Newton’s law of motion - 题库网 (tiku.one)

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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 objaq9 9ui+56ceeqthh k2ect 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 m- g-ssi v9b:e(xjty2 ka 9nz,property of matter is one that does not depend on the quantity of matter present. Wh:2,a(j zt-k bysx9-nmgi vs9e ich 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 surf d+4aj/u ho,9zvq0q3 d fhj y.5(nislkgy;o(lace of the Earth. Assume the Earth has massnj (+qk0(fzijouq s4.gy ly;ah/5vlo,3 9ddh $5.98 \times 10^{24} \; kg$ 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 n suwr5jla ).;vear the surface of the Earth. What is the magnitude of the gra5 js.u) wra;vlvitational 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 y;*583dmenyo d9 9 0owf i;clxcgt0oa increase while its acceleration decrcnd;05ot8 xyom 9 ce d gfyaw;0il9o*3eases?

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 3+ m 7jocbtak-xkvod,x4w 05d motion. At every point in its motion, the direction of the particle’s momenw,m 54x3-kv0o dca7k d +xotjbtum 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 ofrh1 i9k00/pag tkwb.vumf3r. 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 force of the string on twag/uv ifr 0.bkrk. mt31p90h he 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 csqye u+y)d +c08d+ 6nnxuvc 9c7ypn(fonstantly zero on the objec(+n)d0c y+ucy8 7uqncy 9pne+sdf6x vt?

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 person intervenes an/i06p y gz8jfkhvqycq*.0sj8 d slows thyp0 cj6 qzv/yf8j0.qki8g* sh e 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 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, and Fg) (uq a9u3sfu3 of 70 N, acting ou3)g (qsa9fuun it. The magnitude 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 of 10 newtonp0d b6ug k.;exs can be combine to form a resugk x0u6pb;.ed ltant 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 state mbw /snp(c0*aments is most closely associated with Newton’s T swbcpmn*a/0 (hird 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 ac ufnjm/v7a6fkc 8v )4ytion 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 elevator is acceleratig gwf52pvv u9h .w3lu5ng upward. Which one of the following choices best represents the Newton’s Third Law pair for5pwulggw9h 5vuvf .32ce 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 downwars67)lot k uo0zd through the 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 6u)7 tkoz0slo 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 spe9a c 2q0e,jxqyed of 35 m/s. The batterswings and hits the ball. The magnitude of the force that the ball exerts on the bat is alway 0 qjeycx2q,9as

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.wbhz ey rns+k udb.9lr *n4;3(qr1di a table. On top of the book is a calculator, also at rest.u;(.r9*1n+rl wbesnd4 i rb3z h.ydkq 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 conducte9:,v wdg0ynjlbe p)4ing an experiment related to Newton's Second Law. The collected data were displayed on the graph at the right. From this graph, what conclusions can the students maepnwle )9, :g j4yb0dvke?

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 opupv coc2kdcpq+7wx7 -z2 *7k a2hw-cn an object were doubled while at the same time the mass of the object was hakd7-7ccvcxw2q k7ppouz+2 *aw ch2p-lved,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 to a spekn jx1pw-r c1ghv( i9(ed of 20 m/s in 10s. The magnitude of tpik (hjxw(9grn 1c1 -vhe 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 is traveling down the road. The mass of9ahc3fslqz9 c rg0u8 7m/c2 fw the trailer is 4 times the mass of the tractor. If the tractorm gfc9a0 8l3rsq uf2h c97/zwc 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 8tre2.5t s 5edpgkzk0l42xybfollowing principles best explains why large tractor-trailer trucks generally accelerate mu 4dyx8g5zteprt5. l0kb2sek2 ch 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 f20byrqd9 ch;g gj oz/0; 6phulrictionless rink throws a 2 kilogram ball, giving the ball0hqg9pdzg/y 0 u2clbho 6;r ;j a 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 surface of).rlb0m28rcfa7n8 7 jzifbh u the earth with a weight of 100 newtons is acceleratedcbn8z f.87r70 amlr)2ih ju bf 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 accelerated from rest by a constant g f,701l kkrgyforce of 2400 N. What is the speed of the car 8.0 s after beginl,0kkg1 y7r gfning?

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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 initialf mkv yeh+jj/3z29*y s speed 4.0 m/s slides across a rough horizontal floor before coming to rest. The frictional force acting on the block is y fkmys3e zj9/*2v +hj3.0 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 slides 8.0 m across a rough llb)vvjzhei/nfy (f( t 0u)w y/l3 ::phorizontal floor before comifi0y u/:evyl(j f p/z)vl (htl) :wbn3ng 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 aqznpj):ays gwn:9 l *5 horizontal surface while a person pushes directly to the right on the box with a force of 60N. The coefficient of kinetic fricti5gjwl :asy* :qn9z)p non 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 q2pt mhy6h6; o3a3bhamoving at 8 m/s accelerates uniformly to rest on a hori 2 yhapom3bq66hh;ta3zontal 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 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 hfhp 88wbv*m)at a speed v with its brakes locked. It then hits dry pah8vpw m 8)b*hfvement 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 a speed v w.or3xth:gdw).i u,jw ith its brakes locked. It then hits dry pavement and skids to a stop in a distanc:w. .w ut goh)i3,djxred. 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 ca+d(x jvz7su:(h e 2sybr 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 travej2y(7 +uevszb :s dx(hling 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 thq0zrvf 5oc54 7zc5n d7)s y.x khbkmn+e following devices. Which of these devices can cause an acced n0y)x 7qk hv5ckm+rn7.fo4zb z5 s5cleration 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 :ubzm0ca ykp+p vd;o,b g/h00weight of 15000 newtons is 24000 newtons. About how much time is needed to increase the roa z+;0cmhb0 d:u,y/g obv0ppk cket ’ 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 horizo,xluq kg1b b1of 5s,a6ntal 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, rank the sizes of,ku6f1x 5,gl1qao s bb 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 bzq.3z0,y 5pu(;2ajka ozthl s:a ax;w elow shows three roller coaster tracks of equal length. Assume that on all tracks the roller coaster carts start from;szaxl5q3az zuy(a2k tw., ;j o:0 ahp 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 coacwru4 4p4spr;ster tracks of equal length. Assume that on all tracks the roller coaster carts start from rest p4wpsc4rru 4 ;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 frictionlessly along th2g h1a5t n7kvj97uxzge curved track from point A to point C under the influence ok5gz7tn h ju9ga2x1v7f 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 dragged across the floor by g,wb:vlls- 1sa rope which makes an angle of 300 with the horizontal. Which of theb-, s:s1v lwlg 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 initnbtognc0e4us6 ., .iuially at rest is pushed against a wall by a 100 N force 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 e gu,bnt o.6n0s4.ci uof 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 horiz ryt1jhji-2l/ptvvxisfpsu - (7/1n5ontal 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 follo j plj51f r/vit(pu17iy/--vnt sh2s xwing 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. Neither is moving. wvtux(g**se/4 li3 kwWhich of the following statements wwu3g/vs*l4 k x(tei* 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 s:hq) ad5pvi:r leigh is pulled 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 t :h:qa5pdi)rv he 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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