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

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1#

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 y/w .3 8xeoac04s5rtkh ,qmc mits velocity is doubled?

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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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.14: An intrinsic property of matter is one that does not depend on thn0dw hdlb+ p31e quantity of matter present. Which of the following properties is NOT an intri+hddb3l w0pn1nsic property?

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3#

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 surfafqb ;-q50qv fh)uc* 7fvgkwq)ce of the Earth. Assume the Earth has massq7qv*f5-)cfu)g0bf qh k;v wq $5.98 \times 10^{24} \; kg$ 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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4#

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 near the surngg)cfyb (8y 9ai,*p - imj0nkface of the Earth. What is the magnitude of the gravitational force acting on the earth by 0j(a-n9*fby8p) ii ,n mg kgcythe sphere? The Earth mass is $5.98 \times 10^{24} \; kg$ .

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5#

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 velocity to increase while its accele dvy1bm mbc tx/3:;c nqf35yo.ration decreas n/ 5myb:.bc;3xcy1ot3fd vm qes?

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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6#

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 every point in (, 0yvhzdbpt(its motion, thev,p( b(0yz hdt direction of the particle’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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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.14: A block is suspe9yrgjopouxm2d+(p*w 05,iq f nded 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. During this time, which one of th0xdgw(, po*p5+r ou2jm q9yife 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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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.18: In which one of the fot g-yh a1z:l,ullowing situations is the net force constantly zero on thz ,u1-yh tgl:ae 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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9#

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 the ls19pnh84 .tr1bbxxd,o cd d;ground. A person intervenes and slows the xdxbt nod8 ,9 cl1d1rps.b;h 4object 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 and 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, Fi (l bj.qdb lx3a e4xttsthr92;taq, 9e-6l5 w1 of 30 N, F2 of 50 N, and F3 of 70 N, acting on it. The magnitude of the resul qi bx6ahlq5j2l la9ebt(t4x. t de9tw s,-r3;tant 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 of 10 newtons can j+ xmln4rd *8idn43zs be combine to form a resultant with a magnitude of whic rdd4njl 38+xm *s4iznh 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 is most closely associated with Newtonky7j4wa7 a( ry;) h5x kqtfy3t’s Third Law of Moti7(3ahftxw457qy yrjt kya); k on?

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 force does not cancel the a* -2lw zm,p k myk8va2d+ldv8xction 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 elevator. The elevator is accelera5*fz:qb3e-q (lq:3myoehn z nu8mj)n y3l3dcting upward. Which one of the following choices best represents the Newton’s Third Law pair force to the gravitational force acting on the box by the(yqhqycd3 nu 8fz l)njeno 5-3el:b*3q:mm3z 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 downwastmifk+e +6dce 0 21iwrd through the air with constant speed. Which one of the following choices correctly describes the Newton’s Third Law pair force to the air r0d ci it1kw +e+2esm6fesistance 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. us;z zi)x 1(v7 5 tp-cdppar*y The batterswings and hits the ball. The magnitude of the force that the ball e izt p*y) dpcxvr;zps7a5u(1 -xerts 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 fq f6q.kns3yns,)+gh rest on a table. On top of the book is a calculator, also at rest. Which )hgq+.3sf qksn f n,6yone of the following choices is the Newton’s Third Law pair force to the force that the table exerts 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 clf( te4j;+ vxcpass were in lab conducting an experiment related to Newton's Second Law. The collected data were displayed on the graph at the right. From this graph, what conclusionsftpc(+4j;v x e 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 an object were doubled whim8ob7*zv ( g9r* xubavle at the same time the mass of the object was halved,then the acceler*a97x8gv zmuvr o( bb*ation 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 rest to a speednp2*6/u8wwho wqd ep : of 20 m ww82o/u*:ewn pq6d ph/s in 10s. The magnitude of the net force accelerating 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 t:m 6 rc3/dmo23udtfem raveling down the road. The mass of the trailer is 4 times the mass of the tractor. If the tract3temr:2m uc /d3 o6fdmor accelerates forward, the force that the trailer applies on the tractor is

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 principles best explains why large tra4kyf 8: zokuej/vu:w.ctor-trailer trucks generally accelerate much more slowly that autfuk:u4: vk.eo8jy/zwomobiles?

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 skater ,b+b(l*i uctxgwa)/n at rest on a frictionless rink throws a 2 kilogram ball, giving the ball a velutn a )w, /g(cblx+bi*ocity 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 earg0rg3b1hq7qd 5vf 8kjmi92r kth with a weight of 100 newtons is acceleratd qh15f bg 8rk0r39imgqvj2 k7ed 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 okxr+)r 7n:pn kg is accelerated from rest by a constant force of 2400 N. What is the speed of the car 8.0 s )nk 7rro :+npxafter beginning?

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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 slides across a rough horizonthd cyx f+df(8,al floor before coming to rest. The frictional force acting on the block is 3.0 N. How far does the block slide before coming to resfx(d8+ fyhcd ,t?

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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 afh 35bri;rz70x p7:+;k vyi mhyt j7nm across a rough horizontal floor before coming to rest. The coefficient of friction is: var0+ihr7:5 7kfz 7b;mni3pxyyh t;j

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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 remains at rest on a horizontal surf 9ftwmg k8 j(3v/uri8gli,0 uxace while a person pushes directly to the right on the box with a force of 60N. The coefficient of kinetic friction betwe8 x93,lj8tiugu/vgw 0k(imf ren 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 initially moving at 8 m/s acceleral/. cou;w22m v mjmj(ates uniformly to rest on a horizontal surface. 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 th/wocvj2 (ulam2 m;mj.e 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 acr1t a0rauzt9 9 hacjh;6oss a patch of ice at a speed v with its brakes locked. It then hits dry pavement and skids to a stop in a distanced. The coeff ; 1j9utcazarat096h hicient of kinetic friction between the tires 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 a t,+xnyn 4gf*45oki(z hj-vdscross a patch of ice at a speed v with its brakes locked. It then hits dry pavement and skids t54iny-k fxvj (tn sg,zhod+4 *o 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 cg 7rs-8uj 2mbcar makes an emergency stop by slamming on the car's brakes and skidding to a stop. How far would the car have ski-87u gs2 mrjcbdded 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 mustfiz6 +,jjht2k ea qj-lk.:d*h carefully control each of the following devices. Which of these devices can cause an 6-h:.zij, j eaq*l+kd2tjk hfacceleration 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 wit x5 w;sp ei2r*xtbo/c;h a weight of 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 xpt52i/ xorc;s e b*w;of the Earth at 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. A person called Tedwnq*vg9e jz2g vy681sj r49wi exerts8jzie j2n4rvw g1wgs6 *qy9v 9 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 friction 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 of :6) a1lxpmp,l,1 wxfqf7)ni xr+c xukequal length. Assume that on all tracks the roller coaster carts start from rest at the same elevation and moves frictionlessly over the tracks to the finisf xwl1xufkpxl c) :p)x rm67 +ina,1q,h.
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 equaebz6 p +l. )sp2*uu4lgjyg yz7l length. Assume that on all tracks the roller coaster carts start from rest at the same elevation and moves fj ul)z lpu.zesg24b*gy py7+6rictionlessly 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 cartro6jcyll 1j ,lv4 uk2j9r( s;ryells frictionlessly along the curved track from point A to point C under the influence of gravity. What would be the direction of 9e2jl1j6 ;lyul(k crs4yj vr,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 t 0rkk9,r mw,(,l ilxnhhe floor by a rope which 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 to m wki(xm lh9rl,, r,0nkove the crate at a constant speed of 20 m/s as shown in the diagram?

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教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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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 wall by a 100 N fjy(jpypte40, bg /i8rb) f,ve2utm5p orce as shown. Thecoefficient of kinetic friction is 0.30 while the coefficient of static friction is 0.5tju e2y,i0b,ej/( 4mtp p8 )yf pgbv5r0. What is true of the friction acting on the block 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 pu- +*o1r 1efz1szvwuvav vg3ia(7arl* shes a lawn mower across 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 va+f*aouwgzvzr- v*vi 1r 1al1( 7ev s3arious forces on the lawn mower. Which of the following relations among the various force magnitudes, W, f, N, P is CORRECT?

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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 on a table. Neither is mov4ezz e 14zp*r dec08aving. Which of the following stateevzr de8p* c4ze4az 10ments concerning this situation is 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 remains at rest on a sleigh as the sleigh is pulled +13m1wq2mzuj) ut. 8gfd0 tk-i vmufaup a hill with an increasing speed. The crate is no.u+kfftmmu0 ugd)-a11twzq32jm 8i vt fastened down to the sleigh. What force is responsible for the crate’s increase in speedup the 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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