Which of Newton's laws best explaid bzftm03 dvgk17 7-)aem vci3ns why motorists should buckle-up?

  When you sit on a chair, the rq.k7hbb s.8t c4czi; lesultant force on you is

  In the absence of an external force, a moving ;9-trqk(8lesheol y b 6:an .xobject will

  When the rocket engines on the starship N2uwp afq b34epd/-mw, O-PAIN-NO-GAIN are suddenly turned off, while traveling in empty spa fpwq/,2pm3duaw4 e-bce, the starship will

  A rocket moves through empty space in a straight line with constant speed. rnsi6aj; 89 ttld+f h7 It is far from the gravitationl+ft;69thrjdsni a7 8 al effect of any star or planet. Under these conditions, 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, and you suddenly f )rtp8n/,cw op, sc7lcall forward. You can imo7sc/nclp ,r8w) ,tcpply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fal8zorlh zi+tl7/1 7 fca*,dhwll forward as the bus comes toi*fzl8 hd/7+o whz7llat,1r c an immediate stop. What force caused you to fall forward?

  A constant net force acts on an e -k a63nql3wpobject. Describe the motion of the object.

  The acceleration of an object is invv9 y .aak8*ozjzt3 kev6/k,apersely proportional to

  A net force F accelerates a mak znvej;mx-evg b3 ;-3ss m with an acceleration a. If the same net force is a b mk;3jexv--3zngv;e pplied to mass 2m, then the acceleration will be

  A net force F acts on a mas0m(q* xwijf(zs m and produces an acceleration a. What acceleration results (j(mfq0i*x zwif a net force 2F acts on mass 4m?

  If you blow up a balloon, anl;9upq3po p/ :.8lksk/ gms yplouqe 3bu 5x;5d then release it, the balloon will fly away. This is an illustrku eq lpm5ousby3;qu s/lx o;5p:/.3 89gpplkation of

  Two cars collide head-on. At every moment during the collision, the magnitudx ulw9w 92l/sze of the force the first car exerts on the second is exactly equal to the magnitude of the fo9z/2 xsw u9lwlrce 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 ex;.6 g3fnc j-ss 7ltlfgerts on you will sg3;gfnj f.t ll6c7-s

  Action-reaction force )+iovh d8n)+o-l z *apm-e6kfgjr2tus

  Action-reaction forcd8/ nciuv4,io es are

  A 20-ton truck collides with a 1500-lb car and causes +w xvfa2. u3nxa lot of damage to the car. Since a3fvw xa2 xu.n+ lot of damage is done on the car

  An object of mass m sits on a flat table. da1( m:o,rq nlh*otj x3l (d+kThe Earth pulls on this object with force m*x,+ l3moad:jo k r((ntdhl q1g, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth tnit3+r z cif28ryt6.pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," wha32 ntcyr zri+6.tfti 8t is the "reaction force"?

  Your bat hits the ball pitched to you with 5cku* pkci55vuq(0 o3tfs;6m x4 dgbaa 1500-N instantaneous force. The balfdgm xu(ctqo sa5 vi5 *p6u45k;kc0b3l hits the bat with an instantaneous force, whose magnitude is

State Newton's three p 9rugl4lpl/l b, y3y+ k,ylo4laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on7p 5 - (oxudsp.;dh7hy4+2xehdlv dgv Earth. Which of the following is true about the mass and weight of an astronaut e7 ushg-oy +(d2h hdp7vp. xl;ddx 54von the Moon's surface, compared to Earth?

  An example of a force which acts at nvo*v+hz51/pk z q7vtp3m(pd a distance is

  Who has a greater weight to z t7*(0mmlg gemass ratio, a person weighing 400 N or a person weighing 600mg*ge 0(7ztml N?

  A stone is thrown straight up. At the top of its path, the net force 9b1/rqm d 7 i6hxa0iftnogg;.acting on i.9agmb id nfro70g1/hxq ;6tit is

  A 20-N weight and a 5.0-N kq ko+tcg1-1k weight are dropped simultaneously from the same height. Ignore air resistance. Compare their accelk1kotg1+ k-qc erations.

  A brick and a feather fall6,pqkkv0m 1 v5xkyse9mft. ; v to the earth at their respective terminal velocities. f xpk;1v0mse,t mk659kq vv.yWhich object experiences the greater force of air friction?

  An object of mass m is hanging by a stt8.;ggl agu 9zring from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension 9;gtua8 z.g lgin the string?

  An object of mass m is hanging by a string from the ce*/0,ifdvvpxp oi hplp p1.0c: rf16q jiling of an elevator. The elevator is moving upward, but slowing doip0j6d1hvlrv*:,pq fp/fxoi.pp10 c wn. What is the tension in the string?

  The force that keeps you from sliding on ancsf,e 3v8j4 tiz/cu)z icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to kee9q: odnwl;fg4 p pushing it with constant velocity, beca dg;wnl4:9 oqfuse

  A horizontal force accelerates a box from res:l 1ub1 vtj vj 7h5e*1pl56qi li (n;zayjh4ggt 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's acl*g 1(jzh 4y5jb gqpij6la71u 1 v;nv:5heiltceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus we can:bk5t; /s;3f5lvg-p l rovxgq deduce to: g5 flvqvpls-k/;5 xg btr;3hat

  A block of mass M slides down a frictionless plane inclined at an angle q with bj /w-,r6wpijthe horizontalwjri/ b wp6j-,. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q with8 eudz0(2(; n lzp)o yf-bzati the horizontal. The normal reactioz 8oy fez(0 zdntu2a-;p(l)ibn force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane jvae-. -wl0 hj.kh -zvinclined at an angle q with theje -zvhwhj lavk--..0 horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are releasec0fg,wb+ c)p xd simultaneously on an inclined plane that makes an agx)p w+0cfc, bngle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless siny vf:(+b94qvntp v/urface. A 16-N force is applied to the object, and it acceleratesnpi 4n qv( 9fv+b:yvt/ 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 7pke 2*0ixe.u )d cylmk2i,q2y.0 s. What is the average forward force e)pi ,likdk2*.yuy2m q2ec0 x on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What ir.r3cxt +4)e x:rvaoqs qo.:)rx e rcvr 3t4+xathe net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires caf-+bg(w ;y sb 9j/dp *fnml6 z0e)haa speed of 50.0 m/s after tr (pfd09*zgen;b)/s h 6bwalc+yf am-j aveling
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 yo1q( t7ohrej,cir w5z11os3pe u push a 10-kg mass from rest i1rjtr57hwop1ezqc 3 1e, o(s,

  What is the mass of a6yzg xy279j s. v0hpx9 vdku(p4(k spg person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of z;t3c6 0.fyzr rcx:j gthe Earth where the acce.rfg3rz y c0cj:;z xt6leration 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 the objecty 3un.9-mqrdrzs+af) on the surface of 9f- qusr3m.azyd+n )r 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 object B weighs 40 N o lqit s8med,5d0)e4+2ib aypan the Moon. The Moon's gravit) p+m2isqd5 aeiab8l,0d 4ye ty is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a t t7mzi1ggh1otg:7mj. ug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with at mj1zg.go: 77mg1ih t 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 frictionlessz:y+ l+essu0k surface. A force F acts on the stack, and it accelerates s:+ +lz0usy keat $3.0 \; m/s^2$. 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. Wh8r) ajm zu :,4+b w/gnp fwtn)pqq3iv;at will the scale be reading when the elevator i atf3b+ q;)q:zg8 nu 4 rn)jmwwvpip,/s accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the persobflk ,k4lb9ayz5:mv 3 n is 60.0 kg and the elevator accelerates downward with an accelerzl a3 ,ly fb:9vbm4k5kation of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevngmq. -)x.s*skid5r ; ly zq2dator. If the mass of the person is 60.0 kg and the elevator acc);s.d-rm xs dn5 q2qkzgly.*i elerates 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 a2 y p2p(0*fkd:pax -hip;dm w--nsygp magnitude of 8.0 N and is directed due north. The second fo w (h*kd 0m; pxp fi2-p2-yd:npsypga-rce 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 h w+rpnw8sxn2 x3/ xzh4n(dj8celd in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck inj 2r(3p8whnxd8cnw4x /+z xss 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 thc1em3e)w scbd / mxaa1lf86- 8suhyr; e 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,fcsc x h/6a1lm88-b1 ram3dw;ysee)u 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 kxi iycmad9;/:1q a9l v1un9jxg, what is the ma; c9nq:9 axdxiyv uaj1li19m/gnitude of the 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 = 0.40 kg, whatl9 e5ogailf;el/wh -hb8* bp4 is the tension in the string? (Ignore friction and the mass oflhpbf95;ew4b*/ihgao- 8 ell the pulley.)

  A student pulls a box of books on a smooth horizontal floor withb o 1thz/vnf+yzz31aq *41k of*cryo; a force of 100 N in a directfaq 3ozk1h*n;y+bcvy41f z 1ztoo*r/ ion 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 floor with a force p wpklf5e/x.s o1a. 78,ko8svctk: fuof 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0o.ptspx8k8/s:.woe5, k c1f kl7f auv kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown 8ogr 6 ncv(pp+in Fig. 4-2. What are the tensions in the ropes8+opnrg 6v (pc?

  In Fig. 4-2, if the tensitv-,,e1uqlbh kz dr0 do au26:ons in the ropes are 50 N, what is the mass of the traffickqu2 lh u-rvaz:1ddtbe6, o0 , light?

  Two boxes of masses m and 2m are in contact s(71 kdtqb(tk,yz35fmrwa/ m vfj):lwith each other on a frictionless surface. (See wyj zm7,(5 b(qmt1fr)fvdsl 3k /k:atFig. 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 frictionld/q *ynk1.btbtw 79sness surface. (See Fig. 4-3.) 1ts b79 wk nyd*t.nqb/What is the net force on the more massive box?

  Two boxes of masses m and 2m a*z r17k110zuxylkuvr re connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what iuyvz71u0rrlx1z1 *k ks the tension in the connecting rope?

  Two boxes of masses m andd*hhe ;tr*mlr 7axd2 +2edhl6 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massivehah*rrh2de *2llt; 6m+ xdd7e box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pullfik(x9i6l(v yey as shown in Fig. 4-5. Bo 6ky fxilv((9ix 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 )/cr.r:yui bh between a 3.0-kg box and a desk are 0.40 u:/cr.ry hb)i 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 and kivt -aub+p(8 h2qpp2dunetic frictions for plastic on wood are 0.50 and 0bp u2td(2hp +u8a q-pv.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.0fi;7mbigfllq 2iu0;r/ *apc It slows and comes to a stop with a constant acceleratio2c r7;ai0/lqfp; m iufbl0* gin 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 surfaw b 9vz*3b(wjrl(t (ctce is pulled by a 5.0-N force. A 3.0-N friction force r(vb*zljbrw( 9 t tc(3wetards 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 a rate ndal.z-/p tb2ir .zi ,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 gbo.r(jb l)-o initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of j ( ogbr-l.o)bkinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police findche8 .hv wz-u4qw4js, 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 cond8wh44ejq-z, vwshc.u itions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See hhdnmo+j7 /c0k6qc- b pma)-oFig. 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 static frichb0- )mcm +ojdp-ak/ no6c7hqtion force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface b50m d/xqx5gwno 1r:o ketween the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less masskq ox5/1r0 mxwgdo5: nive 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 plane. The yycx3g )z18wcplane is inclined at an angl ycc1xwyg38 )ze of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dwe /ge h lxjfoo+e67n21req .raf 1x/-3 ,hlltown 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 plakq m,yrihhgo0 o2nxj 3cp/)w-y b )n9-ne with 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 ar; 1z.e imcrkezr1:0wt 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 ppz 0s e m112ifxvbp:b8lane, at a constant velocity of 6.0 m/0pbfsm28:1zpbexi v 1s.
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 rouggxmq.lcg ja.dei 0l2tp 2x1bg80k+0 uh $37^{\circ}$ 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 dopo6xx 0c,cz2w wn 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 surface. The cable: c)8v*yz8v p8gqurmx attached to thprzv8g:c*mvxu) y8q 8e 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 rek:7c h5fzp3t bst on a rough inclined plane tilted at an angle of f 5ct3kh7zp:b $33.5^{\circ}$ 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. Tk. mckp4twxb552 ,jrlhe angle of incline is gradually increased until the object begins t jl5,t.5w2bmr pckxk4o slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?