Which of Newton's laws best exph0 b,bq08vl wcg,un55z5ci 2(qbsjzhlains why motorists should buckle-up?

  When you sit on a chair, the resultant force on you ivspsc2v6 pip87 o8/bts

  In the absence of an external force -v(n+gxq:m xe:+ qrzx1jv y;e, a moving object will

  When the rocket engine4,g o4qnwcq31h+abghs fn *:r s on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in emwhnh gg+cf: n4r1q3s q*a,4bopty space, the starship will

  A rocket moves through empty space in a straight line with coywidimr 9+n 353w4ciknstant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be appliedy49 ci3ik 5n3mridw+w to the rocket in order to sustain its motion is

  You are standing in a movuhc 5r7cml a,-ing bus, facing forward, and you suddenly fall forward. You can imply from this that the bus's-ac,7 mcu5rlh

  You are standing in a movi57fma n- *j 7+zcsdnfhmjy**qng bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force causedf5*c-ma*qz7yn7hjn *j df+ ms you to fall forward?

  A constant net force acts on an object. Describe the motio8 ig.lru,n q:kgqgl0*n of the object.

  The acceleration of an object is inversely propuu) xz;qptc hxdg9i/s/kgn7 7 :/2fxeortional to

  A net force F accelerates a mass m auqx:r )d*3qwk93tdi with an acceleration a. If the same net force is applied to maq u3 tq*9)dadk3ix wr:ss 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acceleratiw0ydknyvwggd uk x zl /k32*087qp1n 9on results if a kxn l1 *vk zq 83y2uydnd07gwwg/9k p0net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the bb6)g;( eic)ds ok ai(zalloon will fly away. This is an illie(o)b a6(kgdsz ci;)ustration of

  Two cars collide head-on. At everp.pa 5vqizf-e0- wh/ cy 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 q .eafp5v /ch-iw0pz-on the first. This is an example of

  If you exert a force F on an object5w0 xlywr.n) x, the force which the object exerts on you wilx. ww rn5l)0xyl

  Action-reaction forcesy:q nshs23yo,kn fi67

  Action-reaction forces m xc n9;+njnrms9p9v vb:z t*9z,whb) are

  A 20-ton truck collides with a 1500-lb car1t)xq9 5pmh uh and causes a lot of damage to the car. Sinxthqph 591um)ce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object wit qlikv 59hb8/9onuax5 h force mg, which we willh9qx u5a/obl8 5ikvn9 call the action force. What is the reaction force?

  A child's toy is suspended from the cen5 d0q6vv.dzona*ug 3iling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. *0v6a5v ou dngn.z3dq If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. Tl9+fo,ykv . fbhe ball hits the bat with an instantaneous fo9+l.,f vkb ofyrce, whose magnitude is

State Newton's three omm0s ,* fgvk-a yuc3 uil3lq7u(l;e-se6bm+ laws.

  Mass and weight

  The acceleration due to gravity is lower on tj5(xm 3b d o(sn 2( x60s;/mvlckrz,jh5 gmrpyhe Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon'slgn c d ;6yrk0r,jxjh/ p (35m v(ss25o(mxzmb surface, compared to Earth?

  An example of a force which acts at a distance ist3g*g 6)pz/+p uelczp

  Who has a greater weight to mass ratio, a person weighinofeg 9 +/lg2wznkt+(vg 400 N or a person weighing 60wg9g+2tkfv/+n (lzoe 0 N?

  A stone is thrown straight up. At thehbp9r w9-+al;7rna pd ;sd.mh top of its path, the net force acting on it a +;rprs ph 9b-d.a;wlhnd9m7 is

  A 20-N weight and a 5.0-N weight ar,wxj69z c )k ( +qzmqfu6if6rge dropped simultaneously from the same height. Ignore air resistance.+c jwmzg,ffxz9rku6qq6 i( )6 Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal vo5*cmd qznl -cqki6;4elocities. Which object expern-c;c dlzm5qo*k q 64iiences the greater force of air friction?

  An object of mass m is hanging by a string from theu:uxx x.+qyl2 jc2 ov3 ceiling of an elevator. The elevator is moving up at constant speed. What ixqyj +lxu o2 v2u.cx:3s the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an bjzz )l ;xu bgms6.04.ygllr5elevator. The elevator is moving upward, but slowing down. lls y0jbglg 4u) b. mzrx6z5.;What is the tension in the string?

  The force that keeps you from sliding on an icy s8vie-pxtm7k8yce-bs(*lp 8x*7j ckw idewalk is

  It's more difficult to start moving a heavy carton from rwxvv6h z-x1rily01 3fest than it is to keep pushing it withrwi3vh06vyx1 f1z lx- constant velocity, because

  A horizontal force accelerates a box from rest akqbw h.d*,n+6ir2 55kji izytcross 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. What happens to the box's acceler 5n.tkr wib,k6 yhjdi*5 zq+2iation?

  A packing crate slides down an inclined ramp at constant velocity. Thus we can fs, /ctmily+d :,mad:rus4,o dedudco, trfu:/msd:l m+4,ai,sy ce that

  A block of mass M slides down a frictionless plane inclined ama5j0*) f 8p )ewk(ki8 ajxcnzt an angle q with the horizontal. The normal reaction force exerted by the plane on th8wan 0 *xjekzif)c)p (km58 jae block is

  A block of mass M slides down a frictionless plane incerv4: t (4ivpulined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block 4:vter(ui 4 pvis directed

  A block of mass M slides down a frictionles3m )6qti n/rq06/fxmqt wr)bys plane inclined at an angle q with the horizontal. The gravitational n)3/r/ wiqt t f0qm66)xmry bqforce is directed

  Two toy cars (16 kg and 2.0 kg) are released simulta9,j vpp:c 0 ,ot n8gu:b9skjeineously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement whiv :bnp9kg, sj,i jt epocu:098ch best describes their acceleration after being released.

  An object sits on a frictionless suel*0*uzhmoo5 rface. A 16-N force is applied to the object, and ithue*m lz0*oo5 accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accel ;;*ywn; ihzw5vtjca 6erate from rest to 27 m/s in 7.0 s. What is the average forward force on thwvw anzh c*iyj6t 5;;;e car?

  Starting from rest, a 4.0-kg body reaches a speed ofsw/i:v + kwfh7n .ryg; 8.0 m/s in 2.0 s. What is the net force acting on the bodwfhrs+:n7v . wyg i/;ky?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50bto24q 8pn) gv.0 m/s after 2v8q bn4o)tp gtraveling
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 fork/qlge 2: 1azwce that you push a 10-kg mass from rest,a:ewl kgq1z/2

  What is the mass of a pu9j45o yiq,w,z;*g-dqsd *0crurnk ierson who weighs 110 lb?

  What is the mass of an object that weighs 250 N on thes 4r geonomq1 -7wa9 8+zl llpmfz/))e surface of the Earth where t)l9slo7w f n+qzzmlr 18o- pag)/e4mehe acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Eyr mhz*1ec+w 7arth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity isrehc1 +w*y7z m only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs j2h jlg 8qt1-j40 N on the Moon. The Moon's gravijgq2t jh-j81l ty is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war b0k0 zn* blt o5,so-epfy pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What iz0o5koefp*t0lnb , -ss Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts dl d syr7(v8(eha))goon the stack, and it accelerateg8(d7)hov )(rdyla ses 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 e5 h1t*7-ncd. vfz9 fxrmaukq+ levator. What will the scale be reading when the elevator is acceler-rkf txuf 5+9nd.1m zc7qv ah*ating downward at $4.00 \; m/s^2$?

  A person on a scale rides in a n7by7 lhpmw1iiq0v w2-rut+( n elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceler1 uq2(wim7 brphl 7v0i+t-wnyation of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If t3xs 2w;h cegirtp 0*1/0scxauhe mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration o*ps0axr1w2/ g xc3the i;0 csuf $4.90 \; m/s^2$, 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 r p el1mld 8*fvtm;385-rsj aqN and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of mqr ;p1lj-rd8l3sf8t5e m* vathe mass?

  An object of mass 6000 kg rests on the fln-6u chrj2g t;wg lqim0bg(,zmxb96vw i+ .1batbed of a truck. It is held in place by metal br iv1w-0rb2hbl, b.quxmj669( ci wz +ngt;gmgackets 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 slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in -djkbk6m al1vf u.a-* 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 time if the load is not to d. -l6kbkjav*1uf ma- slide forward into the cab?

  In the Atwood machine shown in l gasa(gf/by. 9:y 6pb jt-0rsFig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction sj-a:pb6 by( y.gtgs0rf/ al9and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M =g y .lt.yvx*q+ 9uqqc7 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass ofy *.7qu l9yqqcvxt .+g the pulley.)

  A student pulls a box of books on;,r2*ym jt-xz((nvee ; mgos0 q8ql vl a smooth horizontal floor with a force of 100 N in a directiont r8qgv mje ,o;s0exn;(lqylzv( m *2- 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 stt9/ufwb4 m6 /j6s jtvmooth horizontal floor with a force of 100 N in a direction of 37.0e above the horiz/ 6tstbjmtwv94j6 f/u ontal. 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 shown in Fi7:-bue- gvd5hg pmam; g. 4-2. Whuhga- vmbg:;d75 emp-at are the tensions in the ropes?

  In Fig. 4-2, if the te0(w2jf 9petgz9rl xt0p j w z;dq42+c7d fov0ansions in the ropes are 50 N, what is the mass of the traffic lightjv 9wo zl t20dxg r40zfdct0e7pp;(aq+92 f jw?

  Two boxes of masses m and 2m are in contact with each other on a frictio/ew7hb-vezi2v mu *3a uyeg2; nless surface. (See Fig. 4-3.) What is the acceleration of the more masi ;2w*3bmv/e guyv27 zh eau-esive box?

  Two boxes of masses m and 2m are in contact wiuyc54ea 4 k5 e,+nly1qcl;g tfth each other on a frictionless surface. (See Fig. 4-3.) Wh y4k;eg5uf1 tqc5l cl e,4ya+nat is the net force on the more massive box?

  Two boxes of masses m and 2m are connectl6t29 ) dxc1ke6-kipui, el gped by a rope. (See Fig. 4-4.) If the forward force on the moree-tck,il)g1pl6 u96xe i2pkd massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are conte8 ubi7 6dv6wnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of tht76ide v bu68we less massive box?

Two boxes are connected by a c.o q+u/oo/yaxca6u /u ord running over a pulley as shown in Fig. 4-5. Box I of /o+a xo .6uu uq//yoacmass
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 by)+9f nbl2 kxv2y ijj+etween a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the ny9x2v+lj ifky)j2 b+net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic fricti j q4dp9q e; h1lwa7vp279xb;uyks)wbons for plastic on wood are 0.50 and 0.40,kvsj29pqplhe xqu7 )w4d9;y7bw1;b a
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 tve ha39 ;9nomxkn w 1a:/-ehtrhe +x direction. It slows and comes to a stop with a9n/-raoa;tw mx:1 kh vhee9n3 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 pu+bo1o gp+6zdvav78,oc+ wmwo lled by a 5.0-N force. A 3.0-N friction , o++go1 o c8dwap w6vomv+z7bforce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass,xy81yg4+b5s2yc hjtd 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 ds rmv2m84/uw puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it st/8uwd4 sm2vrmops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks thq8h.5skj-x , cm:cq+j sy 6w0)vz o*bqj bn)90.0 m long. j) s sqc -0y.kvo bxq)j:68 hm+btwz*jhqc,n5 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 applied.

  Two boxes of masses m and 3m are staok: n;c+ xfcsn6 wea+9cked. (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 mas; n+fw no+c x69k:asecsive box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are staid11zyx/dunt -t + s+jcked. (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 thetxt / nz1++dy sjd1i-u more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclinedui,rm(nx xaj4fk)la(,i9nn x kna3u.f v+ )n 2 plane. The plane is inclined at an angl,l.4xa rank f jvu(n,+i)knminfx a)xu (293ne of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill -nbvrrgrbrlv+ -om5e6)1 i f q3:uz*dthat 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 smooh/p nmt0 *rmn mi)b3w)th 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 incline8 )arcasg;1b,i cc:hz-ghs b q;yh h65d 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 di(l q)kf/j6wp m 1ay.iy j(ld)krectly down an inclined plane, at a constant velocity of 6.0 m/skw()jj 6a( di/)y 1fy.mllk qp.
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 roughzt i.uk97j d3k $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m zoff80*zf6v a+fg3 zk slides 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 weighk v/3btxj 0g;r-2;un 8w p5hpssl:nr king 500 N along a rough surface. The cable attached to the lbk;/jg:8whlp5x;rr ks3s n nut-p v02 og 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 rej6k qe(k+kr q0c +ie9fst on a rough inclined plane tilted at an angle of6i+e+0(k krq9 cejqk f $33.5^{\circ}$ 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.:ps0+psbcxe,rt 2 de 9 The angle of incline is gradually increp9p 2dtsecb+x:ers 0, ased until 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?