Which of Newton's laws best explains why motorists should bucklor:q2eeuqw;- e-up?

  When you sit on a chair, the resultanbh (ww)h i)8n0iah b2w *oy-met force on you is

  In the absence of an external force, a moving objeca-1zlqpwdvsr1)( od 7ip 3u)i t will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly :z/ dd9 gna:p2sxhg154h,qun0xqso z turned off, while travn/z1x::sgph 5d40zdqx ,nsqu29 gha oeling in empty space, the starship will

  A rocket moves through empty space in a straight line with corr tqx yx16;lzlhe vh6o, a8*nc w3(p.nstant 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 su,er*1px zxqo l8h63;twc (rn yvha6 l.stain its motion is

  You are standing in a moving bus, fla: x797t1gkftn mie 6;ya.sfacing forward, and you suddenly fall forward. You cfx a;mta ft7ikgeny: .96 7sl1an imply from this that the bus's

  You are standing in a moving bus, facing forward, arp6phr7.y*w qnd you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall*ph.6pw qyr7 r forward?

  A constant net force acts on an object. Describe the mot dkl0+ p -g5wcw8+d)iif,ksj bion of the object.

  The acceleration of an object is inversely proportional tk;70wg ca/vpf 3u urmeg 5cb23o

  A net force F accelerates a mass m with an acceleration a. I17u m 1s*x c8cz4xo (kkg,d/dqsw(c4r iw bt.of the same net force is applied to mass 2m, then the acceleration wiwb*kosd xd cu74./ 8owqmc, g t1sz4k(xcr1i (ll be

  A net force F acts on a mass m and,o ur gwf,g*8noo*4l pavf.: :yko3jl produces an acceleration a. What acceleration results if a net force nl*yl:roufj .v 4o8gkpg *wo:,fo,3a 2F acts on mass 4m?

  If you blow up a balloon, and then release iy .4lzyv,f pt:t, the balloon will fly away. This is y,.4z pfl y:vtan illustration of

  Two cars collide head-,-t0kdach54sds /ovgf g-m3gon. At every moment during 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 car ex,a5g4mg ksdfsc-3/o0d h-t vgerts on the first. This is an example of

  If you exert a force F on an object, the force which the object .: e)5mbog0oycjny; lexerts on you wilnoyc): g5lo0e. b;jyml

  Action-reaction forccio la 6wzog;3 vh/ij7wzj ,29es

  Action-reaction forces ar2zcyq1 wi2hyx( 4;zx ce

  A 20-ton truck collides with a 1500-lb caryt+umo rnede c *g1)6m0v;(d d and causes a lot of damage to the car. Since a lot +mv u0er* ( t my6cdgd1oe)n;dof damage is done on the car

  An object of mass m sits on a flat table. Thedozk)8/+8tiklf63 xg yqia( c Earth pulls on this object with force mg, whichli /z 8)fd+(8 c yxkotg3q6kai we will call the action force. What is the reaction force?

  A child's toy is suspendedjn53-j zkjgq(uq ;- r*cvu gp: from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0-ujv(pn :q;g g3- k* urzjc5jq N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N ins7qdq0*/ jdr6 zqzl:vdtantaneous force. The ball hits the bat with an insqd 7/0:r6j vdz l*qdqztantaneous force, whose magnitude is

State Newton's three lawsx ezz ;w0qo:z).q p7 -wj5csrl.

  Mass and weight

  The acceleration due to gravity is lower on the Moon thanq94hqq 0uj .*xutol e0 t:tc7h on Earth. Which of the following is true about the mass and weight of an astroh*t 0etxl ucqj9.04:ho7utqqnaut on the Moon's surface, compared to Earth?

  An example of a force which acts jdd76xwwmi) xnztp u: 4 *wj) 45ha-eaat a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N b 2 2)uaxcgmq6or a person weighing 600 N? g)x2cq2a mbu6

  A stone is thrown straight up. At the top of its path, 8/t8 it0 raqxpthe net force acting on i/8x t0iaq trp8t is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from mo1msx q,)yudjv dydkc) 4,4*u: 5nr ythe same height. Ignore air resistance. Compare thy) :d4q v, kjr4udd5c m1ou*)y,syxmn eir accelerations.

  A brick and a feather fall to the earth at their respective terminal velocitiegm()ys ppxbq cfu x. .(p5,ml+s. Which object experiences the grmcl,pxysmu5 q( +fx ) ppg.b.(eater force of air friction?

  An object of mass m is ha(u8.a3bw*vk lq6 6(9b wb btcg3xyaiy/pmk * jnging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is t/bypu m38xj3a9igbw.cb( k *lbvt6a6*q( ykw he tension in the string?

  An object of mass m is hanging by a string from the ceilq4 kn-gl/3 q 5qzs/zfying of an elevator. The elevator is moving upward, but slowing dowk/sq5/zqyfgqnl3 4-zn. What is the tension in the string?

  The force that keeps you from sliding on vo: qk c((huak p6h3.x5yjpsrq 1x8j-an icy sidewalk is

  It's more difficult to start movin;taktlo20rn y/ hycrj6 ;j+m *g a heavy carton from rest than it is to keep pushing it with constant velocity, t /hrma6ny2k r y;+ ctloj;0*jbecause

  A horizontal force accelerates a box from rest acrotz6p)n: cfv7 fy )q;n(w1kbibss 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. Wh c 7k: )zvfi1 )bp;ywnq(fbtn6at happens to the box's acceleration?

  A packing crate slides down an incli ,gxd- ;7 qlvwsrbr h:;+br2x1 oj4qesned ramp at constant velocity. Thus we can deduce th72,+4lxb-boq hj;g: xr1d;ssveq rw rat

  A block of mass M slides down a fr*owsl2w ,; puvictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block pwv o2,l* s;wuis

  A block of mass M slides down a frictionless plane inclined at an angle q withsu1 s *7llkeb bxrmxq:y2(5e4 the horizontal. The normal reaction force exer5ur eblxq ke(:x 72s1*4b ylsmted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q witsf,m *zrukpo i+l5g.b4dac6 +h the horizontalslb ,6+.*p muz4rgkd o5f+ aci. The gravitational force is directed

  Two toy cars (16 kg andg z;m*cm+ 8k(z2punoscjqi- - 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration af -zmn*ocg; m 2(qcps+8-i kjuzter being released.

  An object sits on a frictionless surface. A 16-N force is d(7unbwb/-nb; t,ktb applied to the object, and it acceleratd7bbtbn(ku tw/ ;,-b nes at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg cyehr)x)*7:r0bd(h/v r yduh * po6l oran accelerate from rest to 27 m/s in 7.0 s. What )* lryr/)hx :vr 6y7edohud*r0bh o (pis the average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a pr 5pd zy0/ jvxox,*f)speed of 8.0 m/s in 2.0 s. What is the net dxv o/jp ,)50*yrxzfpforce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m hyoh4gukzn3f.a9+ 4x/s after 9g xnyahfuk4+3 o 4h.ztraveling
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 tha/bu* yn+u4fa kj5kolt :dq0p- t you push a 10-kg mass from rest,p kk4a/tbjy0:-d+5 *qolf uun

  What is the mass of a 8 4zjy2 u 5)evrel2lsgpy0;mzperson who weighs 110 lb?

  What is the mass of an object that weighs 250 N on fh(theom*f -/jeq7z ax+26 *mr *l4rhbz3m kwthe surface of the Earth wherehf boxwkh-+ *mf6rl* r ah /z7*qze23jem4m t( the acceleration 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 x kq)pgu;d5u :mys4 :cthe surface of th4:skc d;)ugqyp :5 mxue Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earazj m kk/w1u7q8w kbm7n nv+5)th, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth7u18mn7 n/ vmkz5 wjkk+a)bqw of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by dzt 3eoy 3cgta791 d16fppcw0pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N 0dtz wcy pa1tp6gec13o39d7f force. 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 frictionlesit0- rodl ;xws .7-)lmboz:ys ox00pzs surface. A force F acts on the stack, and it accelerab-oy-zwl0x)dzrsxo0mp i :s7 t . ;ol0tes 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 scapc2/ cl:,rdgljwcu1. le be reading when the elevator i1r / jcl2dlcguwc:.p, s accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of thep dg/i/ )1dieb person is 60.0 kg and the elipgdd )b/ie/1 evator accelerates downward with 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 the5wv1 0ydxfv;fq)r h,p mass of the person is 60.0 kg and the elevator acceleratqw0f1yv xv5p,)drh;f es 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 9sxe s5d,um co..rg-e mass. One force has a magnitude of 8.0 N and is directed due norors9e5cd.g sx u- .,emth. 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 truck. It is held in plyg sj e-w32t 2lmn4yog-o o.g-ace by metal brackets that can exert a maximum horizontal force of 9000 N. W go3l-jo4 .y2 -g -g2tsoynwmehen 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 -f5st u9b:yy*jvzzn/held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling f -sb/znz:5y*j9v tyu15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.qxg d i, bno)7r2c qj*i5lku rx0-*oh,60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the ou d j**nqh l5rx - )bk,iq,2crox70igmass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.46wz 2jvk zr-q4,j7 unh0 kg, what is the tension in the string? (Ignore friction and the mar6v,zjqw47u j 2zn- hkss of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force of l ; r o9gcvf6lha.l1,l100 N in a dire,9oh.cr llf1l ;ag6vlction 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 o aeuu vy6ckoskm726-6 ,-yizof books 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 booksz a6 okmk6-u-ye2 voycu7 i,s6 is 40.0 kg, what is the normal force on the box?

  A traffic light of weighei / oc4vn7 h/zi ;lfa74h0uygt 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in g la4u0 nochi/7vyi4;efzh 7/ the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, whcs7 0*71gvwn( iypd2y9bqs2f u hyyj. at is the mass of the trafd1nb2 ycuqpswh7v.yyf 9s 70(g jy*2ific light?

  Two boxes of masses m and 2m are in contact cv7a* 6 wguxz+with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration6aucw *+x zgv7 of the more massive box?

  Two boxes of masses m oz4msifspnonz7pbf/ 17k 4iakq8 0:)and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is thfobqk f ):8mpnpisa znkz i/o4071 7s4e net force on the more massive box?

  Two boxes of masses m and 2m are connecc:jz*ko-1(jnp7 cl nqted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, wpck *ljn(n1c:o -j7qzhat is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fzd+q1 dbb y*:vig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the lessvq* +1dbbz:dy massive box?

Two boxes are connected by a cord running over a pulley as showjhyde8/v:l rno ky4 1(n in Fig. 4-5. Box 8o:vd/ ey(knlr41h j yI of 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 6j g *,4qjic(ft3hfdi kinetic 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 force is,j 3dh*4 cifijtf gq(6 applied to the box?

  The coefficients of static and kinetic frictionsp2qp/z5i v 3.w4ypgpds,6c jl for plastic on wood are 0.50 and 0.40l/26jvsppiw 4z pgpq, .dc35y,
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 direction. It slows and comes fl igo+w/6o mvdip*5 vi/9mz*to a stop with a constant acceleratimmf/vv*i9/* il o i5p 6zogwd+on 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 sur,)m 4v ;kip6dn, z1xnofjlx;dface is pulled by a 5.0-N force. A 3.0-N friction fork, of zlmp6x;j nid4)vd ;1n,xce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates -e 5*zuew94)phniqjg9i -d uza 4.0-kg mass, from 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 4-*8:rb aae 8t-ywpkm e:mkneinitial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between th-4:a8m*e 8t-kerymewp:n b ak e puck and the ice?

  During the investigation of a traffic accident, police find skid ma rb1d4o ih(x7d*o(dfv rks 90.0 m long. They determine the coefficient of frido7rvb dxf*io(h 4 d1(ction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are sta 2y1t2 mogo 78bpz,iipcked. (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 massive box, what is the static fiy8 zp2m ti go1b,o72priction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betweenb b drq; (-qfps1xv2e3:nf(t t 1b ntvqf;pbr32:s de(ft- q(x 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 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 arq sv88b9kmj3)iufj(ngle of 88 fm)j(kru i3 qjv9sb$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that m 0 lbcw9:h- k 1y,qwo4afbz4p 0hyx5hfakes 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 *gr , cxg:fxlc:u* lm,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 inclizl 9zvnn ;f dt--k53tlned 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 d;f. fo s f 1qag434l3mj8pvddairectly down an inclined plane, at a constant velocity of 6.0 m/smv3.p d4oqff l8;f14agj 3ads.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a maskb)b)/ hi 47t rzoxjof23nh0t s m slides down a 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 slcb,j. duo2ycz/a e+d 2ides 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 rough surn-sfn b4ov.nzp sjo-l*.j1b8 j bur;-face. The cable attached to b-of-v-sr j.j;nb*.o8n lpnz41ubjsthe 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 rese8uf fo,6axn6t on a rough inclined plane tilted at an angle ofe,6fa68u fo xn $33.5^{\circ}$ 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 oa 3(26coh*dj ak38ui/pqee0 ohj.bwm n an inclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which thum /3ib2a*eh(o 0. jcq 6 w8oeajdp3khis occurs is q. What is the coefficient of static friction between the object and the plane?