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

1#

Which of Newton's laws best explu gokcuzo;(-wher8i. k2la 2vp)2 -cfains why motorists should buckle-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,x.: t.n g0p 3g(u9iin:xx7 gmttsr sg, 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 force, a movin pn ysz0u+h;7fmsv35sf 0: srng 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 engineo 6(lrg5.sezfcmql. ,+dbf r(s on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty sc,.q6b lgef lf+(szod. 5(m rrpace, 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 nehi+lza p9x :by;s7dd fe :o pw:h(j3k1eq): space 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 be applied to the rocket in order tx no :7 ;eld13pq9ijzawke e y+:sf bh)h:(pd:o 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 forwar 7 .s23qwi 7 fnlpare:hswzs5-d, and you suddenly fall forward. Yow7 5 prsi h3 fesn2l7as:z-q.wu can 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 you suddenly 5o.* m1dqyfqy o2 ku-rfall forward as the bus comes to o qfd -u.o my5k2q*1yran 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 act6xw 2h8r+f-2ba- v0cl cel epls on an object. Describe the motion of the 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 is inversely jtaai) +yq:v :*. lb9skpjf9q 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 acceleratesc e4)d-ohwd/k(6 pkv h a mass m with an acceleration a. If the same net force is applied to mass 2m, then the acceler)kkh( 6/ hoedwp-dc4vation 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 acceu99oda) 9xjp aleration results if a net force 9ja x9o)u9dap 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, thn+ehsvth5gxoxi 7 . +by2 m61he balloon will fly away. This is antbesmg7x.hin 2 hy6xvh ++1o5 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 magnapw.i.f:ml c,rmj :3l itude of the force the first car exerts on the second is exactly equal to the magni.f3 cmjll:.wim pa ,:rtude 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, the force which the object ex d0i; misiz(vbc3y:7: vzfg3n erts on you wi 0icsfvn3y i(:mzzb; g3vd7:ill

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: e5q*o rv.cio.rjv. os

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 forceq*wn +/0i a( tk4ghhfms 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 axa 7ju -9oh1lm 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the caxmuj7 o 91h-lar

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 skupc sy,r 0i7.its on a flat table. The Earth pulls on this object with force mg, which we will callyu rkp7,c0 .si 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) 切至整卷模式搜藏此题

A child's toy is suspended from the ceili ;268opasrv 9u,4 tuhkz*v cgung 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 "reactv9u;8vzpu gha,* s4t r2c6kuoion 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 piv7m pq r6500-ufl ppw(ppw;eytched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose mu7ppw-lfp pv 0 ;(q0 rw6pe5ymagnitude 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 three7hn,uw-wrkj+ laws.

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 Earth. Whicsqwt9.qu09e8de (y7 e l le3agh of the following is true about the mass and weight of an astronaut on teseal97l0qw9qee3y(g. t u8dhe 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 atgbe((8 4wusruc 4l 1kd 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 mv5knx2uvklwwzx;l(2) 2 i:p N or a person weighi5v nw 2xipm: vwk22l;x(uk)zlng 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 its path, the net force acting 43.)v-sc nxwkcb 7 lkgpkf7i 1on it -k k.k7)s f 71licx4b3cvpwgn is

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 nu ywhgynr2t: e nv6 qk0*k,6*are dropped simultaneously from the same height. rn6e0 * 6thwv y*nk:yg,n2qku Ignore 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 to64xg1 t.atf( i8il kya the earth at their respective terminal velocities. Which o( 64ifa ya t8l1ktxgi.bject experiences the greater force 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 thelsbl -21:md7 9qvgy gu ceiling of an elevator. The elevator is moving up at constant speed. What 71dlygulv2 :q-s9mbg 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 ceiisrd0 ;,rm h:7on mg+ 7he1xy,nbd.bq ling of an elevator. The elevator is moving upward, but slowing down. What is the tension in thxr;nhres dq1mbm0 n.d :7+7 ,,yib oghe 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 frictionlesd)/l 0cdxittk 6 9pqf2 29rsres surface. A 16-N force is applied to the object, and it accelerates at 29 q/ 9prx)ti kcstdlr 62def0$2.0 \; m/s^2$. 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 from rest to 27 m/s in 7;vp a7( x/k:i2 y x9c7eq+awxy nww8fy.0 s. What is the average forward f7px+xa8veak y(y :/ n;9fwiqc7w y2wxorce 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 reache13ur9y-ar ru 7yg mo:wf s--sws a speed of 8.0 m/s in 2.0 s. What is the ne 3rss wy7o9-u-rmfr g wyu:-1at 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 rocket which acquires a speed of 50z9q ;y4l.54zfobvlo o .0 m/s after travelil v zo q.oby4z4f9o;l5ng
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 for*c/x.d(,;jacv lg tlol i0m)t 8vb+a lce that you push a 10-kg mass from reit/o0.; ll(avbd,v jax+lccm)l *8 gtst,

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 weighsx5cicayevnpc:*d ml 9:xr ;)2 110 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 th 1r(,5rzq ,+tldgeb-;ju5. ouv l petxat weighs 250 N on the surface of the Earth where the acceleratiol,tr ;bo+ze,5q.dput - v( r 15gjelxun 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 Earth. u*hy:17dcy 85mzefjx What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on tuhz8fdye y :xcm175*j he 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 40 N on the Moon. The Mtjh ha8o6crtpr5 jd7 rb,(4l2oon's gravity is one sixth of Earth's. Compare the masses of the obath ,47or pc52bljrhd6 t(j8rjects.

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 opposhm 8h2k4,rf8s1 kgopcite ends of a 2.7-kg rope. Sue pulls with a 69-N force. Whrh,k 8sc fhgkp2o8m41at is Sean's force if the rope accelerates toward Sue at $3.5 \; m/s^2$?

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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 w /;hk e01p /aoq;pznba level frictionless surface. A force F acts on the stack, and z;noak/bp ;ewh/p 10qit accelerates at $8.9 \; m/s^2$. A 1.2 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 magnitudev4*2(w(x j7dy zen9v/xav ibv of 8.0 N and is directed due north.w(2vi/j9 a4 *dv nv(xvebz7yx The second force toward the east 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 hevyu4db.m7,fm c; jgyf)hh ,ip)l. g1dld in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the tru fgd7 fcgl)pbmh; jh..,)i4yy 1m,vduck 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 600d+xw3) ,/rkqyowe, ey0 kg rests on the flatbed of a truck. It is held 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 not to rkqyeo/,)3ewdxw+y , slide forward into the cab?

A. $5.0 \; s$

B. $10 \; s$

C. $13 \; s$

D. $23 \; s$

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