Which of Newton's la2v t rl.0curpy2x ;zx8,k gqs1sv/n6ews best explains why motorists should buckle-up?

  When you sit on a chai*bh ofpm/m-t2 8uqji4ut (z1er, the resultant force on you is

  In the absence of an external force, a movt uhw:flai1q0(* 3 ;otfhj u,ding object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turn4bogyi ):bcp 50m7 pxved off, while traveling in empty spacc0gm4:)bviy xo 57b ppe, the starship will

  A rocket moves through empty space in a straight line with constantnl9/ rd 7*p k:x97rfm matl46yv+yvun speed. It is far from the gravitational effect of any star or planet. Under these conditvk mux:4v dtr nly9 7+/manrf9l p76y*ions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a m9+cphvn sn(cnxmk23 y *x48h xr;tcp*oving bus, facing forward, and you suddenly fall forward. You can imply from thismr*8x;ncsh 2+*n cp94 nkyvt3cx pxh( that the bus's

  You are standing in a movii y 5uj; a9rd4btxy1kpotmiq/ /246dbng bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stopx6po j/ktqdbdtyr/ y4;45ia 9um bi12. What force caused you to fall forward?

  A constant net force acts on an object. Des0j2g 0jdn* yhda9l ,eycribe the motion of the object.

  The acceleration of an object is ivna c-uq ey/k h8ac8-1nversely proportional to

  A net force F accelerates a mass m with an acceleration aark9fu+) f9logk t 8 -(qqwbm/. If the same net force is appl+9 qoq8(u )/tmf-f kbgrwl9 kaied to mass 2m, then the acceleration will be

  A net force F acts on4r/b* wcm8v0px4wj xs a mass m and produces an acceleration a. What acceleration results if a net force 2F acts on mass *jm w0 sx8vbc4 wpr/x44m?

  If you blow up a balloon, and then release it, the balloonv)y3sg,px6 * ox n;nf8hxu p:gj.qzu3 will fly away. This is an illustration uxoqxggh8s j , nuppfnzyv3:x);3 .6*of

  Two cars collide head-oijc;- l5ifz9 xn. At every 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 on the first. This is an examplel9x;5cz fij-i of

  If you exert a force F on an object, the force which the object exerts on-z 0gsicm 2z*td9) uy 7bdvp2v you willc*vs) m dz 0ti-yb72gpu2dv 9z

  Action-reaction force, jnhd 0s+wd.0z zi5vm0n2h+a 9rjjyj;q5t urs

  Action-reaction forces arq(qzwze29 qs5 r- kw+re

  A 20-ton truck collides with a 1500-lb car and causes a 1m .t5w r; l hhkh9fbclk/+bo:lot of damage to the car. Since a lot oh;51 ockbm9lt.hb:fh k+lw/r f damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on thi4 r;bkxvcl 4 o3q+lp 9zrna cw+t,w*x/s object with force mg, which we will call the action force. What is the reap+xzvx ;wl4k 3* nrbc/+4c lowq,9rtaction force?

  A child's toy is suspsy1c+*j z.fw)zc2 jh aended from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. h2 zcjy *wsjfa.+z)1c 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. The bax,io43cxno f +ll hits the bat with an instantaneous force, whose magn3, ifnoo 4xx+citude is

State Newton's three l4mgw)6phoisl c.7n 1 uaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moonzy16cefg; kg , than on Earth. Which of the following is true about the mass and we1fgy zk,g c6;eight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dist;fmnon9i3/. aae)t* z2 bgcmbdc7t3 kance is

  Who has a greater weight to mass ratio, jc ih/l7iz),e moj./)*y o( jh;co rmda person weighing 400 N or a person weighing 60hcrjoz*;7 y hilm(c)jo,miej). //od 0 N?

  A stone is thrown straight up. At the top of its path, the:uji ,4 ana0rs net force acting on it i, ansar4:ji u0s

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the safzbp/95vgz r 9/dd8 rqme height. Ignore air resistance. Compare their/dzrfrzdbq g5 /9v9p8 accelerations.

  A brick and a feather fall to the earth at their respective yqz/7gvbk)emmh 43q9terminal velocities. Which object ey9b7e h34/ mv)qgkzq mxperiences the greater force of air friction?

  An object of mass m is hanging by a strin: qov zziq0+j:g from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the strinz vq+:oq j:z0ig?

  An object of mass m is hanging by a string from theoza* euf(w. .wmq7q)g ceiling of an elevator. The elevator is moving upward, but slowing down. What is t(owf.q7we.agu*)zqm he tension in the string?

  The force that keeps a*nkri x5zer(g -b:vo5 *gc6)xa4:bd 3mk b acyou from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton fro2/vc1y ,f jse5xii tq l:*bxz7m rest than it is to keep pci yx:z* jqxs/e 2l 1,itvf7b5ushing it with constant velocity, because

  A horizontal force acceleratesc*+ebja3re v e:sp .e( a box from rest across a horizontal surface (frictionrea (e+ e:3cj.b pevs* 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 acceleration?

  A packing crate slides down an inclined ramp at constanpc1iu fib+r 34t velocity. Thus we can deduce t 134c+rpfiiu bhat

  A block of mass M slip-)btxjy y 1 m8gy spcq*i:l- 5mm2uye8t8t(g des down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the:p mygl g25meq*)-8tyi musx-btyp 18tcjy(8 block is

  A block of mass M slides down a frictionless plane inclined at an angle q withm:/t3 z1jrrvh 3vs )*iqblq,a the horizontal. The normal reaction force exerted by the plane on the block is direcbv3:qmjaz *hv /1rs3rlit ,) qted

  A block of mass M slides down a frictionless plane inclined at an angt1r7tzug:za*6wfow/ aaylvpv ln669-ig9 ) nle q with the horizontal. The gravitational fo zwtg-nlvpina/v1w o 9l ga7f6ya *:r96z6) utrce is directed

  Two toy cars (16 kg and 2.0 kg) are relel mpxu:v*0w h)c ;8k2txhp n3pased simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best h3 k *:0)w;lvm8pph xutn2cxpdescribes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied hvc/p 41 yef2exmd3ci ubjv:- 4:gzi3; ffh i3to the object, and it accelerates g1 3vid 4 xe-ci;h3/e f:hjypzbf24umc:f3iv 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 75a9.ytp64+ ,tkgfavz3er lzws m wa8..0 s. What is tf.9k ,waat53 zsp t6v4l gr8maey z+.whe average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8./tl7u nca wc.*0 m/s in 2.0 s. What is the net force acting on thw 7ncc*tua l./e body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed ofzf .ste+/n lc7bhtb,j+w 9l5 d 50.0 m/s aft .75n,l9je +btw+z dtlshbcf /er 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 maj9eeeh7l saoe8.v4c1m 9cnb 6ss with the same force that you push a 10-kg mass from re49ceh8mv eoa. 9l nbeesc16 7jst,

  What is the mass of a person who weighs 110 lb b5au:eajaynz1z;, ;u ?

  What is the mass of an object that weighs 250 N on the surface of thy aba-5os t8 8abe/h7te Earth where-sh7aao/ tyae b8 tb85 the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What mn.u woz) pt(ivn.n(-b1ij . ris the mass of the object on the surface of tipn)-n(zu .t1vi (rb.wn. jmohe Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N og44 *ufdkxze 2:qzv m 89hjd/tn the Moon. The Moon's gravity is one sixth of Earth's. Compare the matz*2gv4k9q:u jx/ddz e hf 84msses of the objects.

  Sue and Sean are having a tug-of-war by pu+ nawn d-o-vq;lling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force;own-d anq+v-. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on(dma*/* nrmo.8xe e axrok) f4 a level frictionless surface. A force F acts on the stack, and it rrm4x*f*8 e/deax)o n oa.km (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 will the sc.k2k)n a: u;t:hi vwrbale be reading when the elevator is ac:2a ;.untvb r)ikw:hkcelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass czi*5 cs)(l.qrltmg: g5i9p s of the person is 60.0 kg and the elevator accelerates downward with a*5gqp:lis9s zi 5tgcc .) lm(rn 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 massm q-7pq i+xt5.h tiwd* of the person is 60.0 kg and the elev-+mqp d .q5h*7x iittwator 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 magnitude of 8.0 ;uhz4b /tk/tg N and is directed due north. T;gtz/bk hu /4the 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 truck. It is held in pl m4a)vt udf:jcw64j4iace by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, whatcvuj44 6t4d)wa: mijf is the minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 k1src , /jpr0gag rests on 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, w / casp,jr1g0rhat 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 = 0.40 kg, what ishwiw, mg(1x8a 9/xfz v the magnitude of m8 vz9i,fw(/ x1hgxwathe 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 = 0.45 tsokz(wm8 wxm-q d+ga/xin f.8)+pd0 kg, what is the tension in the string? (Igsxn o ( 85-.d mqwt)kdf +wpai+xm8/zgnore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force o7jobad p7lt7z1ek:;2 8hv xyn(d 2yt om w35luf 100 N in a direction t7o5e kvbt layh1 ;oduzd jpwy23787(2xnlm :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 +ezrdcmd9 , 0 blo8ij0k wqpjtbr( *s(k)pz;2of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books i(8r 0z ,wk*t o qmrdb0;klzjc9j(i s+pd2bep) s 40.0 kg, what is the normal force on the box?

  A traffic light of weight 103dk9h7ufj11/lp: *sgzk af p h0 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the rofpsugk *7kh3hd19j:af z /1pl pes?

  In Fig. 4-2, if the tensions inb+ h9 5:5vxolqpoc, 0jia cvd5 the ropes are 50 N, what is the mass of the traffibv0 vq5cpo9ia5jx:, d+c 5holc light?

  Two boxes of masses m and 2m are in contact with each other on a fricfd+5) r le+bq)pt +wzbtionless surface. (Seb )rleb+)zptf +dq5w +e Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a friction i3*qgda te**t 6qwog2less surface. (See Fig. 4-3.) What is the net force on the more masat * dow*q6* g3tgq2iesive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4wp+t/8 -zq 1ov 1sf 8rmpoqp5n.) If the forward force on the more massive box is qp+wstr-58f qppn 1zo mvo18/ F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4+,fihx0 lezl4lup5k ;we 7p+r-4.) If the forward force on the more massive box47p;pu 0lrl++5kiz w , helxfe 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 Fig. 4-5.z, qgebar:3k8 Box I of mass :zrq3 ,bagke8
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 kineti- qr fs7b; qx)i+kitalhm 8k12c frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box w8m)bis h2f7xliqkq - ; 1kta+rhen a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on woodc/e ,eyh1d :na are 0.50 andch/ 1:,adene y 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 su8jzt5z + hfrf2rface in the +x direction. It slows and comes to a stop with a constant f z2htj fz8r5+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 3.0-Nw 7ej47,eekj u friction f7 eu ekj,j7e4worce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a4qzb w1u+yj9o 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 /g0mlebul(3hc(.cxw. n6 x yo/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction betweenhyw(lxb.e ug(6 3c0cl.xn m/o the puck and the ice?

  During the investigation of a traffic accident, po q/taz j2y6f-pgvr*/l lice 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 were apvg*j y/zraf -q/t pl62plied.

  Two boxes of masses m /. nga ir.3n5pjw tu2qand 3m are stacked. (See Fig. 4-6.) The surface between the more rq3 n2j5/tup ngw.a.i 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 less massive box?

  Two boxes of masses m and 3m arv+66vy() rvqpeqytv ;e 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 bo6 yyqr; ve+)t6qv(p vvx, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The planevj4j m5k7af4 eb;m. nuo5t7ds is inclined at an angle e5fm5v od77m 4.uaj ksbt4j;nof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dow0a /anfh) b0xtw7boa,n a 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 a smooth inclined plane wiv 8qfvfq6+l2 gi zhpi7o nftvi:/.(6tth 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 angle i.t64dee 5;jsc ush4nof $35^{\circ}$ 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 ad3ols; e6.c 0wkq3/jnqk ;e pvn inclined plane, at a constant velocity of 6kn lo3jsd;v3 /e w.6kqcq0p;e.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 siu ) auhhspvxrs o).+iik((:2lides 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 sl ij0pr/*tnq3j+aol; (j .nwzlides 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 50eia1yu6l-p0 ms0h pa (0 N along a rough surface. The cable attached to the log makes6 ayep0-s 0(mlpih1au 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 rest on a rough inclined plane tilted at an anglefku3rw+x 4z.m xmu+w3.fk zr4 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 b-zgj7lvr v8a yu+bd;g 2f x3:k+foo; an inclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is 2lbo+-j8 :v7f+xr;u3g;zkb ya vodgfthe coefficient of static friction between the object and the plane?