Which of Newton's laws best explains why motorists s,r4 k-gte,y1 7wwplsu 2 )kchzhould buckle-up?

  When you sit on a chair, the resultant force on you i5cy k:4rl;acwjpl l 7(s

  In the absence of an external force6vfc3.w4bqn:yl c52gme;gs eiu5) x q, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sud fq7o:kh+n:ji denly turned off, while traveling in empty space, :njhkqf i:o7+the starship will

  A rocket moves through empty space in a straight line with constant speeunpgngz )y8s(xt7, x(d. 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 sustain t gp xx8,7(ng)ysuz n(its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall foru9otnl2hst49c6nm jn ua-l 90 z* b1btward. You can imply frou n99t*j2ua th0 ot6cn 4zln1-bmlb 9sm this that the bus's

  You are standing in a moving bus, facing forwaron5 ou77q ot,dd, and you suddenly fall forward as the bus comes to q o7ud 5tono7,an immediate stop. What force caused you to fall forward?

  A constant net force actsge o 7)rm,bq u--9iph9 yo(dxe on an object. Describe the motion of the object.

  The acceleration of an object is inversely proportio4a u*)ikv1hl inal to

  A net force F accelerates a mass m with an acceleration xsixe38/p9uk a. If the same net force e ki/sxxu93p8is applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and p6 4livgl rir 8qvj1e,9roduces an acceleration a. What acceleration resultslli4evrr g6v9ji8q 1 , if a net force 2F acts on mass 4m?

  If you blow up a balloonspbg:9(a1r *+mvo;nkd njsh(, and then release it, the balloon will fly away. This is an illust am (* 9bs+:;k1hnpr(gdvjs onration of

  Two cars collide head-on. At every moment during the collision, the magnitu(prendyuhl o;:e()f ;de of to(r) yp(fe;:e; ud hlnhe 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 is an example of

  If you exert a force F on an object, the force which the object exerts onqavw.+t1c59 lfonzbd/i4 6fvqblu 6* you wi/ff6+l n49tzai1*dvwb.c l oqqv b6u5 ll

  Action-reaction forc(cl6t (ysj;+ul pkw /jes

  Action-reaction forces are1xs( +o *oex2iecap v2

  A 20-ton truck collides with a 1500-lb car and s za c schvq*t8 lp,/26rffo29causes a lot of damage to the car.82 ,qpf92rsvtfz slc / ah*o6c Since a lot of damage is done on the car

  An object of mass m sits on,( o.rro+ zot n05notr5kg0hmshx/8c a flat table. The Earth pulls on this object with force mg, which we will call the action force. Wts +tncm5x8ro . z5hrg/(kro ,o0noh 0hat is the reaction force?

  A child's toy is suspended from the ceiling by means zw, j65ryl no63 qnp1iof a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "r65qp ,zi 1ynnwl6o3 jreaction force"?

  Your bat hits the ball pitched to you wwoa p( 8mpgg34ith a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude3(o 8 mpgpgw4a is

State Newton's threeg9,rydx; 3jn o laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of :7v ih7z 5x5(pxqkb.kyn kko+ the following is true about the mass and weight of an astronaut on the Moon's surfac.k5nb7 +: ikyovk7k(pz hxqx 5e, compared to Earth?

  An example of a force which acts at jw,u azh :d y0224gmhsx ks1.z7y nd3gh5ddc3a distance is

  Who has a greater weight to mass ratio, a person wei j7.i vqu-om7401r g+zw s/nvrooq:3 :nsohorghing 400 N or a person weighig ::n7s v4rhwoo+0 z13j7mqvqoo/inousrr - . ng 600 N?

  A stone is thrown straight up. At the top of its path, the net for jp fpo(c8l0,pj/d m*mce acting on it is , /pmc*jf(op mp8l0dj

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same he5wqfmzrc 7 )z-pmm9n+nb v4 5yight. Ignore air resistance. Compare their a)57zcmbfqm- 9n m +wp4zryn5 vccelerations.

  A brick and a feather fall to the earth at their respective termin3jf g,/fk 8sayal velocities. Which object experiences the greater force/38 ak,yfjgs f of air friction?

  An object of mass m is hanging by a string from the (27jmtg5 f/y+hab yknceiling of an elevator. The elevator is moving up at constant speed. What is the tension/j(mbha tfk5y72ny g+ in the string?

  An object of mass m ieebk(s6t ,.n7tx2 -rnqzrq2ds hanging by a string from the ceiling of an elevator. The elevator is moving upward, bn qb.z nsttd,7e22-rqrkx(6e ut slowing down. What is the tension in the string?

  The force that keeps you dt6j.sty. ew -from sliding on an icy sidewalk is

  It's more difficult to start m4(rhbm;9wh3 xu uq1xq oving a heavy carton from rest than it is to keep pushing it with constanqxh 1(u hbmxqw 9u4r3;t velocity, because

  A horizontal force accelerates wzavx.p. vg/* a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the except zwav*vx. g./pion that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down ann7+8 nn(wf vkf1 2icv(:u wreb9u3vgt inclined ramp at constant velocity. Thus we can deduce 3nwr2k:vf8v(n9fib +uc(7vtweg n1u that

  A block of mass M slides down a frictionless plane inclined at an anglemrf:7 .ogrz 5o q with the horizontal. The normal reaction force exerted by the plane on the ogmr7 oz5:.rfblock is

  A block of mass M slides down a frictioncitji xi6d b8c6:r 6q4less plane inclined at an angle q with the horizontal. The normal reaction force exerted by the pl i4rii x6c68cd :bj6qtane on the block is directed

  A block of mass M slides down a fra/ 2 +d42a gqy*xuoz8p: bcclnictionless plane inclined at an angle q with the horizontal. The gravitational force +cguz2qa4cpx8* 2yl/ od:n abis directed

  Two toy cars (16 kg and 2.0 cx;/y dq-;c*w:ljs hat*u h9z kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being c-ds:xtcl9/;zy qhu*wa *hj; released.

  An object sits on a frictionless surface. )4 c2ivcuuo5pb (/ip zdjx)d)A 16-N force is applied to the object, and it accelzd ux2u)coc )(v pp4 dji/ib)5erates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can ac i5yr.(a-4q- wgsieo ycelerate from rest to 27 m/s in 7.0 s. What is the average forward force oyo (5.i 4gsare-i wyq-n the car?

  Starting from rest, a*(ps0 g2(iq( 2mamjh oijc5kc 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body(hc 05 iaigpjs((* okj q2cmm2?

  An antitank weapon fwjtqrz*+a t o.c) b7b8ires a 3.00-kg rocket which acquires a speed of 50.0 m/s after travelin brbwjt*7z.a+)c qo 8tg
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;kwwx- n 1u3,gx(3uabmtx0aa-kg mass from rea3;k g x03,-w u abm(waxux1ntst,

  What is the mass of a person who weighs 11044fmg-jq l )ld lb?

  What is the mass of (wafv+g zu j2za:v a-1vp5m4sm 1lbk9an object that weighs 250 N on the surface of the Earth where the accelef j1:mv 2 +v5a9wmgsalz1zukp(v4-b aration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. 8j.ivm6y fh:s;; * rpkzi3ypsWhat is the mass of the object on the surfaczh:yrip;jf*s kp.3ys i8;6vme 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 weig d7q: dp;q *zry..wqtths 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the t;y zdt.7.pdw *q:qqrobjects.

  Sue and Sean are having a y *x gu0-bii+(vhvy5mkun5z , tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pullsuvg5x(zy-h* iubn kvmi, y05 + 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 level frictionless surface. A+e( 7lzol 0:ios/2bnb:sytyv force F acts on the stayys :v2bl s+botz i e7lo(n:/0ck, 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 elevatn.yhq8 ww /-mmor. What will the scale be reading wyn8/w- mq m.whhen 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 pez fm:( -y5fmdpb 2*ojkrson is 60.0 kg and the eleva- y: kbdj5(m2*pfm foztor 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 oilxhk* ;*0 mi i0sgyd+xeh26nf the person is 60.0 kg and the elevator acceleratesi*xmk +l0sy ; dii2hxg he6*n0 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 a magnitude of 8.0 N x g, 0vqpq1km+and is directed due north. The second force toward the east hasmq+ g 1q0,vkpx a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on tcqj,xczs)wu5g5tro 8 e 6jz/ *he flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force oc *zcjtxe r8/6) wq5,ujo5gzsf 9000 N. When the truck 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 6000 kg rests on the flatbefa(w2nhg-79akf7i* zw 1 javjd 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 w7 (-aifn7fh*ajk9 g zva2w1jstopping 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 b3fhbcf ai*/l6ra+ 3k m = 0.40 kg, what is the magnitk 3bc 6+*falrh/ab3ifude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine show n)e1qr: yyq7cbr4a8n n in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore fricben8ny74 qarc)y q:r 1tion and the mass of the pulley.)

  A student pulls a box of books on a g7gdy xfqz9)f2cym,c8- ypxc19t t ,tny-jn:smooth horizontal floor with a force of 100 N in a directyz,gg c8-xdy fx2 :ny1ncpq)j t9m97t ,tyc-f 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 horizo x 0wua xx;7+oxwyq1c1*ulbqy : qs9f;ntal 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, what is the normal for10q9q+xfy;aqw x*obu u7xw1cy ;lx s:ce on the box?

  A traffic light of weight 100 N is suppoyr :6bt -k8c 9satwx*-lj+npurted by two ropes as shown in Fig. 4-2. What are the te:-c- a9bj*u 8yn+6klstptxrwnsions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N,o +fu;)l0icky what is the mass of the traf+; cyoifk lu)0fic light?

  Two boxes of masses m and 2m are in contact with each other o;qy cti);15a a b*a vewpn2nm;n a frictionless surfaa*q2ni;v; tnwp 1e) mc5 a;yabce. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each othe5q3ukudwk5 . wc z9sk; cf*teppt*1t +r on a frictionless surface. (See w c k.u; 5k1 3ktdzfwp5+uce*9 tpstq*Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected byk)044tx mwa b)xvq1 sl a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension tv1axkx4 s)wl)0m bq4in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fi u9b2n ef:xzx (j,sue1g. 4-4.) If the forward force on the more massive b , uxu1sn2eejb z9:fx(ox is F, what is the acceleration of the less massive box?

Two boxes are connected by a a:ua;gk q bb sy/c5oytx(9.:t cord running over a pulley as shown in Fig. 4-5. Box I at9o .5 g cs kxbbyyt/(:q:ua;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 c5fp6j/y(qi7 ax tzz;( 8sl wqfrictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectivelzp (c 7lizt8w5f(jq x;aq sy6/y. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of ;l g5oa/p (s3of5owvs static and kinetic frictions for plastic on wood are 0.50 anso/a5o slf; gvo35 p(wd 0.40,
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 +b;9 gk4vozhqlevel surface in the +x direction. It slows and comes to a stop with a constant acb gkoqz +hv4;9celeration 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 fqp+9x ,sh 3b:3lxbvrked/ m- oorce. A 3.0-N : q/kol+bemp-bxvr9x3h3 , dsfriction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4:)tuuii+/ajjf7.myfr8.h bz;kg0e * v txpd/.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 slides mbm5w04b lcj150 m on the ice before it stops. What is the coefficient of kinetic friction between the puck anl j105bwmcbm4 d the ice?

  During the investigat0*xkzhos;7r 7zg+cil3 rb4 xdion of a traffic accident, police find skid marks 90.0 m long. T4 ;x73rg+ob7 dsciz h rz*0xlkhey 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 the car when the brakes were applied.

  Two boxes of masses +en2 fhts o9*;4yeiu rei6tu0m and 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal f2e9teyius6 enhi;0 *o4t u+rsurface 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 the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fv3+ n3kd sk g-q7i,smvig. 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 iss k sd-n,k7q3gm +3vvi the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane isb9( q r48p(ytfr;gno k inclined at an angle 4p ;qyn9ftrr 8b((kgo of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a fl v5o55w7q/ bvne qhxfbh v4x) ub7(a/yat 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 inclw3k(s9w4m iag ined 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 i uxv9:o9ac od8li5mrt9 4 7egonclined plane tilted 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 dib*d)9 :cy0(b jqsjbf cvj18lwrectly down an inclined plane, at a constant velocity of*)lywbcjs 9d q(fv10b j: jcb8 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 downomo;z 8k 68rkcv fq67n 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 dowapbkm.jwl .(0 n 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 weighi 8sgy jp9rhq4*ng 500 N along a rough surface. The cable attached to t*syrj 9q8gp 4hhe 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 froo i7 9tijl9h-bdr97hl3 +tz osm rest on a rough inclined plane tilted at an angle o s7lrji+3 ldhtit9 o7-9zobh 9f $33.5^{\circ}$ 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 an .y n(n9ev;fgfgle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is thvfe f nn(9.gy;e coefficient of static friction between the object and the plane?