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

1#

Which of Newton's laws best explains why motorists sd rx 92vmvv8:qhould 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 7cbm+t3l3n iy 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 exterp 8lka9(g 4 -l;lhdttdnal 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-qnfjmvw 6ibkwfw b*u0l.my4/9 n /2r9 PAIN-NO-GAIN are suddenly turned off, while trn/ubw fb mv9/jny*lri92 fqk4w.w60m 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 through empty space in a straight line with constant speed. Itnh8w khslq9 7 c:dj3 sv57yhf/ is far from the gravitational effect of any star or planet. Under these condi8jh k/n9yfhl5sh7w 3:7 c vsdqtions, 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 suddenlum:lh 7x:l jp2 3ar6dyy fall forward. You capaxdyuml:6:r j273 hln 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 b4l4oo, ;)9tz uj/ s0anyrfhgsus, facing forward, and you suddenly fall forward as the o0s/4hgs ;f lru4 j)n,zatyo9bus comes to 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 th9 f sqgfv;c4o(e 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 proportionas32q0 xythm q5kef2ae e. +o,v0lcgx1l 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.5 oon*zohsl. . If the same net force is applied to mass 2m, then the ac5z*. o.snh looceleration 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 accc(gd: qg 6zu0leleration a. What acceleration results if a net force 2F 6d(glq:0 czguacts 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, thzx;igg6z*5 s6s ywf0x 6lt 7qfe balloon will fly away. This is an fi gxqtxl 0 6sg*y7s665zz;fwillustration 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 magnitud,lwx c 8c siuh84l5fu2m to4p3e of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the fir i 4 u,823otfxc wls5mhc4p8ulst. 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, *fhdrb. .r j)f(vr:qqthe force which the object exerts on you wilq:j.f*)dfr rv(qrb .hl

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 forc.7l/ )d7smrkd)ft fj:6 qkczfes

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 ar0x*p hh) egmk.e

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 causu5umh zq80rj +es a lot of damage to the car. Since a lot of damage is dorm0hu5j+q8 uzne 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 object witly ti1, ygj( x-:ktnf(h force mg, which we will call the action force. i,:l j t-1fk(g(x tyynWhat 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 Earth cq09:,n y l9emyj6 4mpf5fqwu pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reacefw0 6 ujyfq, mp 599my4qcnl:tion 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 y78nl fdbm,4w wjpl/ 1ne 90khpou with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose ml fpb/8hn, mejlk7d09 1w 4wnpagnitude 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 threep9l hmp5njtyl9zxe qv* 6 yd4k(8c0j) 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 thet9(evvgjz gj k(+ecsit )f7/. Moon than on Earth. Which of the following is true about thegz. /kt(j 7gf)(sit 9v+vcje e mass and weight of an astronaut on 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 act(a usl6e hp7*bjwmbxow7()w, s 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 ratv8g aohu1 4u)3sr 3cl(bip(dx io, a person weighing 400 N or a person weighing 6hr)iv(g3uo8p (acxsdb1l3u4 00 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. e*as; rix*v;t At the top of its path, the net force acting on it iss;vtrxi ;a e**

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 t2x.mvolgpfq h68 08vb he same height. Ignore air resistance. Compare their accelerat6 vh.mpv b8o 0fl2g8qxions.

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 tg(cno mw lqoy5c96hr:n1 hz 77erminal velocities. Whimzonqh6n 17(w 7hoyrgl c9c:5 ch object 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 i ph66 1h(gzct hmyg/:qs hanging by a string from the ceiling of an elevator. The elevato g/ h(y c16hpqzghmt6:r is moving 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 shzowb+r4n9;xkj+ k+ a string from the ceiling of an elevator. The elevator is moving upward, but 4+skrn+ ojh wz;bx9+k slowing down. 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 force is applied txxquodrv,mgs(r, : *- o the object, and it acceleratesrxdo xq,rg,:sv (m*u- 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 from rest 1-s e3cdz11ruf pqwmvf7wcsfx) 9 e/sno 1,m :to 27 m/s in 7.0 s. What is the average forward force o7ff s),1-q 1rezsdc wm119sfp v3uxmonew:c/ n 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 in 2.0 s. 2maazs0f5 zu quykr7c0 :s1 5qWhat is the net force acting on the bod0zsa qf1uq c5sur5m7kay:z02y?

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 50.0 m/s alwcyg*: tb5kk)dgp :4fter travelin tg:ylgbcwk ):*p 5kd4g
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 yod nx ; z,rod7s9+ka3fub8l-cwu4.vyz u push a 10-kg mass from rest,u.yf d dzrx37k4z-la8+ c,b9wnsov;u

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 persw 6xzlggu)fovcjaa0uk7 eg9sol-:c / 66k- 1lon 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 surfa fs8p5/0ebfbz ce of the Earth where the accelep/z5 ebf8sb f0ration 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. What is the mass h9: lduhib0(f of the object on the surface of the Moon where the acceleration due to gravity is onlydf :hubih 9l0( 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 Ear7m kuylt50y75*arjq wth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compwa507rluj7 q*t 5ykmy are 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 od k2d6 h6lr+fe /) wf d2zto3cfa7si*zpposite ends of a 4.2-kg rope. Sue pulls with a 154-N force. What is Sean's force if the rope accelerates toward sze ddzi )r w6c6/t2la* hff2odkf7+3Sue at $4.3 \; m/s^2$?

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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 spe58kau6 :nzd8ibs tn5dzr7d;) ou7 p tack7zz7du8a8ip6)pn5nudro : b ;d5te sk, and it accelerates at $9.6 \; m/s^2$. A 3.8 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.8 \; m/s^2$. 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 rh3u;0+ntv wimass. One force has a magnitude of 8.0 N and is directed due north. The second foru hvti3 nr;w0+ce 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 fpu* 3 n1.luwlb 1r9f*tn0 tc owyho8s9tm6(bblatbed of a truck. It is held in place by metal brackets that can exert a maxi . h*1w*8s rt blcn(bto mn b6uo193p0tyu9lfwmum 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 k;wq f. 3/t1q9xi2:pbxxaku e rg 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 slide forward into thkb21 px/:tafqx.u ;rx39qi wee cab?

A. $5.0 \; s$

B. $10 \; s$

C. $13 \; s$

D. $23 \; s$

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