Which of Newton's laws best explains why motorists shhg+4- +ugmvczyfb8z5 ould buckle-up?

  When you sit on a chair, the resultaw,4 d z h40zs at2gc)m+pvy:zont force on you is

  In the absence of an external force, a moving 6- -rih,-5zfihdz igbobject will

  When the rocket engines on the starshjch(h2cs wm8 7ip NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, tj2sc 8hhw mc7(he starship will

  A rocket moves through emp/ r,(wf8;t jkmm,py + nbtoc2tty space in a straight line with constant speed. It is far from the gravi2twok,n f +p cjm(/8rytm,;bttational 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 moving bus, facing forward, and j;lr:16w v pkfyou suddenly fall forward. You can imply from this that the bf:pj 6lr;k 1wvus's

  You are standing in a moving bus, facing forwa jw-a+jtv4pv gi8 sr86rd, and you suddenly fall forward as the bus c 6ig4 vpjrw8 svt-8ja+omes to an immediate stop. What force caused you to fall forward?

  A constant net force acts 84d82w d 4ahqdkx- ow b.uuhf gx;.s(sowl9f)on an object. Describe the motion of the object.

  The acceleration of an object is inversely proportionalf xysn -g*ax7; to

  A net force F accelerates a mass m with an acceleration a. If the same nec ncsz3u/n aa92 whq:;t force is applied to mass 2m, then the acceleration wwhu:a2c9n qsac;z n /3ill be

  A net force F acts on a mass m and produ-tbwa 74xm ro.q.zx1qces an acceleration a. What acceleration rrm wxbzq-4 1x. .7tqaoesults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the bah d5bybqmquo0f *6 /2adct75plloon will fly away. This is an illustratitf0 p m5byahqq2u5dc/ * 6b7doon of

  Two cars collide heap8b9b-7mg ;jhyhvg 0ud-on. At every moment during the collision, the magnitude of the force the first car exerts on the v9;7 b jhhu0y8mpgb-gsecond 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 force which th whj -8vt e55m4mu,oiqe object exerts on you wihm 5q4-8m ,vw5utoj eill

  Action-reaction forc)kkasg b l4(l)gv .o/des

  Action-reaction forces u*.mq4bj9 6xvm (d qxq)o2c fuoei.8i are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage 0m c(f;/ izq n-(xhaulto the car. Since a lot of damage is donez/ q;xc(fm (ua-l hni0 on the car

  An object of mass m sits on a flat table. The Earth pulls on this objectd x-5a7na6ner r*ks4z with force mg, which we will cal*4krsz5nd 6aa7re- xnl the action force. What is the reaction force?

  A child's toy is suspended from th b9, ..dituhd4e8ul mwe ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "actd.e.iw u ,49mlu dt8bhion force," what is the "reaction force"?

  Your bat hits the ball pitched to you wit9i,xp n 4:yl4dbvgc w5h a 1500-N instantaneous force. The ball hits the bat with an instantane9p clg4iydw,n:x54bv ous force, whose magnitude is

State Newton's three lfuo wadoc60axbgq xg;4x:68 (aws.

  Mass and weight

  The acceleration due to gravity is lower on th8f(7db9 i a crvgkj2k1e Moon than on Earth. Which of the following is true about the mass and weight of an 981c7jgrd2k vbai(k f astronaut on the Moon's surface, compared to Earth?

  An example of a force which ac7o5,, n0e y6dmpxr6h a:cpgmvts at a distance is

  Who has a greater weight to l4eh/d kz0cn, mass ratio, a person weighing 400 N or a person weighing 6,0leh4d kzcn/00 N?

  A stone is thrown straight up. At the top of its path, the net force acting e 0lxp j2;i2zj 0b;dhpon it 20j;;zil 2ebxpp 0dhjis

  A 20-N weight and a 5.p qyo-bvdmlu:vv 4z),9wc h310-N weight are dropped simultaneously from the same height. Ignore air resistance. Compare their accelerations. h1:d3c yop bl,)q4-z9mwvvu v

  A brick and a feather fall to 0vtud6p m 7/c;m4zcin the earth at their respective terminal velocities. Which object experiepc0zcmm647uvdn i t/;nces the greater force of air friction?

  An object of mass m is hanging by a stktac+*/j suv)f, ujk:ring from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in cu,ak +vj: /f)tsk*ujthe string?

  An object of mass m is hanging by a string from the ceilinp;:uclvq nr3l8- w mx5r5, *sfjxr 5qag of an elevator. The elevator is moving upward, but slowv3p :, 8rl*xj5u-amw nc; srfx5l5rqqing down. What is the tension in the string?

  The force that keeps you from slidi, vuoa3v/)i epng on an icy sidewalk is

  It's more difficult to start moving a heavy carton fro;,esck: g a0xpm rest than it is to keep pushing it with constant velocg:ckpe;0sa x,ity, because

  A horizontal force accelerates a box from reap-l.8zihcv .st 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 doubled. p.c8-z h.v ialWhat happens to the box's acceleration?

  A packing crate slides down an inclt-k2ug1z6xuu(ll g p6ined ramp at constant velocity. Thus we can ded6x(zt1lgpuluk g-6u 2 uce that

  A block of mass M slides down a frictiq kr5ep)14;g2 j5cz(idu fqohf 5s/cgc9wc/ monless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the5fwospcqfj4i1)cm/;52q9g /gc z5rkc ( ue dh plane on the block is

  A block of mass M slides down a frictionl+g g0dw3 s2dobtn:dy 1yv7of1ess plane inclined at an angle q with the horizontal. The normal reaction for3ds+dtf:y1g go1d207y o wv bnce exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclinednk) z)pdsagk ai0 fjp9iky w9z01-n(pojc + 06 at an angle q with the horizontal. The gravitational force is d9z0j pn-1pw9azio0(gf )n 6p kidk0y sk) jac+irected

  Two toy cars (16 kg and 2.0 kg) are released sii+/ztyoq -u 5ax5g (s2v1l.g j:etx oamultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which bal gg:+2/jis x (e -5u1vxyqa5.ttozo est describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appqepo .,zflw 0)lied to the object, and it acel)z .p0 ,qfowcelerates 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. What v.l lirnyetf-s,aa* o/ n*qdoi,5 (u* is the average fnq **tvd(le oafii /s.oal, -uy5nr *,orward force on the car?

  Starting from rest, a 4.0-kg body reaches a speelm4bcng p1(,r d of 8.0 m/s in 2.0 s. What is the net4bpcg(l,n m1r force acting on the body?

  An antitank weapon f 1zoy3/ - u3xa5jtn*sllm. pfjtbya87ires a 3.00-kg rocket which acquires a speed of 50.0 m/s after traveat*fypomzy bus7 5 jj 31-l3 /.xn8latling
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 from rf:oi0k+pw 3uwest, o30iwkw+p fu:

  What is the mass of a pers*m)bpx *rym0 von who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth whel5(zssnewh9l -p 3 ;5okx9sbtz9ttm/re the accelert-(mz9wx; t5t5lsb enko s9zp 39 hsl/ation due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass7l 8gfnj;s zojduyto:7le)w u/; ouy0b284 zj of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on thj 7ze4zujj:g7 ly8ounult0o8o b/y fd)w ;;s2e Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Mb (: myvbbov :jm9c7b1oon's gravity is oneobv vm9(1c7b mjb::by 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 .yh-mle 59ogr 5.0-kg ropo.9hrl -5ymg ee. Sue 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 avzm /9axo ,q4c2gh 0m(4+i fyyxsec :l level frictionless surface. A force F acts on the stack, and it acc 9h+:(oy/ixz a44ysvfcqm,x 2 m gle0celerates 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 the hmg2 8zmoyp5(c 29+ d;vlqkqp scale be reading when the elevator is acceleratingvk8lmzh2+mocpqd 95gqp 2 (;y downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If tl. arm:c82y) wr(l*s fdk 2eyvhe mass of the person is 60.0 kg and the elevator accelerates downw8v2ck. emr(r d)*:y2sfl awy lard with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ricjnb y q:wem,e 2jaw2d rsj50-m u-+q5t7rmh.des in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward mm2yja -ns je0e5rqwwmq5: dt, .-bur7hj c+2with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mas ybjp* 5r7msr)s. One force has a magnitude of 8.0 N and is dirsp jbm* ry)57rected due north. The second force 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 p* xg5fdiz+khxq pnxv1+k4l9c x: 1x +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/sklv9xi4cpqdzx+ +f xn 1pg*xh5x:1k+, what is the minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests onx (kx0i8.0 z m1mryrmm the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force zmkmm. ri 018ryx(xm0 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 = 0.60 kg and m = 0.40s. 18z;vesuv)3)qqj2czke jb kg, what is the magnitu 2sj cjqeb;).vu3ve18 )kzqszde of the 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 kg3 ;d9bmbhwv 5pi; de0j and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pudjv ;hw;5 b0im9ed3pblley.)

  A student pulls a box of books on a smooth horizontal floor with a force of ienum - +vjbym5ev xyon6/).7 k:e ap.100 N in a direction756ij/me-e)xuyankm evovp+. y b:n . 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 floor with l i7ypy; ed.1feio vja)x4,*ua 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 force on the box y v4 1p.*o )fe7jed;iyu,xail?

  A traffic light of weight 100 N is supported by two ropesnw-)k; 9tuy*wmta 7 *m6c wty0qghty9 as shown in Fig. 4-2. Whatmy;cu 9 qt*tnkm0ww* yw79hyt6a-g )t are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 kv,5tkl+ a;91y l b5nnedlyp-N, what is the mass of the traffic lighp5t bkd51- k;,9lyenaln l+vy t?

  Two boxes of masses m and 2m ar (r:9 8hb+zr0lz 5pucil zc+f bbnx:t*e in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the accelerar*rzcl 8:fbi +z(l+9bz n x bhp5t0cu:tion of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frijsn38,mxz/v(pr ,wq qctionless surface. (S xq,z ,rpm(38wsj/qnvee Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m a 8nzflobdn65 cz3(c ,0s3kur cygp9 8oqdqe3)re connected by a rope. (See Fig. 4-4.) If the forward force on the mon c p0oc o(sd)qe 6z3k5bd3n3fuc8,ryz98qgl re massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m gm 8uvp2kx)6hf ruyqvjynk;*r4 j 5+2and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what iyxm u+ p5vnj)qr46u jk8f;rh 2yv *kg2s the acceleration of the less massive box?

Two boxes are connected by a cord run20uj ;l4nphjsob/ ur6ning over a pulley as shown in Fig. 4-5. Boxojlbsj4u 0r p;/h62 un 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 frictions between a 3.0-kg box and a desk o xlt165u8wvpn t me(0mw 63ebare 0.40 and 0.30, respectively. What is the net force on the box when a 15 Nx nplb5w8tm(ee16uot 6w 3vm 0 horizontal force is applied to the box?

  The coefficients of static and kinu:ggr : az8:agetic frictions for plastic on wood are 0.50 and 0.4a u:g8:ra:zgg0,
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 direct2u av4 pd7,ua-olgjo 5ion. It slows and comes to a stop 2lu7adu ,pj4 g- aovo5with 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. A 3.v rdpuc ,f9n.w:y ay./1 yllw40-N friction force retards the motid v yw1f9.u:nl4 .yrcwlp/y a,on. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mask j24 ;r .apx)dz1lepss, 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 y 9:(e/ikrz8 ax):hp)nmd4bvvxq8l m initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficien )lvbvkneh8y4m:qmd/)(ax p :r8i 9xzt of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skied(c( ;uygn o3+;tk 9e:rm y2syf;igys hr(o;d marks 90.0 m long. They determine the coefficient of frictir;;m(+yd9:u(yos(cg3rey k;g 2 n iyo;fshteon 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 stacq5: rxzuqj4 m9ked. (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 friction force on the le qu 95xrqmz4:jss massive box?

  Two boxes of masses m and 3m are stacke84:tamrbi s ,yd. (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 :4bsa iy,8rtm is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclil r15, 4+hvtb dvgj(jined at an angle o 4(j +ibj lt,dvvg51hrf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a fl2 yojme2sej t1l8w 7d)at 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 inclined plane wir.roan r tubvdk z6ht45p7 37:th 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 smoothomh+r /ef+ i(hjk y6:-dl/j zt inclined 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 directly down an i-u, wi*euv h(kx/2izjjcxz/ z1hi b)5 nclined plane, at a constant velocity of 6.0 m/ 1 ex*h/kvc,j-bzi ju2(h )iiuw5xzz/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 slides9kvpe laqg 69rvmyyh95u( 5b4 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 rougd*/2 qkrq,u gsnn8 e/hh $37^{\circ}$ 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. Tt*: 3rqy-;.j qdydto k-c .pya5yt1kshe cable attached to the log md*y-.r5a yq k ko-typjydcq 3s;tt1:.akes 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 fromk) ls5az ob,gw -wv-.t rest on a rough inclined plane tilted at an angle o-5abgwt- k. ls) ,wvozf $33.5^{\circ}$ 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 intn2 u3,chx(tu 5xext0 clined plane. 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 static friction be,xuetn5u0t xht c3 x2(tween the object and the plane?