Grade 9 Test on Mechanics 20241217 - 题库网 (tiku.one)

1#

单选题 ( 1.0 分) 切至整卷模式 eid: 4094 对错数 0:0 难度: *****

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A new car manufacturer advertises that their car can gf74on2vyiq 2n;omkhj+ 59) j* jljqaeo "from zero to sixty in 8 s". This is a descr*ei lhvajnjm94fk 5o2q;2+qj ) jyn 7oiption of

A. average speed.

B. instantaneous speed.

C. average acceleration.

D. instantaneous acceleration.

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2#

单选题 ( 1.0 分) 切至整卷模式 eid: 4095 对错数 0:0 难度: *****

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Suppose that a car traveling to the East (+x direction) begins to slow don+elpvu+5 n a,;-:vgbohco3x;k qze3xh ) d)lwn as it approaches a traffic light. Make a statement concerninxa,z-;)b3ko upq vee 3 5dgcon l+)hv:+nx;hlg its acceleration.

A. The car is decelerating, and its acceleration is positive.

B. The car is decelerating, and its acceleration is negative.

C. The acceleration is zero.

D. A statement cannot be made using the information given.

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3#

单选题 ( 1.0 分) 切至整卷模式 eid: 4096 对错数 0:0 难度: *****

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If the velocity of an object is zero, does it mean that the accele2tdmn k2 e;fg+ enz ;+g .z vin)vfczp7;*sf9rration is zero? Support your answer wi+9n zegm; fizv +s2ft*cf;7n;e v ).png2zdr kth an example.

A. no, and an example would be an object starting from rest

B. no, and an example would be an object coming to a stop

C. yes, because of the way in which velocity is defined

D. yes, because of the way in which acceleration is defined

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4#

单选题 ( 1.0 分) 切至整卷模式 eid: 4097 对错数 0:0 难度: *****

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Objects A and B both start at rest. They both accelerate at the same raton9m+r+k -pj le. However, object A accelerates for twice the time as object B. What is the final s -ornmp +j+l9kpeed of object A compared to that of object B?

A. the same speed

B. twice as fast

C. three times as fast

D. four times as fast

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5#

单选题 ( 1.0 分) 切至整卷模式 eid: 4098 对错数 0:0 难度: *****

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Suppose a ball is thrown straight up. Make a statement about the velocity an):7l4nxm yut,onr jwch1:h bc,; nl;cv ub)/hd the acceleration when the bal ;m:hrh xtn4,1n/n)b:jlco wbcl yvc7;hu ),u l reaches the highest point.

A. Both its velocity and its acceleration are zero.

B. Its velocity is zero and its acceleration is not zero.

C. Its velocity is not zero and its acceleration is zero.

D. Neither its velocity nor its acceleration is zero.

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6#

单选题 ( 1.0 分) 切至整卷模式 eid: 4099 对错数 0:0 难度: *****

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Ball A is dropped from the top of a building. One second later, ball B : 1 s+sq7otylzis dropped from the same building. Alq7: 1soytz +ss time progresses, the difference in their speeds

A. increases.

B. remains constant.

C. decreases.

D. cannot be determined from the information given.

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7#

单选题 ( 1.0 分) 切至整卷模式 eid: 4100 对错数 0:0 难度: *****

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A cart starts from rest and accge-v,c)) ifwo3 1lok kelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

A. 20 m/s

B. 16 m/s

C. 12 m/s

D. 10 m/s

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8#

单选题 ( 1.0 分) 切至整卷模式 eid: 4101 对错数 0:0 难度: *****

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A cart with an initial velocity of 5.0 m/s experiences a constant accelera3zwe20 l tm e9amp7qr/tion of0/qr9e3a2 7ep mmz wlt $2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

A. $10 \; m$

B. $55 \; m$

C. $66 \; m$

D. $80 \; m$

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9#

单选题 ( 1.0 分) 切至整卷模式 eid: 4102 对错数 0:0 难度: *****

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An object is thrown upward with g sa6kp9:x7i ra speed of 15 m/s on the surface of planet X where the acceleration due to gravi rs i6:kpa79gxty is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

A. $6.0 \; s$

B. $8.0 \; s$

C. $10 \; s$

D. $12 \; s$

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10#

填空题 ( 3.0 分) 切至整卷模式 eid: 4103 对错数 0:0 难度: *****

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A ball is thrown straight up with a speed of 30 m/s. (only fill in numerqak d4aqr3wly69z9 :gv( t;c pical value in the bla9ag6; t4qpvaqd:z3r9 l(kcwy nks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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11#

单选题 ( 1.0 分) 切至整卷模式 eid: 4104 对错数 0:0 难度: *****

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In Fig. 2-1, what is the velocitytf0; 6u0ulhbh at t = 5.5 s?

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A. 0

B. 10 m/s

C. 20 m/s

D. -40 m/s

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12#

单选题 ( 1.0 分) 切至整卷模式 eid: 4105 对错数 0:0 难度: *****

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In Fig. 2-2, what iszi0 ebii7 71+mdkc,n d the acceleration at 1.0 s?

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A. 0

B. $2.0 \; m/s^2$

C. $-2.5 \; m/s^2$

D. $10 \; m/s^2$

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13#

单选题 ( 1.0 分) 切至整卷模式 eid: 4106 对错数 0:0 难度: *****

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When you sit on a chair, the resultomamna/ 7*6r2d x 6nc afjj4. pb8o(epant force on you is

A. zero.

B. up.

C. down.

D. depending on your weight.

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14#

单选题 ( 1.0 分) 切至整卷模式 eid: 4107 对错数 0:0 难度: *****

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In the absence of an external force, a movingfu vw. rjc8( ubu( ;v62u.tdfi object will

A. stop immediately.

B. slow down and eventually come to a stop.

C. go faster and faster.

D. move with constant velocity.

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15#

单选题 ( 1.0 分) 切至整卷模式 eid: 4108 对错数 0:0 难度: *****

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When the rocket engines onw9c.vxdr 4 3ry the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship willvyx.wc9 34r dr

A. stop immediately.

B. slowly slow down, and then stop.

C. go faster and faster.

D. move with constant speed.

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16#

单选题 ( 1.0 分) 切至整卷模式 eid: 4109 对错数 0:0 难度: *****

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A net force F acts on lhc t dxoh6 9 hrs.l*h)abjj/ w5 1(u9olz88bea mass m and produces an acceleration a. What acceleration results if a net force 2F acts on m *b56r1djelxwloa9ohht hujh9 bz/. () cls88ass 4m?

A. $a/2$

B. $8 \; a$

C. $4 \; a$

D. $2 \; a$

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17#

单选题 ( 1.0 分) 切至整卷模式 eid: 4110 对错数 0:0 难度: *****

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A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the cdv5eo8egvkp: q q0 .m6lx4ok/ c,hoi 4ar. Sincoic0kd 5.:ep ogkm8 4x qo,elh46 /qvve a lot of damage is done on the car

A. the force on the truck is greater then the force on the car.

B. the force on the truck is equal to the force on the car.

C. the force on the truck is smaller than the force on the car.

D. the truck did not slow down during the collision.

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18#

单选题 ( 1.0 分) 切至整卷模式 eid: 4111 对错数 0:0 难度: *****

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An object of mass m sits on a flat table. The Earth pulls on4agf4(yw 8ptflb5 4zw this object with force mg, pwbt 4l g454a ff(w8yzwhich we will call the action force. What is the reaction force?

A. The table pushing up on the object with force mg.

B. The object pushing down on the table with force mg.

C. The table pushing down on the floor with force mg.

D. The object pulling upward on the Earth with force mg.

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19#

单选题 ( 1.0 分) 切至整卷模式 eid: 4112 对错数 0:0 难度: *****

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A brick and a feather fall to the earth at their respective terminal velocities.f,xsv73hv v0el ly(gjd+q9x + Which object experiences the greater force of air frictionxhe+d y7g(ljxv3 l+,vsv09fq?

A. the feather

B. the brick

C. Neither, both experience the same amount of air friction.

D. It cannot be determined because there is not enough information given.

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20#

单选题 ( 1.0 分) 切至整卷模式 eid: 4113 对错数 0:0 难度: *****

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An object of mass m is hanging by a stri6osh1) nv1a eqm 2) 0qykdx1bvng from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is o sm0kye)v n)11d1q6b q hx2avthe tension in the string?

A. less than mg

B. exactly mg

C. greater than mg

D. zero

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21#

单选题 ( 1.0 分) 切至整卷模式 eid: 4114 对错数 0:0 难度: *****

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A packing crate slides dowq xzbz/;6i ,k3if /j mjyiqc.1n an inclined ramp at constant velocity. Thus we can deduc zjbii/j1xy3m;zk f.q/i ,qc 6e that

A. a frictional force is acting on it.

B. a net downward force is acting on it.

C. it may be accelerating.

D. it is not acted on by appreciable gravitational force.

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22#

单选题 ( 1.0 分) 切至整卷模式 eid: 4115 对错数 0:0 难度: *****

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A person of weight 480 N stands on a scale ingh zst1h y:le7opo:j46j g* ylyhdj, .-k5 h6h an elevator. What will the scale be readidgyo-o5 . j 4h *hlghhy6psjkle6:t,jhz1y:7 ng when the elevator is accelerating downward at $4.00 \; m/s^2$?

A. $196 \; N$

B. $284 \; N$

C. $676 \; N$

D. $480 \; N$

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23#

单选题 ( 1.0 分) 切至整卷模式 eid: 4116 对错数 0:0 难度: *****

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In the Atwood machine shown in Fig. 4-1, if 1- mlfdk7*9qy;o pygh M = 0.60 kg and m = 0.40 kg, what is the 9 h7yfmp ;1lk*gydq -omagnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

本题所包含的其它图片:

A. $5.3 \; m/s^2$

B. $3.9 \; m/s^2$

C. $2.0 \; m/s^2$

D. $0.98 \; m/s^2$

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24#

单选题 ( 1.0 分) 切至整卷模式 eid: 4117 对错数 0:0 难度: *****

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A student pulls a box of books on ql4t47c s are0t1wtg4a smooth horizontal floor with a force of 100 N in a direction oft1tq04 wtc7r4ea sg4l $37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

A. $1.5 \; m/s^2$

B. $1.9 \; m/s^2$

C. $2.0 \; m/s^2$

D. $3.3 \; m/s^2$

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25#

单选题 ( 1.0 分) 切至整卷模式 eid: 4118 对错数 0:0 难度: *****

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A traffic light of weight 100 N is supported by two ropes as shown in Fig. 4- h8n,w-v pc ck7u6l8og-fv8w+c3vr na2. Whw6+c8lag8 c,p38v-ku 7 wv fhnnocr-vat are the tensions in the ropes?

本题所包含的其它图片:

A. $50 \; N$

B. $63 \; N$

C. $66 \; N$

D. $83 \; N$

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26#

单选题 ( 1.0 分) 切至整卷模式 eid: 4119 对错数 0:0 难度: *****

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Two boxes of masses m and 2m are in contact with each other on a frictip ls p5fmle4*0;* :q0tg)qvqgf 5oq ghonless surfaflt0q m*eog; p qq gs0*)q:vp hfgl554ce. (See Fig. 4-3.) What is the acceleration of the more massive box?

本题所包含的其它图片:

A. $F/m$

B. $F/(2m)$

C. $F/(3m)$

D. $F/(4m)$

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27#

单选题 ( 1.0 分) 切至整卷模式 eid: 4120 对错数 0:0 难度: *****

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A horizontal force of 5.0 N accelerates a 4.0-kg mass,h9 i +r2te 6+qrlzqztm4xk9w1 from rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

A. $2.0 \; N$

B. $3.0 \; N$

C. $4.0 \; N$

D. $5.0 \; N$

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28#

单选题 ( 1.0 分) 切至整卷模式 eid: 4121 对错数 0:0 难度: *****

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An object is on a frictionless inclined plane. The plane is incl ewsji8wa2i s9lk71m26y do-e ktu4r1ined at an angleks9rwi-w228ja7ou46eelm s k y it11d of $30^{\circ}$ with the horizontal. What is the object's acceleration?

A. $0.50 \; g$

B. $0.56 \; g$

C. $0.87 \; g$

D. $1.0 \; g$

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29#

单选题 ( 1.0 分) 切至整卷模式 eid: 4123 对错数 0:0 难度: *****

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If you push twice as hard against a stationary brick wall, the aft qmd40 lk uvn8lm-98mount of work yo 9um 8nllqmvfdk8-4t0u do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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30#

单选题 ( 1.0 分) 切至整卷模式 eid: 4124 对错数 0:0 难度: *****

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If you walk 5.0 m horizontally forward at a constant velocity carrying a 0 i 7g;1ta3bmbp0bk uq67ap- emkw-na 10-N object, the amount obm n1a;at-0 3be70upbw kpgam ki6-7qf work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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31#

单选题 ( 1.0 分) 切至整卷模式 eid: 4125 对错数 0:0 难度: *****

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You throw a ball straight up8:,o)t7k 1q fwwee kb+ui: zlu. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it gf kw8+::7e1uilb kquzotw, e) oes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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32#

单选题 ( 1.0 分) 切至整卷模式 eid: 4126 对错数 0:0 难度: *****

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A truck weighs twice as much ass/x(2yb cct8a a car, and is moving at twice the speed of the car. Which statement is true about the truck's kin2bc ycsa/8t (xetic energy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy of the car.

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33#

单选题 ( 1.0 分) 切至整卷模式 eid: 4127 对错数 0:0 难度: *****

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A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass i 2bvck6gke*i4 9 wq. 2zdwzy*ys moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before sto6q*d4bi2 kzv2kwygz *e w 9yc.pping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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34#

单选题 ( 1.0 分) 切至整卷模式 eid: 4128 对错数 0:0 难度: *****

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Is it possible for a system to have negative potential energ/.g40pb4n pkwg odh m7y?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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35#

单选题 ( 1.0 分) 切至整卷模式 eid: 4129 对错数 0:0 难度: *****

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An acorn falls from a tree. Compare its kinetic energy K, to its +xpefu3;e hjtp/*pm(potential energy U.pj3 pet/;ph*m x(ue+f

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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36#

单选题 ( 1.0 分) 切至整卷模式 eid: 4130 对错数 0:0 难度: *****

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Compared to yesterday, you did 3 times the work in one-third the time. To 9cu9-/ egu9s: pf9juq.j eds6hq4 o ymdo so, your poweru:/cj 6 e9 s.o hfqg 9jm4usqp9-yeud9 output must have been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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37#

单选题 ( 1.0 分) 切至整卷模式 eid: 4131 对错数 0:0 难度: *****

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If it takes 50 m to stop a car inq / y wb*jhj3 o d..2vxsre52ds0qg0aeitially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s un/sw2hjosaj r.d03 q.vx5 yq2 *ed0e bgder the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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38#

单选题 ( 1.0 分) 切至整卷模式 eid: 4132 对错数 0:0 难度: *****

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A skier, of mass 40 kg, p7;n iu, : u u-*rksh(nfoyl4 d /ss(6kya8lkusushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in ,/s(*sa 6u:(kfy 7k;un8i yuos-l kl4rh dunselevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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39#

单选题 ( 1.0 分) 切至整卷模式 eid: 4133 对错数 0:0 难度: *****

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A toy rocket, weighing 10 N, blasts straight up from ground level with a kinew zl.sk3c8b 6t/u efr6p/yku2c 3j- zptic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical hewr2bj 6k33csul/zzep-8cu6k . yf p/t ight does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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40#

单选题 ( 1.0 分) 切至整卷模式 eid: 4134 对错数 0:0 难度: *****

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A roller coaster starts from rest at a point 45 m abovur;w7 +3bd l8r)jgmdme the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the3 u;8j+ drgdm7rlwm )b roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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41#

单选题 ( 1.0 分) 切至整卷模式 eid: 4135 对错数 0:0 难度: *****

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A roller coaster starts at a point 30 m above thh(oc:f p*d6 )6frcxkl:ghq +je bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be :6+hhq kfg(f 6xc po )d*:rjclthe speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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42#

单选题 ( 1.0 分) 切至整卷模式 eid: 4136 对错数 0:0 难度: *****

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A 10-N force is needed to move an object with a constant v yy6e --8 zvrkdtz488 xpm*yzott1tys 4qmg 8(elocity of 5.0 m/s. What powepztt4ry1y8-( qmez*g-y 6 t8 mys8dk 84xvoz tr must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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