Newton’s law of motion - 无忧得胜-网上国际课程 (5edu.win)

?作业考试练习?美国物理杯赛(Physics Bowl)?Newton’s law of motion

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习题练习：Newton’s law of motion

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作者: admin 发布日期: 2024-07-30 13:02 总分: 43分得分: _____________

答题人: 游客未登录开始时间: 24年07月28日 14:39 切换到: 整卷模式

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.36: What happens to the inertia of an object when its velocity is d5+ga; jt.bu yooubled?

A. the object’s inertia becomes 2times greater

B. the object’s inertia becomes 2 times greater

C. the object’s inertia becomes 4 times greater

D. the object’s inertia becomes 8 times greater

E. the object’s inertia is unchanged

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.14: An intrinsic wv-5tfk u u4u3*u )k/nw/0jzin3ulp g property of matter is one that does not depend on the quantity of matter present./3uvwgk/5unuj-n 0tukl *pw if)3u4z Which of the following properties is NOT an intrinsic property?

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.16: A 20 kg boulder rests on the surface of the Earth 8 yh1k u00mo i2kb,gfq1ld-mk. Assume the Earth has mass20d, iu bmk0-ylm1k oghf k8q1 $5.98 \times 10^{24} \; kg$ and $g = 10\;m/s^{2}$ . What is the magnitude of the gravitational force that the boulder exerts on the Earth?

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

09.12: A 5.0 kg sphere is in free fall ne(41n) xvzus* -wtuo 3 agmz+wfar the surface of the Earth. What is the magnitude of the gravitational force acting on the earth by the sphere? The Earth mass is 4*gzoz)tvf1 wau mw-n3 +us(x $5.98 \times 10^{24} \; kg$ .

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.09: Is it possible for an object’s /d02abqkj /hrvelocity to increase while its accelerationajd/ kb0/h2q r decreases?

A. No, this is impossible because of the way in which acceleration is defined.

B. No, because if acceleration is decreasing the object will be slowing down.

C. No, because velocity and acceleration must always be in the same direction.

D. Yes, an example would be a falling object near the surface of the moon.

E. Yes, an example would be a falling object in the presence of air resistance.

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.11: A certain particle undergoes erratic motion. At ev5rhyx s9 x66doiebbb 2)w( sr6ery point in its motion, the direction of the particlyr6h6sbsbeix9 ro)6 w 5(b x2de’s momentum is ALWAYS

A. the same as the direction of its velocity

B. the same as the direction of its acceleration

C. the same as the direction of its net force

D. the same as the direction of its kinetic energy vector

E. none of the above

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.14: A block is sus dpyckc8 vdu/j l uz72:qtzjoso;*2/9pended in the air at the end of a string held by a person. The person pulls on the string uniformly accelerating the block upward for a short time. Durinz c/qu*/;ko 72cj dsoyu tvd:zpjl 829g this time, which one of the following choices correctly identifies the Newton’s Third Law pair force to the force of the string on the block?

A. the gravitational force from the Earth on the block

B. the force from the string on the person

C. the force from the person on the string

D. the force from the block on the string

E. the force from the person on the block

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.18: In which one of the following situations is te9k9i)n u,sc)(etb jnxclo1b g4xa 26he net force constantly zero on b9 oea1(n,g6c)4 i nxucxls2)bjek9tthe object?

A. A mass attached to a string and swinging like a pendulum.

B. A stone falling freely in a gravitational field.

C. An astronaut floating in the International Space Station.

D. A snowboarder riding down a steep hill.

E. A skydiver who has reached terminal velocity.

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

13.28: An object is in free fall close to th q,waq7, jysjiax6a /)e ground. A person intervenes and slows the object uniformly to rest. Which one of the following statements must be true about the magnitude of the acceleration of the object as it is being stopped by the person? The magnitude of the object’s acceleration is a i/ )s ayx,6jqa7,jq awand the magnitude of the acceleration from gravity is g.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.03: An object in equilibrium has three forces, F1 of 36k+j w3+1ojyebwu0sh0 N, F2 of 50 N, and F3 of 70 N, acting on it. The magnitude of the resultantj0e 3 6+jos1y+wubhk w ofF1 and F2 is

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

01.07: A force of 6 Newtons and a force ofuv61n +s d+odu 10 newtons can be combine to form a resultant with a mad s+no+16vudugnitude of which of the following

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

10.06: Which of the following statements il7 ;dodinie4 il7mx(smee7qr/ lwke o*10r7:s most closely associated with Newton’s Tho4dixr:eq*1semo7 7erl/7l7m0kl ( de;in i wird Law of Motion?

A. “What goes up must come down.”

B. “For every action force, there is an equal but opposite reaction force.”

C. “An object at rest remains at rest.”

D. “The acceleration of an object is directly proportional to the force acting on the object but inversely proportional to the mass of the object.”

E. “The Universe tends toward disorder.”

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

95.06: The reaction tuqz25sm /u.yforce does not cancel the action force because:

A. The action force is greater than the reaction force.

B. The action force is less than the reaction force.

C. They act on different bodies.

D. They are in the same direction.

E. The reaction exists only after the action force is removed.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

14.14: A box rests on the floor of an elevfqt;o69o7 nec2ve 2sk:vvm/f 8mx: utator. The elevator is accelerating upward. Which one of the following choices best represents the Newton’s Third La7x 2k8 v o::s9et/fot2qfevvu; mnc6m w pair force to the gravitational force acting on the box by the Earth?

A. There is no Newton’s Third Law pair force in this scenario.

B. The entire normal force of contact from the floor on the box.

C. Only a portion of the normal force of contact from the floor on the box.

D. The force of the cables pulling upward on the elevator.

E. The gravitational force acting on the Earth by the box.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

15.15: A skydiver falls downward through the air with constant speed. Whica moj/83l n jy*-pol5eh one of the following cajjn -8 m*/p lloo3y5ehoices correctly describes the Newton’s Third Law pair force to the air resistance acting on the skydiver during the fall?

A. There is no Third Law pair force for this kind of situation.

B. The gravitational force acting on the skydiver by the Earth

C. The force that molecules in the air exert on neighboring molecules in the air.

D. The force exerted on molecules in the air by the ground.

E. The force exerted on molecules in the air by the skydiver.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.08: A baseball is thrown by a pitcher with a speed of 35 m/s. The batter ; )xucu.rh6ptswingsuc h6tr);.u px and hits the ball. The magnitude of the force that the ball exerts on the bat is always

A. zero as it is only the bat that exerts a force on the ball.

B. equal to the gravitational force acting on the ball.

C. larger than the force the bat exerts on the ball.

D. smaller than the force the bat exerts on the ball.

E. equal to the force that the bat exerts on the ball.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

11.13: A physics book sits at rest on a table. On top of 3b7 z aosqk1jkb,u(3zthe book is a calculator, also at rest. Which one of the following choices is the Newton’s Third Law pair force to the force that the table exeruq3 3a, bz1(bk zoj7ksts on the book?

A. The contact force on the table by the book.

B. The gravitational force on the book by the Earth.

C. The gravitational force on the combination of the book and calculator by the Earth.

D. The contact force on the book by the calculator.

E. The contact force on the table by the ground supporting it.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.06: The students in a Physics I c29.4jmcsj ga ilass were in lab conducting an experiment related to Newton's Sec j9acigs.2jm 4ond Law. The collected data were displayed on the graph at the right. From this graph, what conclusions can the students make?

A. The mass of the system was constant.

B. The acceleration of the system was constant.

C. The force acting on the system was constant.

D. The force acting on the system is not related to the acceleration of the system.

E. The force acting on any system will always be less than 20 N.

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.03: If the net force on anvs6w7 :to-y yg object were doubled while at the same time the mass of the object was halved,then the acceleration :6yy vogw7s t-of the object is

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.15: A car whose mass is 1500 kg is accelerated uniformly from res6 v0s;yw /j1ief,3 (bgyoq3fm1zzjhj t to a speed of 20 m/s in 10s. The magnitude of the net force acce;3b0yfo m/ syjz61i,w jjg1vqh3f e z(lerating the car is:

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.05: A tractor-trailer truck is traveling down the road. The massiuwhg*sk52m 1y sy /8j of the trailer is 4 times the mass of the tractor. If the tractor accelerates forward, the force that the trailer applies on the tractor isj wih sk28/y*51ugyms

A. 4 times greater than the force of the tractor on the trailer.

B. 2 times greater than the force of the tractor on the trailer.

C. equal to the force of the tractor on the trailer.

D. 1/4 the force of the tractor on the trailer.

E. zero since the tractor is pulling the trailer forward.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.16: Which of the following principlexol t 89yl-dq-s best explains why large tractor-trailer trucks generally accelerate much more98- q oyl-lxdt slowly that automobiles?

A. To every action there is an equal reaction.

B. Everybody attracts every other body in the universe.

C. A force is necessary to change the speed or direction of a body.

D. The total momentum of interacting bodies is always conserved.

E. The acceleration of a body is inversely proportional to its mass and directly proportional to the external force acting on the body.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.19: A 50 kilogram;(tr4/ p jnr:rih/pez skater at rest on a frictionless rink throws a 2 kilogram ball, giving the ball a velociterit/:4pp h/ z;j nrr(y of 10.0 m/s. Which statement describes the subsequent motion?

A. 0.4 m/s in the same direction as the ball.

B. 0.4 m/s in the opposite direction to the ball.

C. 2 m/s in the same direction as the ball.

D. 4 m/s in the same direction as the ball.

E. 4 m/s in the opposite direction to the ball.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.13: An object near the surface of the earth with a weight of 100 newtons u/ c gismj5n4ukgi2.sgh8(,nt;n6oguj0/go is auug oigni8 n0 jom h6 /u/. n,c2s5kt(4;gsgjgccelerated at $4\;m/s^{2}$ . What is the net force on the object?

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.25: A car whose mass is 1200 kg is accelerated from rest0. io:v2t9jefp zgs 6n by a constant force of 2400 N. What is the speed of the car 8.0 s after beginn.:6i tj0f9zoespg v2n ing?

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.32: A 3.0-kg block with initial speed 4.0 m/s snpt +5nv:t;+fsv2zg :7 urwgrlides across a rough horizontal floor before coming to rest. The frictional force acting on the block is 3.0 N. How+u zr:w ; pn2tr57vn:ggtvs+f far does the block slide before coming to rest?

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

95.38: A block with initial velocity 4.0 m/s slides 8.0 m o:8p i7la7fo oc0wkp3 across a rough horizontal floor befopi ko8 :fw p7lac0o3o7re coming to rest. The coefficient of friction is:

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

09.21: A 20.0 kg box remsay5.z2i2 gl)h4uo bb ains at rest on a horizontal surface while a person pushes directly to the right on the box with a force of 60N. The coeff2z i5l.uy obha4s b)g2icient of kinetic friction between the box and the surface is $\mu_k$ = 0.20. The coefficient of static friction between the box and the surface is $\mu_s$ = 0.60. What is the magnitude of the force of friction acting on the box during the push?

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

13.16: A block initiallypw/r jq gd;xnns;h. *) moving at 8 m/s accelerates uniformly to rest on a horizontal surfg rqwh.dn;njs/;x *)pace. The block travels a distance of 12.0 m during the slide. Which one of the following choices best represents the coefficient of kinetic friction between the surface and the block?

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.21: A car of mass m slides across a patch of ice at a spei7ra*k65h +zmo :uo vqed v with its brakes locked. It then hits dry pavement and skids to a stop in a distanced. The coefficient of kinetic friction between the tiv +*ok7iuqa:o5hr6z mres and the dry road is μ .
If the car had a mass of 2m, it would have skidded a distance of

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.22: A car of mass m slides across a patch o o/c.x u,ras9p+ 6pmcbf ice at a speed v with its brakes locked. It then hirs.uax9/mp6pc+,c o b ts dry pavement and skids to a stop in a distanced. The coefficient of kinetic friction between the tires and the dry road is μ .

If the car had a speed of 2v, it would have skidded a distance of

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.32: he driver of a car makes an emergency stop by slamlu3*v)nxuawk 5sjs b.( 7z(bcming on the car's brakes and skidding to a sto)ka3(5lu .w(s7snj*u vbx zbc p. How far would the car have skidded if it had been traveling twice as fast?

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.39: The driver of an automobile must carefully controm8h9u6xl peyq7+ h mf+v.5 ifxl each of the following devices. Which of these + qp+lvx8ym6 efxhf59 ui7 .hmdevices can cause an acceleration in a moving car?
(1) the break pedal ( 2) the gas pedal ( 3) the steering wheel

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.25: The net force on a rocket with a weight orz h( 7nh:rgzhmgi ; ;v zz)3gd.g9h2ff 15000 newtons is 24000 newtons. About how much time is needed to increase the rocket ’ speed from 12 m/s to 36 m/s near the surface of the Earth at zn2mvh. i 9 3z; g rh:d(7zggzrh;ghf)takeoff?

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.21: A box slides to the right across a horizontal floor.ba ,f( pm3l9 gucsm:itxb 56)c A person called Ted exerts a force T to the right on the box. A person called Mario exerts a force M to the left, which is half as large as the force T. Given that there is frictiot 9bxcgma5pfbl6,i3u )ms:(c n f and the box accelerates to the right, rank the sizes of these three forces exerted on the box.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.27: The diagram below shows three roller coaster tracks ofef 4s(ub,9g/zsikkx* equal length. Assume that ksi/ 9gxf,4z ue(sbk*on all tracks the roller coaster carts start from rest at the same elevation and moves frictionlessly over the tracks to the finish.
If all roller coaster carts start at the positions shown, on which track would the roller coaster cart be traveling the fastest at the finish?

A. CartA

B. Cart B

C. Cart C

D. All would reach the finish at the sametime

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.28: The diagram below shows three roller coaster tracks of equal length. Asstfgod lvd,- 38ume that on all tracks the roller coaster cartsfvdd -lto ,38g start from rest at the same elevation and moves frictionlessly over the tracks to the finish.
If all roller coaster carts start at the positions shown, on which track would the roller coaster cart reach the finish first?

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.29: Assume the rollercoaster cartrolls frictiy190 yebr 4jwlonlessly along the curved track from point A to p0 y4rejy9 1wlboint C under the influence of gravity. What would be the direction of the cart's acceleration at point

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.40: A box with a mass of 50 kg is dragged across the floor by a rope zgs l6mv5m0yy u;);ctwhich makes an angle of 300 with the horizontal. Which of the following would be closest to the coefficient of kinetic friction between the box and the floor if a 250 newton force on the rope is required 5gsvz tm )ul 0y6;m;ycto move the crate at a constant speed of 20 m/s as shown in the diagram?

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.40: A 6.0 kg block initially at rest is pushed against a q9p tr**g3 p7z bue tuj0+r+/iav duf/wall by a 100 N force as shown. Thecoefficient of kinetic friction is 0.30 while the coefficient of static friction is 0.50. What is true of the friction acting on the brevuza+pp7 rb0/ u tj93 q*d tfui/*+glock after a time of 1 second?

A. Static friction acts upward on the block.

B. Kinetic friction acts upward on the block

C. No friction acts on the block

D. Kinetic friction acts downward on the block.

E. Static friction acts downward on the block.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.10: A homeowner pushes a lawn mower across+yop. f6x ts1i a horizontal patch of grass with a constant speed by applying a force P. The arrows in the diagram correctly indicate the directions but not necessarily the magnitudes of the various forces on the lawn mower. Which of the following relations among the various force magnitudes, W, f, N, P is CORREsyi1x+p .o ft6CT?

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.14: A book leans against a crate a /zqjkextrn: (+;1we7h7qx lis; fl4on a table. Neither is moving. Which of the following statements concerning this situation iew1tezl/lh+i: f77qr 4jx(; q;kas nx s CORRECT?

A. The force of the book on the crate is less than that of crate on the book.

B. Although there is no friction acting on the crate, there must be friction acting on the book or else it will fall.

C. The net force acting on the book is zero.

D. The direction of the frictional force acting on the book is in the same direction as the frictional force acting on the crate.

E. The Newton’s Third Law reaction force to the weight of the book is the normal force from the table.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.15: A crate of toys re4n8ao+cgtu lr;zu*hs3a /9l jmains at rest on a sleigh as the sleigh is pulled up a hill with an increasing speed. The crate is not fastened down to the sleigh. What force is responsible for the crate’s increase in speedup tou3; 9hagjnl*+z/4cu8t lr sahe hill?

A. the contact force (normal force) of the ground on the sleigh

B. the force of static friction of the sleigh on the crate

C. the contact force (normal force) of the sleigh on the crate

D. the gravitational force acting on the sleigh

E. no force is needed

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总分:43分及格:25.8分时间:不限时

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