Which of Newton's laws be gr;3q. meiv7zst explains why motorists should buckle-up?

  When you sit on a chair,gok,x ,nibr;. the resultant force on you is

  In the absence of an external force, a moviha4 :iv3 +mb(box5dqt ng object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned sb n z*cg9h* g diw*n9- peny/af,o7:boff, while traveling in empty space, the starship w* cn- ,h/ p*9way:7*gzefnsi9obb gndill

  A rocket moves through empty space in a stra2 dqzlk7 u2h(9kmoji 4ight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sus 7m4dzq92hi u( kjlko2tain its motion is

  You are standing in a moving bus, facing for9iwhy/66s /eg6( wipqb8s cpuward, and you suddenly fall forward. You can imp ge/86syqw9 ic66p ipbw su/(hly from this that the bus's

  You are standing in a moving bus, facing9;y)eo,r4f 8vok,jn ,vapi th forward, and you suddenly fall forward as the bus comes to an immediate stop. ;n9rhe ,, a t4f8,o yvoikpvj)What force caused you to fall forward?

  A constant net force acts on an object. Descrih*, ghy97 c rf2sj3vmqbe the motion of the object.

  The acceleration of an object is inven, h4dnhk0s **njzb +o ljmpy jmx,; aoc83.b1rsely proportional to

  A net force F accelerates a ma7u k +/kkf9w.ljav s*lss m with an acceleration a. If the same net force is applied to mass 2m, then the acjuwkal/k*+fls7k9 . v celeration will be

  A net force F acts on a mass m and produces an acceleration a. Wf*x(l z28 ifuzw1 hby ,cn4xi0hat acceleration resultswn1xf, ix8yfb0iz zc* l24h( u if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will flp1-s ) mjfho0iy away. This is an ij sf )1ph-moi0llustration of

  Two cars collide head-on. At every moment during the collision, the magnitu: 9onuv0 ysc71xk./j7ek(z0avxwz t w de of the force 1kzv.c0nao w77e 9xt:xwuzy (js0 kv/ the first car exerts 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 wh+vl3,oo,1hh z;yo32v amqb h4+hwz rfich the object exerts on you willha+o2hyvhf +,h 4mzq3ob3v ,ozr1l; w

  Action-reaction forczc *,n880yigk((4qkf)et ptpr ta u-ues

  Action-reaction forces agi x)ksrlwv-u9 ht,4ow6 y-d 9re

  A 20-ton truck collides with a 1500-lb car and causes a lotck9b8w8 zg 2um of damage to the car. Since a lot of d9mk8c u2wb8 gzamage is done on the car

  An object of mass m sits on a flat table. The Earth pullsh up4w9o l0 h*t)s4mme on this object with force mg, which we will call the action force. What is tlus0 49e4mhph*mw)t o he reaction force?

  A child's toy is suspey 4)k qu:q..nffin +eicdk) (qnded from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this.fk ku(4nnc:+q yqq))if e. id is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500 ire4i gupv(x82)z1 oi-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitui(8)x v p2ouz1 reig4ide is

State Newton's three lawt5xqt 8 9ksza0xv b ;64vartl2s.

  Mass and weight

  The acceleration due to gravity is lower on the Moon tl92- k:tl6e jeai7 4 xxq 2itvsd7g-azhan on Earth. Which of the following is true about the mass and weight of an astronaut on the Mod-g7z2i4aqtk-j29x7sile a e6 t: lxv on's surface, compared to Earth?

  An example of a force which acts at a dis fmxyq8p9:v 2n/lv4ei tance is

  Who has a greater weight to mass ratio, a peraxwascs 2tw*rf43o,y0tr ; 6uson weighing 400 N or a person weighi,o3ra6w *t0x 42rcy;twsf ua sng 600 N?

  A stone is thrown straight up. At the top of its path, the net force l2vqv-g+uas+ acting on it v2l g-uvs+ +qais

  A 20-N weight and a 5.0-N weight are dropped si d)q2ko bpc;m20.hq8o xl7qfimultaneously from the same height. Igok2cq o2 h7d fq q);m.0bl8pxinore air resistance. Compare their accelerations.

  A brick and a feather fall to th4:*u)yn fpcev zr9t.he earth at their respective terminal velocities. Which object experiences the greater force of aie y.9zvctr):4n*hf u pr friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. The0b 6 tjioho;8p elevator is moving up at constant speed. What is the tension in the string?8joi6pb0; ho t

  An object of mass m is hanging by a*vsr66 y v+e6ybfmao6 string from the ceiling of an elevator. The elevator is moving upward, but slowing down. Wh 6sebv 6arym6o+6* yvfat is the tension in the string?

  The force that keeps you from sliding on an 51ylx8r rxo b3w t)xmo n5q4d0icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is t-(.ne xdp v94ev07nd+af nfosesx0x.o keep pushing it with ds. enf df v0 xxe0ve9+7n-ns.a oxp4(constant velocity, because

  A horizontal force accelerates a box from w l*m;1yg7b,u z l8c76 fxtiijrest across a horizontal surface (friction igijt l81z,7 f*w7y ;x6bmciu ls 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 acceleration?

  A packing crate slides down an inclined ramp at constant velkm6qp8jhdvn vjm,*qm 4*)zzfuwoi8 * 3 v y8.aocity. Thus we can deduce qajd* .43ihoj* 8vp u)8ym w,*zkmfvnmzvq 86 that

  A block of mass M slid2qxkva 0y.p emw6z9h2 es down a frictionless plane inclined at an angle q with thehmyz2xk9 pvq.6wa 0 e2 horizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane u h*vtge9 zh,mj(z32s tp1qdu bbq9(*inclined at an angle q with the horizontal. The normal reaction f,q9(jv*buu9 t h tzp1s2 h3qbdmz g(*eorce exerted by the plane on the block is directed

  A block of mass M slides 0ncju tc:6v09uy bi,ldown a frictionless plane inclined at an angle q with the horizontal. The gravitational force is directc60unjbtylcu09 : iv, ed

  Two toy cars (16 kg and 2.0 kg) are released m5: r9g1ru,s ogd f9ye;t)zi muf*sm )simultaneously on an inclined plane that makes an angle of 30f5 uo*t ,u1ir;rg 9m)ssgmm f)d9ez:ye with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surdx, i u/dctogr795kt*face. A 16-N force is applied to the object, and it act dg ir9*xotc/5duk,7celerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1 s05bzw 9ihzo,9agts 47s y c*tw,4gkl000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the car?,t 0zgogb,4w7stw4l9i k*zsay9 cs 5 h

  Starting from rest, a 4.0-kg body reaches a spz,p5wmh *y+7dqk 4g r*6eao9m2c n ujseed of 8.0 m/s in 2.0 s. What is the net force 5e mcwq9 ,k2*pnr*+oy6haz gusj 74dm acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s afu0- vch: h0 5pg;why ysjak52ft-ku52hps jha00y 5: yfvc hgw;er 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 sam0s.az 6d8rn8uxgaj3 we force that you push a 10-kg mass from res wsg8zu.jdn8 raa06 3xt,

  What is the mass of a z; wwa7wjwl45 person who weighs 110 lb?

  What is the mass of an object thab. 89t*axz.6kh byuqit weighs 250 N on the surface of the Earth wherzby. x9q *tia6 .kh8bue the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on)r h8ypvtcgj i0+*b) w/nb5a t the Earth. What is the mass of the object on the s)nrytj ct*gi/a 80 bv+p5 hbw)urface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on2ci,u(fa6 f vk Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earav,f2(kucf6 ith's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kx2b*q t e1nz iitmskuia93 k7 08ep7y5g rope. Sue pulls with 7en0t2s b yi pzm8ek9*5xq7uk1 iti3aa 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 surface. A force F actsoj5y- j w8si5yb(r38,cfwzu k on the stack, and it acceyjiskc8ywz,5-(fj ou8 wb 3 5rlerates 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 :ek2*de 7/cgi k3rdaha scale in an elevator. What will the scale rd h3:*eaek i/2dkcg7be reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If +slw5o)a+j cu the mass of the person is 60.0 kg and the elevator accelerates downwardwco + l5j+au)s with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ride6iqt qf);67 /8qtg qj7ptg 8ayc jjdp7s in an elevator. If the mass of the person is 60.0 kg and the elev tqgi77dqpy6tjta/76 )f ;8qjq gpc 8jator accelerates 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 ma hhr ehug7h74+ss. One force has a magnitude of 8.0 N and h7u h74h erg+his 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 rests on the flatbed of aodvr*f 1rt/flu;a(*+32di5bh ajcl y 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// +a*yda1rd3ff ;hv2lj*t5bcr(ilo us, what is the minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests oiq 7f- pj5)5kr4ntstg h3i i-yn the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Whenn 7i 3rf)i 5ysti-t5hk4jg- qp 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 *8q.) cd9wb1 h .9ct7eiw/tlj dw *wri os+nmhshown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleratio/ 9driodw+ 1.wte*cqhws 8jt 9bn h*).mc 7lwin of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine awpzx z r zi4;,2cdg 5zy:n 0b+seqg28g+wd4zshown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is +5qzwzszdp 2:w n42+ i0b,8g re4;ycaxd g zgzthe tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horh fm4 7:dlnv:cizontal floor with a force of 100 N in a direcvfd mlc ::74hntion 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 horhxuo1nh n:;;;unx7 pw izontal 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,;u;onp17 h;nn:uwh xx what is the normal force on the box?

  A traffic light of weight 100 N is supportedzl* 6vksabcc0((ro i/+2 afjv by two ropes as shown in Fig. 4-2. (zakc ( rl/vi f2c*+bvos 0j6aWhat are the tensions in the ropes?

  In Fig. 4-2, if the lac s 8n8-377xw/jv;krkekjktensions in the ropes are 50 N, what is the mass of the traffic lighrs/j 78v3e kxwk c8;kal-k 7jnt?

  Two boxes of masses m a3sn) vv +6 f 6v7s6rfogdqvow-nd 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acc- gv v6 vq6v6d7nsfoo)+s3rwf eleration of the more massive box?

  Two boxes of masses m and 2m are in contact w1) c sfbzstd-/ith each other on a frictionless surface. (See Fig. 4-3.) What is the net forc)-c1/d sftzsbe on the more massive box?

  Two boxes of masses q s4ptfa *6bc)m and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more mqs)6 fab*c t4passive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by am fdg-qnhrz*; z. u+tv 8dcj*h0d8 ob- rope. (See Fig. 4-4.) If the forward force on the more g*o fq-.j; nzdd hvchbdu+t0*z8m- r8 massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as st(on()n odnoi3e9 up2e jr 4w5hown in Fig. 4-5. Box I onjie(do34 u9eprn2o ow) 5tn(f 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 sa. a )kfppc79pt+.ani tatic and 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 horizontal force is applied to th9n. )+ckatap .pfipa7 e box?

  The coefficients of static and kinetic frictions fdgacxj sz),4z 7vhl c4: kt5-wor plastic on wood are 0.50 and 0.40,dvczls j)kg w4c-7z xa54h: ,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 +x direction. It slows rt*otxlm27/x8 l- naqand comes to a stop with a conrt*2nl -mo l7x8qt ax/stant 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 9x)4n9/ yd syjrmpt.sg, 94x gf,9g 0txtmpbasurface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the objec,99jtp9y4bg4s g0 nst xmx).dgx f9 tamyrp,/t?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at iwn3.h fb **4f8 df;wwbq4rqba 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 initial speed of 10 m/s. It slidf wr4m;dy,-baes 50 m on the ice before it stops. What -w a 4dbr;m,yfis the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.4of3klur/f,6 6ozo am0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prak fuf/o6z63moo r4l,evailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface b338ti0igl bf xetween the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less mai0lbf g 3x8ti3ssive 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 st46g w/vqtmr n)j,.ofq acked. (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 r) ,/.o4 vqngtf6wmj qthe coefficient of static friction between the boxes?

  An object is on a frictc*-t +i)la psuw+0.+in zyfmuionless inclined plane. The plane is inclined at an angle ol-ti + f w +m0a).pcnys*iuuz+f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mf.,flsp4ohvu 5vtlxo7 :a rg;n s42x;akes 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 +rf7z2 gai:mh 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 tij9:sts 97q7vwm px :lvlted 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 constu 2a8uby u)f:jpb w:;o-e so8rant velocity of 6.;)2: uwp b8:e baf-u rojsy8ou0 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 slsxb0 : 9o vn2yavdr 40pws8kry,+ qg0m; osh:pides 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 down a rough/8 /hz iblqs;u $37^{\circ}$ 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 alonuk 1f(zv,g3l-mxp6zng a rough surface. The cable attached to the log makes an an6up3 n1kvf-,lz x( zgmgle 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 f8 cx6 jp owb82u(()aix0injzpm lq.j9 rom rest on a rough inclined plane tilted at an angle ij2qn69wx j(po m )up(z .jlb ai088xcof $33.5^{\circ}$ 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. Thx 8 6;a7hx 7te -wriwkvf5k-ghe angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static fric8 -x7a;-xw7ivk tr6kwghhf e 5tion between the object and the plane?