Which of Newton's laws best explains why motorists should buckle soc g /a3ehr1qm 6yn1(;wv+ns-up?

  When you sit on a chair, the rch+h yn48s)aqesultant force on you is

  In the absence of an externa ecqde/bd7))lpyd ,f(7ny4s6ciq- ah l force, a moving object will

  When the rocket engines on the starship NO-PAIN-5: tcc,)u7trdw 0dk1zrykpzgae h 9-+NO-GAIN are suddenly turned off, while traveling in emr- ,)+gc1z:py e5kdt 0k9hrw czd t7aupty space, the starship will

  A rocket moves through empty space in a str6fzcx. b1lq nml2,b8n aight line with constant speed. It is far from the gravitational effect of any star or planet. Under these condi61fln b x28qzclmn,b.tions, 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, 2 oscc(1u(v j8 ,otq- rmaql-oand you suddenly fall forward. You can imply vtr cu- o(2l ocsam,8 q-q(1jofrom this that the bus's

  You are standing in a moving bus, facing forward, and you su0lfw/ojb3vq g23 6 udzddenly fall forward as the bus comes to an immediate stop. Whatvl2d 3ozw06 /3gjbqu f force caused you to fall forward?

  A constant net force acts on an object. Describe1 *w:sgwbh9 .yzvb:b3 ek6eji the motion of the object.

  The acceleration of an object is inversely pro+6tdiw-ow)boe:( kbf portional to

  A net force F accelerates a mass 4xll8 zzi 0sqye,4emiu4w67 sm with an acceleration a. If the same net force is applied to mass 2m, then the acceleration llmxqes7 i484u46isz, ez0ywwill be

  A net force F acts on a mass m and produces an acceleratiol 60g3-7(md ozcbyzb-q-gboxn a. What acceleration results if a net ford3mbo -(gzbyblgcq0-76 zxo- ce 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thi.zjok w6j1fs- s is an ij k.w6so1j z-fllustration of

  Two cars collide head-on. At every moment during the collis.uoatxq)q 70 0 5pojpndi 9ro:ion, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the9i nu0 xqd p5p:.0o tjaroqo)7 force the second car exerts on the first. This is an example of

  If you exert a force F on an object, the (:+cb/l g1t.tjtt h wgforce which the object exerts on you wi:t1/ g.+tt bwjlchtg (ll

  Action-reaction forcesvnru/8 mg34n0zhwl o 0

  Action-reaction forcem1gp:kg8uqdbk ztj or*.( 8 ,rs are

  A 20-ton truck collidew nk ,rh+va7*flpd;(ipo .ad(s with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on th,pihp(lnddrakw o;+7vaf (.*e car

  An object of mass m sits :;l m2(w8ogsprti (snon a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaco2g;:(8s int wmr ps(ltion force?

  A child's toy is suspended froxj4px r1hxu65oa y0 o:m the 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 "action force," what is tuo4xh:x0j5 6axyrpo1 he "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous fo94ewx u-qg ;8 hs5nrygrce. The ball hits the bat with an instantaneous force, whose mw -qg9gu r4yne;s8hx5agnitude is

State Newton's three uwm (2g+ 4gxba/y.shn laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Ear1+sn-,pdmn7p khcfj .th. Which of the following is true about the mass and weid. - jcnps+nh, kfmp71ght of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which v7a4grmfj8s; fxk:d1 acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a personq/edvz+l 5,4h v uv+tep8rja: weighing 600 N?z/ 4v: dhp ra+ +lvuqev,e85tj

  A stone is thrown straight up. At the toj6gj nj 2lm;:4g)gvgle1 jmc+p of its path, the net force acting on it g lnjc+ )l26: g4gejg;jmmj v1is

  A 20-N weight and a 5.0-N weigh tptm f xd9zl 905juc:l ojp)b-3lc,x)t are dropped simultaneously from the same height. Ignore air resistance. Compare their acceleratiolx9p 9d-mtz3,:t)c5)x f llpubcj0jons.

  A brick and a feather fall to the earth at thei+5 n 6xqxhafr7r respective terminal velocities. Which object 56n7xhaq r +xfexperiences the greater force of air friction?

  An object of mass m is hangirlan 4knt9 7m hjpu+ zqst(838ng by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in h8utp(4nq+ak s jz 8m9nlr7 t3the string?

  An object of mass m is hanging au qhap:93 b :;m)hzfbby a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension a; 9zp a3hb:f:h)umbqin the string?

  The force that keeps you from sliding on an icy sidewalksa ae1 ny4egfq0 --qs*k0(swx is

  It's more difficult to start moving a heavy carton from rest than it ineyip35gi1r n; nud *36v.tlos to keep pushing it with constant veyin.5d*i p;v3l16nguotn3r elocity, because

  A horizontal force accei (bdnr* g;9qelerates a box from rest across a horizontal surface (friction is present) at a constadrb;9*nqg (ei nt 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 constant velocity. Thus we can cukd9e/(w r 0ndeduce0wdc9/ r (kenu that

  A block of mass M slides down a frictionless p+a:s kqc9*6 lmzf vdfolgt4bgb (- l(hz1;dv -lane inclined at an angle q with the horizontal. The normal reaction:dhbs 1lf*qvo46dgf 9v -(g+ c(;mbzklzta - l force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q with28 2i8 oh2lxll nmq,vi 7nn9bdi ,,dun the horizontal. The normal reaction force exerted by the pl 79n 2ln in,,iovdd i b28hmn8u2qlxl,ane on the block is directed

  A block of mass M slidemlt) )v6)ox cgs down a frictionless plane inclined at an angle q with the vtcglm)6ox)) horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneok 42b+l ycdi)zusly on an inclined plane that makes an angle of 30e with the horizontal. Make a state2i d+4y)kzlcbment which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N for sa.),)z ;1r8;t ld xrbdoxgrpce is applied to the object, and , ogaz;x; d).t8bpxrl r1)rs dit accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest jnvq+slyh (pdc*67. nk+(fb0n 4w v muto 27 m/s in 7.0 s. What is the av 0kq vshy.+j7bfp4ln (d*uwmnc (+6nv erage forward force on the car?

  Starting from rest, a 4.0-kg2* ojv. -acznm body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the bn oc2a-mz. *jvody?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed:s, z-a01yv hrzx6enq of 50.0 m/s afteh-r1y6, vs: zqznex0a r 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 with the same force that you push a 1 -fpxnr-60:bomz ( tbp,1 jgum+wh*tc0-kg mass from rest, jb -m-h*n0r+tzcp b p1xf(6uwgmot,:

  What is the mass of adkchz-vk+x4 9p4jv4t8* toz f person who weighs 110 lb?

  What is the mass of an object that weighs 250 N ov bbg-qv):f ,pn the surface of the Earth where the acceler,vgb p- )q:bfvation due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg opc mlq0l5x(1l n the Earth. What is the mass of the object on th(5plq 10m clxle surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and cq6i loe(c/4qd0k w6cobject B weighs 40 N on the Moon. The Moon's grqwcq(4 o c6id0ec6lk /avity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling oeg: 3;2qn cy;x4m est.0xfdbb n opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's2m:;sf4nd0txe b 3x q gb.;cye 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 act l0ey(uo 7k0pos on the stack, ank0up l7 (ooey0d 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 elevatxfv24pz.t fcj )q( o1hor. What will the scale be reading when the elevator is accelerati(z)xt qf4 c1o2vp hf.jng downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elev ovv 9q,m;egv8q:at6bator. If the mass of the person is 60.0 kg 9vgbqtqm8;6o: v,aveand the elevator 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 l9le hs1 0xovfdhz0mtk082r0the person is 60.0 kg and the elevator a9hds 2e10x z f8 00ltv0mrhoklccelerates 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 oqi 3z1 )cs/k 0jbm:tcvf 8.0 N and is directed due nortbmc 1:ji/c) 0zs 3kqvth. 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 a6 +wg jib hsus7n*a0n8 truck. It is held in place by metal brackets that cs6uns 0n j* gb7iwh8+aan 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 ihh/xg h m 5ecr;3-b/ke+;np qnn place by metal br h mh+ee;n gq -x;ckn35rbhp//ackets 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 the cab?

  In the Atwood machine shin-,nsp3bw.b *m* snwown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the ac3sb n*w.ni-spm,* bwnceleration 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 = 0.40 kg, what io 79 s*db(7cx5qkb ogbs the tensiqoc9g bb5x*(7k s ob7don in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box f* mvuilr;8 v v3gt2m)of books on a smooth horizontal floor with a force of 100 N ivvmgfvu8);2i3t m* l rn 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 horizontal ud)uh- knx ffx wv msw rl2f( c/uky8ha,-(325floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the bookc)-(v5h( 2ufru s 32wnx xhafl,-/y ufkmk8 wds 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 Fig. 4-2.cekh 4 /8 vmwwm)5:lht What are the t:5chwvh mel/mkt ) w84ensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is thek* v5k otz9uhv5 myyrk*24e7 e mass of the traffic light e*z2u otkvmk9 57hkr54vye y*?

  Two boxes of masses m and 2m are in conyzo3,e nx4 tt,tact with each other on a frictionless surface. (See Fig. 4-3.) Wh 3,4xoy,tt zneat is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other or;3gshn:zsa9pg qoqi 3dr0 db77*1w in a frictionless surface. (See Fig. 4-3.) What is the net force on the more massi*s 703ggh w3dr: aqds rz9 oq1p;bii7nve box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4o-nizr3ng 5 dvu-i-1u d.2miu-4.) If the forward force on the more massive box is F, whau vzr-n5 md3d-gnu2 -oi.iui1 t is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected be-c.o s2,9t, /w)ze( hcgn anh-rfrfl y a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of thf hs e, 2n nt(a.)ecw-lr,ch /gofz-9re less massive box?

Two boxes are connected by a cor8/gonzg 0ww4f 1pi* nld running over a pulley as shown in Fig. 4-5. Boxil wwng zno*p/10f84g 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 staqoyen *;9gg mun1r;cg0/nd; cwe *z f7tic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net forceey;eg f*c omg ;wz*9/qgr 0;dnuc7nn1 on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plasti) /f 9eraiqz /qa50irjfzvth-2yq)5 i c on wood are 0.50 an5aqf ifz)9j/qrqah e)ii/ty2v -r z 50d 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 +xtj a y9s)v;zc0 direction. It slows and comes to a stop with a constant accel9ysc zj;vt) 0aeration 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-Nrm3. d6;htyg6ium k q9 friction force rmki6gy3 u6.m qt ;hd9retards the motion. What is the acceleration of the object?

  A horizontal force of 4a lqaj1nk/sf1dp (cac ,p16t5.0 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 puck is given an4/db ,io 4+h1jz czi/v uol.ch initial speed of 10 m/s. It slides 50 m on the ice before it stops. Whatu+z l1i,.h4 z/bo/jvch4iodc is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident7+r 16rb y niwv*4i/ reja7jae, police 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 ap*w+/rnj4ar be6 ayvj17iie7 rplied.

  Two boxes of masses m and 3m are stacked. (See95h m0u9ucj x/ttfeo3d wf0z ; Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooow t/fe d 0zt95cx;0j9u3umhf th 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 an a af p 8fo34ac6ei8ue,2uia0hd 3m 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 coefficient of static friction betaapi 684 oeh fuefa8 0,ia32cuween the boxes?

  An object is on a frictionless inclined plane. The plane is inclinl-o(;yhbqak(;ds 5yik8l ; f hlt9q3k ed at an angle 9aqt53l(qkdbf; kll 8;iyshhkyo(- ;of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an gi )q 0n(ayq6l* nil6kangle 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 aingu:a:eil-di23:xcz vfgsk/b 4 c4 *ngle 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 66z*y8ubhlbf b:hst4 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 constantooy7)3y.hnbfbdb 96 b velocity of 6.0 f bd3bynb9o .)67 bhyom/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 rou7m1yq0wf t)o kgh $37^{\circ}$ 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 dmhyml emjx*dav8vk03 1:+,vg own 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 rx gr9;f i7/jm *9*ax4sy ysxjkough surface. The cable attached to the log mgsxjmky x*a*f; 4y 9rj sx7i9/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 from h8b 19suucnf2rest on a rough inclined plane tilted at an angle ou9us 1nh2f bc8f $33.5^{\circ}$ 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. The angle ofpaxsb r a;p)ao11 vb;87a5jq t incline is gradually increased until the object begins to slide. The angle at whi ) 17 5sja8oqpx b;v1taa;abprch this occurs is q. What is the coefficient of static friction between the object and the plane?