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

1#

Which of Newton's laws best explains why motorists should buckle-ug,9rdg (n9be ep?

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 chair76jl-qw5o ra -irr9f q, 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 external foo; u7ad m akfh6z5.;qerce, 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-N 3afd01bf nza9O-GAIN are suddenly turned off, while traveling ia 1fn 93dfa0zbn empty space, the starship 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 consta/vmep1w aaczp8 *-n *fnt speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to aw8 pvn-*eap 1/*fmczthe 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 forwa3kflw 9;qx58:a+2 rirbygl *0l iwzgnrd, and you suddenly fall forward. You canx+wiag i bzw80lnql5ly2;*rk :grf3 9 imply from this that the 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, facing forward, and y--oo1u+mk(pdkko5c jsl o5w 6ou suddenly fall forward as the bus comes to an immediate stop. What force causedoj5k -m(cw1ku56ks -d+oploo 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 object hhg z)f 9oaw44cppb86.

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 o lb,y( z/mn*hubject 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 acceleq 3wjisz2.fphc2 rx ,*rates a mass m with an acceleration a. If the same net force is applied to mass 2m, then the 3hcx*,2jsrz qw2 f.ipacceleration 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 pro p0qu6lc.fr.fduces an acceleration a. What acceleration r.0u lf6c. fqpresults 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 balloon will flydh9y7a (m7 iwj away. This is aw j9m7ad(ih7yn 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 during the collision, the z bk udswxxa 22x.//y)magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the secukx ybsd 2 2z/.wx)/axond 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, the fo 2+dxxf cc2lfvm0+n3j;ilg+ krce which the object exerts on you wi+m2 3 dikxfcc xlf0gvnj+;l+2ll

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 forcehdu. 5d+ y4bl7se6yp-vrzy 1 ony*l)ys

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 forcejls79)lkydz3 j y.avy3 tz06 vs 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+g 3th;c)lxb1 tsv2ux and causes a lot of damage to the car. Sinc3ulh b+gv;st2 x )1xcte 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 table. The Earth pulls on this obg3a4e, i( kzo k ji5ck8y14knqject with force mg, which we will call the action force. What 5igqy844(i3nj1e,kc kka oz k 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 ceiling by means of a string. The Eartg* a (u80tgz(jsab( duisg;+ph pulls downward on the toy with its weightgabsd0(8tpz*g+g u;j ((saiu force of 8.0 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 i1rb13at5mz 6 -e pscn i1h;nbknstantaneous force. The ball hits the bat with an instantaneib1ept 1-mzrnn5bh;6 a1c s k3ous 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 laws y+c+4i4 8 v2jsmanlwz.

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 ek7m0b f4/zj37amxjw( wq 2rbe ;lt8agravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to w4lea8qb /zxm b 3tk77 a2(rewjfj;0mEarth?

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 forcl8i1 3p ehq*opr6w*t3wiu ga -e which acts at 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 400 N ov/u h1avfaxz9)fa i+1l j 8:fhr a person weighihff+a )v/9 vxuia81 :j1 hlazfng 600 N?

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 jx7bzldmi )+s 9i2z6 zits path, the net force acting on it isj mib26 9zix)z7+dlz 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 wehdja4b;u80sy a ui9p *ight are dropped simultaneously from the same height. Ia*udh i 94j0asyu b8p;gnore air resistance. Compare their accelerations.

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 earth at their respe 1 45zbjsajynktf .i/:5x4 bucctive terminal velocities. Which object experiences the greater force of a1 xa.54jbcf ysz:tb n4ji/u 5kir 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 ceiljdz ke07*/ f097-invg3 lk iviaxz uq;ing of an elevator. The elevator is moving up at constant speed. What is the tension in the string?u*0kv jkia -0q; 9 f3/iexdzl 7n7vzig

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 c faj;(qhd hp8jcv3c6;eiling of an elevator. The elevator is moving upward, but slowing down. What is the tah8q(; 6jp hv ;fcjc3dension 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 force is applied to theo1 kc s.tt;m loi:lb4+5lh2 fh object, and it llkb5lfot2t4 o1im .h sh;+c: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 accelerate frn60qe3zwye w3 om rest to 27 m/s in 7.0 s. What is the average foew0 yw363 zqenrward 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 8.0 m/s inwped-:6k1jcih eks4w .ru43 y 2.0 s. What is the net force acting on the body w. u63d-4ej4ihwkkp e:rc1ys?

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 rocket which acquires a s8qu s0g oqmbr,o; i5e-peed of 50.0 m/s afteriq,5b;-esg 0orm8uo q 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 wit hr(xnh8e )6qbh the same force that you push a 10-kg mass from reshrn6(xeb h )q8t,

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 weighwlfg0xxh934scw u+ d a (w35ens 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 surface of the Earth whe7 arj-7toef/v re the acceleration due to gravity is -v ro7ejta7 f/$9.80 \; m/s^2$?

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 Earth. What ys; r:2 yl p3;;2fueaqxuop9k is the mass of the object on the surface of the Moon wher;xurlfeyy2 ;9ppa k ; :23uqose 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 v dx.w xq9p73df4 zitg9) och:object B weighs 40 N on the Moon. The Moon's 94otcpdw9vq) g:ih3z.d x x7fgravity 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 pu 1+rp::(tp-o1c z*2m.dwwcwdj rzdhc lling on opposite ends of a 5.1-kg rope. Sue pulls with a 96-N force. What is Sean's force if the rope accelerates tow zhww cjptp+(2d d :rcz1cwrm1.d-: o*ard Sue at $5.8 \; m/s^2$?

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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 frictionlessqcw0d )+qdqw c(rq f:5 surface. A force F acts on the stack, and it aq d)wwq r+q: qc(d05cfccelerates at $7.0 \; m/s^2$. A 4.5 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $1.5 \; m/s^2$. 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 magnitud*kls 8z-.0e6o1cad rmc) du soe of 8.0 N and is directed due north. The second force toward the east has a magnitud* e-cod kd)zrm.8laso6sc10 ue 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 plac4*1 *z7ht d:xgdrfy- wycylvm(p 3 y-ce by metal brackets that can exert a maximumh czpxdy: 7 1y-3(c-lf m* g4*ytrwvdy 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. t 1lpcm)a-s(uuq6 n9b It is held in place by metal brackets that ct-c(19) lsuunba6m qpan 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 not to slide forward into the cab?

A. $5.0 \; s$

B. $10 \; s$

C. $13 \; s$

D. $23 \; s$

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