习题(关于力).

　　下面为大家搜集整理了五道SAT2物理练习题，供大家参考。SAT2物理考试中有很多的知识点都需要大家在备考的时候用更多的精力来练习，因为这些内容虽然在知识本质上大家学习过，但是在表达的方式和解题的思路上还是需要调整。下面我们来看详细内容吧。

　　1. 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

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

　　(A)Al

　　(B)Betty

　　(C)Chuck

　　(D)Al and Chuck do the same amount of work

　　(E)Betty and Chuck do the same amount of work

　　3. When a car’s speed doubles, what happens to its kinetic energy?

　　(A)It is quartered

　　(B)It is halved

　　(C)It is unchanged

　　(D)It is doubled

　　(E)It is quadrupled

　　4. A worker does 500 J of work on a 10 kgbox. If the box transfers 375 Jof heat to the floor through thriction between the box and the floor,what is the velocity of the boxafter the work has been done on it?

　　(A)5 m/s

　　(B)10 m/s

　　(C)12.5 m/s

　　(D)50 m/s

　　(E)100 m/s

　　5. A person on the street wants to throw an 8kg book up to a personleaning out of a window 5 m above street level.With what velocity mustthe person throw the book so that it reachesthe person in the window?

　　(A)5 m/s

　　(B)8 m/s

　　(C)10 m/s

　　(D)40 m/s

　　(E)50 m/s

　　1. 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.

　　2. C

　　a force vs. displacement graph, the amount of work done is the area between the graph and the x-axis. The work Al does is the area of theright triangle:

　　The amount of work Betty does is equal to the area of a triangle of length 2 and height 4:

　　The amount of work done by Chuck is equal to the area of a rectangle of length 2 and height 4:J. We can conclude that Chuck did the most work.

　　Don’t be fooled by D: the force exerted by Al is in the opposite direction of the object’s displacement, so he does negative work on the object.

　　3. E

　　The formula for kinetic energy is KE =mv2.Since the car’s kinetic energy is directly proportional to the squareof its velocity, doubling the velocity would mean quadrupling itskinetic energy.

　　4. A

　　The work-energy theorem tells us that the amount of work done on an objectis equal to the amount of kinetic energy it gains, and the amount ofwork done by an object is equal to the amount of kinetic energy itloses. The box gains 500 J of kinetic energy from the worker’s push,and loses 375 J of kinetic energy to friction, for a net gain of 125 J.Kinetic energy is related to velocity by the formula KE =mv2, so we can get the answer by plugging numbers into this formula and solving for v:　　

　　5. C

　　When the book reaches the person in the window, it will have a gravitational potential energy of U = mgh.In order for the book to reach the window, then, it must leave thehands of the person at street level with at least that much kineticenergy. Kinetic energy is given by the formula KE = 1/2 mv2, so we can solve for v by making KE = U:　　

　　以上就是这2五道SAT2物理练习题的全部内容，都是关于力的部分，题目后面附有详细的答案。大家在备考关于这个部分的SAT2物理知识点的时候，一定要根据自己的备考情况对这些题目进行练习和掌握。

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