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 i aa y1: oqj3n7nx:/rea8pfgd,ts 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 property of matter is one that does not depend on the quas-ml hd57l nd2ntity of matte-5d dhn2lsm 7lr present. Which of the 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 Eartys8eywbx+/9 v0xpfv. h. Assume the Earth has mass yxv b yf/px v9s8e.w+0$5.98 \times 10^{24} \; kg$ 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 t1b)vb*wuic+vfr )g .drklp3;he Earth. What is the magnitude of the gravitationalfb1*w;ul.3 vb cg vk+rd )r)ip 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 txw3td2b1j txf(t 6g)bo increase while its acceleration decreast2 bxw1(d6x b3gjt t)fes?

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 o0fzqtgy8lrbalt./ xe +6 u8)in its motion, 6xy./8 z agl tr0elbfu)8to +qthe 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 strinu ;uabeha,b 4;6.pef- a -zmdng held by a person. The person pulls on the string uniformly accelerating the block upward for a short timemdb4eb a6-,-;.f;zu aahuepn . 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#

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07.18: In which one of the followldkn jc1pw41c(0- z .m-uoifcing situations is the net force constantly zero ofkljp c(z.wi--m c0n1 oud 4c1n the 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 wz /+,flcp6lw+5)w vg6dhhg vgou+3j 3oqv f-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 being stopped by the person? The magnitude of the object’s acceleratig 5w-v +d)q+cloz fw/g3f6o+6, hp gvuwvjh3lon 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 iede5, 1-g( gt+2u/uqiqumga 50 N, and F3 of 70 N, acting on it. The magnitude of the resultant ofF1 and Fg+etuq g2 -ii5due(gmqa 1,/u 2 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 Neog+ce l8(h u/ho,n9e qwtons and a force of 10 newtons can be combine to form a resuln(o u,qol hgehe8/+ 9ctant with 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 most closelyg/4rn kq7 fy(o associated with Newton’s Third Law /gf7ky4ro n q(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 doe hhj6hk 2a8w0* wc*hdvs 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 .8nr4vrnxok x7hi.g;an elevator. The elevator 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.kh4rox.r;7ig x 8vnn 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 downwaif k0dd0:n : o* :2ladstdfba0rd through the air with constant speed. Which one of the following choitdbaid d:0lsf2fokda:0 *n:0 ces 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. The batii5*obv 4wf j)hsyb11:jkod ; terswings and hits the ball. The m*kyob1ds)b 1 ;j if: jhwvo54iagnitude 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 b nb5 k1s3e.(8osuw4-vvc rxvrest on a table. On top of the book is a calculator, also at rest. Which one of the following choices is the Newton’svb -kw8vv s.rb5 o1 (uc3xnse4 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 Physi4slh*xgxo0aox1hsvcarb(v - ; 47 5zocs I class were in lab conducting an experiment related to Newton's Second Law. The collected data were displayed on the graph at the right. ah5s4-c gzo x xh*rvab(7x4ov;1sl 0o 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 objects /47m:; 0iaxtvhza mj were doubled while at the same time the mass of the objeci stzvm74a/a0 jh ;mx:t 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 mass is 1500 kg is accelerated uniformly from an2 dds*6l82 4 exdpzarest to a speed of 20 m/s in 10s. The magnitude of the net force accelerating the car i6 d2ad 2npa xdze8l*4ss:

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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 masiyibxl4f6:-*ifhj:w w 3 noy1 s of the trailer is 4 times the mass of the tractor. If the tractor accelerates forward, the force that the trailer applies on the tractor isyy1i3-onihf:i46*fwb wl : jx

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 followinad217j/pn g 2 zmnmb;xx2 tlh0g principles best explains why large tractor-trailer trucks generally accelerate much more slo xb 1n2a/0mg2dpljz7;x2ht nmwly 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 kilg4b n4s*nwm h2 y5cn1yogram ball, giving the ball awmnh sgnc41 y45 *2nby 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 surza0qr;x ;/qzi1c5 0l vlenwy8 face of the earth with a weight of 100 newtons is accel1 xvzl 0iqyrcla/zn 8 05qe;w;erated 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 mass4uxbv 7lwt v;) is 1200 kg is accelerated from rest by a constant force of 2400 N. What is the speedv; w4ubxt7v l) 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/mb;jfels- c9 k6tuf 5:s slides across a rough horizontal floosbte k5 69lmjc-;fu:fr before coming to rest. 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 initial velocity 4.0 m/s slide0wo*gr3.37rha y( el+l(t st,ql gqxys 8.0 m across a rough horizontal floox 3qrgeqolhlt +,(g(s lryyw ta*703. r 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 aoi -q3.3a;yhdc vdcsa ho.jqqm91*f9 person pushes directly to the right on the box with a force of 60N. The coefficient of kinetic fri * 3qoiy-h vcqa9m; 3jaqf o.9dch1d.sction 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 87. p r m)*,yflmlw982cjaltp y m/s accelerates uniformly to rest on a horizontal surface. The block travels a distance of 12.0 m durtl ym7,2jlm.l9*8fprp)ywac ing 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 massy7d xoee7 gp cx9l4u33 m slides across 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 ofpu3xcg 77eye9d4lo x 3 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 patch of ice at a speed v with its lh91.q j v+;qryhs,lcbrakes 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 rol+.hvrcs,19l qhjy; q ad 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 makesng 4s/oyo i8n 8edl-zs;idlp8 x/- ;ix an emergency stop by slamming on the car's brakes and skidding to a stop. How far would the car have skidded if it had bee ooxn s-/8l;;i48i zsy e /dlipd-8gxnn 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 r +7ser0 /z1toib4gym each of the following devices. Which of these devices can cause an acceleration in a m/m t1g4br7 0zi+ ryoseoving 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 8rll3h/ futo.a 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 tartlol3./ 8 fuhkeoff?

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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 acrmb-; 9povm1c14va6 7 axfw jkwoss 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 ov 7 p c ;9jaa61v4fb1xm-wkmwleft, 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 roll+ m4fkxvzote0kx; jmu c/ 7)h1er coaster tracks of equal length. Assume that on all tracks the roller coaster carts start from rest at t 0)xvj74mk;m1 +oktfexcz /huhe 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 coasz6(n7 prs ck+o*xp( ynter 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 tracks zy6 n so(*+pc(7rxnpk 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 rollercoa gb36e g:vrhb(ster cartrolls frictionlessly along the curved track from point A to point C under the influrb6(hgev3:b gence 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 dragge /u;(zl2ogia u krm:o-d across 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 required to move the crate at a constant speed of 20;z go-(or/2luu ma:ik 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 gz kib)92ev hy0 yos5.n9do*kat rest is pushed against a wall by a 100 N force as shown. Thecoefficient of kinetic friction9hbk0di5k*eo y2ygzvns.)o9 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 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 w/ ;af.9(e (irmn1einst:gm rdafq-; a lawn mower across a horizontal 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 on the lawnmsn:1-trm/eq id(a ffr.;w i9ean;g( 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 craf f52z q+f6v+e/c .scn* fxh-im a/wjxte on a table. Neither is moving. Which of the following statements concernin+ c fwsfc-+jhf*65 //fna.zmxvqexi2 g 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 onuzc5z t3)2gsw a sleigh as the sleigh is pulled up a hill with an increasing speed. The crate is not fastened do 5tc)w 3zu2sgzwn to the 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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