Which of Newton's laws best explains why motdn1lh+6iw oc) orists should buckle-up?

  When you sit on a chair, the result4j ox 7o;5:dhhns vtfp5fqj ( -*nnyl8ant force on you is

  In the absence of an external force, a ;cs3 t7u59n icd inc00(6 c pbwdmf+yfmoving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenle-a +w*ilud y o*t.0vey turned off, while*lo v0 i-*e.aye+duwt traveling in empty space, the starship will

  A rocket moves through empty space in a straight liutb 1 ym46em/2 shsrle:*k y q/znlv:,ne with constant speed. It is n/q*:4ys et h2,ls :m6mevuz/k1lybrfar 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 is

  You are standing in a movig- w5.l5votgc ng bus, facing forward, and you suddenly fall forward. You can imply from this t5 vg- to.l5wgchat the bus's

  You are standing in a moving be(dz x0 b3;in5gslp -vk-aws /us, facing forward, and you suddenly fall forward as the bus comes to an immediate stopig - ne kz;v3 w0(-s5sbxlap/d. What force caused you to fall forward?

  A constant net force actsxpo b2 diitx58an8 49l on an object. Describe the motion of the object.

  The acceleration of an sqv:wxk9 ui 2mk9c:tj jbp5p0- n:9hp object is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the sa(jq hv);(q r31wcvvz eme net force is applied to mass 2m, then the accelerv jqz)3q;crv ( ve(1hwation will be

  A net force F acts on a ma yv. 9-yv1krsxss m and produces an acceleration a. What acceleration results if a net force - krvsy9y.1vx 2F acts on mass 4m?

  If you blow up a balloon :0nx;;5r jocxfc8qsh, and then release it, the balloon will fly away. This is anox qs: xch0n;fjcr8 5; illustration of

  Two cars collide head-on. At evz*(j;cc c7 becery moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude ;bezcj*( c7c cof the force the second car exerts on the first. This is an example of

  If you exert a forceakp4 cyh:(q0q F on an object, the force which the object exerts on you wil hq(4pyk:aqc0l

  Action-reaction forc* 7vxrur6vn b0es

  Action-reaction forcesy,pf4s ;vextx:7w- qf are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the caisf*dr kao sx3v;);ju z-b ,m/7wua(a r. Since a lomisu s;-vao ,fb;dzx 3u(jwaa /)rk*7t of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this objx4bcqmfh *+jf a),vb8 ect with force mg, which we will call the action force. What is the reaction forc h4bxj bm8va,c+fq*)fe?

  A child's toy is suspended from the ceiling by myp4cpg z66+ lteans of a string. The Earth pull66c g4p+ptl yzs downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the baq:pwc5)hna )c 9win3 dqp7ig.ll pitched to you with a 1500-N instantaneous force. The ball hits the a7ihiqcn 5: w)g3 qc9)pwp .ndbat with an instantaneous force, whose magnitude is

State Newton's three l y ugk/iqqbxbdh./6vlh sxs+:j (+x,-5 0unw caws.

  Mass and weight

  The acceleration due to gravity is low;qni36abd2i a/; vz ;ydno,h)hpx a,ver on the Moon than on Earth. Which of the following iha) q;ni;n2p yh,a d,vidz/a3b;6vx o s true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dist6ux utkth q 12y ;q8i,c/ty4haance is

  Who has a greater weight to mass ratio, a personbu 0 vhm 50hk3nn+kbq/ou 53-jbjx6 bu weighing 400 N or a person weighing 63ub 5uu +n0bo/kb -hnj vj3q k0xbm6h500 N?

  A stone is thrown straight up. At the top of its path, the net foro;*eqhrkad 2(ce acting on it o(a rk;hd 2e*qis

  A 20-N weight and a 5.0-N weight are dropped simulxvxz3 r+ nv3h3:y;lca taneously from the same height. Ignore air resistan3clvn h 3vz3+xa;yr:xce. Compare their accelerations.

  A brick and a feather fall to the earth at their respective termi( z e3xmfg8m7onal velocities. Which object experiences the greater force m7oz8 fx(em3g of air friction?

  An object of mass m is hanging by a string fromt* kai+k346lfe yady4 the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the string?44d6f y *alk+ teka3yi

  An object of mass m is hanging by a string from the cey- o07g8,3t6lf vzj sgtod yvwf7 b4j5iling of an elevator. The elevator is moving upward, but s5s7z vgfd4ojy7 3-oygw8 b0 lj, tv6ftlowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sl , w7rw las4l:lc4k4 *sw8hkvzk*e5qidewalk is

  It's more difficult to start moving a heavy carton *oe)o qj (9(opqd,xvn x0lb53pyxb6 t from rest than it is to keep pushing it with constant velocd6qx)o5pyvq , (b( 3teo0*blxx 9 jponity, because

  A horizontal force accelerates a ra s av005l7ohrd:,0 +vv1oogarxvs8box from rest across 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 hapo,vrxov:71ha08r0 0r so 5vdsv laa+gpens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus wexahkji/d+brr m 5ic4-(/kn) f can deduceakb5 /j(i4rk+in /) x drm-fch that

  A block of mass M slides down a frictionless plane inclid8f1evse48 zl me*o.q0ggs a9ned at an angle q with the horiz4f8oqe selgd0e gv .am8*91 zsontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane502 :eu:qw dv:6nlxunf*a-5imzmazu inclined at an angle q with the horizontal. The 0: lau 6 mzeamq2xdu: uf*zi55vn:n- wnormal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless planeg5n:h52,kudqdt :h f b inclined at an angle q with the horizontal. The gravitational foruk25g tnb :d:dh,qf h5ce is directed

  Two toy cars (16 kg and 2.0 kg) ar+lbxpf/ r ,bu,e released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which /bu ,x+f ,bplrbest describes their acceleration after being released.

  An object sits on a frzh/l+qgca u82 ictionless surface. A 16-N force is applied to the object, and it acceleratlu/c+82gaq z hes at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 s. Whlii *c,lx4s4:7 kufvl at is the average forward force on:4il*lxiuv7l csf k, 4 the car?

  Starting from rest, a 4.0-kg body reaches a speed oxkkldwtb4f7 dye 6mp:x : /5c/vp;)nof 8.0 m/s in 2.0 s. What is the net force acting on the bodyxn 7oxw/vdctdb k6l f k)me5:;p/:y4p?

  An antitank weapon fires a 3.00-kg rocket which acquire lr9 jxm:d mx35ld2dembs,p/ 2s a speed of 50.0 m/s after travxjxdd5le2mm2m psb/r:d,3 9leling
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 same force that you push a 10-kg mafv8fxw/h3h/mu 7 7rxlss from rest,vm whr /flxhu x/7f783

  What is the mass of a person who weighs 11 ne: (,le:pnvt0 lb?

  What is the mass of an object that weighs 250 N on the surfac qe2y jrl0)*i jgf-0vse of the Earth where the acceleration due to gravityg e02s*v irfy0qj- )lj is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What bx rqk4-eyw;ad yu) k8-*wo e9is the mass of the object on the surface of the Moonewykwx o k*q9a--8 rdb)ue;y4 where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the d+v6jjcz f hipz/).t*;7b qllMoon. The Moon's gravity is one siibl+6lz dc qf);vp. 7tzhj/*jxth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling5(c9id lo- q q2uv*bhw on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N for h5lqd-9*wcbqv2 ( oiuce. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level vu vu1b484vzd fj,xwr s7 7ho9frictionless surface. A force F acts on the stack, and it azb4s7vuw r 791ohvj,8du4 fxvccelerates 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 staut tk;w,1-bx l5vpig:zf/b q2 nds on a scale in an elevator. What will the scale bep :vk1;5i q-tbzlfxu,2g wt b/ reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person isd:nnez us- sniw(pqwd 4/9c -9 60.0 kg and the elevator accelerates downward with an ac-9pndns d: 9us-e4cnq(w wz /iceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides io))5ymdiai c 8n an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upwarm dyc)5 o8)iaid 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 ha zqnne,5ksnl 3l9b .k 0ezqyv b0-/m/ks a magnitude of 8.0 N and v/-l qbkne9qsb0ze0.k,nn/35ylm z k is directed due north. The 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 of a bk ndrj /132ol(ve 6ioxk*/astruck. 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,2 o(oilsr 3/k6nekxj1*va/bd 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 t9u 1 d:l kpv1ha:au,djruck. 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 stoppin,duph1v:u j9akd:1al 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 k(xqj,*ljc cwp2psrvc2 7y ) f:g and m = 0.40 kg, what is the magnitude of t(pvf q,lw 2*r)p7ccyjcs j: 2xhe acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40f5k0 hlzl5-oc kg, what is the tensionlf50okz -c lh5 in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horveljwvriz v(* t943,: .yvdmkizontal floor with a force of 100 N in a directik ,l4ytv9imdev rz vwvj*(:.3on 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 bookm r-x tg0:.uqz )bdizph/m* )ts on a smooth horizontal floor with 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, whatr*xzm.uqi /)mp d bt:0zg-t)h is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. n *fixl 3h 0nmvm( k;a6kgr;n44-2. What are the tensin4 0gvm(3*k6i;n xr;mfkn ahlons in the ropes?

  In Fig. 4-2, if the tensions in the ropes ar5ae jhcy1(wfq(-etuxf3.a hpfu:h 08e 50 N, what is the mass of the traffic xfh( wf jf8 hh5pq (-3ay0utca:u.e e1light?

  Two boxes of masses m and 2m are in contact with eachmxa0.mxss ,r,+g6 nmc other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the mor sxxg+60 r smnc,m.,ame massive box?

  Two boxes of masses m and 2m are in ck9feiqdco0+c2 8sk8gtiz 2s ai ;;, oz0cwcf6ontact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massive i8cwa2s 2;z0cfc+d t8k 0o6cegi;zf,qsi o 9kbox?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. e j;v ozfj(i7rq0) 9ix6o5bp* xgl 3af4-4.) If the forwa jii 3 5ela;xjvfxo(60r)z*g7oqp9bfrd force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fis 5 vc.od04zvsg. 4-4.) If the forward4.sv zd0sc o5v force on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley t zlzp/8(2cnk0 c6eygas shown in Fig. 4-5. Box I ofc0eyzp 8kl(t6n 2 zc/g mass
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 between a 3b9c3)vr zfh:z .0-kg box and a desk are 0.40 and 0.zb3c )fv9rz :h30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetib;u81c07eweqg2 o 5 i)i zraxetnh6 x:c frictions for plastic on wood are 0.50 and 0 er;nh) ez 7tugocwie 1a8620xb:x i5q.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 cu r gk)7g19awin the +x direction. It slows and comes to a stop with a c u1w )g9ra7gkconstant acceleration 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 pulled by a 5.0-N force. Aw jqlaeu4e9w -+hr2hhc 7 x3*v 3.0-N friction force reta 3r-wxcq j492uh+7ev ewhh* lards 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 rate of . h4yh8s(iurp*y 7:oasy bxk* $0.50 \; m/s^2$ 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 50y)np(wl puzp.(8xf l/ m on the ice before it stops. What is the coefficient of kinetic friction between the8xp ()pnf(ulyz .lw/ p puck and the ice?

  During the investigation of a traffic accident, police find skim c6o+ma9fn 3dd marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimatec a63d nmm9o+f the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stackedryat 9j)yhj r3p sy/ *yxm -ws3ak21o2. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rou1ok32 -r9asj /sh2ymawpy) jyt *x3 yrgh. 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 stackfak *lj us+2 s;fqdx.:ed. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the aqk+2 xs;duj:s* ffl.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 an 5kpx 28v8tngt an anglpxvn2 t885kn ge of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat v4 8 ,wdz ypkq+4eorcf5aub33hill that makes 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 smooth inclined plane with an 4h c/ jo0gnh1lt9:b srangle 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 incgt pw8p yskiw1lh)/z6zk .:nyo31p 3plined 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 directly down an inclined plane, at a lptcl 1oq o06qdy:k4p7(h( sgqp6z+ kconstant velocity of 6. qgpl k y+ k oo7cq4d(q0sp1:ht6(l6pz0 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 a3gxe7c b:l0lm rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slideexvntn9,e / ;es 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 t9e:mf , dm( xvl*t0auwl*f2k500 N along a rough surface. The cable attached to the lovk(u2m,f9 tm*tfe0*x ll:a wd g 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 inclined plane tilted at an anglug7ff3ar ,g(ft7 (ugm*gcb )ue of (f*tfu agrg um7c7 ug3,gf(b)$33.5^{\circ}$ 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 onrz 7fwcy *:x1j an inclined 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 betweenrj :1yf czxw7* the object and the plane?