IB Physics Homework 7: A2 Newtons Laws I (SL & HL)

1#

Which of Newton's laws best explains why motorists should buckle-x7 hizone*6e,tw8;yp up?

A. the first law

B. the second law

C. the third law

D. the law of gravitation

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When you sit on a chair, the resm4 iv v;p/wed.;3*nybnt4wn nultant force on you is

A. zero.

B. up.

C. down.

D. depending on your weight.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In the absence of an external forl)re3df 1j-c 5k6v mhwce, a moving 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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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned a;*,amkrp fe,off, while traveling in empty space, the skm,; ,af* eraptarship will

A. stop immediately.

B. slowly slow down, and then stop.

C. go faster and faster.

D. move with constant speed.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rocket moves through empty spac -vfq)8a4gu4l xtbm z/e in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be4-lq)f48ub mag/ vtzx applied to the rocket in order to sustain its motion is

A. equal to its weight.

B. equal to its mass.

C. dependent on how fast it is moving.

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You are standing in a movinylcz.rtq5p yd 2bt9(dbi;v+ ( g bus, facing forward, and you suddenly fall forward. You can imply from this that theb yl i(d9 2 vc5.y;r+dpbt(tzq bus's

A. velocity decreased.

B. velocity increased.

C. speed remained the same, but it's turning to the right.

D. speed remained the same, but it's turning to the left.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You are standing in a moving bus, fl/gr-v2 zg tyt* ole 6zitp9:3acing forward, and you suddenly fall forward as the bus comes tolg v6y3z-tpo9ti2ltz /rg:*e an immediate stop. What force caused you to fall forward?

A. gravity

B. normal force due to your contact with the floor of the bus

C. force due to friction between you and the floor of the bus

D. There is not a force leading to your fall.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant net force acts on an object. Describe the motion of the objsxq-+-skd3 nax nb+7gekm1ga / o t8-pect.

A. constant acceleration

B. constant speed

C. constant velocity

D. increasing acceleration

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The acceleration of an oox94t)q aqja: bject is inversely proportional to

A. the net force acting on it.

B. its position.

C. its velocity.

D. its mass.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A net force F accelerates0ws:nmmfxd,qm 5mfq0c n64o4 a mass m with an acceleration a. If the same net force is appl04m sw0md:o,4xcq q mff65n nmied to mass 2m, then the acceleration will be

A. 4a.

B. 2a.

C. a/2.

D. a/4.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A net force F acts on a mass m and produces an acceleration a. What acceleratefxu-8ux;jxh y auu-)7b5xi(ion resultse8(huu7-x5y )u;u- xj xfbxai if a net force 2F acts on mass 4m?

A. $a/2$

B. $8 \; a$

C. $4 \; a$

D. $2 \; a$

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you blow up a balloon,zwenwo+pn-ow o-v9eg5xm*7 y; :j 0cxio+ct, and then release it, the balloon will fly away. This is an7o,o wvi0t+- xpmn cwxj o ye;e+*:wz9cgo5n- illustration of

A. Newton's first law.

B. Newton's second law.

C. Newton's third law.

D. Galileo's law of inertia.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on. At every moment during9thr5clsz j nra h( :mb.p1i16 the collision, the magnitude of the force the first carr. jhhlmn9i6c p15 :tz(a sb1r exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of

A. Newton's first law.

B. Newton's second law.

C. Newton's third law.

D. Newton's law of gravitation.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you exert a force F on an object, ta97s(mv fmadd j0 ,+dahe force which the object exerts on you wilamjsm9+0fddav(7ad , l

A. depend on whether or not the object is moving.

B. depend on whether or not you are moving.

C. depend on the relative masses of you and the object.

D. always be F.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Action-reaction force 29xde ii)p0:gks8/ymz yt2rxs

A. sometimes act on the same object.

B. always act on the same object.

C. may be at right angles.

D. always act on different objects.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Action-reaction forceb2ig76ens ekgjrd) , /qkd*5ss are

A. equal in magnitude and point in the same direction.

B. equal in magnitude but point in opposite directions.

C. unequal in magnitude but point in the same direction.

D. unequal in magnitude and point in opposite directions

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 20-ton truck collides with a 1500-lb car and cau,wk fq1boi 1o,ses a lot of damage to the car. w q1fb,1oko, iSince 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) 切至整卷模式搜藏此题

An object of mass m sits on a flat tabloah :(kw /2:opzd(5ab8xo r mae. The Earth pulls on this object with force mg, which we will call the action force. What boooa d p(hmk/(a :r2a5z:w 8xis 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) 切至整卷模式搜藏此题

A child's toy is suspended from thep gj*,n4 yl( agos67gt ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0t6 n lgg(goj*syp4, 7a N. If this is the "action force," what is the "reaction force"?

A. The string pulling upward on the toy with an 8.0-N force.

B. The ceiling pulling upward on the string with an 8.0-N force.

C. The string pulling downward on the ceiling with an 8.0-N force.

D. The toy pulling upward on the Earth with an 8.0-N force.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Your bat hits the ball pitched to you with a 1500-N instantaneous force. The bah8zol x,b7)oczk jga3 e0s6k6ll xsg3bz08 c)la6z 6ok7ehj, okhits the bat with an instantaneous force, whose magnitude is

A. somewhat less than 1500 N.

B. somewhat greater than 1500 N.

C. exactly equal to 1500 N.

D. essentially zero.

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21#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's three -)eq4zom - j-f:cpht jq6qaqp4 /i6kilaws.

该题自我估分: (必填) (满分:1.0分)

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Mass and weight

A. both measure the same thing.

B. are exactly equal.

C. are two different quantities.

D. are both measured in kilograms.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The acceleration due to gravity is lower on the Moon than on Ea++e4m mz. y: nl7bwfzorth. Which of the following is true about the mass and weight of an astronaut on the Mooym7+ fz.beo4wml +:znn's surface, compared to Earth?

A. Mass is less, weight is same.

B. Mass is same, weight is less.

C. Both mass and weight are less.

D. Both mass and weight are the same.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An example of a force which acts ac qr;hyq+, mp6j-z1oqt a distance is

A. tension.

B. weight.

C. static friction.

D. kinetic friction.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Who has a greater weight to mass ratio, a person weighing 40dv1 (ztq*+spvh.m v5c 0 N or a person weighing 600 N? cs.v5(dqp*mvtz1hv+

A. the person weighing 400 N

B. the person weighing 600 N

C. Neither; their ratios are the same.

D. The question can't be answered; not enough information is given.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A stone is thrown straight pxb 3 (o2*pvlana(a,m up. At the top of its path, the net force acting on it i pa3*b2( xna,omav(pl s

A. greater than its weight.

B. greater than zero, but less than its weight.

C. instantaneously equal to zero.

D. equal to its weight.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 20-N weight and a 5.0-N weignjynkgj 9i(:l.ohxe ;m+c7 n ;ht are dropped simultaneously from the same height. Ignore air resistance. Compare their oh7+x y;.cknl9m(ng ej:;in jaccelerations.

A. The 20 N weight accelerates faster because it is heavier.

B. The 20 N weight accelerates faster because it has more inertia.

C. The 5.0 N weight accelerates faster because it has a smaller mass.

D. They both accelerate at the same rate because they have the same weight to mass ratio.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick and a feather fall to the earthgw br8o kse/o 2id.sqh0;770xo g;lp o at their respective terminal velocities. Which object experiences the greater forc087 o2/go; x s7w;pi0rolekbgd. ohq se of air friction?

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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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object of mass m is hangingrp oa0):v c*joj, td )vc;xbp; by a string from the ceiling of an elevator. The elevator is mopjav dtxc,0b;;p o vr:*)c )joving up at constant speed. What is the tension in the string?

A. less than mg

B. exactly mg

C. greater than mg

D. cannot be determined without knowing the speed

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object of mass m is hanging by a string from the ceiling of an elevatnkn9rd* )dyh 7or. The elevator is moving upward, but slowing down. r khn7 yn9)*ddWhat is the tension in the string?

A. less than mg

B. exactly mg

C. greater than mg

D. zero

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object sits on a fricz,a7 t) bmhdk 91w23k+hi) tb)tua rwetionless surface. A 16-N force is applied to the objectkd)7tz3+)w,utiart hb) w 29kbea 1m h, and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

A. $4.0 \; kg$

B. $8.0 \; kg$

C. $32 \; kg$

D. $78 \; N$

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sports car of mass 1000 kg can aj,w2knmnfiet 0a 8 /hubc,37occelerate from rest to 27 m/s in 7.0 s. What is the a2w o7eu,ci,abn 0njm3k8 tfh/verage forward force on the car?

A. $2.6 \times 10^{2} \; N$

B. $3.9 \times 10^{3} \; N$

C. $2.7 \times 10^{4} \; N$

D. $1.9 \times 10^{5} \; N$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Starting from rest, a 4.0-kg body reaches a speed of 8.ngu4,bcwo;vew-5* g l0 m/s in 2.0 s. What is the net foubwgc 5on- we*;vgl, 4rce acting on the body?

A. $4.0 \; N$

B. $8.0 \; N$

C. $16 \; N$

D. $32 \; N$

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An antitank weapon fires a 3.00-kg rocketv,mz:h mg0dcg2iz/ k8 which acquires a speed of 50.0 m/s after80/ gdgzci2vk,: m hmz traveling
90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

A. $4.17 \times 10^{3} \; N$

B. $3.62 \times 10^{3} \; N$

C. $2.82 \times 10^{3} \; N$

D. $2.00 \times 10^{3} \; N$

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push a 4.0-kg mass with the 6qcy;2 vt*d 5i,sr1we gntq7ssame force that you push a 10-kg mass from resttryg1s,6nvqsd qie *c27t ;5w ,

A. the 10-kg mass accelerates 2.5 times faster than the 4.0-kg mass.

B. the 4.0-kg mass accelerates 2.5 times faster than the 10-kg mass.

C. both masses accelerate at the same rate.

D. None of the above is true.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the mass of a person who ks81z uo*ojp- weighs 110 lb?

A. $50 \; kg$

B. $55 \; kg$

C. $110 \; kg$

D. $242 \; kg$

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the mass of an bp6w7e uohi8ue/h(j*jj* i q 5object that weighs 250 N on the surface of the Earth wherjuh ep*u b*qo5/jj7(8iwi 6eh e the acceleration due to gravity is $9.80 \; m/s^2$?

A. $250 \; kg$

B. $24.5 \; kg$

C. $25.5 \; kg$

D. $2,450 \; kg$

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object has a mass of 60 kg on the Ear:d w5hifm 1i: i2 qw 9dpdfnfmj2il22,th. What is the mass of the object on the surface of the w2q5m:2,:1hf2d 2ipi dfjnw f imd9il Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

A. $6.0 \; kg$

B. $10 \; kg$

C. $60 \; kg$

D. $360 \; kg$

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Object A weighs 40 N on Earth, and object B weighs 4xe9s+ lc8,q ot0 N on the Moon. The Moon's gravity is onsxoqtl8 ,ec 9+e sixth of Earth's. Compare the masses of the objects.

A. A has 6 times the mass of B.

B. B has 6 times the mass of A.

C. A and B have equal mass.

D. The situation as stated is impossible.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sue and Sean are having a tug-of-war by pulling on opposite ends of a *vjsqc*id6up0wp4 d1b aodv01da (* d6.2-kg rope. Sue pulls with a 187-N force. What is Sean's forceapds a4d(1i00dp b1 du 6v*ocj*w* vdq if the rope accelerates toward Sue at $2.5 \; m/s^2$?

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A stack of books rests on a level frictionless surf0km1w ti/dy5;k ur7hcace. A force F acts on the sic h0 7m5uwktydr k1;/tack, and it accelerates at $11.6 \; m/s^2$. A 4.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $1.8 \; m/s^2$. What was the mass of the original stack?

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two horizontal forces act on a 5.0-kg mass. One oiiy f 7;2kwa5khdd*n:) f4koforce has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the m*4:ifio27 ; 5h)yko wnddkka fass?

A. $1.6 \; m/s^2$ due north

B. $1.2 \; m/s^2$ due east

C. $2.0 \; m/s^2$ at $53^{\circ}$ N of E

D. $2.0 \; m/s^2$ at $53^{\circ}$ E of N

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object of mass 6000 kg rests on the flatbed of a truck. It is held pmmx0 sx,.njfnws 0 k19dkw9-in place by metal brackets that can exert a maximum horizons1f.9, nm wx9nskjdpw0m -xk0 tal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?

A. $15 \; m$

B. $30 \; m$

C. $75 \; m$

D. $150 \; m$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object of mass 6000 kg rests on the flatbed of a truck. It is held +- 4 otkopkok: 9fp,vnq6x33 ofgu0ua in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping time if the load is k :3opvn4oo3u 0gfkxo a69 upktf-,+ qnot to slide forward into the cab?

A. $5.0 \; s$

B. $10 \; s$

C. $13 \; s$

D. $23 \; s$

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