Which of Newton's laws best explains why motorists should bt:0* jr7 jtyequckle-up?

  When you sit on a chair, the resultant c b5l6zrd14kcm4 b xp fx)-oe3force on you is

  In the absence of an external force, a moving qe1qi j:f xq83h-apt+, ik(rcobject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are skm) z db67an1quddenly turned off, while traveling in empty da mn1q)zbk76space, the starship will

  A rocket moves through empty space in a straight line with constant spezm,r p ak4wbq mi.14k73doq- hed. It is far from the gravitational effect of any star or planet. Under these com,-a3 zm qdhb4ki. 7pqk4w1 ornditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving busb;gf1 ga)5 6 jmetcto/1oph+ n, facing forward, and you suddenly fall forward. You can imply from this thatf jg1/ m15n g6)+bo tptaheoc; the bus's

  You are standing in a moving bus, facing forward, and you si*1 cefsi ,)* rvgrvh3uddenly fall forward as the bus comes to an immediate stop. What force caused you to fall1ghs r3i,)ifcvrv**e forward?

  A constant net force acts on an object. q32mgox8 /2y( 5kue mmposbygoi) m *1Describe the motion of the object.

  The acceleration of an object is inversely prot qkznvsr ) 37+t;oq-jportional to

  A net force F acceler:9rs,e.. fn g gsvyvb;ates a mass m with an acceleration a. If the same net force is applied to mass 2m, then the accelerate .g nssv:b v,f;gyr9.ion will be

  A net force F acts on a mass m and produces an acceleration a. What ac(;n w raxcs;kd phxv +zr1:(y)nm*6,ggc7 gk bceleration c 6*)xggsgn+ ,prc(kawnk dv1 (rx:7zmy ;;hbresults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the ballh;e o idacq0*5m) 4jk:y;ylksoon will fly away. This is kiqy04 ; mj)asy ld5;keoh:c*an illustration of

  Two cars collide head-on. At every moment during the collisi .djaatc)-0 ow:jkm- eon, the magnitude of the force the eamaj0.j- -w kt )cd:ofirst car 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 objelu)bi,m2t p/2g qjy)mci )r7l vma,p8ct, the force which the object exerts on you wi tr u) 8av ,lmpqlp 2gimj2m))i,yc7b/ll

  Action-reaction forces)pg4r n8r eoq+

  Action-reaction forc0ppvk 5det282mzg k 8o )r8egxe2yev;es are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the :swcrr -js-c)car. wrsjr--)c s :c Since a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object wy77tj -c)g+0p8 39v zgboks oxtfho .it9zr.jith force mg, which we will call the action force. Whajvth zscy7go t8oox7 ibp-g z 3).r9kft0+j9. t is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earix;gdbf3j+1p 8pobx -ol+k rh 7e6l7yth pulls downward on theolkf pp6 -g+x bryb ; 7+8ohd31lijx7e toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-jo95y-g s c+*6h u *mkuu 9rgph4itah.N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude ip o-*r69u+j*. kstacyuhg5ihgh94u ms

State Newton's three law4e -9xhvupj1;px k a/ vvj.x)ks.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. y 13d q8tqynxdkgxt;t gh.y;a 4i)y 8:Which of the following 8yhtnytg:8dq4y 3tid a qx )y1x;gk;. is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a forcei7zfq3muw 7zxg4zf3y/8 v) ga which acts at a distance is

  Who has a greater weight to mass ratio, a person-udcnxsvm my)of)l;( qr60l8 weighing 400 N or a person weigh;ur06)c yofm)sm-xldq 8 (nlving 600 N?

  A stone is thrown straight upi6b 8 jx1dw6t j*7,raye*0wx,ys cphy. At the top of its path, the net force acting on it isiajjrxh*,we , y6 py*1c0tybs76 wd8x

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same he v,;:vdx,: wihike;cbight. Ignore air resistance. Compare their acceleration:v , ;kv:cwibdxh;i,es.

  A brick and a feather fall to the earth at theviv d0jj xu*(-ir respective terminal velocities. Which object experiences the greater force of air fric u d0-*vjjixv(tion?

  An object of mass m is hanf2j3vm3ckcw2 15 vl hiupf4g,ging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in th2u 3 m c c1w4ffjgpvhv5i23,lke string?

  An object of mass m is hanging by a wns lwvp( woi151is69 string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What io6nliwis1v15sw p w9 (s the tension in the string?

  The force that keeps you from sliding on an ixe g/s.tj1yjqn: 3ez (-dbu:b cy sidewalk is

  It's more difficult to start moving a heavy carton fc1p hg/ g+g yll8wp1g0e4zz+ grom rest than it is to keep pushing i8 4/lc 11zpgp+yw0+glzhg ge gt with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal sug3,vekse8fb jo; i2w jlt.5v:rface (friction is present) at a constant rate. The experl5be ivt;2k8oe jw:v3 ,jsf.giment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. y/xk -8 dno/lsmsh -d/-ydz 8z Thus we can deducd n-//s-ld dk/8oz 8yy hsm-xze that

  A block of mass M slides down a frictionless plane inc wxwun me.+xge k(q4ki5y8 kkkg+)7g1lined at an angle q with the horizontal. The normal reaction force exerted by the plak kgm7xu4en)8qkg5 e+i gw.yk+w(1x k ne on the block is

  A block of mass M slides down a frj f+*op a -nqy *p(e9x-qjrtq:ictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the eyo-:* qjx -n9qp ( +ptfr*jaqplane on the block is directed

  A block of mass M slides down a frictionlesslihjobj1d45 r8 t*a(h plane inclined at an angle q with the horizontal. The gravitatio58 ih4dt (lohjbja1r* nal force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on ani0sz8 opvrt( 7 inclined plane that makes an prsit8zo 7v(0angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force *n 8t 6vr5sd(syy3 ,y jcefop6is applied to the object, and it as3n85t,ofcd yry y*jve6 6ps (ccelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 5)ahnu*c;ij j.6qcfu 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the av c5u*jnic6h uf .qa)j;erage forward force on the car?

  Starting from rest, a 4.0-kg body reach77box mwb)*8 7qagt4me: rakjes a speed of 8.0 m/s in 2.0 s. What is the net for meag*48:b)bj7otx a m7r 7qwkce acting on the body?

  An antitank weapon fires a 3.00-kg rocn :r1u y5 eev 5k1,/kcq8jqvtyket which acquires a speed of 50.0 m/s after trvktc1 yvq,ke8 j5/ q:urey n51aveling
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 mass with the same2/ tj1 h ;pjliavc/s*y force that you push a 10-kg mass from rest,/jhs i*y;pjatl1/ 2c v

  What is the mass of a peinz9)il2 legnq/tg01 q 8zr0xrson who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth wher)l2pe,gwk6 :s dj*riye the acceleration d6:)* keg,lsp 2wdiy rjue 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 i pv:u/opo1uw8yxl2)g9 uf(j object on the surface of the Moon where the acceleration due to gravity is onv:uo(i2gxu/8u f 1)j9ypwo l ply 1/6 of that on the Earth?

  Object A weighs 40 N ox01w uvoozu5v fmu5 32n Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare th0w3 muf1v2zoxuv uo 55e masses of the objects.

  Sue and Sean are having a tu4;g /kektwn -dfkul,/ g-of-war by 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 accel n-;ed4g/fk tk/lukw,erates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a l20yvf n0uuh .bevel frictionless surface. A force F acts on the stack, and it acceleratesb0uy.ufv2 hn0 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 elevcu 8sh+uvgyufo+sl1 9 a3j +j)ator. What will the scale be reading when jhcy3+8+suasu+l j v9)f u1og the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevatoi4v-uh:(u o blr. If the mass of the person is 60.0 kg and the elevator accelebl4vu-h(:u i orates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in ang( l 62n ;)hjfzn65z8k x emp23bpcahn elevator. If the mass of the person is 60.0 kg and thx2cmlhn6e36an h2j z ) 8b;pf g5n(zkpe elevator accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One force has a magnitude of 8.0 N al y(0bvwx9mh .nd is directed due north. Thebh0w(m9x v.yl second 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 ooys035s.o lx+c6kywef a truck. It is held in place byy 5+6wl. o3ss0k xoyce 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?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in px,7 d i38*dcd ;eaohoplace 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 stoppin cidpao738h*o;x,de d g time if 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 fz*z((gx ,;noaet k5b.40 kg, what is the magnitu 5 eboa(zf(;,*k znxgtde of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fo(p ** w.fz.pawhmd a :6a1ybmig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the ma*dp:.aof.m1 *6 ahmwzbw(ypass of the pulley.)

  A student pulls a box of books on a smooth wzc0 n,cx 85.bulxj)v horizontal floor with a force of 100 N in a direction of ,cjxu0lvz )cx nw8.b5$37^{\circ}$ 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 with a force o; n.259bki agjoefu3 tf 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 isaf 92e3j ug;bno .5kit the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown i +fng4,*zphtin Fig. 4-2. What are the tensions in the rope*ifhn, tgz +p4s?

  In Fig. 4-2, if the t:s0++ycu kulaensions in the ropes are 50 N, what is the mass of the traffic k lcu:ay0us+ +light?

  Two boxes of masses m and 2m are in contact with 0g+l cise40k teach other on a frictionless surface. (lgs4 0t0e+ cikSee Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are iedc aza;b+ll18g mb1,d6yy0 h n contact with each other on a frictionless surfaced lz aldb86hb,0mgy1ey1c ;a+. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. z9)v 5s vjlv-k(See Fig. 4-4.) If the forward force s9jv zl5k)v-v on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m armidgf,u 5)bqp+8i: rd.eb gv8e connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massive bo.rg,:e5p gu id+bmq)d 8fv 8ibx?

Two boxes are connected by a cord running over a pulley as9t):api2 l/aljr br(r shown in Fig. 4-5. Box I of masrlabjtr /r(:2 )9pial s
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 :f +psxqtx7e:l(sw 6(h3ay i pkinetic frictions between 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 15 N horizontal forq7x h:a63(ws ys lp+(ft eixp:ce is applied to the box?

  The coefficients of static and kinetic frictions for plasti0l2omjg2u mxbt ;af.0 ul,,q.ur* jfm4o ar 4sc on wood are 0.50 anxj.jorfqalfl 0 .;4r*2sm u m0,ta o4m, 2ubugd 0.40,
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 zl) dx8fu0-*x,glx tc+x direction. It slows and comes to a stop with a constant acu*8x f-zx dx)gtc0 ,llceleration of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is p h.,p3 ilnc**txd0 fepulled by a 5.0-N force. A 3.0-N frictid,e *i.0hnp 3x fcl*tpon force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, f2ww9hxp fz0g*1l 4aio.a ims1rom rest, at a rate 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. It slides 50*bwc/i f6icgtw-a:b qc 9 85ue m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the iaccb:eqfcw896-w *b g/5ui it ce?

  During the investigation of a traffic accident, police foq)c:(7x,x/ldjg x c/ -yshwvind skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for t)v hox7,y- wgqxs/(cd / lxcj:he prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) l* ))ojjrwfv9+s cm(sjz (7iw The surface between the more massive box and the horizontal surface lf7sr+vm sc)j(j9 oziwj*)w(is smooth and the surface between 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 stacked. (See Fig. 4-6.) The surface betweenm t 6r7(dq bwgmwmw;;1 the more massive box and thqtb (6wgw;dm 7;mrm1we horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined at an anglt,d) va(sgh6s r a.h-l 6d(hh-aa),lsgt v.rse of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an a8ein(;sjqjk)*geq0alx ps8 (ngle of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclined pln 4rph e.w+hb8+g:jeh ane 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 inclined plane tilted/6m6 bbr e)sy/il nku2 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 e5bix0 fujh0dt by 4r88hp//uu50oj ydirectly down an inclined plane, at a constant velocity of 6.08x4 o 0ujb0eu/r8 jht yp0/du55yfibh m/s.
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 roughgqymm r(;6 6fm $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass mruzfjv9)) p3f(z5 jc m slides 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 weighing 500 N along a roug ibx r(65m/ kcitx8w4yh surface. The cable attached to th(/ik6r5b 4 yx t8miwxce log makes an angle 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 released from rest on a rough inclinedw9; bwmdgtq h6 (h4d)d plane tilted at an angle ofgh dt;4dqh96b(d) wwm $33.5^{\circ}$ 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 inclinejszmnv)+. 5ip7thx lwv+0+f f/yfx0ed plane. The 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 betwee5xj.ivl/stxff n pfv0 zh+yw +e 0)+7mn the object and the plane?