Which of Newton's laws best explains why motorists sh4xqe eei(3yul5or+ t1 b3,yw could buckle-up?

  When you sit on a chair, the reu;txd+) v k,uhsultant force on you is

  In the absence of an external force, a moving ek;4hsckz 5noc,po ;*object will

  When the rocket engines on the starj )ywr9)s a;-iswl, .jtwvsa2ship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in j.wy;jsw rw la9,)sv2)s-at iempty space, the starship will

  A rocket moves through empty space in a straight line with constant spemj egk ./4ofy7/l(xfr1 hpl3xl9.wkhed. It is far from the gravitational effect of any star or k3o jp l 4.wf71x.h/( 9 gymfel/xrlhkplanet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a movingh:-r gorvmtrkb+ *2n9 bus, facing forward, and you suddenly fall forward. You can implvb m9 :2+g*ronh-ktrry from this that the bus's

  You are standing in a4;dn.6rt llzd moving bus, facing forward, and you suddenly fall forward as the bus comes to nt dlr ;l.d4z6an immediate stop. What force caused you to fall forward?

  A constant net force ap3-*)h sy2hl ;zmau lfcts on an object. Describe the motion of the object.

  The acceleration of )y;ljg(hue. 8iyt5 l ban object is inversely proportional to

  A net force F accelerate-pif6hme(- dy ldw61dw k 0yj+ q(phjd99/vfc s a mass m with an acceleration a. If the same net force is applied to mass 2m, then the accd (q-( 1mkw h/d6vfh9l f-diw+ej0dpyjc 9 py6eleration will be

  A net force F acts on a mass m and produces an acceleration a. What accm7v:aaz 2 nk *a)kqe)qeleration results ifeznm7q2v *aka) k:q)a a net force 2F acts on mass 4m?

  If you blow up a balloon, and then repq.2lp-y4 v:vign wv )o;s1ndlease it, the balloon will fly away. This is an illustration osdvo:ppwq2v ; -l)1v gni.n4 yf

  Two cars collide head-on. At everyslx 0z dzdr 1 x:k/94dkgs ziz;lv+1-o moment during the collision, the magnitude of the 0r-i91g;/1zsdkx l+vl dkoz4 dz z :xsforce the first 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 object, the forc:e(fv- ;hb/-ivbn pfx/n 3 dqie which the object exerts on you willefx(ndv;/b-:ifn /vq3 h-bip

  Action-reaction force ie f7z/od1k/xwfly*z(ak 4:l s

  Action-reaction forces arh+yl6li4 ,ick5,c 5 zvln)up re

  A 20-ton truck collides with a 1500-lb car and causes a c;88i geo7dke. :i jtulot of damage to the car. Since a lot of damage is done on the cargk:o7;jt8 e .ui8 idec

  An object of mass m sits on a flat table. The Earth pulls on this obj-i 3oid1 aom1i8.bmobect with force mg, which we will call the action force. What is the rem8bi- .mboi1 d3o1ai oaction force?

  A child's toy is suspended from the cer,pv7 9+ia eysiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "activ s7 ep+9i,ryaon force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantawisxu pg r;9)nw0s2dgy ik //0x6x/d xneous force. The ball hits the bax2n) /isgw d6xwrygk0p9u;s0 x d /i/xt with an instantaneous force, whose magnitude is

State Newton's three laws..zvqoox )a 09v

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Eaao9l i1we:. tirth. Which of the following is true about the mass and weigho 9.e:ltai1wi t of an astronaut on the Moon's surface, compared to Earth?

  An example of a force covb5obo-,01 j )ndl9:qt net/zb+h jwhich acts at a distance is

  Who has a greater wek 3 kel 4nt7:be8fjmp:ilg+n5ight to mass ratio, a person weighing 400 N or a person weighinglm3n7ipel5n:ekbf+k 84 g tj: 600 N?

  A stone is thrown straight up. At the top of its path, the net forekx5vrqkn* 64); li2+y ozbf xce acting on ikyxi o*lr54e 6+) bzvx q;kf2nt is

  A 20-N weight and a 5.0-N weight are dropped simultaneously fro*)el+rih c,h lm the same height. Ignore air resistance. Compare therh) h*+l,clei ir accelerations.

  A brick and a feather fall to the earth at their respective tesievkmk) 10q s 94lg7srminal velocities. Which object experiences the greater force of air frictk71qs9sis vg0)m lek4 ion?

  An object of mass m is hanging by a string from the ceiling of an elevator.p9jc fm(u*(ku The elevator is moving up at constant sup( f 9j*kucm(peed. What is the tension in the string?

  An object of mass m 6k2:doq- yq ndis hanging by a string from the ceiling of an elevator. The elevator is moving upward, d n qqko-y6:d2but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewalc(wdc*y:ij o,+dxfaq8c 2u x;8n)if xk is

  It's more difficult to start moving a heavy carton from rest than it is tonj . agdp+inj ;g6mk+4 keep pushing gdj4g +6a.;p nj+ mnikit with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal s -kmu*w jb,.a mmg yj-1fydr;(urface (friction is present) at a coawmm-jm.d1b-f yjgy,*r;k u (nstant 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 acceleration?

  A packing crate slides down an inclinj5oxq r.y w4)lvmop21 ed ramp at constant velocity. Thus we can deduce t5 jwoq)y xmlp42 rv1o.hat

  A block of mass M slides down a frictionlk v 982*pmb6hn.ndrc eess plane inclined at an angle q with the horizontal. The nor re*2pbd9ck hm.n6v n8mal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle qo+af kx 5+q om0jmss+- with the horizontal. The normal reaction force exerted by the plane on the block -5a0k+fooqm jsm+xs+is directed

  A block of mass M slides down a frictionless plane inclined at an anglet ;ugcem s+zltl/e,+* q with the horizontal. The gravitational force is di;,u les+z*+tm/ec tl grected

  Two toy cars (16 kg and 2.0 kg) are re 3o2spu n0*6pczoc(ohjbhh40 leased simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes h6bphc*42o o jzhp cns0(u3o 0their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appliex dmqecn2 bg+42pm)pdg1 mnz8p7r5 i)d to the object, and it a4qprpeidmn m7 g1cnz5bpx28)m 2d g)+ccelerates 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. bv)-ms k2dy3t What ist2k- d3mb)y sv the average forward force on the car?

  Starting from rest, a 4.0-kg bodya jq1cvxvqe/5zy 2b45 reaches a speed of 8.0 m/s in 2.0 s. What is the net forcex5z 1v2/bjac4qeqyv5 acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires d3 tdx90uz)j*u .i,bolixq ,h ogs;.q a speed of 50.0 m/s aftlx s ;0xt9d3zohu b.,*oi ,qqjdu )g.ier 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 push a 10-kg mass h*)fgfr9l-vg from reflh)*f- 9r vggst,

  What is the mass of a perst+f3 .vtwf+om kaus68on who weighs 110 lb?

  What is the mass of an object that jqfs0tj 9-h rt l)b4-rweighs 250 N on the surface of the Earth where the acceleratbrqsh 9 t4-)- j0fltjrion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg oxb :cl1e+0 zepn the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6ez+c0:1xpleb of that on the Earth?

  Object A weighs 40 N on Earth, and object B weirg 9w73v+d* w)p ncje7+2xe3 kregrsv ghs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of t9vngr e grd+2je7w33 v*cks7pe +rx w)he objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg rop.3eyfrk7cm vee7g:e (,wg 75/cmiutye. Suegev .efkiem:3, 7ctw7uyr /myg7 5ec( pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on qu flwdrud r2ynf6p9ph(9) m779(ilg a level frictionless surface. A force F acts on the stack, and it accelerates afl97u (u( hnm9rpi d2q g lpd7f)69rywt $3.0 \; m/s^2$. 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 scal2;aik 43snmi:os3 bhme in an elevator. What will the scale km2s3a m:ob 3hiis4; nbe reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. btgb-ul7fok**,ww c9 If the mass of the person is 60.0 kg and the elevator accelerates downward f9*u lctboww-, 7kg* bwith an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevato dg73eof t;z,wr. If the mass of the person is 60.0 kg and the elevator accelerat dt;o3fw ge7,zes 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 au6twx( bn h* w;nl3q9ind is directed due north. The second force toward the east has a magnit;h 9nwiw36t* nxql(ubude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a a gcrye c(:7o,3 ymnd8truck. 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 distance if the load is not to sliyayreg n:d3o , m7cc8(de forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a tr9ef *d;(fbs zas84e ymuck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling;sefyad z9b fs(m84*e 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. 4-1nzd0p 9batnimdc1 / 6/gz0s+ u, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the /z0z10bd pam+ndu9gsci6 nt/ mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg a+csp6at9nmzs xkz5/ zk;*d n4zqbs45 nd m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the mn szk9/ ;4st+b 5zdzck x45qzans6*ppulley.)

  A student pulls a box of books on a smooth horizontal fl5hs90rh m9za j7uj4w loor with a force of 100 N in a direchjr 4u99zhw0ma 7lsj5tion 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 fl1z1 jer3o1hxb /pvd y1oor with a force of 100 N in a direction of 37.0e above the horizondry e1 vb13h/xpo1z 1jtal. If the mass of the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight s+/x j/hdn3l-i1 d qrv100 N is supported by two ropes as shown in Fig. 4-2. What are the tensi -/n+hqjlrvi3sdx/1 dons in the ropes?

  In Fig. 4-2, if the tensions in tihk( +ait9 tumx*7/v che ropes are 50 N, what is the mass of the traffiimh/7xt t9c akuv(*+ic light?

  Two boxes of masses x ry81mx d7ag6m and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the accelerationgmar876d x1yx of the more massive box?

  Two boxes of masses m and 2m are in contact with each other ofr7weyv(// in a*(b c+y3q/6ijyl vdj5swc3jn a frictionless surface. (See Fig. w b3a i/ n(cwyclyjr/jfs v/3 qv(ie+j6d57*y4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m a h 45fx2tso:ouc/f+hzre connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is Fx 2 +:ouzth csff5h/o4, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connectel spd -r(jg(b2d by a rope. (See Fig. 4-4.) If the forward force on thr(pld(2bj s- ge 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 as shown in Ficj0sbxk,m(*w r;n6sy g. 4-5. Box I ox n(sbw,cr0j*s m6yk;f 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 betweenkj ,l jxm/(0kxir2ury6lc7d/ 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 u,r / d0i276kjc xmrl/(xyljk applied to the box?

  The coefficients of static anhc;0f*:qik cedr ;pf2it9w) kd kinetic frictions for plastic on wood are 0.50 and 9 0)qf;wdh2c:pk* rtcfkeii ;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 2mwwyd wo r 04qh.-3cpa level surface in the +x direction. It slows and comes to a stop with a constant acceleration .p rdch2qw m4y0-o3wwof -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pul;jxnnu gpo4(f7.smdq v m.. m-2hc+d gled by a 5.0-N force. A 3.0-N friction force retards the motion. What is thu qp;njs2 fn.gd+vm 7- (4gx.momdch .e acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, fwj+eyww8 e s4* fx1f5crom 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 10pztcby-,b2cv itb:-xpb m orf+4, ,b; m/s. It slides 50 m on the ice befoc-rtb,4bzv2-;x p+fc obmyb,ip t :,bre it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigati o :qu/4y,igyzy2dj6v lrat3r q+3aa6on of a traffic accident, police find skid marks 90.0 m long. They determine the coefficientyra 6o6gt3rqz+ a2jv y / qyl,ui3ad4: of friction 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.-n p vy q*rt bd2onl3bj57w7x7*8t avj 4-6.) The surface between the more massive box and the horizontal surface is smooth and the su 3jbw7-*2 xby*rv 7tnqt7oa 8p5vln djrface 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 stackedihbfqlvq5iv; r5.2n 0 . (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 coefficientrf iv0h5b q; nqi.vl52 of static friction between the boxes?

  An object is on a frictionless incline2vm(/y jpchpv+sv,(8him 5 ihbgl:s; d plane. The plane is inclined at an angle of/hl ,hs85s(2;y (v+phiv mmijgv cb:p $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angllz)o6 emi;i/lknmg o79c ;zy+ e 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/j 4b x xc-opj l.vcjg7kg1:kz.,mmh2 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 atq tpou9-l.k39lc 9rt p 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 constant ,iwffsr2 cf8x 7vp8;dvelocity of 6pw2xd;8s r8 ,i vfc7ff.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 2fwe3 pjjz9btu s s, vb)h4q1(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 slides down a rough u2ye,otawb+rbi c x:ul6-2s* $37^{\circ}$ 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 sf6g,vp23 kvtlurface. The cable attached to the log makes an an2l, pg36 vvktfgle 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 pladc w79-ce0cvycv 6ko4ne tilted at an angle 9cyec40-6w cdo7ckvv of $33.5^{\circ}$ 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 o2akuuhf9-g s3u,k f5g f incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static fr,2k u ffh-39u asgukg5iction between the object and the plane?