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

1#

Which of Newton's laws best explains why motorists should buckle-uclre28jw(hm+ xa0 u6lp?

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 chax5ewbj( hs3g6pk1 em/ir, the resultant 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 ewrj. lxk1x3 ol7akj/ pe hzh+)z8ca0 ;xternal force, 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 sudg +lbx 3jcf9-g-3ltyddenly turned off, while traveling in empty space, the starshy - jbllc+dg- f9t3xg3ip 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 space in a straight line with con 2;m m4igrsn8xstant speed. It is far from the gravitational effect of any star or planet. Under thes x2mgnrm i48s;e conditions, the force that must be 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 moving bus, facing forward, and you sudde6;wxs;7l ypx bnly fall forward. You can imply from this that the 7x y;;bw sl6pxbus'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 movin2ytbgir r8 gbz x*t:tbx9s2q-ub343x g bus, facing forward, and you suddenly fall forward as the bus comes to aqx rgr*2 ytb3bt-b3z2b8xi4xu t g:s9n 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 tsgm ;1:va;chny+2 ,ayfl5lq dhe object.

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 object i1h.h), xbybk os 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 accelerates a mass m wi.;io pq hr1ed*th an acceleration a. If the same net force is applied to mass 2m, then the acceleration will bp;dqhr1 oe i*.e

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 accelerau b,1)eu/kgyktion resulkuk 1,y )gue/bts 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, and then release it, the b.1fnm w., crh:x:d )n wtbgb-qalloon will fly away. This is an illustration ofc-).nhwgrnxq:t.1wdfmb: b ,

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 during the collision, the magniti;ce5gs ctg*+ ydhjf1a4mu 78ude of the force the first car exerts on the second is exactly equal to the magnitude of the force the * i;g+ h4u femyd7gj5sa1tcc8 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,o2u ofds* *,1gica *of the force which the object exerts on you willu, gf*2odo c ia1**sfo

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 forcmr l-7r-tzhj .es

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 forc*1* qexxi* gcles 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 ani-g9yt,n- 8p /kb zfgrd causes a lot of damage to the car. Since a lot of damage i8fi z9-b/ ,rn-y kpgtgs 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 t kohnbv jxuf6:/osia2*7ge 7a 8u6h-pable. The Earth pulls on this object with force mg, which we will call the action force. W72vp 6ha-ib go 6*:8u kho xna/feju7shat 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) 切至整卷模式搜藏此题

A child's toy is suspended from the ceilifmu l2e9q4l *d:twacj. .5 gfbng by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "rl dltu29 5 wfca.4b*m gef:.qjeaction 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 instano u8 4v:nm si;r16k nvwu+)*stpa uw)otaneous force. The ball hits the bat with an instantaneous n oipuavt: ;w+rvu14m))wou8*n6sks 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 zfciw)za0t ;k7yz4.5l)w h mrlaws.

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 2: p3qmccxtoj*2xaxuem1v), o h0rf5on Earth. Which of the following is true about the mass and weight of an astronaut o2a mjm)r2v, cxu:31 xq t 5*ehxfc0opon the Moon'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 at a distancp8k ss,eor/w0 i2jua6 0w1 ikbe 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 5. hrm8 dinx+zto mass ratio, a person weighing 400 N or a person weighing 600 Nzidm+ xh8.n r5?

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 up. At the top of its path, the net forcet93fe(wvvnv b: x+ jn41rh2o o acting on it i ho r1+nvne(2 jxv:bv94tfo3ws

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 weight are dropped simultaneously from the same heigt.: yenzfnv*4ht. Ignore air resistance. Compare their acceleray:ze.nfn *v4t tions.

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 falcqojf--f f 8)e*ed9w ol to the earth at their respective terminal velocities. Which object experiences the greater foe-f wf- 89f e)co*jqodrce 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 hanging by a string from the ceiling of an el+ 1v3qym 26xw i9nnn2ymsd-i qevator. The elevator is mmy3 dm 1-6nnx +i2swn29qvqiyoving 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 /s)u5 y)wgmj; xsw)q wfrom the ceiling of an elevator. The elevator is moving upward, but slowing dys )xmqu;w5gw s )w)/jown. What 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 frictionless surface. A 16-N forn o na,4f46tcjce is applied to the object, and it accelerates atf4 6tc,j n4ona $2.0 \; m/s^2$. 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 accelerate q4pkl0y9eeg;4/e9vr.uaeba from rest to 27 m/s in 7.0 s. What is theuap0;ry4eeg9q ke 9l4b. /aev average 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. r v.x 3+j:wrw,vultz-i.iel:( 6l bnz0 m/s in 2.0 s. What is th,-wl:u viz:jr(i3.l txbv . zl+ren w6e net force 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 ro.so2qa a0rxkf2 e8k(t 2qo4jjcket which acquires a speed of 50.0 m/s after traveoqs8o k(q2j .axer2j0t4f 2akling
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 same force that youd0miq6 :2bzgk/gjjx.nr 1m z3 push a 10-kg mass from rest 3m0x :zd/k6gi zmgr. 2jnjb1q,

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 pers d*m*cm3(vn q c, caj 0osb1-(whc7hkson who 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 object that weighs 250 N on the sef5.;x2 plnzeux6 tl2 urface of the Earth where the accele5 f2e.2t;6 xlnexupz lration 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 kgo5wjx 6zpj)+o8 orh-w , kb(ji on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravi orw6xpz-)+kb58jjw o,( joihty 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 Bkim0j pb;lz;a+ v dmw- z )hmff3n/-.m weighs 40 N on the Moon. The Moon's gravi)p-m; nw m af0d+mfkhvb-/.jl i3zz ;mty is one 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 pul)t 6 2yjla6iv ;cep4kbi3g*bh ling on opposite ends of a 4.8-kg rope.i*bv3g)hit 24a e; 6l6bkc jpy Sue pulls with a 61-N force. What is Sean's force if the rope accelerates toward Sue at $3.7 \; m/s^2$?

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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 surface. A force F acts v.cn(zrfq3q x, +o :gdon the stack, and it accelerates n,dq xgfvr 3.o+z( qc:at $6.2 \; m/s^2$. A 4.9 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $4.5 \; m/s^2$. 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 force has a magnitude of 8.0 Nyq ar+ .kp)/*di77c lhrknru1 and is directed due north. The second force toward the * ).pakk l niy+dhrr/q7cru71east has a magnitude of 6.0 N. What is the acceleration of the mass?

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 in place d 4a.dk ihrooe; )02trby metal brackets thatare t.h io r2o;k)dd04 can exert a maximum horizontal 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 hepu jiop* (cn5 *tpu,q-ld 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 n5c j-t,uo pipqpu(* n*ot to slide forward into the cab?

A. $5.0 \; s$

B. $10 \; s$

C. $13 \; s$

D. $23 \; s$

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