Which of Newton's laws best explains why motorists should buckle-up3yjtijvzo v. 4x 3m7t+?

  When you sit on a chair, the resulle2ns) /nyh5 rds b26y2ui y-stant force on you is

  In the absence of an external forcmlx-76 zip 0*h g;,5gbaj vwkse, a moving object will

  When the rocket engines on the s,2r+vcf b2gk: di0aeitarship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in emperic:,k vi2bg+02 af dty space, the starship will

  A rocket moves through empty space in a straight l;drn g:tl m71tj 7mst6ine with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, lm1dt n6gsr;7mjt7:t the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall fyar36 6uk as./ gbnhh1orward. You can imply from this that /s.aub hy6h36 ka 1ngrthe bus's

  You are standing in a moving bus, facing forward, and you sudb4dyhb lfw;+*6 f7o0amw5o a gdenly fall forward as the bus comes to an immediate stop. What for;f*d+5l g am76 boa0 owb4wfyhce caused you to fall forward?

  A constant net force acts on an object. Describe the motion of th.u45xkd. jxu b*-w lfke object.

  The acceleration of an object is icxjjpk/n8 1fzd3 * k;-sz omdug:ng 7,nversely proportional to

  A net force F accelerates a mass m with an acc /o hx;n6z-ebtt-5ysueleration a. If the same net force is applied to mass 2m, then the acceleration will bbz hso;te-yt- u x5/n6e

  A net force F acts on a mass m and produces an acceleration a. What accwngmiekf:v (0 4z0qa2 eleration results if a 0fw vk enz:m2iq0g(4a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloo kq+dvpziws ;-xux8m2.o1i x4b 4s yb(n will fly away. This is an illustravs-q4mpx4x1 yo s+( ii k2bzud8b;.xwtion of

  Two cars collide head-on. At evermr0h 5u1:flbr39ol(oemy rp 388s6 rser/q mby 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 exerts on ro/h 8ro1 3rb9upr0erle8m5s q l(f bs:ym63mthe first. This is an example of

  If you exert a force F on an object, the force which thesmoyvvt g-xk 095 s.e. object exerts on you will s0 ovxsgvk et-y9m..5

  Action-reaction forcq5rai,a(tv 8p es

  Action-reaction forcesqxga6sn +ikvb* 8/ceoc; 9r3k are

  A 20-ton truck collides with a 1500-lb car and causes a lot of dam4j8yh axx: sbi9ea6b- age to the car. Since a lot of damage is :bex j4ahxay-i86sb 9 done on the car

  An object of mass m sits on a flat table. The Eartki9m(m3xkd q)a j*-at h pulls on this object with force mg, which we will call the acti9)3imadkq*amk xj -(ton force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a s)l lg:joz l xbw,(i3:btring. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action oixl:zb3b, w:j l()glforce," what is the "reaction force"?

  Your bat hits the ball pitched to 6z85 9bf.b 2 aqwgpkqbyou with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude gazqk fb b.w689pq b25is

State Newton's threes o:e: pno2y1u laws.

  Mass and weight

  The acceleration due to gravityimj q(o4;5efrsunbpvz h.x 1t5,b m;4 is lower on the Moon than on Earth. Which of the following is true about the mass and wis( hez 4;n4x5jmpmrv bb;. 5o,quft1eight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distancrkepke0enydxs x 011x6) 7w *ce is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weig.60 mc .ks )af b8lv1zodkwq*phing 606p0md8f*abksk )wzo. c . q1lv0 N?

  A stone is thrown straight up. At the top of its path, the net f9q2ff5i4fv eoh d )4*kxcu*b6 h .lhuyorce acting on ievx)hq24 ilduh5h6uy4 k9fcf * bf.o*t is

  A 20-N weight and a 5.0-N weight are dropped simultaneously froaak+5r)sy ks6 0h x*kym the same height. Ignore air resistance. Compare their accelerar h*k5a) ys0s+aky6 xktions.

  A brick and a feather fall to the earth at their respective terminal velocities.9c jt6m-x0uzt Which object experiences t 6-m09xt uzctjhe greater force of air friction?

  An object of mass m is hanfu yieq0asv,cr6x )5q 8 (jt+kging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the strin+ fui)qs q6 ayrt v,08jx5(ckeg?

  An object of mass m is hanging by a r6f9-g 7f spczx.j8loi cnzjz7q0: 0tstring from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the stl0oc z-fqx: czf.irjzn 776ps g98j0tring?

  The force that keeps you fro 0ejvr,j v8sm(m sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it a)uwm+yodhi9c b : )ec6f+ecl+5js6gis to keep pushing it with consta)69g+f:+ obhesdic5je u6) c+m wlya cnt velocity, because

  A horizontal force accelerates a box fro2aerf wq-8)deu.k: , vv le6hhm rest across a horizontal surface (friction is present) at a constant rate. The expe.2d-eavfh uhq,e e)rl 6v8: kwriment 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 inclinp.vz2 * aai(e+-jao/k0 wutvm;z yh /jed ramp at constant velocity. Thus we can deduceoka/i jz2 e ptj.0 huam+(-w av*/zv;y that

  A block of mass M slides down a frictionles0s )na4; dwow9d c4frqs plane inclined at an angle q with the hr0c9ww asfd n4o)4 qd;orizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plaa:xqddj lkb-:ohwm,: i3,h,kne inclined at an angle q with the horizontal. The normal reaction force exerted by the h, qom a:,:lwk3id:-bdjkh,xplane on the block is directed

  A block of mass M slb+m wg/lr/vfhe ;bg)4ides down a frictionless plane inclined at an angle q with the horizontal. The ;v/+megb4)f/ hrwglbgravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclinedrdwo3x/ md.4jmu + nt: plane that jno m d.m4rd: utx+/3wmakes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictiogm gsyoa8 h)c *;n5y(iage 7+hnless surface. A 16-N force is applied to the object, and )ag(*5yns8gc yi geh+;oha7mit accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest kd q4rh 84;m :,erurr:o1ofy tto 27 m/s in 7.0 s. What is the average forward force on the cary8;ud,tm :fo4h rrokr1eq: r4?

  Starting from rest, a 4.0-kg body reaches a speed ofr(9ub8my)n;7v f: keq p*upgb 8.0 m/s in 2.0 s. What is th kg:yp nr8q()b9*fpueu7vm;be net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed l geb24aq3adw - p;a7f.nr:.7e wlwec of 50.0 m/s aftrf4ewc:wew7- l da3gn;.a plb2.7 e qaer traveling
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 pjyr- :8tan.g) sm:o lfush a 10-kg mass from ret.n lgmo: yaj8fr:)s- st,

  What is the mass of a person who weighs 2dxlx+/n p9qg 110 lb?

  What is the mass of an objlqo dk9vjiw/3 u 46wf7ect that weighs 250 N on the surface of the Earth where the acceleration due t364vlwodkqiu/ 7 wjf9 o gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg ongqs.m u17xw. ;9tr:o9kephup the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is r91sougm q:e pup;7 .9wkxth.only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object z +fb/:7rxmpi B weighs 40 N on the Moon. The Moon's gra rz+/ pbf7i:xmvity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg4.egn);dl(i y +oamyo rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerane)o o.gda m+i4( ;ylytes toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless sua b5sz,n:nr i3rface. A force F acts on the stack, and it:s,bnaz5 i3rn 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 the13g8 a:(cc v,56yy prwid 6eh7am wggv scale be reading when the elevator is accelerating doym v,wai6rwdpy1c5v7e 6h8 3acg:( ggwnward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is(sgsqj8 q l+9m 60.0 kg and the elevator accelerates downward l(j9 q+s mqsg8with 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 mass of the person ivwe vqjj*2e0 o*s6p/us 60.0 kg and the elevator accelerates upwa* 0 /uwpv2j6jvees oq*rd 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 forcej3(adb q 9a;v ak//odj has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. Wh3/ /aqaj ;do v9(jkabdat is the acceleration of the mass?

  An object of mass 6000 kg r -6lpkc bipm2/ests 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 trave26/ lkipmc pb-ling 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 to6zzo;bb iun80.fk 0xruck. It is held in place by metal brackets that can exert a maxf6bxiok8o0 nuz0 z. ;bimum 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 the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60p 6mbi:vp4nsi m 2./iq kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and/qnvbi4:p 6. s mip2mi the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1,gha.sg na bwpi;3;q16.gfg4 x if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of.qni6wgg4.aah;x gp bs3f1 ;g the pulley.)

  A student pulls a box of books on a smooth horizontal flooro yc0vq .o2/f 2d.op1/amkjfl with a force of 100 N 0/ .va2oof/ydqlj omc1k 2f.p in a direction 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 horizo(ri*s s *yf5b)jo(xoantal 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, what is the normal fjyra) s*b*o(5(iosxforce on the box?

  A traffic light of wefi9fy-o mp:f5 ight 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in th9-fio5f yf:mpe ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass ofk*)kl s/l*ya w,9t okm the traffic9k*sy o tl*/wak,)l km light?

  Two boxes of masses m and 2m are in contact with each other on a *ml zs 4/j ,m q4)ao4sjt4ae gzbv-m5pfrictionless surface. (See Fig. 4-3.) What i) b4sj4/p qtvzaao4ml5* 4memj -g sz,s the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionlesyxw235ygy mf 8s surface. g5y yx 3fy2mw8(See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connect (meq+gga+ maeesr0.0ed by a rope. (See Fig. 4-4.) If the foqe+m a.ga0 0+m gesr(erward 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 Fy+ :9 hs.(hyhq(lu2/wig9k * fntrqgwig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the leqf.2:glqwyki /ny9g*9 +(hst (hwhruss massive box?

Two boxes are connected by a cord running over a pulley as show2 pb0lbj3cn51pd)dw 2za h0ken in Fig. 4-5. Box I of mpcnab1 e5j2plz0bk0dd w)h 3 2ass
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 z z +4bn/g .cneuiem75a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when +74 nce5. zuinzbe/gm a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on woo8sy,7/kdg+:w1z cwpuxa+bz kd are 0.50 and 0.ckub z7gpkza :xs/+ d+1w8,yw40,
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 direcw4hk8o mtv4+f :/zo/qxa 5t hction. It slows and comes to a stop with a constant acceleration of o4w +z fh/omk:htxv 5qct8/a4-$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizon4e5p4bb (dz mntal surface is pulled by a 5.0-N force. A 3.0-N frb4bd e(m 5n4zpiction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N g;gw ;hj.3orn.ej1q/k qiyy )accelerates a 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 initialjn+u nm y:i e;bs9j-2o speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic frict imo;+us-9:ne yj2bjnion between the puck and the ice?

  During the investigation of a traffic accident, pol/r u)bi8qcurs18a,*q yl*k ca ice find skid marks 90.0 m long. They determine the coefficient of fri /*uclbu ca8)8qa r,qr i1ksy*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 stacked. (See Fig. 4-6(gs- x aqjgqouuz:0c((5h p*m.) 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 friction force on the lajh u x5z -q *cg(g((puqm:0osess massive box?

  Two boxes of masses m and 3m are stacked. (Segng::svu++ufou8 +qa e Fig. 4-6.) The surface between the more massive bo+ f+qg8uvo :nasg uu+:x 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 incli ccz* lxs753 ys2lq8.cz4qi csned at an angle of yxcsczqqc5z i8ls.43* 7s l2c$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat) hqxo5hc0o( cwbu+y( hill 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 cfp ew87b. +-an t+uziinclined 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 inclined plane tilted at(-1svuzb:4f7 (txhykga dpf sbdp7 05 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 sjf c8pfh,.w* an inclined plane, at a constant velocity of sw,c.8fh* pfj 6.0 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 a8.mw cpfnel,* d7 .5zg ggj4fc 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 slides down a rough -xh.b+ cq9fm m$37^{\circ}$ 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 502fx8 6x pqgkdl0 ijl8/0 N along a rough surface. The cable attached to the log makes xi2kj0x dl8g6pf/l 8q 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+xmbeu64z , yk from rest on a rough inclined plane tilted at an angle obxu+z ,em6k y4f $33.5^{\circ}$ 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. The angle of incline is grad.bg - hu +u9d-goz0mleually increased untilde b u.gmo l0--hguz+9 the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?