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 velocity i4 5-uf 45 7z-qkbx(lqke txmhas 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 thefzxot +nh/uzz76x .+u quantity of matter presezx/t.uz f oh+znu 6x+7nt. 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 oq,r n)3a;lj;p q fei5hn the surface of the Earth. Assume the Earth has mass if hlea3p;;r5 ,jn)qq $5.98 \times 10^{24} \; kg$ 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 x -t buij- ;9aeyv1d9ofree fall near the surface of the Earth. What is the magnitude of the gravitational forci;jdu -9t a1voeb-xy9e 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 increats yr68g1tpb,itu0d. zr lcv(+zl (1sse while its acceleration decreaset(cb ,0rzv.l 8z 1l1gip+u dtt6s(ryss?

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 i (xzo8 5tcud8+uryy;point in its motion, the direction of the particle’s momentum is +ui 5 xtydz8u (rc;y8oALWAYS

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 rp p 0w;vt3)zua string held by a person. The person pulls on the string uniformly accelerating the block upward for a short time. During this time, whic)t0pr3;u zwpv h 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 r5zs5 urc 0u(ffwq6w iq/j5n7situations is the net force constantly zero on wfs(6ic q/f7r0nuz 5 j5rw5quthe 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 t)if 7to3d4oqpm 6; yrgo 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? Thp67 o)dq4o 3frm;tgiye 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 equilibr9j: ..v xwk(y.dh ,gpzq7iheuium has three forces, F1 of 30 N, F2 of 50 N, and F3 of 70 N, acting on it. The magnitude of the resultanti7 .djhk u( .hew,z gy.:pxv9q 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 fh 4-z f)brvyjc9)*fr4fzi/mgorce of 10 newtons can be combine to form a resultant with a magnitude of which of the-f zfg)myrb*44 9f hczriv)j/ 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 Ne7qvnk 18or-;4m 1hemy.cz tz6l,jkp twton’s Third La zomnye8 lrkttm zq7.-11,jc;6h vp4k w 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 actcmgl a)v g4+ w /boxpp;yft0.+ion 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 4imk l:6v2 wvft-k uh 5cgcgos1q7n85 the floor of an elevator. The elevator is accelerating upward. Which one of the following choices best represents the Newton’s Ttg fuw 5 c:641vc-vlh27oqm sgkkn8i5hird 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 ow+c s23 xfzqz33obx5 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 the skydiver during the5z3z 3qx3x+f2c ws obo 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 b4qbkn x-0*o )7qy)dlgrqzm4 n y a pitcher with a speed of 35 m/s. The batterswings and hits the ball. The magnitude of the force that d)*y q ) rqz40-nblognkq4x7mthe 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 calculatfjf6t20t- .f26 qdtwoj7 ffbnor, also at rest. Which one of the following choices is the Newton’s Third Law pair force tffj qobtn2 f67f t-2ftwd0j.6 o 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 Phy6m,xl1v +c yiro ww f)6/czv+ysics I class were in lab conducting an experiment related to Newton's Second Law. The collected data were displayed on the graph am wfril+1vyoz,+ wvxc)/6cy 6t 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 the same time tmihh4h6uouo cbp7az 06 q4,1nhe mass of the object was halved,then the acceh4c6u4 7qpa0bz imo1, hon6huleration 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 w/u gr,h aurp: 43y.ynt j1m.fkg is accelerated uniformly from rest to a speed of 20 m/s in 10s. The magnitude of the net fo uj/ n,ht pr1ug4yrw m3y:..farce 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 z- mwfql4u qg h74g/i2mass of the trailer is 4 times the mass of the tractor. If the tractor ac7 uih/ 2zqwqlmf- g4g4celerates 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 best explains why large trac,1.nh ux)bnwitor-trailer trucks generally acce w.,uhi xnn)1blerate 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 frictionlesddk6:/ n3- jr05p te nl(pq patx b7cywtac0(.s rink throws a 2 kilogram ball, giving the ball a velocity of 10.0 m/s. Which ert6ax(bn03d/j.cd p( q- lywtn0tac5 pk7:p 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 the earth with a weightknp ;fh :m0ct3q kwzrmm(7d+ 0 of 100 newtons is acwmmm7 hcd(p 0ft03;kzn :+qrkcelerated 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 kgtxho x1qjtervo k5(*30w4a z 6 is accelerated from rest by a constant force of 2400 N. What is the speed of the car 8.0 s after beginnijvt ztehk 1qoo5wx40(*6xr3a ng?

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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 w vpt;9gl:dl jjj8zj*)ith initial speed 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 fa;)djg:l jvp8l* t9jzj r 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 mjghn;(hein+g xp m8: 2/s slides 8.0 m across a rough horizontal floor before coming to rest. The coefficient of friction is:eh2ip(; hnn:g8xj + gm

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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 e hhve) *h53v9olid6hrest on a horizontal surface while a person pushes directly to the right on the box with a force of 60N. The coefficient of kinetic friction between the box and the surface is 9hvh)h6he *v deol5i3$\mu_k$ = 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 * di29:oe3 qmlubf7bruniformly to 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 friction between the surffuo3ib:9qrbel md7 *2ace 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 patchem -u76a jllu7 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 b-7lmua6l7uej etween 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 i ocn yr8pb9*-g20gb-1fxqm r 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 frb28gb-r x-9*mr1o cgyfnp 0i qiction 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 slamming on the9z ;pc+nwrp(yo )h iu0 car's brakes and skidding to a stop. Hopyrph; oi) uw+9nz(0cw 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 each s,m2 z./pxg ghob kqf(:4t mm84e8hxtof the following devices. Which of these devices can 4: qx m8kethmphf/82ms(x4 g t ,gz.obcause 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 w 7-fvqngj6t9ki,1 fv with a weight of 15000 newtons is 24000 newtons. About how much time is newn7qf v9vgt,fk6 1 ji-eded 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 called Ted mdcl*hje 5lv:ui7p5c3j.sx 8exerts 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 the35v8csj hlldj x m7cpe5*:u. ire 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 belo omg )q2pqetuh7-z;ux(bqm2 0w shows three roller coaster tracks of equal length. Assume that on all tracks the roller coaster carts start from rest at xmqh27 q-bq)g0(peum t o2u ;zthe 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 showsp 6 4l 5duqrd/wdrh33y three roller coaster tracks of equal length. Assume that on all tracks the roller coaster carts start from rest at the same elevation and moves fr5dyq3 43/d w h6prlrduictionlessly 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 c1+ crh4 wicx8b4xh2 lgwzz3)wurved track from point A to point C under the influence of wwrx34z)h wc b8lh x+42zig1cgravity. 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 a rope which mns+;cntme jt e8c i:wk,bb.u; dlrd l,2df- :4ak:,ud2 l: cdf et+c;t8db k-e,wm;nbnjsil4 .res 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 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 againw7ra .a oq0e+ist a wall by a 100 N force as shown. Thecoefficient of kin+ia7oar0q . weetic 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 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 horizontal patch of gra xe4piq :cr5(hl9h h9qss with a constant speed by applying a force P. The arro4l9rq59 p(hxc :hqhiews 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 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 e,4ch1z2: 7 yr/o6ba ffgrs dzon a table. Neither is moving. Which of the following statements concerning this situation ,4e:7/yrzzfdcrfba hs 2 6go1is 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 sx0;ng;wfjj zji ,2c7on 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 for the crate’s increase in speedup t xc,2n wgj;;fj0s jzi7he 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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