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 velouma7 lsp8;p*cnvz-+ eho5zy0 city 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 the qv/ hq6:wmk2upco1a9m uantity of matter present. Which of the following properties is NOT an intrinsic pvmu6 co:1 wqah2pm9 /kroperty?

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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 Eqrnb, k57w -x3v/fi g5ofdf /varth. Assume the Earth has masswr3f5 vqxk,vgf d5- oif7n//b $5.98 \times 10^{24} \; kg$ 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 surface of the Earth. What is k9)vya7:u+wzv l j4nv the magnitude of the gravitational force acting yawvjn)v9v:kul4z7 + 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 to increase whi.7vx,3mok:mz e9c jkq-fltczyt )z7 t-n;nf2 le its acceleration decreases?z:; l t,j.ko7zm2fnv-9ktc3t f-7 nz)qmx e cy

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 um2t wdug.e b, xe;;s j3/hqm:undergoes erratic motion. At every point in its motion, the direction of the particle’s momentum is ALh:u dm;jeb3;2t q. xsu/m,g ewWAYS

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 ofbn(aeo j5*v026ljcn d+pj l2t a string held by a person. The person pulls on the string uniformly accelerating the block upward for a short time. 0a2no c2lpejjb6+( n*lvdj5 tDuring 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 net 2 z,mg5qz 0lc77nsh cntur.8v k/ 7jmiforce constantly zero on the object?ng n0cmtmr/7sz2uki., lz h87 5jcq v7

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 p8jfvw9:1 : mjgirc-3y pi8uyu erson 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 fgrj m ifiu8v-p1j:y9 w8:uc y3rom 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 mrpf:9zwygbrb(ut.6m ur 36 2N, and F3 of 70 N, actfymur gtw6 (m 2r3rb9b6z u.p:ing on it. The magnitude of the resultant ofF1 and F2 is

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11#

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01.07: A force of 6 Newtons and a force of 10 n ts/blg3 av-z.ewtons can be combine to form a resultant wtv3a/z gs lb.-ith a magnitude of 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 mostp s,6*y5zuby e closely associated with Newton’s eus5 z6yy,*bp 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 the action go+sejc.6y oab2oykas* i,6m: 2l0m qforce 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 elevatoyun bggdh 3a0 dj:1*7tr is accelerating 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 thebndu31*gagtd y :jh07 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 thevs(pis ( h t).ih2a8qq 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 during the fallshivq 8ai hp. )qst(2(?

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 a40e az- ructz50yjcz, speed of 35 m/s. The batterswings and hits the ball. The magnitude ofytrc4z, zuaczje50 -0 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 sity/1y 5fwn4 huus at rest 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 forceynhwyu u45 1/f 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 Physic0yj pi0zl6 mc8t( wysuat6q.8s I class were in lab conducting an experiment related to Newton's Second Law. The coll8yl(yzi 0s6qu mpt8.w 0c t6ajected data were displayed 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 for(8 qt+-cor vi,ltb 3irce on an object were doubled while at the same time the mass of the object was hqvl totrc+ -r b(3ii,8alved,then 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 nv8j wfmw)d j .e6d97lto a speed of 20 m/sv mj l6d 9end)ww8jf.7 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 isthru.5*nz;r* hx: yp *bl )xk5aasmx p0j,yh- traveling down the road. The mass of the trailer is 4 times the mass of x )p0 * y,zhy.a;struahl 5mj-*p rbn*5x xh:kthe 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 h y *5 mhik2k(vcky;.rrx )wz.s 2txz-best explains why large tractor-trailer trucks generally accelerate much5k)tx h.2* ym2 zk-hxs r(;irvkywzc. 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 frictionless rink throws a 2 kiloghdsy4ka;f)87a 0 (ee grb9v noram ball, giving the ball a velocity of 10.0 m/s. Which statement describes the subsequent mook v heaaf8dr s(g7;0n9 eb4y)tion?

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 thibi 5v 89iuj 9ob ue9iqn il,3nk.1;fme earth with a weight of 100 newtons is accnuu9b.v 3 j9n f8 i1,kibq9l5mii;eo ielerated 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 accelehly; sz:ffuvqi+ 24/zrated from rest by a constant force of 2400 N. What ih2fvlzzf iqy 4u;s/: +s 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 speed 4.0 m/s slides acrossa * fxg3q/ivyugg9(*h a rough horizontal floor before coming to rest. The frictional force acting on the block is 3.0 gi /a3*xuvyhg*fq(g 9N. 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 initi2 bn1v raz4 tod63f()cnrppos h8vl,7al velocity 4.0 m/s slides 8.0 m across a rough horizon an8lo4t br(,fpspd2z hco)36vnv17rtal 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 ps:e+qxavuz i 16*-q rremains at rest on a horizontal surface while a person pushes directly to the right on the box with a force * ze6psa 1+r:qixuv q-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 moving at 8 m/s accelerates uniformly to res6a8z av3i j(zio/ jzb9t on a horizontal surface. The block travels a distance of 12.0 m during the slide. Which one of the following choices besv9zb /oajz(i3 8 jz6ait 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 pat81oojy4w z ,*bgy;pzkch 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 .g;oyzj,k w*z18 py4bo
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 f+at3rz,*lxclz35l l slides across a patch of ice at a speed v with its brakes locked. It then hits dry pavement and skids to aa33x5lzt+f ,ll*lzcr 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 car makes an emergency stop by slame: )b 8*hzj*zfpdks7qming on the car's brakes and skidding to a stop. How far would the car have skidded if it had been traveling twice as fast?pzq *fd bj:sk7)8*zhe

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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 follo(69vqsi*bs0q 0i9 z ;7b /hm qszlzjxz7xzs*r wing devices. Which of these devices can cause an acceleration in a moving carmqxzbqi9z97q *s*l j7hi0sz0 xbz;s s(v/ z6r ?
(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 15000 newtons is 240e c0k-4;b/0 cm8ebcdo/mw mg h00 newtons. About how much time is needed to increase the rocket ’ speed from 12 m/s to 36 m/ 0-h/edmb/ ekcgc08wbc4om 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 uz1 vt+5rh oks7ys3m( 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 as large as the force T. Given that there is friction f and the box accelerates to the right, ranko5rvs h3s(zty7u 1 km+ 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 bel ;/+y 1cwon *-yqo0d) knsdlsdow shows 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 fwdl/-yno)coskdd 1 qy ;+n*s0rictionlessly 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 sjjjlg g.6i/96fqivk+ hows 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 frictionleq.g gij jfl/v9 +6kji6ssly 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 frict nnfekh/m(6+k.m+x5lnr) mae ionlessly along the curved track from point A to point C under the influence of gravity. What would be the direction of the cart's accelerati5kkn+e mnn6ahlme )/+f mx( r.on 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 the floor by a rope which ma h0v1wfqas/n6 kes an angle of 300 with the horizontal. Which of the following would be closest to the coeff 1/6fq0avn wshicient 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 fo(y-vwa.cg 2 ax, ugcmvp-tf((rce as shown. Thecoefficient of kinetic friction is 0.30 while the coefficient of static friction is 0.50. W tpwa-((g.u2- vvfm,(cagx cyhat 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 of grassaq;6a ziw (5pa jb3;n nq/fa1f 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 vbn(w1aq q a z3;a 6f/a;jfpn5iarious 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 moving. Whichmbu a6:(wftsn5pv.a9 of the followimf9uast v5p.b n (6a:wng statements 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 pun6qt3v3aoe: r lled up 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 speedup the hil6q3v :atrn3oe l?

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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