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 ve0.0gm lbov-cclocity 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 doemut))wn -tuhe / 8xm)zs not depend on the quantity of matter present. Which of the)th8uxm/z)tmw-u e n) 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 t u 5jdx)fym4av2uv7em; l0)f qhe surface of the Earth. Assume the Earth has mass f4m)fx dj7 ;2v0el5qa myvu u) $5.98 \times 10^{24} \; kg$ 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 ispqb )v/z/u f9 6ew2pvs the magnivfz/ wbpv6 s)u9e /2pqtude of the 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’s velocity to increase while its acceler; jc8/w -k8uxhdhqeacc ;r ku;.n0 b*cation hw 8/-jkcua;eh q d;c.bc0kx;*cr8n udecreases?

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 undergoesb3;pm*q tb6z zz.beh0 erratic motion. At every point in its motion, t* e.qzm;bhbzt0 3p6bzhe 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 suspen nn8 rfmn1j; lfo;3sfvoe 4/l.v,qk4dded 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 the Newton’s Third Law f s84;nv o .q/nk4ro flfmjel1d v,;3npair 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 const;z,n )foxi q9qantly zero on th)qz; ,xio qf9ne 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 1qp rr)baid6/close to the ground. A person intervenes and slows the object uniformly to rest. Which one of the following statements must be true dr6)pb a/q1 riabout 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 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 equtgiozp(v9 lu68c ,; giilibrium has three forces, F1 of 30 N, F2 of 50 N, and F3 of 70 N, acting on it. The magng t6i pvi(gl,8 ;cuz9oitude 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 force omg9w3fmhfo.(u,)8zn -jzhun8t wvn,f 10 newtons can be combine to form a resultant with a magnitude ofh ju ,fwm8g9)vf( ownz .n t8uh3m-z,n 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 closely associated with Nep);eescrxar ;. yw-jqp5v 1 m5wton’s Third Lawm r rw-qp xjvy1.;paec5 ;5es) 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 beb(mx )g m;)grccause:

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 v 3t1f07lgwi xg5;1b1een vvvelevator is accelerating upward. Which one of the following choices best represents the Newton’s Third Law pair force to the gravitational force acting on 37;e vvgt5xgl 1 vb1i0fvw1n ethe 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 with cons. br/ f0le,tdvtant speed. Which one of the following choices correctly describes the Newtonelb,/f0 .vrtd’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 throiebri 6+v5)gk2 o1bthcbh0 u4 ts;:bh wn by a pitcher with a speed of 35 m/s. The batterswings and hits the ball. The magnitude of the force that the ball exerts b b25b0c;hge4v)+iruhsit 6 : bk oht1on 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 ofi*6vyntq o;l76(2p 6ei gvgt6su.wic the book is a calculator, also at rest. Which one of the following choices is the Newton’s Third Law pair force to the force g 6q7t s2p6i.( nevl6i*y;tuogcvw6 i 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 clq9m1nfrh *tttsu :u/ch *- ynw:cp47c ass were in lab conducting an experiment related to Newton's Second Law. The /9w:r tsfu1uqcp*h *-:tm cyhtn4cn7 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 werey 5dauoml0u sv692 xz* doubled while at the same time the mass of the object was halved,then the acceleration of the objec ux9om0ds562z* vy alut 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 tun q x/y,k3)dykzgne-.1f9n-j zpd+ io a speed of 20 m/s in 10s. The magnitude of the net force accelerating the car+/iqd9.1fpkn)n ky ,j -n3u-xyze d gz 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 trbs* x+ uz:7 ). aj0puv7ei-okrmwp.vtailer is 4 times the mass of the tractor. If the tractor u wr7 :)uvj p-.iem*bstkv. o0+p7zaxaccelerates 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 besi +)s bn) 0y i hy1rf,5xqg;u*u43ttmzmcwtp0t explains why large tractor-trailer truchqt m0i pwu ctg31my;x,) f)i +0r4zns5uy*tbks generally 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: e/t*elgn.e hun+c +v frictionless rink throws a 2 kilogram ball, giving the ball a velocity of 10.0 m/s. Which statemeneec+lh.vgeu*+ n t n/:t 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 wi,7s v)wuy;r .,glnne wu 0j3jolv7.+pqz c4ehth a weight of 100 newtons is acceleratepj+7w4h)n;vq ,3vsjnu ucy, lwe rl g..o07zed 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 mase6p2 -t w b/+qqtsc,vfs is 1200 kg is accelerated from rest by a constant force of 2400 N. What is the speed of the car 8.0 s afterf2/wp, 6qe c -qs+tbvt 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 slidesq ( ix:q(ekgd, across a rough horizontal fgdkq,:x(qei (loor 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 initialf:c9dzj;/m d aq0cx+b velocity 4.0 m/s slides 8.0 m across a rough horizontal floor befo+j 0 9baxdm;qc/cd:fz re 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 2v;5nzvmks rmg9.0u) (a ga pnsurface while a person pushes direc.g nz(vmsg;a 5upk9ram0) vn 2tly 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 moving at 8 m/s accelerates uniformly to rest on a qqn7 24p8by1 oxzu: rthorizontal surface. The block travels a distance of 12.0 m during the slide. Which one 8n4: zr u1qy7otqbp2 xof 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 across a patch of ice at a speed v with its b;cnb6gva jawiu0c(7 ;o6 n8rkrakes locked. It then hits dry pavement and skids to a stop in a distanced. The coefficient of kineb( nck cna 6;war;6j0ugv 78oitic 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 abr ldp2 6x-.4o;ah ajlcross 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 -apdl2 .lr;6xoahj b4the 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 / c0slp1(wuj l(zev-ca car makes 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 been travewccs jp/-(l v (ze1u0lling 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 each of the following 9in(lde1t( +)wfa-f 0qs uqr mdevices. Which of these devices can cause an acceleratfe9wnui q )f 0aq(l1d+s-r(tmion 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 rocke of+cd3ny cn1o+gt3/ipa 2n/bt 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 tandb1 ynn/g3+ft ic 2cop3+/o he 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 theucl)5rx *amxa+l-t l3qc 0yu 8 right 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 acct rc8- lylx)3*uuqa a5 0+cxlmelerates 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 coas0yq stal 4f3pgk0p7 9fter tracks of equal length. Assume that on all tracks the 9y7 gaft pk00fp4 lsq3roller 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 roz227,o pjiccp1 lw:nitm3hhw7n w, +yller coaster tracks of equal length. Assume that on all tracks the rocw7p2im +2pn7h:,zyit 3nwhloc w1j , ller 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 0ywqq/:4a,:jzfg nzhfrictionlessly along the curved track from point A to point C under the influence of gravity. What would be the direction of the c4,: gzazn/yhf wq :qj0art'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 4y-rtqr9z s: k50 kg is dragged across the floor by a rope which makes an angle of 300 with the horizontal. Which of the following wtzr:4r -q 9yskould 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 agaifsr**gr9 * yhinst a wall by a 100 N force as shown. Thecoefficient of kinetic friction is 0.3hrg*y* f9 r*si0 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 a lawn mower across a ho7ddv *xh12j,er7+:cp5 u lfws8 traklrizontal patch of grass with a constant speed by applying a force P. The arrows in the diagram correctly dxr +*7wapcse8jl5 u 12ft,rdk7:vlhindicate 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 table. Neip f;rt/bupb0,f z58 wvd. gnvov)7oi )ther is moving. Which of the following statemf,7nv).zw ; fbvbi / )0u5 8opdgvortpents 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 a+g5 b3* jthlpzt rest on a sleigh as the sleigh is pulled up a hill with an increas5j+3 hgt*zbl ping speed. The crate is not fastened down 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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