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 inertia of an object when its velocity is doublh38+xn4zzxk+tvwj.zf r z-, oed?

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 depev,ts u to5d97*a.rzdwnd on the quantity of matter present. Which of the followintu 7aod9rz,v w5 *tsd.g 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. Assume t8id9 kz t)y;k nv5yk zm1/ax5hhe Earth has mas yntkh/;xv58zyd5 mka9i)1z ks $5.98 \times 10^{24} \; kg$ 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 1xlfw93ylr9 01x x7j3nrsngvv/x*m4h -b sit the surface of the Earth. What is the magnitude of the gravitationa-7h*lnvn 3g wbm 1x1 irxj3s/r xs09yv9 xlt4fl force acting on the earth by the 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 tls6n1(gy tv m(+4alboo increase while its acceleration (mvgallt nb 14ys+(6odecreases?

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 uu b2reh h;79(z7ktux motion. At every point in its motion, the direction of the particle’s mom7;h9x7er htzbuu(2u kentum 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 mx 6m1+ mkle/c .p2rlrstring held by a person. The person pulls on the string uniformly accelerating the block upward fo2lmmc1p + mxle.k 6r/rr 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 following situations is the n gej+wq defr( *bpm)z;+n :;mwcs.+rng 2+uzoet force constantly zero on th)p ;nj+ bgmg;f.n:e +sc+*d+woqerzmu2 r(wze 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 -(j o;fzq goqau8p4t2to 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 being stopped by the person? The magnitude of the object’s acceleration is a and the magnitude of the acceleration from gravity is f8azujpq ;- o( qt2g4og.

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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 qvgwterb5o7w,r *9u69 q )1 zrv;srui50 N, and F3 of 70 N, acting on it. The magnit 1urv99v*rer6 )git qwr q7,ow5uzbs;ude of the resultant 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 for. xafd:7c1p gipl6 m*hce of 10 newtons can be combine to form a resultant with a magnitude ofx1f6mlp:g7*hi.pc a d 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 is mtt nu8umx (d+7ost closely associated with Newton’s Thirdxm8utntu (+7 d 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 the action force bemw:0,ah /xi m en4hr/kcause:

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 acceleratingnj0qq,jp(qk99f3 cl- mqp*iw upward. Which one of the following choices best represents the Newton’s Third Law pair force to the gravitational force acting on the b- l(mwqji kqcpfpq3q*09, nj9ox 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 spee 7//3nreap aly9a,lzqd. Which one of the following choices correctly describes the Newton’s Third Law pn/97p ayrqae, al/3zlair 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 batn (s5/; eihdclr9 o4ywterswings and hits the ball. The magnitude of the force that the balie;5 co(s lyn9d/wh4rl 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 gm2(c.hf-sf j of the book is a calculator, also at rest. Which one of the following choiffmh. (c-jgs2 ces 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 Physicsuc)c x3+ d-irpmq(k0q I class were in lab conducting an experiment related to Newton's Second Law. The collected data were displayed )rq3(qcipk + d0-mxuc 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 an object were doubled while at the same time thela (0 *g* t geg394pzirjodyj1 mass of the object was halved,then tjez9r(i a31ljpo* d0g*tg4gy he 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 150w7 mcnsprd 6tyh; 5+h-0 kg is accelerated uniformly from rest to a speed of 20 m/s in 10s. The magnitude of the net force acc 7wcnh-psd+yr5t; 6hmelerating 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 tra+tx05b x 7rea(qg -: 5q9utzfd:aezjgiler is 4 times the mass of thq-jt uz09gz: (qaar:xte+ xd75 fe5gbe 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 expl+:vne ldp23ci1 hb ;jlains why large tractor-trailer trucks v n;3cb1li l+j2:edphgenerally 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 wgjy3b *zt*2g6 yw n2nvl;up ye b8cu/ 2ca37con a frictionless rink throws a 2 kilogram ball, giving the bal8pab/ 7uy6lvywccc2*g zut j;232 3 *e ngwynbl 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 o3,j+avjw hm4uau 6q25ulo k-cwao1,zf 100 newtons is accelewk25a m-j 4au31,owo6lqv uhaz+,uj crated 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 fl- ir5lgqg0r3sg* 6:brqbn z:orce of 2400 N. What is the speed of the car 8.0 s afteqgl:3b:r0 sznrqbgr*l 6 -i5gr 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 acrofu0zs ;m jw-cpsc6b 00ss a rough horizontal floor before coming to rest. The frictional force acting on the block is 3.0 N. How far does t 0bwsu -j6p0mcc ;sz0fhe 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 velocij;r(bl*f /ca5y 3 m.erbgsyswn3+h v, ty 4.0 m/s slides 8.0 m across a rough horizontal floor before ;bvmy+s *e5s,l(bn /y3r 3ha.jcwrg fcoming 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 remax:7q 46jsmn9qx1xgtw 9x2 ki jins at rest on a horizontal surface while a person pushes directly to the right on the box with a force of 60N. The1t i9kms2j79: 6 qgwxjqxn 4xx 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 moving at 8 m/s accelerwfaq,6f e/rz +sfy*k y4( hl,dates 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 frictioy(lh ,f6r+qe/w4y f,kfza *sdn 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 wm8yi)sun*c4of 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 s)4yi cwu*mn8 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 j69n ahh+ otjly.c: 5pa 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 ao jy j .c+:6ha9ptnlh5nd 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 haxrp lw+bfc14 w91v-the car's brakes and skidding to a stop. Howr+cpfbla9 1 whwv4- x1 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 ude:mujg s2kac)3ll 19- obc9carefully control each of the following devices. Which of these devices suajmlc: 3dg c-u k9ob92 1)elcan 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 1w p 0;felco*+z. ua4 tafx8slhyha0+85000 newtons is 24000 newtons. About how much time is ne+le8 0+soaatc0h4hxuf 8l .* z ;awpyfeded 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 person calle kcak ht8i ;p3: hnmy)z:2o g3osrb49md Ted exerts a force T to the righ3ih h 9)g2zsbotacpyn 8 :3r;mom:4 kkt 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 equa+*d+ o fjxxh r2 w;-(lemkzgw*l length. Assume that on all tracks the roller coaster carts start from f+wjxdx lz- (e ;*grh*2 w+mkorest 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 equz/- 946yjbrsp cj+lsz*cw8zll k r)2t al length. Assume that on all tracks thb/2slll8)pr+kzc z r4s z 6cywj*-j9t e 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 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 along the curved t9h-ga7rx.p 1b+xvrm 9; xrf4 j ci.wnp9:nvas rack from pxcb.h j.:v9prnrw1rs+;i xafxapm 79 v4gn9- oint A to point 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 massh0b 6fp 1bny6wk;1yput o7v4yp 5 vq8b of 50 kg is dragged across the floor by a rope which makes an angle of 300 with the horybw h1ykb0n5o6 4;y7bpft1u6vq vp 8pizontal. 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 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 c2 88h kvd1zj+dr3 br kgo6k:kN 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 block after a time 2 ko3 kc6kdzkjgd1:b8vr+hr8 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 mowqdz**d tf , 0r,byh;w6,ffc ejer across a horizontal patch of grass with a constant speed by applying tcr 6z,wh;*q ey,bdf dff, 0j*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 /cnb2bx rk3h4m hzte:;56 -va 0uwikt table. Neither is moving. Which of the following statements concerning this situation is CORRECu bz2av/teit6r4c5 khhkwb0 :nm3-x; T?

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 icjy2bqdtt(cbm07 4 7hill with an increasing speed. The crate is not fastened down to the mtj(cb2i4c7t7qbyd0 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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