Which of Newton's laws best expj7h , 8ulqouq ef(;au(lains why motorists should buckle-up?

  When you sit on a chair, the resul;s9/kyr, sskk tant force on you is

  In the absence of an external force, gy:syh3+njsy ;7)eqcf(mx d( a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAI/v l 82c0ual kvk)d:xoN are suddenly turned off, while2odv0k/v k8llcuxa) : traveling in empty space, the starship will

  A rocket moves through empty spacegj,+wr6f9w3shkf gm-;mqit u +2 x(is in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under thes g3 +w,q9gwkm(rs 2xti ;ui+mfjh6f-se conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moytmi :fi09( x.e-ww xsving bus, facing forward, and you suddenly fall forward. You can imply from this.t wi y9x0wix(se -m:f that the bus's

  You are standing in a moving bus g0poag ,hq qd9/.6uxf, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forwg0h,o qx/9a6upd g fq.ard?

  A constant net force acts on an object. Daq*k5uv j *nbck(z n9.os8g+ sescribe the motion of the object.

  The acceleration of an object is inversely proportp w 2v rnxjab/g):mm5 lv-s+-gional to

  A net force F accelerates a mass m with an acceleration a. If th b3 o,sg*kl.rxe same net force is ab3x ,*.rsglo kpplied to mass 2m, then the acceleration will be

  A net force F acts on a mas rx7izuebv102 zmo ::os m and produces an acceleration a. What acceleration results if a netbuoie 2z ozv07 ::1xrm force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloocyh2k :ig)e+s+l ff)mn will fly away. This is an ill) cyf2hm k:g+)+ifsleustration of

  Two cars collide head-on. At every moment during the colli-rgq3b8 s9n6v m1x xogsion, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second 81os xmrgxqbg639 v-ncar exerts on the first. This is an example of

  If you exert a force F on an object, the force w;50./ wdu2,izhgwya6lyt; py3 crpi which the object exerts on you wil;06;a.lpwz32ywc/ dr5w ipt,gyhiuy l

  Action-reaction forces4,s a/v3dqpz r

  Action-reaction forces aravii m0 s2 n+o2-qks1ne

  A 20-ton truck collides wi*jirf8cdy8gyev*j 56th a 1500-lb car and causes a lot of damage to the car. Since a lot of damaiyd*65g 88*jrc v yejfge is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object witf+rge7na6e*1fx f5fwyp dx15 h force mg, which we wil6 xfgynde*f+1p xa571e 5wffr l call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling l atahv4,u9 f;/env5d by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "ac/5f94lh; n ,aevtdu avtion force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneo w/addn* /p) 2zpryx :hwda/5sus force. The ball hits the bat with an instantaneous foa5/ h/: dwpx dsn*wa)z/r2pdyrce, whose magnitude is

State Newton's three law7f( 7u7hz5cz f;z-wkzt klh8as.

  Mass and weight

  The acceleration due to gravity is lower on the Moon that4q r -uh4)7zjrq oob-do2q+un on Earth. Which of the following is true about the mass and weight of ao+jbo4ur) u4ht--qqo q2rz 7dn astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance ig3az78e qoq x)gf is6-s

  Who has a greater weight to mass ratio, a person a.idq / . +*rx2zsbkycweighing 400 N or a person weighidkx bc q2./.rsaziy* +ng 600 N?

  A stone is thrown straight up. At tp1rxsanie7eh c6u .au*77 0xzhe top of its path, the net force acting on it izxx. ushpri7 07 17 naceu*ae6s

  A 20-N weight and a 5.0-N weight are dropped si.tog c/-++gk9* hm, sigfkmgfmultaneously from the same height. Ignog+9g,o/hkf g mkmi-s*g.f ct+re air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective termbbt br2bda -du+d urn403)w8minal velocities. Which object experien 4d83ru t-d burnbbd)2 0+wmabces the greater force of air friction?

  An object of mass m is hanging by a strinim+p0h mh4a-d g from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the string?m -ph4 +hiam0d

  An object of mass m is hanging by a string from the ceiling of an elevator. Thh4j :gs5j(7): dax dofebz yl;e elevatorx::5o j b sglde4j;yha7)z( fd is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on anf/* ,rgdfg epb/(-fud icy sidewalk is

  It's more difficult to start moving a heavy carton from r x+l6gv1syi3+ umy q*-)uphnpest than it is to keep pushing it w ins 3yuq+1+x)v*- plpy6gumhith constant velocity, because

  A horizontal force acceleapc h+tcc0m bkt5u 52/rates a box from rest 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. What happens to the box'/2+p5actmhc05k t bc us acceleration?

  A packing crate slides down an incllei di(zw(k 59ined ramp at constant velocity. Thus we can deducezdiw l9 5kie(( that

  A block of mass M slides down a frictionle:vzylfcx hp7 g73brv(kj6 7-hss plane inclined at an angle q with the horz7f g:vhc 7kyxl3(-bv p6rjh7izontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides yf .h7rmvfk:gpdgk57/*8skjq r r a -+s4prg, down a frictionless plane inclined at an angle q with the horizontal. Thers*vr 7,-:/8k4rk5j q m+pkhya .g7 g prgsdff normal reaction force exerted by the plane on the block is directed

  A block of mass M slides do6r z5frjq fz,br.1g(f/ir kz :wn a frictionless plane inclined at an angle q with the horizontal.r f( gfjz,z .q6r1i:5rfz/r kb The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) av7;7 t auzpd,wre released simultaneously on an inclined plane that makes an a;tpvwz7 , dau7ngle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionles*u 2lzpo: qeid m gs8ek8;,e9.wvp y2ss surface. A 16-N force is applied to the object, an.we,2ods *2ql 8y ev:mgukizpp s;e98d it 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 to 27 m/s in 7.0 s. 8 (v/y4z jewwo What is the average forward forc4j (owe /zywv8e on the car?

  Starting from rest, a nfs59z3hp)3a l2ae fv4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is t)2nal s9v5pf3ahfez 3 he net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/0 y.upyd.q w/x 8zyk+ps after tr/.yy. kwqp0 zp8+u dyxaveling
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 wit 78a .um;go28dq 3hwuqhsv xl3h the same force that you push a 10-kg mass from resthg3sqw2dou 3a8q xm 8.h7v;ul,

  What is the mass of a person who weighs 110 lg8q8/p; k)izhrzf0le b?

  What is the mass of an object that weighs 250 N on the sur(jkq2k.65kfv rhm/9 /ha q ubuface of the Earth where the acceleration due6uk/a.9rqb( q/kukfhhj2mv 5 to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass2) d wt:u1rttb of the object on the surface of the Moon rd1t t )2bw:utwhere 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 on the Moon. The Moon' 1 h+qiamsh8xq-;j0w2syiq(ps gravity is one sixth of Earth's. Compare the masses2imqs 0wq y h8-ap;1qi+(jhxs of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kh1zrb qy a:8m + *-o.r.bsuxhvj.fit2g rope. Sue pulls with 1ru.ays hb r.h+*zqbf2vtx 8joi m:-.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 a level frictionle8c3.siem-o.gi yuhva r: nwyw r3lz 26z+0bv+ss surface. A force F acts on the stacl3ac.v. y0vgs:u3h+rr6z 2o nwbze+-y ii8mw k, and 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 elevator. What will the scaf45rlo9y3 pw sle be readiw spfy4 95o3lrng when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If thq0nkbe,nvc4 -) q d(yie mass of the person is 60.0 kg and the elevator accelev)n -qb40 e,dky(qcn irates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in aj8elb qu) eq0:.kbvt .n elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an b.t)lqq . 08ekje: uvbacceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One foys n8wav2nxhedf 0 3(:rce has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitu(h v08nswf2:n3ye axd de 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(,4)uazh cew1 ym)vud held 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 i)ud1 y4w za)(uvehm, cs not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a qittwg toue29 z0jzu-n2:4:t truck. It is held in place 4e2 9:gtzz: 0uotw2-qt iujntby 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 the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg,tlv u m- 73(w8mbmzzetj0w u., what is the ma .mbz3v8(utew- uwzl,m 0j tm7gnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-s :-kj45mmvgf l e)9cm5fpxbduh0);:5 smyzz 1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass off))jxmvgh9py5 -zudsf5sm:mzl c;b 5 0mk e 4: the pulley.)

  A student pulls a box of books zmr,s35khrim- : vs:w on a smooth horizontal floor with a force of 100 N in a r-hsrk3v , iz ::5msmwdirection 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 hox:rg 3 1ba)yiorizontal 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, what is the norb oaygx:13) rimal force on the box?

  A traffic light of weight 100 N is supported by two ropes as sht-h9/,7qji wk ud*yicown in Fig. 4-2. ,uk-ii *tcwhdy7j9q/ What are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the qoh8u )7bd t7sz zuy34(yogo8ropes are 50 N, what is the mass of the trafgs4uo7youqz o(t8d z 3y h7b8)fic light?

  Two boxes of masses m and 2m are in contact with each other on a frictionless su-e4,vs)c xdukrface. (See Fig. 4-3 dvk-u,e4)csx .) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a fricty7 sm1 w.x3z 65 p3djq28rokjlfzvv o0ionless surface. (See Fig. 4-3.) What is the net force on the mo68kv3y10zr27 p zjv fjq sx.old3ow5 mre massive box?

  Two boxes of masses m and 2m are c xt bhg/-nd u:/n-6hvwonnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting ropew/g /bnhv-xdh 6t nu-:?

  Two boxes of masses m and8hn3djy::,s+ch/mb2 pisj qm v kk/5m 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massive bob::jv+ sd85k qy sk23jimhch/np,mm/x?

Two boxes are connected by a cord running over a pulley asx5,sp xdc ih+c)a-xg63kky/ d shown in Fig. 4-5. B/yhikx+36s k ga x dcd)-p5xc,ox 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 v ,d. o cl5p(rzdk1eh0box and a desk are 0.. ov15ddre l0pk,cz(h 40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static andaxyr * s)*41nlg:ou fr kinetic frictions for plastic on wood are 0.50 ando g*1:)nlrau4fry*sx 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 +x direction)vkdndihq aclub/ ) )/b p7e,3. It slows and comes to a stop with a co3,ncv/ibude d)l )pkh b)q/a 7nstant 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 pu o;8;d s*1+lmjedmpsdlled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the ob1 s;mj ;lmsed8d+odp*ject?

  A horizontal force of 5axv 2k6qtlld*iu: (r9lxz) v2.0 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 an in0w:wtqrm bvkl9) +q-a itial speed of 10 m/s. It slides 50 m on the ice before it stops. -vwka0bqlm +tr9 q)w:What is the coefficient of kinetic friction between the puck and the ice?

  During the investiga z7 ba7/8 gtmes,5t 9phrem2gn1)dauation of a traffic accident, 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 warsupe/,e m 1n)m 7ga89gha7 dzt5t2 bere applied.

  Two boxes of masses m and 3m are stacked. (See h fwum0 (jit:x80qhg.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 massiv utwm0(x8jgh i 0:qfh.e 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/o7 hnb.qwks0 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 massiqb 70k h/wn.osve box, what is the coefficient of static friction between the boxes?

  An object is on a frictio.ol1 gd oc 4ny:eri6i*nless inclined plane. The plane is inclined at an angle of yrdno1 oi: ge*i46lc.$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes a(4 w1(5qnrfhuiku zh)n 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 wi ;sara7utn 2kz*6fgf,g o)n;bth 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 rk2sl7 do- c:r (jf7feof $35^{\circ}$ 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 esv,j8lv z70a directly down an inclined plane, at a constant velocity of a08,s l7 evvzj6.0 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 slides down a roulzh 1jeh30 n n;q tm;7i723nrp+dbvci gh $37^{\circ}$ 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 dowb j+-oc1rtwnbo - 1 el0hz(a1hn 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 surs 06x al5-uv/ocl-,h fvav;ivface. The cable attached to the log uvcl5hv 6-ia vf-v 0ls;o/a,xmakes 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 fromfec/azh m0)q; rest on a rough inclined plane tilted at an angle)/he maqzc f;0 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 an inclined plane. The ang ektup6o q9(;xle of incline is gradually increasedo6qe9; px( tku until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?