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 aj.swpf.mg/n/cm:omx)b (* 2c1 bu owyn object when its 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 mattehwvvw - l43j+or is one that does not depend on the quantity of matter present. Which of the following properties is NOT an intrinsic pwwj-4 ov+ 3vhlroperty?

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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 surface of t2y:oyl-t6 isvsj 5e5hhe Earth. Assume the Earth has mass yvhy 6itj eoss25: 5l- $5.98 \times 10^{24} \; kg$ 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 q:pt ;cif p:*7p wv*:up*mugi near the surface of the Earth. What is the magnitude of the gravitational force acting on the earth by the sphere? The Earth mav7gp: q up*;tcwi:up:i *pm *fss 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 accelerz-h;.uy ru ah6 l9fh(qd( x8tyation decrea (xl(zdhy - 8.uqah6;ftyu9 rhses?

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 und fsy*ff15)x az8ye-l yitk*3wergoes erratic motion. At every point in its motion, the direction of -xywkf5fy3le *)i1s8*afzt y 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 suspended in the air at the end of a string held by a penvyj6v*3v9-s9f lq84su 2xh wh 4clayrson. The person pulls on the string uniformly accelerating the bl -q8 lv4w uy *9h vyhfs4x9lcasjn2v63ock upward for a short time. During 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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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.18: In which one of the followinsxiniy t+ )3l l/i+u)cg situations is the net force constantly zero on the obu ctyi)s +l i)lin3x+/ject?

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 ground. A pers4s/0f /fsho:z4otxc0ij wb /bo, ynv (on 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 and the magnituns4s/ z(b/:x0vy/4o o,f oj0tiwbh c fde 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 9xrvr0a73zflf 2 qj l0has three forces, F1 of 30 N, F2 of 50 N, and F3 of 70 N, acting on it. The magnitude of the resr2aq7l 39fzx 0jf0rl vultant 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 be combine to form atm4*9 kenf zko5v7,q o resultant with a magnitude of which zv*ok4 f neq9t5om7, kof 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 statemiyo13oq*n w-u ents is most closely associated with Newton’s Third Law o-n 1w*quoo3y if 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 force does not cancel the 3fd6b.xx2r;z h)6 cjhav/i deaction 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 md0 idi8it:x+b1)9gemlk4 6ksjiec6 of an elevator. The elevator is accelerating upward. Which one of the following choices best represents the Newton’s Third Law pair forcesi xm kd6ic680 bg:im9 jl)eeidt +41k 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. x*yi27 1bi4pys/da vd Which one of the following choices correctly describes the Newton’s Third Law pair force to the air resistance acting/a*4 vibd 1ys7p2xydi 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/sii(ztmyocurod9 )9p)w- v) w(. The batterswings and hits the ball. Th99) i(ci)p(vr wot)uz wmo- yde 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 tt z+ve.hsij66able. On top of the 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 exerts +s 6ti.6z vhjeon 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 u6 nvfp: u bbc yajn*w)o;a;xb.31*i gclass 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 concjun : fxb*bioyga v ;6a*.up 13n)c;bwlusions 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 while at the same time t1 xh ji4(0 11caw fzn,uttgvg-he mass of the object was halved,then the acceleratiov1az,t1hg(-0 1uw jxft ni4cgn 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 /i n1npdq4szrczvy1w- i8 f8*umj/( waccelerated uniformly from rest to a speed of 20 m/s in 10s. The magnitude of the net force accelerating thmyqndv/csjn8wf* ri1 i(z u /-z8w4p1e 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( yfvmb )a2ilrv tkqxc3e7pn8,+ hm(3 mass of the trailer is 4 times the massm(q2,a3iev hc 3vm+lfp7k tx ny)r(8 b of the tractor. If the tractor 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 priq,wjro;/e7p*g uym;u nciples best explains why large tractor-trailer trucks7m j*r;gup; ,owy/que generally accelerate much more 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 skater at rm 6b1 )cf rymvmx118tuest on a frictionless rink throws a 2 kilogram ball, giving the b81m)mf1ucr yb16 xvtmall a velocity 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 10sf lr8qjp(,4 sj zeu3*2c) sxk0 newtons is accelerated)x3eqcsksp ljj 24 s,(8*rufz 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 restml/ct) fjs (5/chmkce,v go++m4w*q8 tyexf) by a constant force of 28e tj4 ogc)em(skl qcmwh+f,t5v+yx f/m )c* /400 N. What is the speed of the car 8.0 s after 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 s8jv t7c szmlp5may9)p/5ir5gpeed 4.0 m/s slides across a rough horizontal floor before coming to rest. The frictional force acting on the block is 3.0 N. How far does the )ljs7 8 mcigp/55mrt z95yp vablock 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 acgg6wk ywtb1wn 9(+on8ross a rough horizontal floor before coming to rest. The t g(9n 1oy 8k6b+wwwgncoefficient 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 remains at rest on a horizontal surface while a person pu5pqaso io sul;p61ze9jz /*vz ,7zw 2zshes directly to the right on the box with a force of 60N. The coefficient of kinetic friction between the box and the o56zzj 1w;z7s,*ziz qe 2auovsl/p p9surface 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 (9kqxi3d(rexey6r )b-kjs z+/s accelerates uniformly to rest on a horizontal surface. The block travels a distance of 12.0 m during the slide. Which one of th( kbr3s e-iq x6x e)rz+k9y(dje 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 pamtjmflk1)w52g (0 rj 7twmpk ;tch of ice at a speed v with its brakes locked. It then hits )p20ltwrjgjfw m1;(m 5km t 7kdry 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 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 acr8:g+uroe i6 wsoss 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 coefficient of kinetic friction between the tires+8ugis:o ewr6 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 slamm wuvmnzzkf6ry:+42 m0 ing on the car's brakes and skidding:wn26yvrz40m mfu+k z to a stop. 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 control each of the followingzsl w)al-8s* a devices. Which of these )za -l as8sl*wdevices 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 weigi8h1 h(owotyu ni* : iz*:0r5ljcog *qht of 15000 newtons is 24000 newtons. About how much time is0n*5wogh o(c 1 *qzit i:y*:rh iojl8u needed to increase the rocket ’ speed from 12 m/s to 36 m/s near the surface 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 pe8uu+,d8cmhlai u +1rsrson 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 friction f and the box accelerates to the right, rank the sizes of these three forces exuc8m1ds+uair ,lu +h 8erted 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 thre*fjty6z68 cdher:,c y e roller coaster tracks of equal length. Assume that on all tracks the roller coaster carts start from rest at the same elevation and moves frictionlessly over the tjrth *c6dc:6z, fy8 eyracks 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 rolbg 2t msq.z2,mler coaster tracks of equal length. Assume that on all tracks the roller coaster carts start frommzs,g2q.mbt2 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 frictionlessly aloncq 469f5va)pjq 5 paqxs2*vhg g the curved track from point A to point C under the influence of gravity. What would be the ah4 aq p2659 fjc p*)vg5xqsvqdirection 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 acrossnof 5qas1k h3* the floor by a rope which makes an angle of 300 with the horizontal. Which of the following would be closest tona1*kof 5s3h q the coefficient of kinetic friction between the box and the floor if a 250 newton force on the rope is required to 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 wall by a 100 N for 7z:, 6xd:ywb:d bcvgepm2b*gce as shown. Thecoefficient of kinetic friction is 0.30 while ycb,e dg pz6dwb v::7g: m*x2bthe coefficient of static friction is 0.50. 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 pushes a lawn mower acros /on:2e+nut: t tft2qqs 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 neces:n ttfqn:qto t2e 2+/usarily 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 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 cra f7- luk9eyxa8te on a table. Neither is moving. Which of the following statements concau79ky e l-fx8erning 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 up a f::zlsd j2xcpuj)o+m7aro 02hill with an increasing speed. The crate is not fastened down to the sleigh. What force is reso :djz+joc7u plr) :x220fmasponsible 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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