Which of Newton's laws best explains why mo8bu8zx 7 uc;)g3ppl oatorists should buckle-up?

  When you sit on a chair, the resultant force on you i5* p ,hejh02vron x;dws

  In the absence of an external force, a5e4(v,cn7b axo b lhnkaj)d+, moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAINtmv9zyc/eq(u 1 (b6kc are suddenly turned off, while traveling(q1t /6ycvb(zckmu e9 in empty space, the starship will

  A rocket moves through empty space in a straight li4xypv3xdtwq )k(fc9/ne with constant speed. It is far from the4()3 xyp/9 qt cfdwvxk gravitational 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 fall forwarruofg91n .7r m*ul3 wd bgnq6ek/41owul/7xgd. You can imply from this that kfb6guwg9/4*nu/d7lu3roqg1w x7 .le r1 nmothe bus's

  You are standing in a movin c3 bmfs/7q8e.bgnf- pg bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to falb7 b.- pqn esm/3fc8gfl forward?

  A constant net force actsu-xfiw,gq; 2 -1wnp2i wl7fdg on an object. Describe the motion of the object.

  The acceleration of an object is inversely pro g ecsvjo4/ 4b)*rzo l+/1pnieportional to

  A net force F acceleratec f8mvvn5hufcq0.)eg 7 5 czvn).5mu ks a mass m with an acceleration a. If the same net force is applied to mass 2m, theecquugh75 )nc m5z8.5k fmnv 0.)vvcf n the acceleration will be

  A net force F acts on a mass m and produces an accermsz+1i q0 9u;ae1bm3nv lw8s leration a. What acceleration results if a net force 2F acts1zr n8a+bmlq v s1iw 9u0me;s3 on mass 4m?

  If you blow up a balloon, and then release it, the balloon wi cq6x:.io9oc;twjfkqd4( ssr a1 h:.zll fly away. This is an illustrathk w6.4d(aof :.91rtoszcix:qsj cq ;ion of

  Two cars collide head-on. At every moment during the collision, ty3k f*bqt++ olpru elm8xk)1; he magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the for*lq13rmk ;x+e okytpfulb8+) ce 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 otwukra w,s f,(-3agc k 0fc.g,bject exerts on you wia wgk,-ks0,u.aw,frft g cc( 3ll

  Action-reaction forcbbf o8s8 w01nges

  Action-reaction forces ar. w2gjok fi20se

  A 20-ton truck collides with a 1500-lb car a 7zmrm6smzn -4nd causes a lot of damage to the car. Since a lot of dz-76 znmm4rsmamage is done on the car

  An object of mass m sits on a fla- g /knmq/aq5bf q4ny;t table. The Earth pulls on this object with force mg, which we will cal4 q;ga /mf k/5nnybqq-l the action force. What is the reaction force?

  A child's toy is suspended from the ceiling byg acw*w y:o6g2 means of a string. The Earth pulls downward on the toy with its weag:w*y26co gw ight 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 bo:u lpwu+ k cjm6k2 y:m9lj/t(all hits the bat with an instantaneous force, whose:6t( jukm yjlk /wp cm+2:9uol magnitude is

State Newton's three lawi kn*lqz2oj*9s.

  Mass and weight

  The acceleration due to gravity is lower on the Moon t)s r-.znbl1htn: l-qrhan on Earth. Which of the following is true about the mal -nsl.b :h1r-trzqn)ss and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a fg7kg 9f,a4nixgp 1v3distance is

  Who has a greater weight to mass ratio, a person weighing 400 Nzoae.8; 85m5rrnha yh or a person weigh ;mro8 5h5h anyazr8.eing 600 N?

  A stone is thrown straight up. At the top of its p46ttd(wcwj d 0mwkh 5 p2l-z)fath, the net force acting on it isfj -c)hz5pt(wl mddtw 620k w4

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same hp 9gb+cn uaoy:3n 0ue5eight. Ignore air resistance. Compare0 g c3 pny59neobua+u: their accelerations.

  A brick and a feather fall to the earth at their respective t67.x3vt ria bzj 9xe-ferminal velocities. Which object experiences the greater fo xb.ije-trv ax76f9 3zrce of air friction?

  An object of mass m is hanging by a string from ,gd h: as*ezw-ct12pk the ceiling of an elevator. The elevator is mw- *,tp:h2sd 1agzck eoving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an el-btgvt,w d+ 4kevator. The elevator is moving upward, but slowing down. What is the tension in the gkt4- ,dbtv+ wstring?

  The force that keeps you from slihnq/tjxz0 br0a 3 )1mdding on an icy sidewalk is

  It's more difficult to start mova ys9ot.pe8 t. gl7lv(ing a heavy carton from rest than it is to keep pushin9s8tl.eo pl7(yt .avg g it with constant velocity, because

  A horizontal force accelerates a box from rest aifxyd 7v,ip.; cross a horizontal surface (friction is present) at a constant dfy vix,7.;ip 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 velocit4qqcb0e9xi3zhk (gfm b1(qb0y. Thus we can dedu01z i bbkqxhq9q c(gmf34(b0ece that

  A block of mass M slides down a frictionless plane incl, puv/j 2 4silgazt55ained at an angle q with the horizontal. The normal reaction force exeapvt/zga4 2 5lju ,is5rted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle qrtgh-hi qi/ efr,/(m ) with the horizontal. The normal reaction force exerted by the plane on ir/ /me,(h)tifgrqh- the block is directed

  A block of mass M slides down a frictionless plane inclined at anaqnjnqw. : 5 w.,j1blg angle q with the horizontal. The gravitational force is direct 1an5,gj..w ljqwnb q:ed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclinvf68bzqtcb k*ry :7c9uy 1wq4 ed plane that makes an angle of 30e with the horikcr4*v:69 8bc1 7 zfyyubwqt qzontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied tb4xn,)0)yqn 9kjrhr l7gkyf ( o the object, and it)x jb,l9krny4y 7k0hr f)q g(n 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 sovhw4pzlk+1og + ob,sgsu;:*. What is the *gol+w 4, op:ogsbsk z;1+vhu average forward force on the car?

  Starting from rest, a ,ek fjsb v 7kx7ai;.f lt:3jh74.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the bk7sthfka , .be7jixj l7v;3f:ody?

  An antitank weapon fires a 3.0zrd( fi -7 )(k;7 ;0 ewhwxbuhtsnld6m0-kg rocket which acquires a speed of 50.0 m/s after t7-;u7( nh sw)dmhl0z(ikbtw drf6ex; raveling
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 10-kg mass fro7 vyx pc/7o(j.xoxo3gm restx7c7.y/ g3j (voxoxop ,

  What is the mass of a person who 7p81o 3 l9 oqui7(jpbhdylrh/weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface wh. cqu2z/5uojk ,1afof the Earth where the accelecuuo zj2wq ./5ak,hf1ration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the maszlzo1amm qu s 3j.23( qxg/ho1s of the object on the surface of the Moon where the acceleration due to gravity i z 2sqlx31m .(hoqg/jaz 3mo1us only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B adq5iduyt 1)4kh/:cu weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the mass /h 1d:5u4utkqydcia)es of the objects.

  Sue and Sean are having a tug-of-war by pulling oww 3iuh )3oj39dmmi um,)jtf0n opposite ends of a 5.0-kg rope. Sue pulls with wmuwmi0jd))h 9omu3 3f,j3it 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 frictionless surfacea; .voyrg qm1). A force F acts on the stack, and it accelorv q)1gy.m a;erates 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 b3g8 14m:ufsb2:go6oq fxj jje 6hf3wN stands on a scale in an elevator. What will the scale be r68u 31f oqfb:mj:3j26jfsbheo4 gwgx eading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person ib2p d,(ynu s;rjd w*.is 60.0 kg and the elevator accelerates downward with an acceleration of ;dw,y (*usbr.p2nj di$4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the perhi6,6n m o7rdfson is 60.0 kg and the elevator acceleratrhno6 i6mfd7 ,es upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forcesce+jcrj2 o.p9 9;vzh5 i(qgjh act on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What2hr9 ;vc.5opjqce h(j+gjzi9 is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is hc)2d ve em4 xalz9pb4(eld 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 is not to slide forwaex2)4d z(l4b acvmpe9rd into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. Isd4ze6j4r5z v t 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 stopping time if the load is not to slide forward into the cab? 4rez5zsd j46v

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m =.43x3u fzu x ;2ek pxngtk; /hlkf:in0 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore fric 2el 0f3/kkigxpnu;u.hft3: xnk4zx;tion and the mass of the pulley.)

  In the Atwood machine shown in r f6vpj of7*eroboim+g1 x5*)Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the massrffoj6og 7*+b rp*vi)e 1 ox5m of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force of 100;j bk;d7o12uxpoee/2c 4xf*9m tvdik t2xxx. N in a di 7/9 bm*x2e2.kfuc2xpd1ot j; t ixo;v kxe4dxrection 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 wie /pa j91;y r:tosk8w *lomfx;th 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 nooo m; fl8k wrsa:y*/19txjp e;rmal force on the box?

  A traffic light of weight 100 N is supported by two ropes as er)gk4 dtf rrqbh cuf33: 8;eut06,v cshown in Fig. 4-2. What are the tensions in,h k)3v3c06r4 eurffcrd qet8bg: ;tu the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what isi 5obb;t5qn:*m ds rr) the mass of the traffic light?;rb:d5t)qobi5 ms n r*

  Two boxes of masses m aj cqot46sy n2- 1sfh bga:-3bwnd 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more mat1gfsoaw4s2 b 3hy 6-b:- qcjnssive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless v6uki blgy/;yhu-;e.fnp v*o/hr 7 yg/2 fnn 8surface. (See Fig. 4-3.) ;gf2v-6 ren;h/7nbl nhy/ o iv/y8yuugp.*k fWhat is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a ig m fi(e/k(nh1whrm31m8ig4 rope. (See Fig. 4-4.) If the forward force on the more1fwimg i1ki mhr3/84 nm( eh(g massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 28 /ds fpfp*rm-m are connected by a rope. (See Fig. 4-4.) If the forward force on -r p/psd8mf *fthe more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a 8:nvu9 +q/kwb nafc5:f-rpg k cord running over a pulley as shown in Fig. 4-5. Bvfa9 pnwrcq-nk:/kfu +5: g 8box 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 h3. rd(qctb2fbetween 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 horizontftq2dr .h (b3cal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood a1w k.p.hmv 3m s+ozd: vxp;tg;re 0.50 and .pp kv1;z :gmow3ht .s+dx;vm0.40,
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. It slows and7khab.r8km vs-/- w09ufdl ef comes to a stop wit9slfe-h -krvwu78k fbm/ 0.d ah a constant 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 pulled by a 5.0-N force. A 3.0-)9 2. ooqkiv8za:o rv+ .aidfwN friction force retards the motion. What is the acceleration+ikd2i o9.z wqrf):o8 o .avav of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rater vjnieitlpgd+w +ach ,gt+. c)1(n 6; 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 initial spefaxr *a*v 9c5u y:+vcaed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction betwe9crvu5 y*+va:fc a a*xen the puck and the ice?

  During the investigation of a traffic acc r vk* npudlo ufv)j6.hk1.4u7ident, 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 th) 1ku4nu 6fjvd.. 7lrvuo*phke car when the brakes were applied.

  Two boxes of masses m and 3m are s5sncfd7 dl1jg (ww) iq , m:mhlmugf+**1xm,ytacked. (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 massw:ynm5gf cd1*lj,qu(w* + m,l)mhx fs17d i gmive 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 surface be ykx,gg;l,7.olx yh:t a6ri8 j, hhcs:tween the more massive box and the horizontal surface is smooth and the surface betsg6:, 8tx, yahr.,; olh xiygk c:7ljhween 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 is ,fz8))ha:ge;k wddr8p mq9dk inclined at an angle: 8 e )fq9k,zmwgaph;dr)k8 dd of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makese 28rw6)oddqa 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 iku2z+ (a3y ibfxp ow.:nclined plane 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 a8q:wru -) kgjqpe8:y ft 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 conxmy ur44 qc )yrnnqto0a;2 35fstant velocity of 6.0 nqyc5nt2r3r4 xm 4f;a)y 0 qoum/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 dow-6a3u d-js owrn 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 mq2 /xqy hb8:ga slides down 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 attap +885 9 2vnmzubampclched to the log8mlpbpv u 582anz 9m+c 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 k:agke2*awng6k l-qlg - - fl,a rough inclined plane tilted at an angle of ,: l nle-6 gq k*g2k-awlkfg-a$33.5^{\circ}$ 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 .vb dy0qpnr+ *lxwq :db3p)z 6gradually increased until the object begins to slindv zbl*x6py rd30+b .qw:)qpde. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?