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

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1#

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99.36: What happens to the inertikgt yz5sd: a)j,gaw -1a of an 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 prope 9ylkb4 gi0n68*d-ybyrwko06p z9wjxrty of matter is one that does not depend on the quantity of matter present. Which of tw6*ibx0 8pg9kdj wny6 kblzy- 49o0r yhe following properties is NOT an intrinsic 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 surface of the Earth. Assu(r2 1 sndu*fvame the Earth has m*(nvu d fasr21ass $5.98 \times 10^{24} \; kg$ 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 freef hl;3in n6f1e/rd 1xgf6upi9 fall near the surface of the Earth. What is the magnitude of the gravitational force acting on the earth by the sphere? The Ear; hrg6 3x9fl ipf/in1efd1 n6uth 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 tzq+kipzuq 1 8:axm(0r o increase while its acceleration decrem(xki1rup + qzqa:z80 ases?

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 ev5ct 5.+d0f-yfd j ymraery point in its motion,- 5tyr.cdfj+0afm5d y the 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 suspended in the air at the end of a stohog *-lfppja-cl+e md7q84 2 ring 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 the following choices correctly identifies the Newton’s Third Law pair fo+8*-gae 27lpcjl-oq4 m pf hdorce 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 following situationi i sz8j88;aqe+hjh p*6yo+gxs is the net force constantly zero on the oe gzhi8xj*js6q o8a; ypi+8h+bject?

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 facsap1;t 1 .rbxll close to the 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 be1cst .ba1xp;ring 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, F1 of 30 N, F2 of 50 N, and Fq o 50)wcc:-r fvcw26r lzqbcxvli)/*3 of 70 N, acting on it. The magnitude of the resultant ofF1 and F256zl-xq)vi b/rcl2o*f0 w:w r) ccvqc 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 a 0 ifq.ahvli pa3c3s 4*resultant with a magnitude of whichvq3pha.c isli0f43* a 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 fogd u-r9i0gi ;fafa1 ;8zplm g(llowing statements is most closely associated with Newton’s T0g; lpiu ;gg9fzm f(1 -i8draahird 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 fosjtg;zxouko9l px2+5p b :f:-rce 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 elevator. The elevator is accelerating ( ky.yingd-rj9d 8qb; upward. Which one of the following choicy-nbd8.kd jq(gri 9;yes best represents the Newton’s Third Law 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 dowfk :mzx;fitui;h )3 5mj0fqj.nward through the air with constant speed. Which one of the following choices correctly describes the Newton’s Third Law pair force to the air resistance acting on the skydiver duri3x kf.q ;ji)j0m:zumf;ht i 5fng 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 pitchersz :iy 6l is7- fiek3q10vuvglax4mes0d (d:6 with a speed of 35 m/s. The batterswings and hits the ball. The magnitude of the forc:kv(qd-s1ei 3u 6gdxs v :ii7e 4 yf00szl6lmae 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 the boox clg+0gt pt6-1n y6zrk is a calculator, also at rest. Which one of the following choices is the Newton’s Third Law txn+6z60t- pg r1glycpair 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 class wer3mn6i t,)a z2wr 4yunp5giha2 yf3pu )e 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 conclusions cn 3zui6 anr3y4w2f)2gphiamy) 5t, p uan 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 an5mp 5 -ac05w rrc* kf3fs om4d.heosd: object were doubled while at the same time the mass of the object was halved,the0 wa*fcc pe:3o-5o dd4hrs5rsfk.mm5n the acceleration 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 spx *)(1rg8gj/dordivkv6 /acr eed o/8 x kc6*/jvrg)vdadorig(1r f 20 m/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 traveling down the road.cbqq7 qq591;g qf tes4 The mass of the trailer is 4 times the mass oft1gqb7f;s9q qq ec 4q5 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 principles best explains why la h4rf8veuu8r9s w+ fg9du-u2drge tractor-trailer trucks generally accelerate much more slowly that automobruuw8hg vr2dfd+su -94f9e u8 iles?

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 r(oe8qf .sc,;a u1z yvskater at rest on a frictionless rink throws a 2 kilogram ball, giving the ball a velocity of 10.0 m/s. Whizu8qsf e .o y1;a(,cvrch 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 of9c.eh9ey 7zcwua8we*e ,p+on 5n-zv w 100 newtons is accelerated at zez e+w9o 9 8*w cunhcn.5pywee-7 ,av$4\;m/s^{2}$ . 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 fromp),e s- yie9-jw2lb tr rest by a constant force of 2400 N. What is the spee r),e9l--j tebsy iwp2d 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 speed 4.0 m/s slides across a rough horizontdya8t 12 om/g 4nabqm xi)+g0wal floor before coming to rest. The frictional force acting on the block is 3.0 N. H01wb) t man 2gx/maq48iy+d ogow 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 ver:qy(mll)w2+20 mv5l m5dopxf + j spglocity 4.0 m/s slides 8.0 m across a rough horizontal fldm 2s2+org5)5 0mpqv:( xflwlly mjp+ oor before 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 remains at rest on a horizontal surface while awex2dba1y0lp us7 u5 twxq2.mh+ 5nt;ais)/n person pushes directly to the right on the box with a force of 60N. The coefficient of kinetic frictio/byex 2q wxt5dh lni07;tsa+ 52)umasp .1 uwnn 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 initially moving at 8 m/s ac uw8p3cg-5 s9p sb;chgcelerates 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 bestbggp ; 835-cs9shpwuc 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 speed v with its k*h13r3j o x28;mgyzge-x pjf brakes locked. It then hits dry pavement and skids to a stop in a distanced. The coefficient of kinetic friction betweeny e;k1gzxj-gr p28h *jmo33xf 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 across a pavaz78q vk) vy5*ug5o xtch of ice at a speed v with its brakes locked. It then hits dry pavement and skids to a sto7 v*)gxa5kv5 qvo u8zyp 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 slamming on thl g)*j1*9mpf*mwfv i5. usiptck .kb :e car's brakes and skiddi mf:pkskij)u**mv if9tcpw.b.g 5* 1lng 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 carefu *zgby0 1nr)ew*qvx vb5js (6vlly control each of the following dev(bq6 s)5 j bxzyve0vgw *n1vr*ices. Which of these devices 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 of -nc4k 2g+cd, v i,ticm15000 newtons is 24000 newtons. About how much time is needed to increase the rocket ’ speed from 12 m/s to 36ci,ik nm4tdg- c2+v, c 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 flo41uaaoq 0 llk)ixqvxa0-7gi2or. 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. Give-qk4 x)x0a027l o1 avaguqil in 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 shkcbk8 62almw16 n l7 o,gw3-9uotuq plows three roller coaster tracks of equal length. Assume that on all tracks the roller coaster carts start from rest at the sam6k ,1omtulklu-9pwg36ql c 2 7noa8 bwe 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 sho36c pa,7wst hiws three 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 , shc6 t3aiwp7tracks 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 frictionleq 2ud .xrl30q+- hsiik6 q94tznzp t8gssly along the curved track from point A to point C under the influence of gravity. What would be the direction of the car.-+uqti 3dz hlr gt6 2qksnz890iqx 4pt'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 pgzks(5wl2f ct kp o(229 q8wtacross the 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 requirqlwptpwk gs 2zc5(t2o2fk98 ( ed 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 pu6r jqm5 omq(i(te w.n cun 0hn41x7yo,shed against a wall by a 100 N force as shown. Thecoefficient of kinetic friction is 0.30 while the coefficient of static mwh(0 uyn4i .c6 emx1 o5 ontn(qrj7q,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 across a horizontal patch o 9x4 rdgt4 pbob1(b1luf grass with a constant speed by appl1xdg4b9t 1u br p(l4obying 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 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 mov.i 3/z- -4w:qwubkr; rxgwekcing. Which of the following statement-kerxki c4-ug;:.ww3r bw/q z s 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 (jn ;+v czf-bsup 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 spe-+;jbcvn(zsf edup 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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