Which of Newton's laws best explains why motorists shou e ,z1 wexm)*vox;3p+qg9q majld buckle-up?

  When you sit on a chair, the )r u+mgte08 t2 orlpt,resultant force on you is

  In the absence of an u58r+11qk xnx p9qtrhexternal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN a,vg/jz we1ia y/ydk5d9nie xw5 ;7h/vre suddenly turned off, y5iz v//evi kay17xjne5h gdd/9 w;,wwhile traveling in empty space, the starship will

  A rocket moves through empty spa/;4ym---aras0rrt hj mz5 xbf8u: jvjce in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in o8-uby5r 4r0 amvjjmzxajh-f s:-/;tr rder to sustain its motion is

  You are standing in a moving bus, facing f3:kqx93d- e4rxy kg tuorward, and you suddenly fall forward. You can imply from this that thekexk r9 43:xqy-d3t gu bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forwardpk*tfggpi+) yt(.4 tece/ ,ze as the bus comes to an/4gtefkp y*t egct, e(+ )z.ip immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion xlz8vrsq:vgv :q6d1s2(g o( j of the object.

  The acceleration of an object is inversely proportiong8wi;oc 1:y-0ohp d3b0a slxaal to

  A net force F accelerates a mw0n + :ly7aoytass m with an acceleration a. If the same net force isyt07l+ y:ano w applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces 6vdqi p9nqrx.rk8 +6i7cop 0 wan acceleration a. What acceleratiorn7 cpqqx0k+6wr9 6dvp 8 oii.n results if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thw4skdzus ;,a2dqi , v-is is,z,aq;w4i2skd u sdv- an illustration of

  Two cars collide head-on. At ev idv;v/ofm quyq ql )s)o343+bery moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to t qv+fsb3i43) yq/o ovqm;ldu) he 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,rn hl up ( e5et;(;.5nxohp6th the force which the object exerts on you willheh5(l t;t;h 5r 6e.nn( uxopp

  Action-reaction forcem3n;a 2+ u:8yw avsjgxs

  Action-reaction forces ahwy; 27 wjw*nsu7 lz-k5we wgk vt4c5+re

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to tq8aal o 3t nsc3,)m.tlhe car. Since a o)8sat,nll a3m3qc. t lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth 10 u9 idb/x*mt x2e)ig/ dx0at1pshatpulls on this object with force mg, which we will call the action force. Whahxg/at1xs0 m901/ e ad )itti2d*up xbt is the reaction force?

  A child's toy is suspended from the ceiling by means of a stryt17qbl2 - npkm7fm -ring. The Earth pulls downward2blp k7 fq- m7yt-1mrn on the toy with its weight 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 instantaneous f4ll + z.rhoj,vorce. The ball hits the bat with an instantaneous force, whose mal.+z4jvo, r hlgnitude is

State Newton's three laws.2j75ehk+yj h;p pq(ld

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which o ifwc3v y2y-xq/9wzz 4f the following i /z3y -ziyf2xq4wc9vws true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at //dx)/scg ba*s;ltwy a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N o 3ct46 phaa y4l*d)uzgr a person weighing 600 Nz4a4 6 dl3hyag c)upt*?

  A stone is thrown straight up. At the top of its path, selo5(c: ha z;jmp7 3gdt3t1ryfx,/ithe net force acting on htzjiagsp:, o37x;d51 rl t ymce3(f/it is

  A 20-N weight and a 5.0-N weight are dropped simultaneously fr(/zscju:g tg(om the same height. Ignore air resistance.s/j:gt(c ( zug Compare their accelerations.

  A brick and a feather fall to the earth at their 4zo.u9ml nx0 0 ,7pldoyvg;f fg* ti6mrespective terminal velocities. Whichm0n4olgz.0lxd *i,p vm f;gut67y 9f o object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the 4ok3rf72unlf;zc4h d ceiling of an elevator. The elevator is movir7zdl43n h4f; kcouf2 ng up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string fro:j tyvhsb;p9h d1x q kk8d5z( nnhj,+7m the ceiling of an elevator. The elevator is moving upward, but slowi1vd;x7sj58n:j p hy 9h+qkd,zh(tn kb ng down. What is the tension in the string?

  The force that keeps you fr mt-m95sj)z+ zt7detrom sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton fro pnqc.dr)+mulp i: 2;. whrgd7m rest than it is to keep pushing it withpg2r)wl 7. qudhp:rdm ci;+ .n constant velocity, because

  A horizontal force accelerates sicp9;6;q(m oufrgt6 a box from rest across a horizontal surface (frictio6of;p9i(;rt6 mgcsqu n 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 inclh4,bte+*e epc+8 wakt ined ramp at constant velocity. Thus we can ac 8k,+ ep4w hbeett+*deduce that

  A block of mass M slides down a frictionless plrur hmz *0f/n dvr:l3pz8 u63kane inclined at an angle q with the horizontal. The normal reaction force exerted by the planelk du6/rrz 3pmhnvfuz0 38r :* on the block is

  A block of mass M slides down a frictionless plane incline-/y lave1gnhc e17.ctd at an angle q with the horizontal. Th 1ych7a.vl1-en e ctg/e normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angwmzt4m*ps 9e3fd91t vle q with the horizontal. The grav tdmwfp1 t*94 z39vsmeitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on a +g19ck4baphju 66jjxv8 fg m(n inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration ajbu(h9m f j168g cg+64pkvxj after being released.

  An object sits on a fhlmpk:(pwyo i 44i2r0-o2 nuv a gff30rictionless surface. A 16-N force is applied to the object, and it accelerates a:inpp23024y-(m f ho4aowrkil0fvg u t $2.0 \; m/s^2$. 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. Whatdsem) yzyrfx ;;t kt(i*:rm42 is the average forwa y:)smyt( f;2drk4irm*e t x;zrd force on the car?

  Starting from rest, a 4.0-kg b8kxvq t:d .,ssody reaches a speed of 8.0 m/s in 2.0 s. What is the net fodt. ss:8vxqk, rce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 ma1un6,wvk4 odhoq8qk2e 0e5j /s aftern k0ek518w qad,j6 o vq2oue4h 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 wp3 gefeo4 ,in3ith the same force that you push a 10-kg mass from rest, f,3igne3eop4

  What is the mass of a person who weighs 110 l1db 2f)dmze-yo1 -snxb?

  What is the mass of an object t8qg; ;u0hinzbz.e5wy +cpg+6 kll4wt hat weighs 250 N on the surface of the Earth where the akun p5;4 cw+gzg.q8z yil 06bth;l ew+cceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kse b 0l(zwdlh( t81py*g on the Earth. What is the mass of the object on the surface of the Moon where the accelerl8l(0dwh tb e1(p*y zsation 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 on the Moon. The dt0;bkp kk,/n((y1 dd rjfx,fMoon's gravity is one sixth of Earth's. Compare the masses of the objectsy /xjd td,k1 ( kk(;pnb,frfd0.

  Sue and Sean are having a wl, x*8r ;aggktug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates tow ar*;gx wk,g8lard Sue at $2.0 \; m/s^2$?

  A stack of books rests opy3p*gww:zrq6cym 3o63b mg 3 n a level frictionless surface. A force F acts on the stack, and it accelerates3rzy6gy3gqpc:3b * pom36m ww 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 sjijf)4jw;h x.s3p6udcale be reading when the elevator is accelerating downwar; 4 usjx3ifpjhd)6.wj d at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass nv+axogkzkk *;8 +7ap of the person is 60.0 kg and the elevator accelerates downwgn;a+k8zk*vo+pak x 7ard with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elo h8o 0;bzd(inevator. If the mass of the person is 60.0 kg and the elev o ;inb(80ohdzator 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 van sfm(-8xl ;1ocy,cforce has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitud cx ol,8v;(ymcn1-fas e 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 hraw 1un34kyo)xvl 3 2ield 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 distance if the load is n)nw3 rk42 a1ul3y xvoiot to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in place:lzowg2(8c f c p,i5rpc8:c9- lwmgil 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 slide forward into tcpirp52zc(:lgwlcig: ,8 om-lw c98 fhe cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg an+h zsnl,z 5oz*d m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of thezzo,+z5 n*lsh pulley.)

  In the Atwood machine shown in Fig. 4-179u7wjqncu3rr,9 c5 xca e)gm, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulley.) r)rxcau97wn 7,35m9jcugq e c

  A student pulls a box of books on a smooth hodpp:34n l(l)lfs6grd s;n;7qr dp3ay rizontal floor with a force of 100 N in lp;p)6 dq7n sdla3d:p4g 3; (flnr rsya 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 horizonthuhh 1 63cxf )flm2x)kr1jn+mlbxk*;al floor with a force of 100 N in a direction of 37.0e abmjxhn)1ck* h k mx6rbf l;)xl1f3 uh2+ove 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 shown in Fikiy+.28vn,+ pi,jm.z uvp vi rg. 4-2. What are the tensions in the roy+ji. p i,8u.+n v kzvvirpm,2pes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass ofhnh,fse4y7 yg(ij9f fga065h the traffic li(gjh6,ya0f9gsif4n7 5h hef yght?

  Two boxes of masses m and 2m are in contact with each other on a frictio4 idma1e;9a36 a tyketnless surface. (See i 16a ;3y me4kaetdat9Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m ag-h / ybom 9+wc llr+qo05hnm;re in contact with each other on a frictionless surface. (See Fig. 4-3.) l-gyh0 o +bcwnr/m9 q +oml;5h What is the net force on the more massive box?

  Two boxes of masses m and 2m are connecte6bjl 9zn r/,hnd by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is9 bjl/nh6r zn, the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a ro yff2u rr8x8n-u4 cny+2mk-:wo t,nwxpe. (See Fig. 4-4.) If the forward force on the more massive box is F, what is th2-nt cnmfx-u8 wf k8, n4xy+ry2w:uore acceleration of the less massive box?

Two boxes are connectee ,foq40 4o -.aqjmmlwd by a cord running over a pulley as shown in Fig. 4-5. Boxqe0q 4m fojwa.,-l 4om 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 betwe(rf rt dp+e7z5en 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 N horizontal force is applied torp+d rf7 5ezt( the box?

  The coefficients of static and kinetic frictions for plastic on wood arewcn/l9zuc ;p0 0.50 and ulp9/;cnc z0w0.40,
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 comes to fhl hj y6n*3t jnu z;i0)t9ia2a stop with a constaihztj * ly ;ni90j )h2fnut36ant 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 horijloy/:-eoefo- h -v a5x)g/ex zontal surface is pulled by a 5.0-N force. A 3.0-N friction force reta) 5oxav /x-/ fy-g:loo -heejerds the motion. What is the acceleration of the object?

  A horizontal force of8yjz(omcpc 56fp6-ht 5.0 N accelerates a 4.0-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 pucd .fn0ub-jg 0kk is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What 0-dk0ngj. ufbis the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accid urk d 3hw6p(zd8lkzf 6/o42tsent, police find skid marks 90.0 m long. Th2u6(h /fzk 6ztk8rlpd3wso4 dey 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 st ccss )x tyjpp *pch36/08u5mcacked. (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 sjms* ct pp35y0 c8)6cupsxhc/tatic friction force on the less massive box?

  Two boxes of masses m and 3m+sw 6l3z3mcz;i9no a t 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 i+ t;3lc6 w 39zosmnazrough. 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 frictiygzt 2 xk7 vd8ig6 rpq;xg9i:3onless inclined plane. The plane is inclined at an angle ofgz t g;r8gkqx36xp v2i:dy i97 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a (h w9sds/ qfb0flat 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 with an anglp.x2 6wk ywuji+k0m0y /vzs8fsx * cx2en1cj8e 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 inaye3 e11hm t)aclined 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 inclined planf136 hqwcblq9 e, at a constant velocity of 61lf3q h9 b6qwc.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 slides52ou rnpd2, rc y,s1bszeu; d* 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 mm frd h9h.dq/v l3vc809 m)rex 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 weighing 500 N along a rough surfaceu w5jx8riiv-e/ *bk)hm0ay h; . The cable attached)jwv8yb- ax ki 0hr;ehm*i/u5 to the log 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 f89k;y bsj 4yqrest on a rough inclined plane tilted at an angle of b9 kq;syjfy 48$33.5^{\circ}$ 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. Thrl8hc8 t-n;bb8 lgfs2jtuy0.e angle of incline is gradually increased until the object begins to slide. The angle 8 ;bb82-uf8 cntrl ysgh0.lj tat which this occurs is q. What is the coefficient of static friction between the object and the plane?