Which of Newton's laws best explains why motoris 3,wj axkh5ym elnq52e b8u+2lts should buckle-up?

  When you sit on a chair, the resulta*jvub :g/ y:ra (.ik0l-p9bkuw1vbsp nt force on you is

  In the absence of an external force, a movingbqs6m,22kjn33 za0 fqxkrje0 object will

  When the rocket engines o 5 e1lyx*:upgjsnu6 8wn the starship NO-PAIN-NO-GAIN are suddenly turned off, while travelingugu8pwj* 1n5:ls ex 6y in empty space, the starship will

  A rocket moves through empty space in a stra):h 9dkqcai0wkv, g m+ight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be ai k+g :k,mdqhw 9vc)a0pplied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall f479r8f0 uria dfgnq-tyaw, .k orward. You ca,nrq. 7t-af ud8gywrf0a k49in imply from this that the bus's

  You are standing in a moving bus, facing forward, and you sudrksj*vdazr( bx k0:ge;0 k, 0adenly fall forward as the bus comes to an immediate stvbz0kk jxs0:*g,r;(e k arad0op. What force caused you to fall forward?

  A constant net force acts on an object. Describe the , t *ubccw /xh5b9k)qmmotion of the object.

  The acceleration of an object is inver5 6q4dp/grpna8k8 vas9 zw ;n9zdq6rxsely proportional to

  A net force F accelerates34.v;mw v asf 7jzkw6v a mass m with an acceleration a. If the same net force is applied to mass 2m, then the accelwvm7fwz.;4sv 3vajk6 eration will be

  A net force F acts on a a, ,ce9e ofty*mass m and produces an acceleration a. What acceleration results if* ,te9yefo ,ac a net force 2F acts on mass 4m?

  If you blow up a balloon, and thmg it (:;3 ptwkof(0dden release it, the balloon will fly away. This is an illustrati(p:o (df;3k itmw gtd0on of

  Two cars collide head-on. At every moment duri289ua;/,c4cqz0j zsuy:cb qt cf, ) ko5a aehyng the collision, the magnitude of the force the first car zyo/8)0uc baa :h4 sa qj2c,;efktzcu5qy,c9 exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an objh(55yj*uc9ed+ c 4/be qpnj csect, the force which the object exerts on you will+9j cns*4dycu bee5p/(qjhc5

  Action-reaction forcesqthj:b :zzz+ xg ndl+02f2j/s

  Action-reaction forces al)rpj(/dmie0 yl3n q/ re

  A 20-ton truck collides with a 1500-l1q fpwo:e : kfkv/ox (l22x52 syfguf3b car and causes a lot of damage to the car. Siguy2owk k:l f3xo:2f5 s/efvpfq12( x nce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth p- v jb*ab3jfk+mn-s/s ulls on this object with forcebm/b+avj jks3-f n*-s mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. Thiiv(f9jn07zrj s(7 mje Earth pulls downward on the toy with its weight force of 89isrjjz vnfm (i(077 j.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-r3n; 6bf;bkukN instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude ikubrnbk;f ;6 3s

State Newton's threea0nx7q ovg t1 nw0 et79fxcdkomf 827. laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon th. zdqp/kt5,hb 7k 6v dzqdhm94an on Earth. Which of the following is true about the mass and weight of an astronaut on thez hd4p t5k/kv.db,mqq97dhz 6 Moon's surface, compared to Earth?

  An example of a force which acts at a distz k: zg-r8n5jyance is

  Who has a greater weight to mass ratio, a person weiwrfss,g p n(:fsha:; ri p,*/xghing 400 N or a person weighi,h,sixrn:wp ;: fpsasg*( / frng 600 N?

  A stone is thrown straight up. At the top of its path, girvdxpd i-g,82;6 bothe net force acting on it6i-gdpv ;groibx8 d2 , is

  A 20-N weight and a 5.0-N weigi f)p-e33/aq .bipsm wht are dropped simultaneously from the same height. Ignore air resistance. Comaimppq. -w)s/3 f bei3pare their accelerations.

  A brick and a feather fall to the earth at their respective terminal ve o2 gt6.;guwmzlocities. Which object experiences the greater force of agtm 6g2u .owz;ir friction?

  An object of mass m /)j,o m79y b)o kby/nhf7 z1jiuazn5ois hanging by a string from the ceiling of an elevator. The elevator is moving up at constan)n7 ob1/azih 7yf,u5)kjb/o oynm 9jzt speed. What is the tension in the string?

  An object of mass m is hanging by a string fro:vm 2st: ry9 m.yw;glsm the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the stri ymsg2v: sr:l ty;w9m.ng?

  The force that keeps you from sliv;9 . zc)uuhgy 48*j;nutxk tvding on an icy sidewalk is

  It's more difficult to start moving a heavy car w t+y avr /56t)d557amp3oyh4bveshwton from rest than it is to keep pushing it with constant velocity, becausev 5teama3y4yp+d o57wv/)sbr w 5 6thh

  A horizontal force accelerates a box from rest acrosqzn ) tskzfkl *7f5,;us a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. What happens to the box's accelerationkq5t *);, zf 7fzsukln?

  A packing crate slides down an inclined rampf,fdvgei(m 6lc., r2x at constant velocity. Thus we can deducel.ei6rc,(v ,2 mxfgfd that

  A block of mass M slides down a frictionle-be5eg bw6 w-nss plane inclined at an angle q with the horizontal. The normal reactio b6ng5 eeww-b-n force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at t1*yucv49 vc;ti8scp9wfpe2an angle q with the hcvepc9 2i8f;19v4 spywu t *ctorizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frii5co6ylofmi9+xm d2 w3:7 i lnctionless plane inclined at an angle q with the horizont:95mwmoli6nxl+3d y 72fi ci oal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultanag3v7 uhu ,2sceously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which b3svhg c7 ,auu2est describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force isu.f1 w(txze wd z00*h;ukvag) applied to the object, aaz0h0w xzu*g) v;kwf e 1u(t.dnd it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 );am h fd zbzo2- :lrq rf-9ex:j8 e00e3opoackg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on c z-o:q0;hmaea :b8d)-jrf 0zf 93epo2roexlthe car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/swdyf4;sz w noojb7*2) lvjt:a /2vqz2 in 2.0 s. What is the net force acting 2vw2b;wa o)nyt2f7zlj*v:j zs d4/oq on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0d9p tutibji68 d u5+4qj0,f wj m/s after travejqdjw+fd p6b50 tti i8,4 u9juling
90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

  If you push a 4.0-kg x qn3x8nu +t,bmass with the same force that you push a 10-kg mass from resqx,uxn8n3t b +t,

  What is the mass of a person who weighs 1+q )2zet l)iwh10 lb?

  What is the mass of an object that weighs 250 N on the surface of t5w egc///h wrw yupx 5uut3,kg(gws,-he Earth where the acce(,/,g 5pwug/s-/r e5uk gtcx whw3uywleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object on tmmnnzod94x m(a6 st nd87/bc8he surface of the Moon wh8mb6 as mcz97x4dd/nont 8m(n ere the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N mxm pvk,(bpdji :gyw)n13+5 7l vrz5aon Earth, and object B weighs 40 N on the Moon. The Moon's gravitvpj , yp7b5xdia 3v+:mgwm( z)51rlkny is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by;jh9 lh9 o6 /ugy.uh;eek 8yfy pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Su; 6ue8ouyyeyl9.g h hk9 hf;j/e at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A tujw-l7dh)b ;k /t)y:zbe8fa force F acts on the stack )tdlwjetuhf) b;-za yk78:b /, and it accelerates at $3.0 \; m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0 \; m/s^2$. What was the mass of the original stack?

  A person of weight 480 N stands on a scale in an elevator. What will the . u0(z1d)xbh jcyzg .xscale be reading when the elxyg(dzh x 1.cb .z0j)uevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevac4in)8 rs65m+r 3*tr nmw;cd-t s mjxyfsm)2vtor. If the mass of the person is 60.0 kg and the elevator accelerates downward witn2r-tmm msn3*rji 4c)x 5tf8 w6vd;sysr) cm+h an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the n) 1)nobwa8k6,i .glxbfue 4emass of the person is 60.0 kg and the elevator accelerates upward with an acceleratibki,axe.wogu8 l4b1en) 6)fn on of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg magl b k, izghfx27;g,+yss. One force has a magnitude of 8.0 N and is directed due north. The gbz+f x, k,h72 gl;igysecond force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a trs3matpl( 9xd 1uck. 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 dixas 3m9p(dt1lstance if the load is not to slide forward into the cab?

  An object of mass 6000 j):q l-hl5 wnvkg 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 )wvjhln5l-:q the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, aw/n.h dx*+kl n(:aagkv-xq,what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pul(,g x xaw:nvn.*a/ ak-k hl+dqley.)

  In the Atwood machine shown in Fig. 4-1, if M = gm (xfps819 p.y blu*p0.60 kg and m = 0.40 kg, what is the tension in the string? (I xfby.( 1lpspg u89p*mgnore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth f9d4a fyd 3a:4vlwu8rhorizontal floor with a force of 100 N in a dirar3wuf d4 :a8d4v9fyl ection of $37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

  A student pulls a box of books on a smooth horizontal floor withlx6nttv 1ve ); a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, what is the nx 1vv;tt)len 6ormal force on the box?

  A traffic light of wei -dm ,.b v(hoalv6i,g;42gwtv:bshh9ze o0vr ght 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the rop 9s:b 0gt.e4-hv, lhb a(om6,v di hvw;vrgoz2es?

  In Fig. 4-2, if the tensions ins ao,6bn l2)h4s9 oab ;+kl4:u9qzj rgdshl1m the ropes are 50 N, what is the mass of the trafficd4ag obj9z:s)ml+s6n 1uoqsl9l ahk4h r2b; , light?

  Two boxes of masses m and 2m are in contact with each other on k )dgj(;ppm9ybn/y7be;pq; xa frictionless surface. (See Fig. 4p 7m()bbp9 ;gyyj qe knpd;x;/-3.) What is the acceleration of the more massive box?

  Two boxes of masses m avns,,j s;4tz :+qq ctyw0s jg)nd 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on th;4tw, +:qyqstgjcnv 0js),sze more massive box?

  Two boxes of masses m and 2m are connepbg7:xt2xl xj4j7 hu, cted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting bgj x7ul,j4xx:ph27t rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig.tfm ,w9y-lx7j 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massive boxxf7-,l9 wjmyt ?

Two boxes are connected by a cord running ovec*o- aq w6k)ktr a pulley as shown in Fig. 4-5. Box I of massaoq wc-6k)t*k
8.0 kg rest on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg.
(a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting on each of the masses.
(b) Calculate the acceleration of the system.
(c) Calculate the tension in the cord.

  The coefficient of static and kinetic frictions bej( x0tod(e z-7by1y zvtween a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15e-yz1 o7(xytzbvd j( 0 N horizontal force is applied to the box?

  The coefficients of static and kirs8be mcal(2/u2h2q w netic frictions for plastic on wood are 0.50 and 0.4r8 / hmaqbcel(swu2220,
respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?

  An object slides on a level surface in the +x directionx z a)z/omzrsf-n5; r:. It slows and comes to a stop with a constant acceleration of zforz mz/r a:x)n;5- s-$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horid2 yngtnm, (/enyc c2/;cwe i9zontal surface is pulled by a 5.0-N force. A 3.0-N ne icyn c/(2gmc en;y29w,d/tfriction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rateajs0 ewa3x 2erbe+c a5;gs p+5 of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initial speed of 10 m/s. w-jh 6va8 k8 hbfg5hs/It slides 50 m on the ice before it stops. bw a /fghs6-hhk 5j8v8 What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 m lo8yrm5iq w5e ph1mms )3ng. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditionsmiser 3q 5h5) 1pmy8mw. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stunu:3hyazl o, n 3o:d.acked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface betweeau: lno,zo 3h:.u3dynn the boxes is rough. If the less massive box does not slide on the more massive box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacke l 6iqq*kbu)/:evr lh6d. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does not slide on the more m/)uleqi6rqhbkv*:l 6 assive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. +nzs /qv:dz k-wrw8:g.(ga i9dh-u kd The plane is inclined at an anglkwh-8w-v:+iugq: g zzdr./sdd n (k9ae of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that maker ; y *ftc,l.9 n,bdgqbzs+l:is an angle of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smo8eijojq 5q1:9m(z;urn wt5 ljoth inclined plane with an angle of $37^{\circ}$ to the horizontal. If the inclined plane is 5.0-m long, how long does it take for the mass to reach the bottom of the inclined plane after it is released from rest?

A block lies on a smooth i.j1hag,cehc2 bsva0ceuf p( 0bg-(l-nclined plane tilted at an angle of $35^{\circ}$ to the horizontal.
(a) Draw the free-body diagram for the block.
(b) Determine the block's acceleration as it slides down the inclined plane.
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline.
(d) How long did it take the block to reach the bottom of the inclined plane?

  A wooden block slides dire+ow9c559snel 2 crtwt. t z-zxctly down an inclined plane, at a constant velocity of 6.0 m/s9z x+wcteo l n295w. zs-5ttrc.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass m slides down a roughplw5 2:; s5u(a: nsqc ifdju y*y/ku:e $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m sls2f)wxdvva6 1ides down a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. If the plane is 10 m long and the mass starts from rest, what will be its speed at the bottom of the plane?

  A bulldozer drags a log weigb7 g y5bxgx5u9hing 500 N along a rough surface. The cable attached to the log makes an a9g5 57ubb gyxxngle of $30.0^{\circ}$ with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable in order for the log to begin to move?

A 25.0-kg box is releasepljh 8nm0fce+,v7 )6fahpu * id from rest on a rough inclined plane tilted at an angle of8i 0fh,c+ul6m)v7 nppah *jef $33.5^{\circ}$ to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200.
(a) Draw the free-body diagram for the box.
(b) Determine the force of kinetic friction acting on the box.
(c) Determine the acceleration of the box as it slides down the inclined plane.

  An object is placed on an inclined plane. Thd ,xv8kif48j ne angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the o,xnkv dfi88j4bject and the plane?