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 its v4s.a3 a9wv7 iud89 ce2wkroh4 nlcv7helocity 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 de* 0.pa zn:x(vxeujj 2epend on the quantity of matter present. Which of the following properti 0v.(xp*nz2ejju :xea es 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 /w5olg*yg98( uskxnvs)9k x)nq;fo d rests on the surface of the Earth. Assume the Earth has m s/5oy* sdu)nvfgk xk9x(q)w;o98lgn ass $5.98 \times 10^{24} \; kg$ 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 i1-lx lef: ye,bn ol31ss in free fall near the surface of the Earth. What is the magnitude of the gravitational force acting on the earth by the sphere? Theb ll 3:exfs1-lyo n,1e 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 veloc7)7b uqu .k-g r 6w0bbh ie2d2oeec*jpity to increase while its acceleratioe6 eco.7hwuq)jg2dbpu 2kb7b er0 *-in 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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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.11: A certain particle undergoes errbd 2m(ws098 d. vvutmykw 1g x.wg8)wsatic motion. At every point in its motion, the direction of the pkg.mvwuwtd2 8s(.b 1xg)8dw y 09msvwarticle’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 suspes-4 gaas 9j4zf/o- lyso p9x0tnded 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 the following choices correctly identifies thsz loja y0sx/p-9at9s-g4of 4e 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 t65 kgt hwt-yda7p)n7following situations is the net force constantly zero on the o anwyth75)t 6gt-7 pkdbject?

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 persoxb2dyxb9/y4bc;dz . dn 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 adxyb ydb4b;z.x /d2 c9 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, anwwc9 uvs iqdu5-pz( 8*d F3 of 70 N, acting on it. The magnitude of the resultantcwp*w 95q(vsu8 zud-i 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 x/dkp 1 gk:lpgi39v7l and a force of 10 newtons can be combine to form a resultant with a magnitude of which of3pklpd: 7v1ikgx9/ gl 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 s3es6mp zd/3w ftatements is most closely associated with Newton’s3 3z smfp6wed/ Third 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 force does not cancel thmc*./4 .p i2 -d2tlf mobbaqboe 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 floorq)i9w:gt+ r5tl 32i eyf)sp l0qz8wzg of an elevator. The elevator is accelerating upward. Whicql el f q3)z 8 ypi:gzrw9t2ws)0tig5+h one of the following choices 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 (74a(5ibthu2 w+iq: wlhllhy downward through the air with constant speed. Which one of the following choices+ui(t hbi(25yhlql4h : 7ww al 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. cm; //ui1lo (.olyzsb The batterswings and hits the ball. The magnitude of the force th zilcb(/;/mos1loyu. at 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 r k1 y*ueqit-0iest on a table. 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 fo 1i tu-0yqke*irce 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 we lzr 83a0) eytv:geyc3re 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 ceat3l :zgcv3e8)yr y0 an 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 force0- sa,* gsicr o pdf*f3o jbq6xa7l,(s on an object were doubled while at the same time the mass of the object was halved,then the ao ,a0* (os qd6sgc lj7-3af,pbifr* xscceleration 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;tyf1 u z4ub5v rest to a speed of 20 m/s in 15yuv; 1fbutz 40s. 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. The mass of the 1( gb da+g24 sx5i zirxdqd0l5trailer is 4 times the mass of the tractor. If the tractor accelerates forward, the force that the traildzq5+sxg1i4 rid2a 0l gdxb(5er 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 tractor-iiwm 74. r5f vcuw-q4dtrailer trucks gene q.v c57if4m iwuwr4d-rally 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 rest on a fr *b3 lzex.(t25 mbgiquictionless rink throws a 2 kilogram ball, giving the ball a velocity of 10.0 m/s. Which statement describes the subseque(qix ug*z35 tm .lbb2ent 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 1nmxdk*ftvtiw.2 ) u9earth with a weight of 100 newtons is ak ttin*u vw)d.m1f9x2ccelerated 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 rest by a constant force x.dqq+: f ao-yof 2400 N. What is the speed of the car 8.0 s aqo -+d ya:.qxffter 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 rou m5dpio0 0jxa.2 8ugueujk h)-gh horizontal floor before coming to rest. The frictional forcjpu2u5 ik-a8. h0xmud)0 jo ege acting on the block is 3.0 N. How 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 across a rougok,-l plx)b2s dx+uq/q1 kco6h horizon2 cdbl6-q+)k,uxsop o xk1lq/tal floor 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 yq+rsd (j epnr1+lhxhkz6 wt-05t4*yon a horizontal surface while a person pushes direct(xz nwp*ysj61 +t0hredyt4lhk- 5+r q ly to the right on the box with a force of 60N. The coefficient 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 initially movi5+nw m9w68wja ru )gj hbx)o2k:,lwting at 8 m/s accelerates uniformly to rest on a horizontal surface. The blo hjww:g onmk8)9x+rwi6j) 2l5b,uatwck 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 aoma-sw;s w+7d co dml-sz :g8)cross 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 and the dry road is μ . m; )-sz7-s:gdm+d owas o 8wlc
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 of ice at a speed v with its brake7mwlwvxyv :;jcdkthn f:: bu7; e;.g+s locked. It then hits dry pavement and skids to a stop in a distanced. The coefficit 7d;::v 7f+g.w;w cm jexlhynv:;bkuent 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 lxfloy0o0xnhb0vx*( 45 to z pqsy/9 8emergency stop by slamming on the car's brakes and skidding to a stop. How far would the car have sk lxv4bh0o8to0 0 pqo9l/fyy(zn5*xxsidded 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 cgm/ hwlu 3i6ov 7,v-wcontrol each of the following devices. Which of these devices can cause,6hgvwuo 73imv lw/-c 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 16 k/hv*, ra u d1b;tch+dq oawn (2hghqk;v1la rocket with 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 of the Earth at 1(*uka t/o; rhk ;1hqn1+ a2vhw,l bgdhv6qcdtakeoff?

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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 lba:w;vu 7/ao ,rtx(0w/tsf eright across a horizontal floor. 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 / /a saot7f:uwv0e;( ,txwl rbas 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 equal lmput9 h: d) 3ro.+u;heq;l kejength. Assume that on all tracks the roller coaster carts start from rest at the same elevj )p;9 hqhe +.t ;r3eoum:kdluation 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 trm p+4e+ uc0rgmln6b28,h)s g wqf0mrh acks of equal length. Assume that on all tracks the roller coaster carts start from rest at the same elevation and moves frictionlessly overulhrg,ps0em + n0h q8b )+fg624c rwmm 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 as; 0lnkk3p nfe k4)/ kkujs4i)long the curved track from point A to point C under the influenck;/spjk)n l 4e40)iufs nkkk 3e 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 acrouv sxig7 8uq5/rlee0.z1zvvkw*wt96 ss the floor by a rope which makes an angle of 300 with the horizontal. Which of the following would be r 50u*luske7w6w 1v xtez 9v8 .gz/vqiclosest to 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 againr7z0;ep *g.ewv o-lcxst a 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 fri-pogr .;v07lweecz *xction 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 of gray 74ts2aju bl ;0tdb0fss 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;2 s74bluy0tj 0ftd ab, 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 adys cu5yt76ga63:z7 /hamngjgainst a crate on a table. Neither is moving. Which of the following statements ujm6dya 3a6y 5:7z c7g hstng/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 az0) ednj*9kti qrn32yj :3u.c7yuvfd t 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 k0f2c3iv9 en. untyr dd)z 37*q:jujyforce 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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