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 whesf6ia6ge jigb8;m .b6 ,ictz 8n 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 propv l:g*1y uajf;mg 0kb*3ipkwm0*5s xserty of matter is one that does not depend on the quantity of matter present. Which of the following properties i*s*f; gv w0mbyikxpua m*0j1:k5s g3l s NOT an intrinsic property?

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3#

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04.16: A 20 kg boulder rests on the surface of the Earth. Ass4u7xyy0ys k tuoj)t.+x75 au zume the Earth has m )y 7s7u+jtxukyt4y x .z5ua0oass $5.98 \times 10^{24} \; kg$ 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 suddcckc *j1) (drface of the Earth. What is the magnitude of tckdj1)(c*dc dhe 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 to9palp *dgq0i 9 increase while its acceleration decreases9i0adp l*pg q9?

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 erratkbl* lgleb, y- ho, gav)63vw3ic motion. At every point in its motion, the direw) le*bvvlo 6h,g yakb3g,l3-ction 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 s4 4(axsp+p*aoo wr h/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 co4+wahsx4ro ps* ap( /orrectly 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 situations is the net fo4pf:v g;xa befyxx9u)c g32u/rce constantly zero on the obv)f4xuxp ;y 9/fx2egb3 cu ag:ject?

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 antsjlb +(dbxdh5,p/4inb f g29d slows the objebt4 bb , pndi/d gjlf5s29(hx+ct 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 equil.gld agh8b4:ak9w /qpibrium has three forces, F1 of 30 N, F2 of 50 N, and F3 of 70a :q8w/bdgh 9.4kplga N, acting on 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 newtons )w5lvd uxr 9vt0wj6 d(can be combine to form a resultant with a magnitude ofr wd 0j(x)d9vwv6u5tl 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 co)iy+egm w9 6h2is4ap6m4m wNewton’s Third Law of M29 wmic)6mi6gsaw+eoh 44 mypotion?

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 n, gzm6(yb- jybecause:

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 floordxp0/:24b5ro6qn vexc+ wauk of an elevator. The elevator is accelerating upward. Which one of the following choices best p +x5eo2b6/nwdx0 4c rqva:ukrepresents 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 with constanucv8*0yl x u:w(w0ji qt speed. Which one of the following choices correctly descrl*j:w0i8c u uqw0 xv(yibes 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 3)kk87vaxi d i*5 m/s. The batterswings andk x8aiv*)ki7d hits the ball. The magnitude 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 rest on a table. On top of the bm/p-a9-+v2j j ijucbf ook is a calculator, also at rest. Which one of the following choices is the Newton’s Thirjma2jjivu-/ + p cf-9bd 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 exs- sp+mz0v;tm)( fjbm periment related to Newton's Second Law. The collected data were displayed on the graph at the right. From this graph, what conclusion(m)jvs+t z0p-sm;f bm s 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 werezs6hik 7kkv z,yu).4m doubled while at the same time the mass of the object was halved,then the acceleration of the obj6kz v,h.7 4u)y izkmskect 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 h(ec3*dy hvj* accelerated uniformly from rest to a speed of 20 m/s in 10s. The magnitude of the net force av 3 jhdyce(*h*ccelerating 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 the9ta2u y 8qt7 zr)j(fcx road. The mass of the trailer is 4 times the mass of the tractor. Ixa)9 y ztuj2ct( rf7q8f 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 principles beswq9ae kvc5 iy,p38daid2 hye-rdel7)6x ,sh4 t explains why large tractor-trailer trucks generally accelerate much more slowly thae-3q7 eaal,xwcypei 2h dd9hvs) 4ky,d865rit 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 frictionleszh- 69wlk*:yim xh,tqs rink throws a 2 kilogram ba q zm:6hx-*y9t ilwh,kll, giving the ball 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 the earth with a weight )l+i*ec+n1 tejz f 0sudd87 f92kxdacof 100 newtons is accesde0ti+d8x l*+z217f) 9u cn jfackedlerated 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 force+a q9dor1ylz krh-np7 nx42)vyint 01 of 2400 N. Wdnvi hty90k1o)nynx +z1p lq7ar2 4r-hat is the speed 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 i g+-hs6afsi +cnitial speed 4.0 m/s slides across a rough horizontal floor before coming to rest. The frictional force acting on the blocsf csgai ++6h-k 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 velocit,6jt ,al9z eirig244 tkyfk(iy 4.0 m/s slides 8.0 m across a rough horizontal floor before coming to rest. The coeffiz, kk69f2al i4j4itt,( gie rycient 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 rema 3f xlzn:labk;e ,,v byk1k2i6rfy(5sins at rest on a horizontal surface while a person pushes directly to the right on the box with a force of 60N. The coefficient of kinetic frictxv:y3 b fla;l,zne65ibfkk( 1 ,sky2rion 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 tbvg c-s2ec+ev4r *i a6o 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 surfacec* r-v6 ev2basig4e+c 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 ya0ey 5wm -0brbrakes locked. It then hits dry pavement and skids to a stop in a distanced. The coefficient of kinetic friction betweeby0a -emyr0w5 n 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 p9 nv;(pv7zkqllkpz 9t;/jh 8datch 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 kit;p 8kv9zv7n/( ; p qzlldjh9knetic 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 an ey-5-zjtvs +4t/mdg g nmergency stop by slamming on the car's brakes and skidding to a stop. Hov/ tn+-ggtzyd5j 4s- mw 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 2qwz6d u2-mi.ipl3o br2pl v9an automobile must carefully control each of the following devices. Which of these devices can9 26l. wp2lzrubdv-2pq3iiom cause 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 ryw;tr 8jo )(a e7;nde(mclrr xdc.+ 1with 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 takeoff?cm( te).rrd nrc1e7+d;ry(o 8l; xwaj

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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 c i7cmm+-b0ns2 n,w/ f7ns5uil x9dkl 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 thmun nw 7/ - df0,k7lniclxc92sis+b5 mere 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 roller coaster tracks of eqcz: jm6spkzma zuicjb f 8)px+6;/ 8z7ual length. Assume that on all tracks the roller coaster carts start from rest at the same elevation and moves frictionlessly over the traczb:6z6i z+za8cu; /xjp8k sfcm pm )7jks 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 rolled; vxz54w vfy7r coaster tracks of equal length. Assumfvv4z dy5w7x; e 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 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 hkjnklq /w0f3lm-1; m the curved track from point A to point C under the influence of gravity. Whqm0/mkh13jwl-k n ;lfat 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 kgb6w (9ph:u6knkc i-,yraxi 1w is dragged across the floor by a rope which makes an angle o(ib9h, a:wp-u ykcrikw6 1xn6f 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 against a wall by a 100 N forc lyj25v8zhs y)e as shown. Thecoefficient of kinetic friction is 0.30 while the coefficient of static friction is 0.50. What is truj2hly5v zy 8s)e 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 giwrg /ypgqnd; g*r740rass 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 variodrw4 q*yrp;0 gng 7/gius 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. Neither is moving. Which of the8aag(6s7wk zi -xr6et following stat8i6-axt a w6e(zsg rk7ements 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 sleigh is pulled3 nst3jj u.: 3ik7f/su3rnrua up a hill with an increasing speed. The crate is not fastened down to the sleigh. What forcnuk .ujr ri3aj :337/3tsn sfue 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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