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

1#

Which of Newton's laws best ea9goh/.x* /emnz lj1ycat* s2xplains 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, the resultant force on yobstr*; ; /pq80 sipycfu 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 07qnjxt*kwn 2 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 th2wb tir4hj 5u7e starship NO-PAIN-NO-GAIN are suddenly turned off, while trtu7w2b5i 4rjh aveling in 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 througphr8ukv k4n qb vp00.:h empty 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 to sustain its motion hkpkrb4vqvu 0 n :.8p0is

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 youzd/okpurb7h. cw )yj+c *ob 57p 8xcf9 suddenly fall forward. Yo 5 cxofp/ub 7dwh)k.z*9 8pcyo+c7jrbu 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 fall forwarz;o36:cr /3v o:qlde md b3gtnxc1;z1ytr-rad as the bus comes to an immediate stop. What3d6rarrc; od3xq/tc1 m3o1z;v e: ylzg :bn-t 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. Describ)b k .23jpnpnwe 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 og xrj2.om )pkb51b a.nbject 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 accelerates a mass m with an acceleration a. If the sawlgrvdq/o+0 5d3je mt+p(c2 c9j p9 wome net force is applied to mass 2m, then the acceleration wpp(r9 2cc 5g/09 ltod+3qmjv w dje+owill 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. sk u-0qw1xkf 0fxbm2 w;-ljp4 What acceleration results if a net force 2-;xl-01su 4kf fwm 0xkqbwjp2F 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, th;zw7okov)n) ae balloon will fly away. This is an ill;)o7ozw kv)an ustration 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 durindok( dhk3l1ib13cmf* g9 yo0 ng the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second hbi1do gy3l0(k139cn*km fdocar 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 c::s j8pq,ou hforce which the object exerts on you willucqs ,j:op:8 h

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 forces b,8+ofnws*mn

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 forces a nt5hc*9dws w/)lip0 fre

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 witd9 55+pnwh a5ns g8xsj75oput hjc35 mh a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is dondgch 595oa35+ s7wx5snpmjhn5 8 pjtue 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 pull3 jx9u6bqd u e 8ow8vfkaq l7((kqbi83s on this object with force mg 3 eaolxq8 6kfdwvq8 ujqk (89bb7iu(3, which 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) 切至整卷模式搜藏此题

A child's toy is suspended from the ceiling by meae2,lvo6wmvgpfy 2 w(+ns 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 "reaction forc+2p v ,feglv(owm62w ye"?

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 j*g ;bdj*ws*b pitched to you with a 1500-N instantaneous force. The bal;* *s* gdbjwbjl hits 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 laws. -*pd7wxkh( 9gnmw-ov

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 low7 suq,*sf*we dfm-t:ger on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surf,t*7ugfds sw q* -me:face, 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 //gtjyzc1g-x:0weti8 w/ k g awhich 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 weigsw*r3yn zj 2 .sa5/rm/sg*fvp ht to mass ratio, a person weighing 400 N or a person weigs*sz*rvynpa2.f5 j/s w g/r 3mhing 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 upr74rfglcm 7c2rb y(5n. At the top of its path, the net force acting on it isg(7 r r5cly rcn7mb2f4

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 simultaneoush)lly4+ q 6majly from the same height. Ignore a4jm6qll+y h )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 respective term )-iflrls 6+q+d 12 boipoidj-inal velocities. Which object experiences the greater force of air fri+-dlrq+- o)i ji6pfo2 isl1dbction?

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 han-ck5 v 8dvo3mqmg 8ke1 m6qnx7ging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tqkkdmc-x6qe38g71mov 8mn5 v ension 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 bwk )titj5*r*pd o gs+b-9b3uby a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What it* s59 ob3t+kd-b)iujrwb* gp s 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 surfac )0sa2*f-qibq c l-da5y eouv0e. A 16-N force is applied to the object0v0)cdiq- 2 eu5-*bs aqolafy, 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 1000m5 9q )9xteges kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the car?sgt9m9xq5ee )

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 in 2.0 pj ei7 5 beis5q-f). adw2nta5s. What is the net force acti)2neepqb5i s5jfadia 5.-7w t ng 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-ktca4n sm 6(m i5cqgcr .um2v85g rocket which acquires a speed of 50.0 m/s after tra8tsucac q2mi4mc5 5r .m6gnv(veling
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 you push a 1r(etnr7r raw g-ia18*0-kg mass from rest,rr7n*r8ag tew(r i-1a

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 22 ;;npkud-ww ah7ez h+3cpep person 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 surface of -x xr+m(5akf 0ehe5jlthe Earth where the acc-xle5+r fh0e5(m xjk aeleration 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 wwo*q 9 q6ak+gof 60 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of t+g o69qq wa*wkhat 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 objec6a;qpp 5xn m;mt B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of 5;ppa6mmq ;nxthe 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 e sac.4 /aeo uqt7c6ob0nds of a 5.0-kg rope.. 6qtebso 04au/o7c ac Sue pulls with a 79-N force. What is Sean's force if the rope accelerates toward Sue at $3.6 \; m/s^2$?

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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 on the s6sy*yv;wmd+b(,0 gno- m4orx:mn fy u tack, and o,r- nmmg v+yu mx: dsy46wy*n;ob 0(fit accelerates at $8.8 \; m/s^2$. A 4.7 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $4.8 \; m/s^2$. 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 mz5rlf8zq cq:: ass. One force 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.c8fq:5:qlz zr 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 .pw55dzcssp)on the flatbed of a truck. It is held in place by pws55 dcs)zp.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 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. I6da38nf s7 rjz 8o-idit is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15-8nfaj7ii 8zsd6r3o d 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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