Which of Newton's laws best explains why motorists should buckl m:hx1ju7smpux)0i3ke-up?

  When you sit on a chair, the resultant force on 8w7u05m0omlr6eyt o+0 j uppayou is

  In the absence of an externw(lsx,g,2q 1rk *mur etn0 zh,al force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly nd .(x7u28bjl/efsfhturned off, while traveling in empty space, the starship will8u72 (/hsefdbnj lxf.

  A rocket moves through empty space in a straight line with constant speeglip6mlk iz9kv0-hx//u e5t(wk6.o qd. It is far from the gravitationw.oqki6 uxk el60klz mt-/ hgip/(v95al 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 mo9;bl5csar a5 gj3cy3xv ht7kv/1uyw; ving bus, facing forward, and you suddenly fall forward. You9s7k;vw1/3lc;ajbrvta5 g5cxhyy 3u can imply from this that the bus's

  You are standing in a moving bus, facing forwtjr4 b( ;/hj5 mvwzce)ard, and you suddenly fall forward as the bus comes to an immediatcbj;t45 hrez(wj) /mve stop. What force caused you to fall forward?

  A constant net force acts on an qk mq7xutd .3r(2ue q ug6tq57object. Describe the motion of the object.

  The acceleration of an object impqd d.q*)d; is inversely proportional to

  A net force F accelerates a mass m with an accel)r+lu:o gl,3 n;dm:tvfgy2e weration a. If the same net force is applied to mass 2m, then the acl2tg3y n:gevroumw,d:+ ;f l)celeration will be

  A net force F acts on a m57rm jo,1zau vsu 8fk:ass m and produces an acceleration a. What acceleration results if a net force 2F acts on mass1 7 jrf:su5 m8uko,avz 4m?

  If you blow up a balloon, and then release it, the balloon will fly away6+xof i f9hc(y. This is a+(fifoc96xhy n illustration of

  Two cars collide head-on. At every momenh1c8)l;ogq( efc u7qcqj8dmsfs2 vy)v,cj0 ) t during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the )syu)cq;q ds8f )o7 (,cl1j8h mq ev2g0 cfjvcforce the second car exerts on the first. This is an example of

  If you exert a force F on +ru *0o kdd:dyan object, the force which the object exerts on you wi*d urd+0k:o ydll

  Action-reaction forcesjjle- )vv9 cx eac3n5--5mh ok0,t-efyw4 nyi

  Action-reaction force np2frj.aw.o14org 1 ;s vi;lds are

  A 20-ton truck collides with a 1500-lb car anp5j7slb, ;6,fbss- muig/ib h d causes a lot of damage to the car. Sinh u/,,lbg;m6 fspij bi75s-sbce a lot of damage is done on the car

  An object of mass m sits on a flat table. The 3tce9 d )mz:gpdr y;l2Earth pulls on this object with force mmc r2zdg3t ;)p dly:9eg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceilinvcpeiv.85b(d2u m a3a r-vsi/ g by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is thvb sa-rdu328p/im5c(aeiv .v e "action force," what is the "reaction force"?

  Your bat hits the ball pitched to yokxf4 u,u (wko0u with a 1500-N instantaneous force. The ball hits the bat wit 0,kw4u(xkufo h an instantaneous force, whose magnitude is

State Newton's three lawkd(l):/,cdosyk0 cr 9 gw;pfms.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on /:xibhmfsb/o/ 3e 6kx Earth. Which of the following is true about the mass and weight of a /bmh:/3bx e6sik /fxon astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts a)wnog l- 5fvmy/t +in:t a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or txxaj1m) j t8 *9 u.neppf/pd2a person weighing 600 N?ppa./p9me2jft) x1nxtdj *u8

  A stone is thrown straight up. At the top of its path, 7*9dec dfpz,3j*7 q: yop lpny 2s9qxmthe net force acting on i p,9ofsp:yy9nx*me2 3dp zqcjq* 7 dl7t is

  A 20-N weight and a 5.0- .py3veto7 c5nN weight are dropped simultaneously from the same height. Ignore air resistance. Compare their . to7ne5c yp3vaccelerations.

  A brick and a feather fall to the earth at their reu;e zptqivo4x7c 7-d :o5c s3gspective terminal velocities. Which ob tcg:iqo veso4;zpxucd7- 5 37ject experiences the greater force of air friction?

  An object of mass m is hanging by a string fm0lto-1 gu4htqmx( tf+ks u 5*rom the ceiling of an elevator. The elevguu +htlm*k(ttq1sx om-f 054ator is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elco8s g uvd3 -oa1*cpe-evator. The elevator is mvgcacs u *o-1o-e d38poving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy siduqg1k 6cp(,ib54pf bsv0c cwlmv:ls6 ei-s4; ewalk is

  It's more difficult to start moving a heavy carton from rest than it is to keep,l, inegff6 gt )ifl6+ pushing it with constf) 6llii n,t gg+e6ff,ant velocity, because

  A horizontal force accelerates a box from rest rmuzg5schffuyf)t6*i .x qu/9lu)e:z 7u2)l 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 dg*9l 5uf)uzx26fl)t7euhu mq. :)izfry usc/oubled. What happens to the box's acceleration?

  A packing crate slides down an inclinjgj + +mk7j-p5kthn.ned ramp at constant velocity. Thus we can dej7nmk nkjgj-t.5 ph ++duce that

  A block of mass M slides down a frictionexqdg; 6h0 5cyltm(z y4mcv*,less plane inclined at an angle q with the horizontal. The;h*yx0vq5 ( zlc m,y4m6cgetd normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle(te .yozcu7*fohk 5p1 q with the horizontal. The normal reaction force exerted by the plane on the b*(1z oc7 ptfe5oyuh .klock is directed

  A block of mass M slides down a frict;p. souhomo;)2sbk9 eionless plane inclined at an angle q with the horizontal. The gravisu9e;).m;o 2b ho pskotational force is directed

  Two toy cars (16 kg and 2.0f0 98xpht6 ksj.j *zy0eul2qr kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statemen9ktl6 pz8jq.e02r*sxy 0jf uht which best describes their acceleration after being released.

  An object sits on a frictionler e jt5l:qh: s28i*mwpss surface. A 16-N force is applied to the object, and it accel2l :m 5wp:*hjtrse iq8erates 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. Wh)w p )xx*e.fasgr8pgl c3qk ..at is the average forwar xw qcs3gerk xg.)8). afp.p*ld force on the car?

  Starting from rest, /uvyrlv6- * hlg,dv oiz2;yzj jt:+(ua 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is 6d;* ulzu-j+yv ,ri(/ jv l 2vztoyhg:the net force acting on the body?

  An antitank weapon fires a 3.00-kg 82lrz p*kulo( rocket which acquires a speed of 50.0 m/s after tol*2ku8 zpl (rraveling
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 thfl3e n 6kgaph1(6;vu ye same force that you push a 10-kg mass from rey(v61p uhlk3g; nf6a est,

  What is the mass of a person w vrcm ;wjczi8ql )n 3w*7,h-ueh9zd3hho weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth whe/qs,+m dt 1sj:x:o a.ajbwz v-revsazm :/q:wdbja.j ,ost-1 x+ 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 ma qrk/c7tw 8q gw2 x0qzf4.oy1uh4e2n)kqm1srss of the object on the surface of the Moon where the acceleration due to graqm xs)ogzkq nyt44rq2 uw2ce. qf/ h7 w1kr180vity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Mo gt soi6(3g,.axpyr(w0f eb,hon. The Moon's gravity is one sixth of Ey(w 6tas0(po rhxg3,fegi. , barth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pullkzel-)-/x1c wuairr m4+ np8cing on opposite ends of a 5.0-kg rope. Sue pulls with a 15-ae 8w-x/4u crk-zm1) p nil+crN 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 frictionless : vnicf/c19w /*q/u7. , kyxevwqvwhnsurface. A force F acts on the s/u*wqcw:v.x9y, n1 w/ ef/7nicqvkvh tack, and it 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 w4v7h)uhf+ajpzmhico 2 jr* 46nv+y ( zill the scale be reading when the elevator is accelerati4vcj hhahuiyr+n ) 72vj4p m(zoz+*6fng downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 djig7.it+ a5)m 9 uggfkg and the el+ ). agj 9gf7uidmgi5tevator 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 the mass of the perso*b8p u(4fczd ,zpdhzp:p(x 1nd 3p-rdn is 60.0 kg and the elevator a:d(b-(dppf p48u*zxzz pp ,3dr1dch n ccelerates 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 mbopj6ln6*g-t mo;+ d kass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east hasgdomn *o +t; kj-66lbp a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 60d2.pp zmlohp t1d8ht n;kee9km/ 0yf49 wsx 9200 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exempmknpw8t/z 9t 2fh4d1l ds9 pk eoyh;.9xe02rt 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 slide forward into the cab?

  An object of mass 6000 kg rests oe jhutr5p r;-x-mrg2:n 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 traveling 15 m/s, what is the minimum stopping tir h: umt;r -erg-xj52pme if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what if-2.th0ztc/( r8te1egw ds;gsq ;ayqs the magnitude of the acceleration of the systemr;ez0c -(182qa /d;wst. q tghtyesfg? (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, r5gome286n;.kcd kyw what is the tension in the string? (Ignore frictionkek6gd. yr;28ncwo5m and the mass of the pulley.)

  A student pulls a box of boop3qp5zt d2es4iql8zr0 u (oz-ks on a smooth horizontal floor with a force of 100 N 3pzldspqu2o0i z 84(z5terq- 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 horiuw m/ :u3v k z0yq66zypl:ng/yzontal floor with a force of 100 N in a directionw6y6lu uzmkqv:n y/:/0zy3 pg of 37.0e above the horizontal. 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 100 N is supported by two ropes as she3+si xqrsw( cs;bj ;/own in Fig. 4-2. What are q rswxjc;i(+es3s; /b the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, w.)3nb921 . g8qob,lmt laq :ltyqxlwchat is the mass of the trafmn3l,qqa.)o 1cbtgbql9w2 x:l8.l ty fic light?

  Two boxes of masses m and 2m are in contact with each other on a frictionless a/smn*w(/ vda surface. (See Fig. 4-3.) What is the acceleration of the s(/ m/*anwavd more massive box?

  Two boxes of masses m 5 tfnna9 0ggp3and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What isg93 ngp5f0 nta the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See F:apn-4 w pot)0 iyg0 v64adyvzig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting o z:y46dv-ga 0npiw 0v4pa)ty rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) Ipm rx.nk-hf,2q7q b6wf the forward force on the more massive box is F, what is the acceleration of the less massivek2,f rxb7wm- qq6p hn. box?

Two boxes are connected by a cord runn5ya+xm4mxfv u8b/p9;g)bpju ing over a pulley as shown in Fig. 4-5. Bgy4mxxum9p+5pubf/b 8a;)vj ox I 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 kinetic fp ;1izyt: 8g6gk3nu0frh4q zgrictions 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 8un pr0:t61zkggf ighz;43yqN horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on woo b5; hwvf(fjlojqkiar5*1gpd; i 6 n4p w,op:9d are 0.50 anjid 5b*oqfr: ih;p,w jwof45a9 ln1 p6pk;(gv 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 +x direction. It slows and cot*8ywn y *2.fnz z0weomes to a stop fz 2.*ywyot*w n0nze8 with a constant 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.+ pfy/4*ino 28t h-rf q20i igj*scswt A 3.0-N friction force retards the motion. What is t iy+tqhsc8p0 wij f4gt*f-ns2 2*or/ihe acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from restusno5t);f 0 pq, 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 initi hgu8.kyil,0di7jzd4/w f rp3 al speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic frictio r, 0f. iuzjpgd8/7hydl3i4wkn between the puck and the ice?

  During the investigation of a traffic accident, police find so ( n7uw+iy0dvkid 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 were ai0w 7 (v+dynoupplied.

  Two boxes of masses m and 3cusyk*o n 8 0kuouf) tru7urk82//e1bm are stacked. (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 frictiou uyc/u )o8fk 1e/u r7snok0b2ru*kt8n force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) t*31k ; i4jagvuoscm gap..f0nbs p7a(10biiThe surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is kpj.; i(1b*abo umng0.ai37 1pfsvg0ca4i ts 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 p t ,c5t*8zt;yl*vkehrfdbawj2 v( tbl,1 an*6lane. The plane is inclined at an angle of j**wev*h5az blnb 6(k t1c ,vtar df 28y,ttl;$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill;fhyx92r naqbdkgd ,(w *9fp , 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 an 7 d3 alz1eg/* *hqe7lskhmkx,gle 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 t(4hoxihj 6hh1 wfaxq*5 dve6) ilted 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 constant velock7veod q)r i-i37pdiuvkl+ 5,ity of 6.0 qd5,vo 3p+-k 7ir)uvi 7liekdm/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 a zc8fj) fl36fpoq8 m;c 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 sl;whe 13 zgvn r5wqw2rl+ uk2t,ides 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 surface.cgwm8 f(xh )u:l9gv5g The cable attached to the log mak vl) w5cguf:h9(x 8ggmes 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 fro,d og 4g51ylx,a t)dvrm rest on a rough inclined plane tilted at an angle , vd5t4lgg do) rya,1xof $33.5^{\circ}$ 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. ix: b7. ctwf6a 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 static7 cifatw xb.:6 friction between the object and the plane?