Which of Newton's laws best explains why *o11, iet-9sb1 mlb2h sozowgmotorists should buckle-up?

  When you sit on a chair, the kdhei d *7:ku5.vw*-;wa wewlresultant force on you is

  In the absence of an externa)8ssbxv xwcd gh/ /,8m3e 1udil force, a moving object will

  When the rocket enginen n5xhp3a:zj 0kuc8 )ps on the starship NO-PAIN-NO-GAIN are suddenly turned off, while travenpzhnp x :85)u0 cj3akling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. qie/l0xm+;)i t b8xrd It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket ild/xi0)tr;i8 qbe+ m xn order to sustain its motion is

  You are standing in a moving bus, facing forward, 0gc+ 59onsc*e;l/ strj*8eg y hk1o ywand you suddenly fall forward. You can imply from this that the0s * 5t8y*k 1egh9cy;e+s/ognj lcwro bus's

  You are standing in a moving bus, fa e6 xv)yqvt43c q/4 4lpqx4,xbatb .wlcing forward, and you suddenly fall forward as the bus comes to a64pll4 q3bbycx,q).x /aw4tvv4xq te n immediate stop. What force caused you to fall forward?

  A constant net force tkbaoo w4axmr-1m n8u9+bi*+acts on an object. Describe the motion of the object.

  The acceleration of an object is inversely proportional ocb7txp)*mfd( ,gwt5 z, s1xm to

  A net force F accelerates a mass m with an acceleration a. If the /k.ivz2 r )eqssame net force is applied to q) 2/vsikrze. mass 2m, then the acceleration will be

  A net force F acts on a pg4idp6s 3afdiw23 9om fk;.a mass m and produces an acceleration a. What acceleration results if a netd 9o3mfis6w.4a23 p kfigpda; force 2F acts on mass 4m?

  If you blow up a balooa1 ft4u*so2 lhfxdiz2 k2xi5r 10z9loon, and then release it, the balloon will fly away. This is an illust u5x1a2zo4 *k92ofr z h1ft0idxso il2ration of

  Two cars collide head-on. At every moment during the collision,x0ciq)oa/kg c 2 mm53c6 1ketf the magnitude of the force the first car exerts on the sec02faxc/e 5q1kkt63mgcmci o)ond 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 you q prxxtp 8;j tyw7p -vsm;+*0hwil p t7xh*r;0-x;ppvym+w sjq t8l

  Action-reaction force 8v*uuz8htb w u0j0.tks

  Action-reaction forctuymaaaq93y 30 kgi39es are

  A 20-ton truck collides with a 1500-lb car and causes a lot of d2dc6t e:6c+*wat 2mt5pvjpqr5/et x ramage to the car. Since a lot of da22prept rjax+qc m6tte 55d6tcwv/ :*mage is done on the car

  An object of mass m 5+pgxk: wq)qlsits on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reactiw plqxq5k)g:+ on force?

  A child's toy is suspended from the ceiling by means of a string. The)m;j ery9mp2 n Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force9mp)e nm;j2r y"?

  Your bat hits the ball pitched to yo6tc wdwc9;c1u u with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose mag;1d9w6ccut wcnitude is

State Newton's three lawi)kogsh 0k45bs.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than ojst:q3xt c+x u g4p96j6ca0mf n Earth. Which of the following is true about the mass and weight o6pjctts4u m+:6xj 039 qcaf xgf an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts atlgdw4uekl + .- a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N )r(eni *k9*k / arlppnor a person weighp*nrrp(a) l9n k/iek*ing 600 N?

  A stone is thrown straight up. At the top of its path, tnx6uw /( /tgauj+xt1ehe net force acting on it is jue6+aw//1(x ungtxt

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same h-su l :p2um.:z tt0xwlq (bdy3eight. Ignore air resistanl yqm.w d3bl2u- z0t:xtu:p(sce. Compare their accelerations.

  A brick and a feather fall to the earth at their respective .mxp0dc+ 5ffjm 7ylih3 y .yv/terminal velocities. Which object experiencecv/0l.jyf.m 35hyyf +ix mdp 7s the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. The bfesl4ii 36n,:o o)xi elevator is moving up at consta)o,fxlbeo is4 3n ii6:nt speed. What is the tension in the string?

  An object of mass m is hanging by a string from the tss1a7fu zte5on 3,ry,:ki1 q ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension z,,k7 oaye13if15 :r ttnsuqsin the string?

  The force that keeps you from sliding ongk or*72:tk:sy z+d vp an icy sidewalk is

  It's more difficult to start mopybf4:vs r.bs,v5r; dn0-i y qving a heavy carton from rest than it is to keep pushing it with constant velocity, r .yvfbi, :s 54bvnrs-0d ;ypqbecause

  A horizontal force accelerates a box from rest across a hory(ug0asu mqe1 v3f9x4m0+g ooqls q97izontal surface (friction is present) at a constant rate. The experiment is repeated, andgm(m xfa40l9 + u1e3soqosyqq0v9u7g 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 constafs:r -l, 9nrj dkc)wsi 3o3cq6nt velocity. Thus we can de3 rs-fi96)s d3c,w kln:qr cjoduce that

  A block of mass M slides down a frictionles bt:r dh7nqlp2lm+ 8l,s plane inclined at an angle q with the hob+q7d2hnpt rl: ll, m8rizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides downde k6qs/rk0 yxt23 gu5 a frictionless plane inclined at an angle q with the horizontal. /eky5t3g0xu 26sr kd qThe normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down 7z3yb-j(b www 7kd6w (yrrkj-a frictionless plane inclined at an angle q with the horizontal.b(yrkw-6(y kd-73 w 7r wzbjwj The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are releasedp 8eedpo.)*f2 egh:z1mnhp d4 simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement dpf)ne4o2peh hd8.e *g1mz : pwhich best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied t : m**dssys09nll)nsxo the object,ss0*y9xs:dlln s* mn ) and 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/sf:( ejng3:p*yi ge7o i in 7.0 s. What is the an(ypgi*3o:7fe i:ej gverage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m*w yt.*i ,6e9 xjm6zvqymjfw1; 3hb iz/s in 2.0 s. What is the net force act6bm69hz f yizqw 1e;j.i*wmyj*xt,v3ing on the body?

  An antitank weapon fires a 3.00-kg rocbk dgi0)jw,n,x p :axo xi11yg(f:3+sl8lw pcket which acquires a speed of 50.0 m/s afterplg,wfnx:+x:1ibli(s ka,)w30o y j1 gdxp8c 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 pux:88ml- peugqsh a 10-kg mass from rest,-g u 8qeplx:8m

  What is the mass of a perpo/ ayy3-qta1 d8suori(x:3oson who weighs 110 lb?

  What is the mass of ajnbkhh2 m. d-:vb 1;t jga lvlrnlc..79/ler-n object that weighs 250 N on the surface of the Earth where the accelerb -9ktv rcvle .da.r12jlmn;ln/ gblh-.:h 7jation due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 47d ec;yg8yhyrn nmb)*+bss660 kg on the Earth. What is the mass of the object on the surfa;dy8sngbc 6y) 4mren +*hys7bce 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 object B weighs 40 N on tht mi4d5qw6-f ie Moon. The Moon's gravity is one sixth of Earth - imt45diqwf6's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-l71(r hmwp(oo(7 av1c ceoei2g3)rjk war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-Nwrr c(lm(aoeiojc2k g(7hve7p) o311 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 friction 0 vvqi t+d2ghd28jmi7less surface. A force F acts on the stavh2t+qv02j d mg7ii 8dck, 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. z 1pjd7*y: 4nyo1p npj What will the scale be reading when the elevator is acc:j y1*n71 j4ypopnzpdelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevq66 c wt.3 wi7etkhr)tator. If the mass of the person is 60.0 kg and the e)i7 tk63t6rhc.qwwt 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 the p qdzr7 ch7ciz(ny5*u:erson is 60.0 kg and the elevator accelerates upward with an acceleration iz7*rcnd7y(hqc u5z :of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces v.9.n p ub mdyb1i9 j:)pwr40l+jisgqact on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed du y+g1bju.iq4:0pb)sjw9. 9ndv m ilpre 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 rests on the flatbed of a tr*m.5+ yj4i o6dnkmd rk l7q)yr +f7makuck. 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, what is the minimum stopd5d+y 7k* .k) l n+mfiy jom47rm6raqkping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a tru7a)qpx 9e;q jh1 )iphsck. It is held in place by metal brackets that can exert a maximum horizontal fo ; 9p)es7ha)p1ijhxq qrce 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 ;sdt0qb+bn cu:jxq20in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Igno:qu;qn0jxcdb 0s bt2 +re friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if Mveh29v93a/ocfd - rect z+6hj = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and 9 aje2 eh9v/z3r-+ o6dhfccvt the mass of the pulley.)

  A student pulls a box of books on a smooem 3g3agn 7:a pzb2+2amx+8w abphm: ath horizontal floor with a force of 100 N in a direc am ag3hp232+b:a a8 gamepwmx: +nz7btion 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 bo)geuhc9 /eo s ;df4p8woks on a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the/ ed gofu9w)84;ec hps 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 shodnnj*)x1 usql m5sjt72cf; *uwn in Fig. 4-2. What are the tensions in *5flt;ujms n*s 7c1d) xu2qnjthe ropes?

  In Fig. 4-2, if the tensions in the rope: dnh*/x clj*xs are 50 N, what is the mass of the traff*hdjnxl :/c x*ic light?

  Two boxes of masses m and 2m are in contact with ealv e.xq2, 8/0f--lzfcosqels ch other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the mo qlfe -sq20-f.oe v s,x8lclz/re massive box?

  Two boxes of masses m and 2m are in contact with each other on 0z;jsl ye vy+49h9yyr);c zgr a frictionless surface. (See Fig. 4-3.) What is the net force on the more mylsj zeyg;v 0;y yrr)c+4hz99assive box?

  Two boxes of masses m and g/i3 ywzxg) 2sydl i632m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive d26zxlys3i)ggy3/wi 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-jelw9j5 g; 7sl)7ojpi 4.) If the forward force on the more massive box is F, what is thesj57glj9 7l we);oi pj acceleration of the less massive box?

Two boxes are connected by a co - cc7;rkj/ ewm4uy9gcs: xps5 c-)kknrd running over a pulley as shown in Fig. 4-5. Boxejy 4-;cgs-r5c7:k kwux)kms pncc9/ 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 a9vm7wa 8zgqtcs4n -8a7o 2-xyc zzg f*/w hm3snd kinetic frictions between 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 43zcs 8ox g fmgas9q-7z-nwcht w2 7 *mvay8/zhorizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.50x t, enfg 9vjt2 fb6.wi:h5j.ad1 :wls and 0.40 ,ag t12s fe5bx:h9w ljn: d.f6vjiw.t,
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 +x4duxn 9o5zw(vch7/ h5xp 4q qk direction. It slows and comes to a stop with a constant accenxow5v/hkdp(9hq47zcuq4 x 5 leration 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. qqxyalja47y tsdm p)f,4-1tcoa.+ x . A 3.0-N friction force retards the motion. W.)o7j myta aalp4 -q.1sdx y4,+xfq cthat is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg massx4 z/ksc 11ko gs5v0ng, 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 in53a hvzr + 2ejkbks9t vhl2-3(:jfnhhitial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient ofj3 kr :tvenabhh23+hkz hl s(f5 vj-29 kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid 0xatlawi * +glxfo /rxca:9+1marks 90.0 m long. They determine the coeffioa9++ ca1gi*/xlt :xx f wlr0acient 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 stack 2omj,79 bg+muhntuc1ed. (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 static friction force on th9uu o h27+,cmnb1t mgje less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The suk g;ig5ir v;ua68g doow2;wlb p);- svrface between the more massive box and the horizontal surfv buvi658wgwggo 2;d;- ;ps)l;ro a ikace 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 between the boxes?

  An object is on a frictionless inclined plane. The plane icg . +o/ln bwy p04lo1wnk-hn8dnw:;m s inclined at an angle o1 onc 8g:ykbhw .w4+ nnw /0lpod-nlm;f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill th0y 2vx;j)op ekat 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 wim+7r/f 4pdpv,h un*rq th 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 of 4 ; a/uhu kquek 55i;mp(vzf/g$35^{\circ}$ 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 azy1.brfo vf;c 1yeyy:g 0lh ., constant velocity of .ze 1b;yy0y.hvforl ,yf1gc: 6.0 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 llfcnaqt 282nesynvx 3+d/( kop:3 +srough $37^{\circ}$ 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 down pebig42bcl+c r r0 0;ka 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 caiv ,ei* o8vx92ciy9qbble attached to the log makes anqy *992,viivxo 8cibe 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 ) uvc.s rag09cinclined plane tilted at an angle0c9r.g)cvsa u 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 angle of incline is gra ybaqz+.n5g sc8r1h+ndually increased 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 r 1yb+.5 zqnags8+hncthe plane?