Which of Newton's laws best explains why motorists should bucso9ngifi2;hx0gl zj+g 8lk7 4kle-up?

  When you sit on a chair, the /fyv+.skd0 o3tpgo/4y* fz ah resultant force on you is

  In the absence of an exter5.9dl.ous x;: b omuul w+q vyqir2*0rnal force, a moving object will

  When the rocket engines on the starship NO-PAINun- n67vawmll buxzh0m3w1:3 d/ ed9t-NO-GAIN are suddenly turned off, while traveling in empty space, the stwu l-m633 :me0v1ax t7hnu9ldwz /dbnarship will

  A rocket moves through empty space in a straight line with constant speed. / 3zvvqc1u 1n,kqj2votl, d56gj bm*i It is far from the gravitational effect of njvqu,52i/qo dl,bkt1gcz*13v v 6mj 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 moving bus, facing forward, and you suddenly fall forw/2: nawdwsgq* ard. *q n wdsgaw:2/You can imply from this that the bus's

  You are standing in a moving bus, facing forward, auoa u:hg u.f0.3yn4cv4 eohe9h-ng s.nd you suddenly fall forward as the buun c eae9hgf4 34ys o-v.:nh0o.hu. gus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motionybf2v4ho nj)vs *,*si of the object.

  The acceleration of an object isut;x 4 yp.uo-g inversely proportional to

  A net force F accelerates a mass m with an acceleratzwlkq)kj4 w.2fn gp;n: n3hg )ion a. If the same net force is applied to mass 2m, then the acceler p23lgq))jk:fnn hn gkz4;.w wation will be

  A net force F acts on a mass m and produces an acceleration a. pm)d3k /rj5n)a 2kamg What acceleration resultsa2nmmdk3ak5 )p/gj ) r if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will c l xrw8si6k8n:5kp9k; ( fjgqfly away. This is an illusngwc9xilk s5pk:qf6 k (8j;8 rtration of

  Two cars collide head-on. At every moment during the collision, the magne/7xecei4c f +itude of the force the first car exerts on the second is exactly equal to the4x/ e+e7c ecif 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 force which the object exerts on (8 oa*o4z mvy1f r+gauyou wil84+*zf vay o1oau(gm rl

  Action-reaction forcesbnnd4a b3; bh* 7kyve6

  Action-reaction forces arv28 z)c56eqj.ww avh xechy,) e

  A 20-ton truck collidnb q me5w,/ ;lrso4,exes with a 1500-lb car and causes a lot of damage to the car. Since qx/orw,s bel;,m 5n4ea lot of damage is done on the car

  An object of mass m sits l9ytj;lv.qw;s3c gs 2on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the rea t ll;9 gwqc3.ssv2;yjction force?

  A child's toy is suspssrr3re35xu*o4e) *si2 hh 6lq jvcw 5ap(zr 0ended from the ceiling by means of a string. The Earth pulls downward on the toy with its weigh6r hr3 *e s a4 *evqjscwl)s3ih5o05r2rpxu z(t 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-N instantankh jve*hxx .nsixq5; nq-7 )*reous force. The ball hik s. x7q* j)n xq-;xn5rhv*hiets the bat with an instantaneous force, whose magnitude is

State Newton's three laws. ;* k0yae7u2kbejz1 na

  Mass and weight

  The acceleration due to gravity is- e,lgwtg,7jxt e0su;+x 2vqx t9 mcv2 lower on the Moon than on Earth. Which of the following is true about the mass and weight of an ast7e ev2g+ucw9x ;qjx0- x2,gvstl,t mtronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a d.d h)dv( ;5ydh-(qrwhu /ny lkistance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a persono ityww7 xle69n9 pw,2manew p.c 5ze 9-)vyl4 weighing 6 ww7.4yaep9l,x-v ne teyi2plz 5m9ww)9 c6no00 N?

  A stone is thrown straight q emue1,v 9v;n+b0.*vsxu9 iuaa kf*hup. At the top of its path, the net force acting on it,ea;v uqs. f0n *ivvu*emk9x b9h+1 au is

  A 20-N weight and a 5.0-N weight are dropped simultane5 fws+x,xus pm/;5 errously from the same height. Ignore air resistance. Compare their a+ 5/xrsf;m ursxw 5e,pccelerations.

  A brick and a feather fall to the earth at their respe 6( q3ufv9vo hf8hx:gyctive terminal velocities. y:gvx8 fqo (96fu3vhh Which object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceilingfywxmb5b z171 of an elevator. The elevator is moving up at constant speed. What is the tenzmf5x7y11bwb sion in the string?

  An object of mass m is hanging by a string from the ceilie..-y w.pv,j3ew:y m hdjg 6nb cm/l;qng of an elevator. The elevator wy.l; :c j/gmmp ede6,j.y- .3wbhqvnis moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewasp3+yc*ver; :l mw zp8lk is

  It's more difficult to start moving a heavy carton f4x+n p8hlfqmrg/ e j54;1ptx r08mxnbg.su v ,rom rest than it is to keep pushinglrfmn mvr/njueg 4850t.1q 8pxg ;sx,b+ xph4 it with constant velocity, because

  A horizontal force accelerates a box from rest across hewe 5 7e )z9ji8fun(ja horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the) nfj ewe7ui 85(z9jhe exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an 0w wvev/7jy3n inclined ramp at constant velocity. Thus we can deyww3j/0n v v7educe that

  A block of mass M slides00hm3 i-.mhp,fhomal -e ga w( down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on m-oafp3h0,hhwm la g.i- (0 emthe block is

  A block of mass M slides down a frictionlerk2(w kg) goz-ss plane inclined at an angle q with the horizontal. The normal reactiookgg 2(zw-r k)n force exerted by the plane on the block is directed

  A block of mass M slides down a y14 0mf6ksnz 9vr6ffmahza 4* frictionless plane inclined at an angle q with the horizontal. Theyamm1 fr946*zhf 6 kvnzfa 4s0 gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inc.2aj ( +ncl2ci;vbqwdlined plane that makes an angle of 30e with the horizontal. Makeb qa2jcil2cvd.;wn+( a statement which best describes their acceleration after being released.

  An object sits on a frictionless surfacaco7 9ry5ux4b v6x9jw e. A 16-N force is applied to the object, and it accelerates atyaox96xu97rcjb 4 wv 5 $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/ (-faocr+1jok;w/ aqh s in 7.0 s. What is the /r(hfjaqk;oca+o w -1average forward force on the car?

  Starting from rest, a 4.0-kg body reache0 a kr3maa ku10l jedq*d(5-sus a speed of 8.0 m/s in 2.0 s. What is the net force -3usjk0 kuqa m1(0 adl* reda5acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acdv3dxv zv 3)a5ynv:0bquires a speed of 50.0 m/s after0d)3 3b 5v:avdxn vyvz 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 p7jrld5y -4)fhr icqx)ush a 10-kg mass from rest,djlhqc4ir-5) x yrf)7

  What is the mass of a person who weio2dubr 3)z+ r et,3llighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Eamh :u oqp7ddbwpuq p3b ,32ku n6/ut:-rth where the acceleration due to gravity id qqup3pk 6,w uhub/dmou7t2:3 bp-n:s $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass oftrsvhf2v tf53k - q-l5d4flg -rt1sx;5rbz ,g the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of thatgqtsf f5b- t vs-5d3l5x-gvl2tz1r,hf kr;4 r on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moo9 6ynn nsv4 wjsqbe::((e- bj+r5jmi xn. The Moon's (nwb:6(y5 -r :bxn4es+9 qejis v nmjjgravity 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 .sqzq n/vn0 h12 q,vnsof a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward vs nv20n. qzq ,ns/hq1Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level fh h ,4b7qsrpo1rictionless surface. A force F acts on the stack, and it acc rsqp oh1bh74,elerates 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. Whawque 3e/c r 3w15j-:5l.wmpt rfqf6h vt will the scale be readqrwmw -5/pqh.6ew1fcf evl 5 tj:3r 3uing 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 i-ep4qfqc)l.:hxn zqj; .rj jssv; ( w+d5zm 4ps 60.0 kg and the elevator accelerates downward ).;s;jpq. 54m:rd 4qsch(qnvpl +wexzjj-zf 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 the mass of the persn :imsh ue88j9pyyr) )on is 60.0 kg and the elevator9: jy p ruyi88nme))hs 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 mag+dwtxl/v+ 7h8vcc j9 gyot:v8 nitude of 8.0 N and is directed due north. The second forco:tg tl+c vx7 9jh8w8v +cv/yde 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 xuzy oy -a)l3vlvj8sf2- m 94dheld 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 stoppiny3zlo 9mfv- )l8jx -sy dv24uag distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a tehxyx63 v(.;wytao+ sruck. 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 mita wy.;yxhs 6e(vo3+xnimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine s3+kov0.l1lm 6uxt j1sm x9neg hown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the.9+ xg0lm1 j6u mlvs1nex3 kto 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 = 0.40 kg, what aq4 r1khh6;2 umznhq bc- 0 y7jly;;xwis tab-qmu;kjqc027w6 4hx zhy yr;;n1 hlhe tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of boofxr5j7 b 2 dzma+)28jvmv -kjdks on a smooth horizontal floor with a force of 100 N in a direc7x)j+ bv 5rfz d2m -ja82dmkjvtion 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 flo2w7oug57y ga3a5h1p(n nt ouvor with a force of 100 N in a direction of 37.0e above the horizontal. If the maahyp3 vw(go 2a57o5unn71gu tss of the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported l 4aqw ect)f se182x,dby two ropes as shown in Fig. 4-2. Wha 48xaw2l)qee,d1c s tft are the tensions in the ropes?

  In Fig. 4-2, if the tensions in t nd4n5q3im q-hhe ropes are 50 N, what is the mass of the traffic lqn dm 43h5qni-ight?

  Two boxes of masses m and 2m are in contact with each1abqk5- t oe-5vs*lqv(;tf vm other on a frictionless surface. (See Fig. 4-3.) What 5f*ko5a-l m vqs et;t(vq-b v1is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact qywwlo0 1k 6v,with each other on a frictionless surface. (See Fig. 4-3.) Whatw6qy vo 0lw1k, is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rosu k;uw .q5g90z)sw0kyqlsf6pe. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting g)s 0wq ys9z6q sw0u5.k fklu;rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the :btbsizvs j si 8vtq* 17)5uq1forward force on the more massive box is F, what is the accelerat1 isbjb:si7v*z 8uv5t 1qs)t qion of the less massive box?

Two boxes are connected by ah0z h:by)wbs9oh s5j bh+7cq) cord running over a pulley as shown in Fig. 4-5. Box I of massb )7zb9cqh0jhbwh+y :o5 sh)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 k:i.ppo izkk3 2j-jav; m+,yz+te h 7jvinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on + ypt o mk,p3-ezvka.+7ji;i hzv2jj:the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plast64zw;ydao*nb* l( d sxic on wood are 0.50 and ;n 6*sax(b4oz lywd*d 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 +(fcwp9ux/ .nrr-zf7oqit x,3x direction. It slows and comes to a stop with a c9x xwp-. c7qi ,rz3ro/fftn( uonstant 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 horizontalnw,c cy66oxa ofd+f;( surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceley,;f 66 c dn+w(ofoxacration of the object?

  A horizontal force of 5.0 N accelerates a qw) edfpt1)1n4.0-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 initial speed of 10 m/s. It slides2n5 oe hsjv*b0g8gc,et5r 8vhy1q t) e 50 m on the ice beforeeve8t je,5)0t 1sg*r8g h5 c2boqhnyv it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation 8j3*b thx5grr 0ic wf/pg/eo+of a traffic accident, police find 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 the prevailing conditions. Estimate the speed of the car when the brakes wp ebxf0 h+r3oiwj5c/r*/g8 tgere applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betweme9* ui7 b0v3+nbs qb+)iy69n cx teyvj98axqen the more massive box and the horizontn yiu9*08ie b7x +b+abmcsnj693q)ve9t qyvxal 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 less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface 9)d nc: bp9mgd* e p1*oxj;mmxctqz29 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 coefficient of s;ddm: xotq2 pe* 91gnpjc9*mczm9)xbtatic friction between the boxes?

  An object is on a frictionless inclined planeqe+t u3 )zw.yeaf;5caz vs4c4. The plane is inclined at an angle of tczzu w).c+aayv ;qeef34 s45$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a4udkidu,b66ti , to;i flat 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 8asw6 yu*)bcuv5 vs0ga smooth inclined 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 an anglyzx ra+p5 na5 g0(mq0ax9p2w le 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 conbrf ; z c;0akp:i0(ae3ykg5s sstant velocity of 6.0 m/ki;sse5 :030ckgbar p(f;az y s.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a maszix j1 1a9q d7;cx8bjys 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 slides down a rou nkk4x*mcxo :1:i2ne pgh $37^{\circ}$ 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 surface. The cable attacfmt+z.+h2w r 0 h7wbzshed to the log makes an ang hw 2fmwb+zz0.h7s+rtle 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 incfr)9hsuz hjl:n px..2lined plane tilted at an angle .fp.jh sul h2zrx:n 9)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 of incline is gradually g3t/. h pboxb1.h62ydq) oagaom)h -wincreased until the object begins to slide. The angle at which this b.o )2bh. h 3o y6oh1 tgmqx/padw)ga-occurs is q. What is the coefficient of static friction between the object and the plane?