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 u vwxhy14n8/cc c ;h:ninertia of an object when its 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 onevd(7 mgi 8qwvt+zt+ai x462 nj that does not depend on the quantity of matter present. Which of the following properties is m2vg(t+w6+xv n 4q7jid 8tiazNOT 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 Eartv 0piqbb3 4mb5h. Assume the Earth has mass ib 03m45vb bqp $5.98 \times 10^{24} \; kg$ 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#

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09.12: A 5.0 kg sphere is in free fall near the surface of the Earqbhl3 e 101xt. l.vuls/ eszw+th. What is the magnitude of the gravitational force v+w11ltesusz..x h/bql l3e 0acting 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 possibl.bh a8jjtg p;uwv(qe3z0 k)w5e for an object’s velocity to increase while its acceleration 0 w5q(ug jve kwza);pbjh.3t 8decreases?

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 2tl x2jc2jg*4hux 0wqmotion. At every point in its motion, the direction of the particle’s momentu2 hctj0x4xgq *22wjl um 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 iw9d1o*b( c ;8f42geb38(kmzgu tlk7y qr josv n 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 pair force to the f*bkevzfu mgr472;yq 8o3w k9ogtl8 c(s jb (1dorce 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 th- ynns*5ytz;pos 2 am)e net force constantly zero on th*y2amsnp)- to nzy;5s e 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 fallglq w ;rlgbq0s nqg aw08tz*0ue2;t2 ; 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 acceleration is a agb;2znw a;8qrgw;20e* sg0ltq u0 tqlnd 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 50 N, a y3x6ngx((ywupt8f 3xxxsxj k2m, t94nd F3 of 70 N, acting on it. The magnitude of the resxygx, nt(spk3w43xuxt8y x m6j2f(9xultant 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 Neg +-3 9ondqfflwtons and a force of 10 newtons can be combine to form a resultant with a magnitude of which o-9f n+3oldf gqf 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 clos6i qfr 10ssh7yely associated with Newton’s Thiiyq170frs 6hsrd 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 acti5v9uiav-y02 a-psvep w:d (vgkh8vw )on 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 an elevator. The e43cdbgi8 ,adbfc 7ww7levator is accelerating upward. Which one of the following choici8dd,3 a7 wcw4fbcb7ges best represents the Newton’s Third 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 w) xm/hsi rfm s3t2 21ymkje+4v)s fof;ith constant speed. Which one of the following choices correctly describes the Ny1j24s )oftfvm2f xike mhrm ) /s+;s3ewton’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 witml2jx*r4 n1aw fg1cl*h a speed of 35 m/s. The batterswings and hits the ball. The magnitude ow1*r*g42nfaj1 m xlc lf 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 is a c d6m,lt)c.u zdalculator, also a)cmzdd,u 6.t lt rest. Which one of the following choices 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 Physics I class were in lab conducting an experime0q dvgdbl /: uof2*5cg(u(ygf(nh j vb3 ,8cqgnt related to Newton's Second Law. The collected data were displayed on ugg:fj*q(ldgg(8 b(/,vydqb c53 n cf2h0uv othe 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 foy.g. 5l4 cgmvrrce on an object were doubled while at the same time the mass of the obj vrg5m lg4.y.cect 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 accelera.ox woa88pou j-ihb:i: a 2;ycted uniformly from rest to a speed of 20 m/s in w bj;uo:ocxii8yo:. ap a8-2h 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+v/s z n6ic.yp is traveling down the road. The mass of the trailer is 4 times the mass o syvc+n.p /i6zf the 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 prinn06. dse7 qptdj.0msb ciples best explains why large tractor-trailer trucks generallyt . b0n6mjdsqes0d 7.p 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 frictionet8a vhw3 byp0cw.t+.less rink throws a 2 kilogram ball, giving the ball a velocity of 10.0 m/s. Which stah0wy w tb8tp. 3ac+ve.tement 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 ntru ofpd*jps)4l kt8w )x8xk q -97h-surface of the earth with a weight of 100 newtons is acceleratpo 49rpwj-ktqnu*-78d kth8lx)s )fx ed 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 accepgnv9+bcto );8gm mdq(,nq t dabq6+:mr6ma0lerated from rest by a constant force of 2400 N. What is the speed of the car 8.0 s after be qd 0cqm9 +obg+nnq6gat8 dvtmra ,p)m(;6b: mginning?

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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 dc6 z8lhn2e zb;( p9cc0(ilfg 4.0 m/s slides across a rough horizontal floor before coming to rest. The frictional force acting on the block is 3.0 N. How far dopd(f;0c hbnz clc92ei6(g8z les 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 slides 8.0 m across a rough horizu *(tk5.tifbg +e3tvcontal floor before coming to rest. The coefficient of frictiovi tfu tct+.b 3*g5ek(n 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 resto2( +erxyjxko2ks81-o sue5i x4;)oyn3yasl on a horizontal surface while a person pushes directly to the right on the b2+s1x523un)( ;-e oeaky8s io4sxoojx lrkyyox 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 movin+.v ):frqfbuii07u9 ijtq+x g g at 8 m/s accelerates uniformly to rest on a horizontal surface. The block travels a distance of 12.0 m during the slide. Which one of the foluifr.j70t bqq+) f g9i:vi +uxlowing 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 slidee evro5qoj,or 2(oe 6;s across a patch of ice at a speed v with its brakes locked. It then hits 2 v(rroeq ,5;oo6 eeojdry 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 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 af ghmhp0c)f8 k, 3qh)j speed v with its brakes locked. It then hits dry pavement and skids to a stop in a distanced. The coefficient of kinhqhc 3m8)j p,gf)0h fketic 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 a6 /s4m 2u ngr.joj hg7,vyo;uzn emergency stop by slamming on the car's brakes and skidding to a stop. How / szu2o yvh mrog;j74g,jn u.6far 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 automs(uyqhxkpd 3 *jt6z7)obile must carefully control each of the following devices. Which of these devices can cause an acceleration in a moving dsp)u7x* q j3hz6k yt(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 1500zdi m (9px-dm 8d0do*hzca-l50 newtons is 24000 newtons. dmx izlz8d0- hp-* d9ca5d mo(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?

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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 cx oal3+ 6ncp7nalled Ted exerts a f lpo3a 7cn6x+norce 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, 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 rollert;uxx(,vq-o. t ep j5o coaster tracks of equal length. Assuxoqjt, (5-vpou x;. etme that on all tracks 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. Asv2ptdi j.j:mixlvh-p-rm ,r qh8:) 7 dsume that on all tracks the roller coaster carts start from rest at the same elevation and -7x2 v,vdtr8 ) ph.l -q:i:drmjihpjmmoves 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 t chr;x+w2uk1irack from point A to point C under the influence of gravity. What wikc2wr1h ;+u xould 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 dragged across the floor by a rope *pnh g+z)e:youc(y1 e3tyz6pwhich 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 ipec6g z e( *pz)htn+:3oyy 1uys 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 i3rdz q z-p6-t twxv26bs pushed against a wall by a 100 N force as shown. Thecoefficient of kinetic friction is 0.30 while the c2prt z36-x6 zv wtq-dboefficient 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 hodz,tb 9pc 3l4krizontal 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 lawn mower. Which of the following relations among the various force magnitude,c pltk493zbds, 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. Nnp qyas2 pmi9vx(mp ;g 55xk*5either is moving. Which of the following statements concergakxi(smy 5*xp9vp 5m;5 q np2ning 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 +ma;+xprpryukbe) z/4i3u.brest on a sleigh as the sleigh is pulled up a hill with an increasing speed. The crate is not fastened down to the sleigh. What force is responsible )3b.izba x4;m+/pu+ r kuperyfor 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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