Which of Newton's laws best explains why motorists shouk68c6dm sd27 v yjvro:ld buckle-up?

  When you sit on a chair, the resultant force on(+( er1s3ug(;qjum o;m rdh ylzq dv-2u;u vu2 you is

  In the absence of an external force, u-wqz/ 65umwba 9ed,t a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenlfzo 1pr-opuad0 d,ms(f1 ld,:y turned off, while traveling in empty space, the starsu op1, mdsfddr:, 1f0-a z(polhip will

  A rocket moves through empty space in a straf/i0o 9x;seel ight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the forc e;f9 oix/0slee that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and youjt.gw5 dm ,p7;t qyn5k suddenly fall forward. You can imply from this that tpm;j5w.gd7t t5n q,ykhe bus's

  You are standing in a moving bus, facing forward, and you suddenly fall foaeq:s up(e .)prward as the bus comes to an immediate stop. What force (s :pe pqu)e.acaused you to fall forward?

  A constant net force acts on an object. Describe the motion of thi b+)y 1 )tqs-:enbdm*q)mggl euh*8je object.

  The acceleration of an object xptzo.sh9/j n(8 v x9ris inversely proportional to

  A net force F accelerates a mass m with an acceleza7 xtmj/ qk 52liv3/z b8jpm2ration a. If the same net force is a bm vi8ql/j/5mtx jz227kp3z applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an aqtz 4wa)2)h gzcceleration a. What acceleration results if a net force 2F acts)2w tazqh g)z4 on mass 4m?

  If you blow up a balloon, and then release it, the balloon will 0 )izaxz8q.y(vr0ua; d yz-i9reoh u:fly away. This is an illuszro i9.xz)y8izrd(q - 0uev:hay 0a;utration of

  Two cars collide head-on. At every moment during axs ch*y7p lxg x) :d8dg2)wdw(7j:l ethe collision, the magnitude of the force the first car pc 8dw)s(w g7 xejl)g:a2dxd*y 7l :hxexerts on the second 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 the object exerts on yo5k.: l+j xadvtu wi5lxa: .djk+tvll

  Action-reaction forcea,gido80 (j 3k0 eudi,4tk9 iaxc-urgs

  Action-reaction forces rsgyke2 o0m;9/ i+yqar7nl:y are

  A 20-ton truck collides with a 150fckz 9y /1oc,v0-lb car and causes a lot of damage to the car. Since a 9cf 1y/kc zv,olot of damage is done on the car

  An object of mass m s59 boh;ceu(anits on a flat table. The Earth pulls on this object with force mg, which wbh9 eno; 5uac(e will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by meang;v3wg8: ls s59e+jw sy q)tdcs of a string. The Earth pulls downward on the toy )vjcyw+w35 9dss;gq slget8 :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 force. The ba0bt5 rvhj) 2+m+y-xgnk6 n1xg- jovzkll hits the bat with an instantaneous for+0gz yjjth x+rv-6o k-nv )5b1mg2 nxkce, whose magnitude is

State Newton's three lanfsv l ryfj.rv b- n (i3qfu1)lnv);32ws.

  Mass and weight

  The acceleration due to gravity hrp)op :by.2f;wz/v his lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surfawvbo :rpfh) /yz; h.p2ce, compared to Earth?

  An example of a force which accqgpn pg95 tip2h5;,n ts at a distance is

  Who has a greater weight to mass ratio, a person b3a asb o4w;gyn)q7z1weighing 400 N or a person weighing 600 N?oyzq g;a147 )wnb3as b

  A stone is thrown straight up. At the top of its path, the x+3dh b/7vgs knet force acting on idh/bg3 v+sx k7t is

  A 20-N weight and a 5.0-N weight are droppklr8tvehp+da 8l3: : ni; 86ejhh5ty oed simultaneously from the same height. Ignore air y; d +lva l85thkehn o3:t :jhirp886eresistance. Compare their accelerations.

  A brick and a feather fall to tdc 6s)pdzm* s4he earth at their respective terminal velocities. Which object experiences the )scmd6z s*p d4greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevat 9p20m2po tsigor. The elevator is mo9io0pt m2g s2pving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceidr o8wqdc5wmy )),ut0cnx m .*ling of an elevator. The ele0md*m)uydwxo w cq n5.c,)t r8vator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps yt:)sf rj hcem j+r/4c-*hwty)ou from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it imkn824;,o a.iofk0wcap a x3 ns to keep pushing it with constant velocia am,48;a0w. 2x knoicno3kfp ty, because

  A horizontal force accelerates a box from rest across a horizontal surface (fzaa 0sa3p1ey/23koz friction is present ezpo s3y1/k aa0a2fz3) 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 constant velocity. .qb4ud jonwj*/ 15xto* 0jhy uThus we can deduce thathnxu0jjb**od4o/ w5 ut q1.yj

  A block of mass M slides down a frictionl g sol0,o m3ge2gcwt30ess plane inclined at an angle q with the horgowmtesg oc20 l,3 g03izontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictioy6*ah0 1hv i a+h2rpsjnless plane inclined at an angle q with the horizon ja*1h+viah r6ph s20ytal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless planwo 7j/o,3jr3o9( m ,af lfazuqg* l*qke inclined at an angle q with the horizontal. The gravitationaqoa7*k *l93z j,fogl3jm( wqr/,of ual force is directed

  Two toy cars (16 kg and 2.0ei :t n:uc 67wjwg.ci: kg) are released simultaneously on an inclined plane that makes an:w 7ngi. w:cuejt :ic6 angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N forn tk08i2r-o( uctez4x d/ou9dce is applied to the object, a/r4do d8 (0uxo2nte u-ti 9ckznd it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can acvvl2g *r *+pft*ekt7ccelerate from rest to 27 m/s in 7.0 s. What is the average forwal e* cvp*g rt27k*t+vfrd force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. g43/6oj h1u adpzln7ax jp1y; What is the nx41 n a pp1az6gujhoy/jd3 ;7let force acting on the body?

  An antitank weapon fires a 3.00-kg roj 4a wtfd2 -rek4-v.vhcket which acquires a speed of 50.0 m/s after-.vkhj24w r f 4ae-dtv 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 push8c),bq)o97y dobh( (koppt ih a 10-kg mass from rest cqp)((8)ytdbhb kh op7 i,o9o,

  What is the mass of a pers i7)p0szwh5x: n1uzyf on who weighs 110 lb?

  What is the mass of an object that weighs 250 N on ttdg 0-r m:cl khv,74erhe surface of the Earth where the accele-l, gvc0dmr:r th47keration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of th7k5zejoa2n,,y k- vjke object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Ea n j7y,kekak-z5j2,vorth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The zrwhg*4z/ hn 0Moon's nh*zz0r wg/ h4gravity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposij84.ru/4mv w:aj tf mfv f;7td4q4tcm te ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Se4 mvrdq84c t:u .;ttafmvfw/4 jf4jm7an's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests,.sw: wc,aa3. p0,ouegpb s2ixpq ;t v on a level frictionless surface. A force F acts on the stack, an ps:uwc0,qs tv.wi ap2bxe3o,p .,;agd 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 onth :tv f6l :fint6r*-zuz-3hv a scale in an elevator. What will the scale be reading when the elevator is accelerating downwa6*thh-::ftvtzvu z3nf 6- il rrd at $4.00 \; m/s^2$?

  A person on a scale rides in an elt5rp7azy1 -dn evator. If the mass of the person is 60.0 kg and the elevator accelerates downward with 7y-rpan5t 1 dzan 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 the persoxxx9f0z 8y 1qbl1 o kq2l9+zpyj ony*+n is 60.0 kg and the elevator accelerates upward with an ax 8zy+*p 9kq21x 9xbly+o0jqyl zfo1ncceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. On:-um tklq.b0 ii:mb5y e force has a magnitude of 8.0 N and i5 uymqik :i-b :l.m0tbs directed 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 rest 5lwa6 xl4g2g ,)edo5 f+hvldas on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Whenw652v4 deh,glg5f l)aldxo+ a 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 truckqg:lk ,+0xrez.nk ov) . It is held in place by metal brackets tha0ekxk:l,o) g v+nz .rqt 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 shown in Fig. 4-1, ig1gp*h8wt r5c5 )iue0fz-/hv wsq,ugh qt6 3 if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and th hrgtiqquhwtw3 gfg 1u6sh8ep ),vz05c-/i* 5e mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0yt.w(v2tydr6/f cr i j /(umm0.40 kg, what is rt6yrm //i0j fmtuw2cvd(y.( the tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a imc*th+ 8oo/vsmooth horizontal floor with a force of 100 N in aicm/ +t8 h*ovo 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 b5c72zv cq8(qe(lk 9, jnj4iankb q9d 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 is 40.0 kg, wq(99c j(q875lj,n2bdzben4ack vk qihat is the normal force on the box?

  A traffic light of weight 100 N is sup8j bqmfkq-c+ u-pyhfi p j3kz,q-1-+gported by two ropes as shown in Fig. 4-2. What are the tensions in the f3kp,-8y+ ij hqpuj-c b-+qz qm- g1kfropes?

  In Fig. 4-2, if the tensions in tq(j 7sc7zk (hq7bjr0r he ropes are 50 N, what is the mass of the traf rs7k7zq((b0j qj ch7rfic light?

  Two boxes of masses m a/5z9 bifd:; qkogvz c2nd 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive bo bzzok9g5qdfi : cv/2;x?

  Two boxes of masses m and 2q11/xn,c /;bepq +aogw 7qftdm are in contact with each other on a frictionless surface. (See Fig. 4-3.) What i x/foga+eqdqcq,1;bwn 7t p1/s the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rop kolx;p 17,-;fg drn;t7fi kbbe. (See Fig. 4-4.) If the forward force on the more mas 7dfbt,rk-xf;7klp 1 b;ngo; isive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4a; rt1:a . 0s t58ufpv5xyixhg.) If the forward force on the more massiug;x0ta fpx:i5 v.8ta h sy15rve box 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-v2s 3gse;p.od5. Box I ofed sov2psg3 ;. 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 destzi wu)y,q)*)qijmrl1ck5 *b 9 a0n wek are 0.40 and 0.30, respectively. What is the net force on the z0 qciwilrt)my 19 kqa)5wjn*e ,*u)bbox when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for pbxq tj5,vvl o gu(:3ib./gy7qlastic on wood are 0.50 and 0.lg,gbo i( /qx7qvv5b j.tuy3 :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 w0fu;isjja:w nf3; r). It slows and comes to a stop with a constant accelerat);fif3wn u r ;j:ajs0wion 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 forcri* ,krqy)jp) e. A 3.0-N friction force retards the motion. What is the acceleration of tr,pj)k)iry *q he object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from resuxhh z8een(e*qm/ 1 wenrj71v pq u8;3t, 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 ini*3; a*vlwcsu stial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinsa; 3* uvl*cwsetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid mark;9kd, u yvas66x+wdyi s 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 y;+wky v9dxia, s du66the car when the brakes were applied.

  Two boxes of masses m and 3m a.zu mta/kp xetlp/);2r b;qx9re 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 m ttkpq.z;l ;mx/)xr2e9 a/b puassive 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 are stacked. (See Fig. 4-6.) The su50j so9 kyf;z5i;;ck2amh dv grface between the more massive box and the horizontal surface is smooth and the surface between the boxes is;i;9kf5 ya5okm2 zhs gvc0d; j rough. 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 frictionless inclined plan g07f60kyx( m o5jzvn6ajf8yxe. The plane is inclined at an anglvzj kxna7f6myx8 00go jf56(ye of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a ce .5)zn9tar3f mj5/jhhb co)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 with an angle qnm6w)mvgvx5 m8v;d4of $37^{\circ}$ 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 inclinnx03j )x ,f bn8 6zdi.,rdjb6hk kyg7oed 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 plane, at a constamzfif i)kn )( h)i-is4nt velocity of 6.0 m)m f- iinzh)s )if4i(k/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 px3* :)whc. q+rcbbfmslides 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 dowj pto), bb5b u)wjt 2)sw,t1rtn 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 stl-(0q9ylq ygf3w: cpsm n.)oixu89f urface. The cable attached toos9gw q.c9(3 fl8lu-)ixy:qt0nypf m 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 rest on a rough inc+drgok dho82 4vvh. u+lined plane tilted at an angle of +oo4rg.uk8hvvh2 d+ d $33.5^{\circ}$ 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 of incline id-cy0x omyl7hf5(5m hs gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the ohho d5xm-( 0 f7y5mclybject and the plane?