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 velt-8znv ma/-ro pq;yk8ocity 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 p2tvx(jd 16xy not depend on the quantity of matter present. Which of the following properties is NOT an inpty2v(d jx1 6xtrinsic 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 32r0e;xyhc jcq9gx.d surface of the Earth. Assume the Earth has maxjhd 9.;gccq re2y3 0xss $5.98 \times 10^{24} \; kg$ 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 surfacg 3iz4,fll (rje of the Earth. What is the magnitude of the,rl j(fzig34l gravitational 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’lxdu t7m)8* rgs velocity to increase while its acceleration decrea*m)87gl utrdx ses?

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 every point inpd/w fst/lcxlv )./6z its motion, the direction of the particle’s mdtfvzlc s/) /p/ x.6lwomentum 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 thyaj8/1h pd pc9e end of a string held by a person. The person pulls on the strinhd/j918 c apypg 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 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 force constantivbo+ jame+b bn5; m64t dwx+:0ed-knly zero on the+ wain6mjbn:k;v+t dd-mb4xb + eeo50 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 to t 1boev:qaim .k ;(cs(dhe ground. A person intervenes and slows the object uniformly to rest. Which one of the following statements must be true about the a vebd. (:; 1simqok(cmagnitude 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 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 thpk mi94 3trc7eree forces, F1 of 30 N, F2 of 50 N, and F3 of 70 N, acting on it. The magnitude of the resultant ofF1 and 4p i397etckrmF2 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 (tilny+)pf-rezh1u )1d fzp67z6vum be combine to form a resultant with a magnitude of which of thef6 )n6etd 17vyuimhzz+p -) fl(1zu pr 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 most closely associatns3c3qfafcl8q y 3-z:/ ,ke dmed with Newton’s Third Law of Moyn3fc l,83 adsq3-fek /mczq:tion?

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 forcez(dgp x; 1 cgitj,h0/ bbe,:mi 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 acc( 9bx6d sajalp u(t12n:mo h.welerating upward. Which one of the following choices best represents the Newton’s 9:1. xulbdh2(a 6w(p jmaot snThird 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 downward through the air + qzt4w/*iyi h;1peimwith constant speed. Which one of the following choices correctly describes the Newton’s Third Law pair force to the air re mz+q;p1 tyh e*4i/iiwsistance 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. e1/rsl3a9v u)k ql1nu ktl5i) The batterswings and hits the bal113 urliunk 9)l/)k5avq ltesl. The 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 table. On top of the book ds w6z9z af iusv:+ zqp6b(1/wis a calculator, also at rest. Which one of the following choices is the Newton’s Third Law pair force to the fv69 s +i(dwz1z pq/auf:b 6szworce 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 were in lab conducting +xc( kuc/ob+.a5k x jfan experiment related to Newton'sx/5xcu o afkbckj .++( Second Law. The collected 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 force on an object were doubled while at txs3 d0ssfpph alol ;l;l2:*1o he same time the mass of thed;fh2s:3pl; lx* osl losp01a object was halved,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 mali2ahvg( /ej*(8 qeat ss is 1500 kg is accelerated uniformly from rest to a speed of 20 m/s in 10s. The magnitude of the net f*/eev lataq(2gh( i j8orce 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-trailerbw4f/skj k/xy4) u7br:. dt :/hezddi truck is traveling down the road. The mass of the trailer is 4 times the mass of the tractor. If the tractor accelbuy tbd:4 7jhw/ :ier/.kxkfs dz)4d/erates 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 vc74 *g5 fphj f)bl*caprinciples best explains why large tractor-trailer trucks generally accelerate much more slolcbg hf cva)5 j*p47*fwly 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 thr3kjq6u*g *hvg ows a 2 kilogram ball, giving the ball a velocity of 10k *6q3vg ugj*h.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 themjnqw,vwzp*:t( t 98l surface of the earth with a weight of 100 newtons is accelerated wjnvmqzp9*8wl: ( ,tt 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 accelera1wg(e2 * eo+zzk6 bajwted from rest by a constant force of 2400 N. What is the speed g *k zzaj(eo1bew6+w2 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 hb j5qnymd ea(0f96 2o;)dctzsd 4 o.xmorizontal floor before coming to res4z2t9j om ad0)debc6f qx(.sonmy;d5t. The frictional force 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 inits.e9.:kau zc8uzoj55)xt ahr/ obc3oial velocity 4.0 m/s slides 8.0 m across a rough horizontal floor before coming to rest. Tao.395ros hzbux :ez5j)catko c 8u./he 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 resphtapu6djl6zl9h :fa 7n ,w 1rnh+x3 7t on a horizontal surface while a person pushes directly to the right on the box w: 7h6puwj r , za+dxhh16t3lnpfal9n7ith 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 moving at 8 m/s accelerates uniformly 4vx, 22l+i yxtmkg 2dwto 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 fri224 kg2,yxxmltdwiv+ ction 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 brakea g))ycxzs68d; n1kiiqcm7 x :s locked. It then hits dry pavement and skids to a stop in a di )xcs7ni 1;ic8 m6d:kyqz)gxastanced. 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 across a pa htt)y vle, rvu/0;kdwby3 68vtch of ice at a speed v with its brakes locked. r 0 ,) t8 vuyb;dh/vvyt36lkweIt 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 .

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 n+5d3(4 hfai eoyc(vxslamming on the car's brakes and skiddi +y c xh5vf4ea((ion3dng 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 e9 eb /3anjpw agsq+3o(ach of the following devices. Wh +bgsa9qo /3p(anwj3e ich 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 i;rhz 35 1nq/neaa cr*k: l2to15000 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 takeoff?rcoh1z qna;n 5/at3:e2kl ir*

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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 ck4 nl:(sjky8 oalled Ted exerts a force T to the right on the box. A person called Mario exerts a force M to the lef sl(k4j8 yk:ont, 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 equal ln x,ej6bu4 r3yength. Assume that on all trub3y6jexr,4n acks the 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 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 equal length. Assuzej7b yc(cp -uesc*4 8me that on all tracks the roller coaster carts start from rest at the same elevation and moves fri4bcy cpe7(8z cs- eju*ctionlessly 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 carjy+d:h- :t-q ldea6k itrolls frictionlessly along the curved track from point A to point C under the influence of gravity. What would be the direction of the cart's accelylidate: kh+d -- 6:qjeration 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 ae 3x-1rofny,1w chm b; rope which makes an angle of 300 with the horizontal. Which of th- o1he,n cbr ;fyxmw31e 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 N fo ;,t*sry85jrx/uk )a6 drhay zrce 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 of 1 serth) ,6ra zxjdy*s;5/r ak 8uycond?

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 horizontalr1 qo 6:0kwtfl patch of grass 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 onwq0o1 klf 6tr: 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.my;zen* lmjc2 ) t1ck/ Neither is moving. Which of the following statements concerning this situation is CORR /tm jml2kncc)ez ;1y*ECT?

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 asguu v/jz;e6:bm -qbkto0uzu uc:l;98 the sleigh is pulled up a hill with an increasing speed. The crate is not fastened down to the 60q/zbuu ;- : gcjb kuezvlu;ut8o9:msleigh. 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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