Which of Newton's laws best explains why motorists should buqgw5mc.) *,tr, eedyjckle-up?

  When you sit on a chair, the resultan;qn vc+nqohpu7uc8,6p k w )*f1vp,kyt force on you is

  In the absence of an external force, a moving object wilpq 8.tw2k 9kena+i (ngl

  When the rocket engines on the starship NO-PAIN-NO-GAIN are s9df* lza.b ixy 3t0y5tuddenly turned off, while traveling in elf a 93yt5y*0tdx ib.zmpty space, the starship will

  A rocket moves through empty spac6q 6mtxn ds6vx6ask4;e in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force thvxtn;s6x6kd q46am 6sat must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you7* cz +g8w:12eo 7fj vhx9rm/glddcp u suddenly fall forward. You can8 pm 7/ d7vuc9 1rgcfhzx g2dje:*wl+o imply from this that the bus's

  You are standing in a moving bus, facing forward, and y.;mf1pg ,ob ieou suddenly fall forward as the bus comes to an immef 1b ,mo.epi;gdiate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describ,b rbw bg/+i cc kzi1l+3j5yp)e the motion of the object.

  The acceleration of an obje5+rfbp/t i.q. vz;wzfi2+ri mct is inversely proportional to

  A net force F accelerates a mass m w8h: xvt5ize(lith an acceleration a. If the same net force is applied to mass 2m, then the acceleratio8h5vtz:xel (in will be

  A net force F acts on a mass m and produces an acceleration a. 1fs- 6 qeakpdrc 9r++a What acceleration results if a net force 2sfak+repqdr96-1a + cF acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. This p 7czvf +sru;8is c;87vzfups +ran illustration of

  Two cars collide head-on. At every moment during the col0j(-d8hsz3 fan 2w)f fgaldv 4lision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This isfs8wzd fna0 a2g4jv fd)l(- 3h an example of

  If you exert a force F on an yp f)-m1i 5mnhzhz;ath. .pj/object, the force which the object exerts on you wip z.-51f); a/imm jphhty hnz.ll

  Action-reaction forc*.ac v11m 85pv.ypufj-ck zl mes

  Action-reaction forces f-ehp+ n/jkq:are

  A 20-ton truck collides with a 1500-lb caz6q+f+p in c.y.p b9gzr and causes a lot of damage to the car. Since a lot of damag9+.zpf6+ qn byiz.cgpe is done on the car

  An object of mass m sits on a flat table. The Earth pulls on d:d toy/h4ta::zk8j:kt0c2d tc sy 0m this object with force mg, which we will call the action force. What is the rea2 hy8 4:dottk:d: s zmcky:0c0jdtat/ction force?

  A child's toy is suspended from the pz +v c9:vx t5p./gxflceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. Iff pzv:+pl v.gtc/5 x9x this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched ptlee( f.(y bag;tabu1t/ m+6dk g+r*to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous fo fe u6a gb ;tl.(b+ kyga*dtt+1p(rme/rce, whose magnitude is

State Newton's three se u o7qhy/r,;laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on v4z54gk; o;:8mr sewolhdl 2f:kco /cEarth. Which of th;c/g;e 2 zo:8m 5 4khlk4lf oosvrd:wce following is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whig6o8f/lifz x 7ch acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a p.jd c*69y qiaierson weighing qci dy9.a*ij6600 N?

  A stone is thrown straight up. At, 5 zcii*cnc*obmh76ur)bi (v4t)3lbaxlg c9 the top of its path, the net force acting on it ic 3*7l,cihirtb )mx)uc 5 i9alvz b 4bco*(g6ns

  A 20-N weight and a 5.0-N weight are dropped simultaneously from th .9)c uum0rl9znp9h:ej 0xprl e same height. Ignore air resistanc9) l0cxh:jnzl um.upp9 9rer0e. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal vss e7yv: ac0c0s- /yy* mt)zbrelocities. Which object experiences the greater force of a/*ycmczyrsst0-:b 7a v y)se0 ir friction?

  An object of mass m is hanging by a string from the ceudh;:o(l l ,g l2l -k4l0iwj8o.gelvkiling of an elevator. The elevator is movio.gi lh4 8 j0leg ulo2:wll,k(v; kdl-ng up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling s +wc2 xgr*;xxof an elevator. The elevator is moving upward, but slowing down. What w*r s+ xxg;2cxis the tension in the string?

  The force that keeps ydg m.y/x4c0j 1h)j)g51zt dcp (unbfws v/, inou from sliding on an icy sidewalk is

  It's more difficult to start movinjg jkhou wvtert,q,2sn;u98t3y4 ( 2og a heavy carton from rest than it is to keep pushing it with constant v o,o,k trjye2ju93h v82 (s nt4w;utgqelocity, because

  A horizontal force accelerates a box from rest across a hof yk 0h0wq6odc x*-9 4jjbbf:crizontal surface (friction is present) at a constant rate. The experiment is 0*j40w6q9 bdjbcoh c -f fx:kyrepeated, 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 velocity. Thu5zt26p *sidg-og iz -ls we can deduce -zo l2 6gtpi*zsg -d5ithat

  A block of mass M slides down a frictionless plane inclined at an /5 yis9qhoy5k angle q with the horizontal. The normal reaction /iysy59h qo5k force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angljep7r vod*-3g e q with the horizoj r7pvd oge3*-ntal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides dowtxq/-fay j 0w+n a frictionless plane inclined at an angle q with the horizontal. The grw0/fq+xj-ay t avitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneo4cw he 8.7xiyh1woz2t usly on an inclined plane that makes an ac.e8iz wtohxw 71y42hngle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. Abf,+ boc 193 4qsfmbhh 16-N force is applied to the object, and it accelerates at 3o+c,1 4hbfqbm fbs 9h$2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can a6w5 tj/mx eys,z:x,f tccelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the car? t,6x/ ,wjfext s5z:my

  Starting from rest, a 4.0-kg body rv 2d7v/z:llpgv *jmu/eaches a speed of 8.0 m/s in 2.0 s. What is the net force actl j*v:zp v2/lmd7/vug ing on the body?

  An antitank weapon fqic5wtypu6mgi:7 / (j+wz9 bhires a 3.00-kg rocket which acquires a speed of 50.0 m/s after ptiuwm wc75(yqihg9+j/ 6zb :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 t2 * kldwdc6v.;xend p-he same force that you push a 10-kg mass from restd k.npv; 6edw-*x2cd l,

  What is the mass of a person :vai iz23/xzcjmd0. vwho weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Eao2y4 6 bxr xg7zyzg4)prth where the acceleration due to gravity is pzygozx4b)4r 7y62 g x$9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Ebh*8/b6kzx 6m(xwtdj arth. What is the mass of the object on the surface of the Moon where the acceleration duez( kbx xd* h86mb6w/tj 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 j4vg0i)u 6q vsps )2zlMoon. The Moon's gravity is one sixth of Earth's. Compare the masses of the obje4sv 0vsq) ujpg)l62iz cts.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5*,v9wvnd7h ewt(l-dj z8dt,zvdj 1t 9 .0-kg rope. Sue pdw,t- d, 9jj(971 l8evdnv dttwhzz*v ulls with 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 :3etx.zkw6,ugmn/kum 6id +)2 n(nodev .cma level frictionless surface. A force F acts on the sta a nm ux2 ,.t)n./om ku6w+dzmin:kv6e3gd c(eck, 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. asxwxce1e.h)y it( je0p/c w; z-(au -What will the scale be reading when the elevator isz)x( h.jcewa;- /ea- cwxye (sip1t0u accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If tvjpg7yhf*.s6 / y/,gr31d c t u)inoeehe mass of the person is 60.0 kg and the elevator aghtrf 31yc7*y.ie gn//u dpo)e6v j ,sccelerates 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 n5.)rhjsoc 6ielevator. If the mass of the person is 60.0 kg jsonr6).i hc5and the elevator 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-kajq4 tkvu-p0- d,sz ng84 3quag 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. Whaj-pa4uq8dzsakq0g 4n, -u vt 3t is the acceleration of the mass?

  An object of mass 6000 kg rests on(ai 9 2/qa bbo usys+h/cu6g)vmib.k0 the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the baib0mca6v skq (/y/ g9o+buuh2s).itruck is 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 6000bzu1ze y6cez .0fb:* a kg rests on the 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, what is the minimum stopping time if1* eb afe:z.zzb60 ucy 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, what in,l.kem vyt7r 7*j a0gs th at k,v7.70nejrl*m gye magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if Mc 1sb hof.ge96 = 0.60 kg and m = 0.40 kg, what is the tension in the string? (o19hg sfce.6 bIgnore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizoj kki0oq 3:(lkntal floor with a force of 100 N in a direct k0qo 3:li(jkkion 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 flo tb vg,g3apwz/mn3+g2or 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 normal force on the bo3zaw/pmgv,ng 32 gtb+x?

  A traffic light of weight 100 N is supporte *r)p+98 /zlkcvu v(ovt7sgmid by two ropes as shown in Fig. 4-2. What are the tensitv c m v78orzku l/vg9)+(isp*ons in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what7y8w y/vksg8 r8 h vf,qeu3v2f is the mass of the trafficfyv8 gr vwv/,87 yhf8kqe32us light?

  Two boxes of masses m and 2m are in cont 0wfofql *jpgr0 ,20vs* ozsq8act with each other on a frictionless surface. (See Fig. 4-3.) What is the acceloqqf sz0 2*08vpojg, w*0s rfleration of the more massive box?

  Two boxes of masses m and 2m are in contact with hdzot87 vf ic-3q )u6teach other on a frictionless surface. 6cvhidu8 tqz7) to-3f (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connc +gkm960i wdnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the coginc k6 0+m9dwnnecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4pt0 ciujb9.g+.(:y c0w zvw vc-4.) If the forward force on the more massive box is F, what is the acceleration of the less massiv0+bcu: tw .pyj0vccg.w9iz(ve box?

Two boxes are connected by a cord running over)aurkh k s:1lud: 5.fr a pulley as shown in Fig. 4-5. Box I of mh 1.)u :lukrsfadr5k :ass
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 box and2d fnz s-rmoqy1w4 m(0.a h1lr a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is appliem -ywmaz12 1l04rs(.qrnodhf d to the box?

  The coefficients of static and kinetic frictions for plastib1 3w,olnf4 3bcgu iemgw*c5+ c on wood are 0.50 and 0.4b31f,mo g3c4 n+wgeiwl *c bu50,
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. I,u91wg ;pvjshzve r.(t slows and comes to a stop with a constant accjg.,ve s(vh; ru9wp1zeleration 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 surfa0/8u0t- pcy y(qp g7u,,pvy*mcelnsyce is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the q/ce0lcn7s -0*up,v y guptp8y(y,ym acceleration of the object?

  A horizontal force of 5.0 N ao3u umd0t rc,8ccelerates 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 initial speed of 10 m/s. It iauu63pyi ,( qslides 50 m on the ice before it stops ,ipu y6(a3iqu. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigationvog.9dhg4e go0ks 2rd 9njq/l: 4w4d z of a traffic accident, police find skid marks 90.0 m long. They determine the coefficieno.dl9jvwde d ggh:0/os 244q4r zgkn9t 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 stacked. (See Fig. 4-6.) The surface bet37*b+4gji .vwlqs fqgween the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does notfg.jli+7w qgs 3v*b q4 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. (Se+ e ggfcvgi n-5o/;:jee 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 coeffici+fn5j/ ec ogg- ie;v:gent of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined at ansjxeai m9ob)( yuar664-t1m e angle of 6j 1 ax)r m9e4auteb(osi-m6y$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a f 9-uxjv)kh.y60kk t nilat 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 plane with an ang/cr;q ,va1ka5 hxo:uy le 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 a3b33qsf *lufpn 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 constant veloc: nfira-pdr :,ity of 6.0:rn i f:dr-a,p 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 slide(-,c. ekioms l 5al6sls 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 roub:4 ojj- v;kwogh $37^{\circ}$ 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 ap)9d nnfi cj6z/;hq 8w75 el0fcoi(bk rough surface. The cable attached to the log makesife5jzfi )ncd8/7; p l0 nwbq(ockh96 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 a rough inclined plane tilted at an anglb*oog, 7:e htse hgot,esb* o7: 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 graduv* :uqb )q9+z lv(aylnally increased until the object begins to slide. The angle at which :*( u+zvaql9lvyqb n )this occurs is q. What is the coefficient of static friction between the object and the plane?