Which of Newton's laws best explain+x/+ dqxxynn4tp6 0qns why motorists should buckle-up?

  When you sit on a chair, the resultant forvg /a .p:k( 9rl )d3aivsn9vqdce on you is

  In the absence of an external force, a moving object wilu w m3nqc2umh67i+vp.gki0k-l

  When the rocket engine5 +s /bah5ahwygj-r, ns on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship willyrsahj a bnw-h/55+,g

  A rocket moves through ez)dj:m7q copnry /13ycd 67vvmpty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. vcqc7d76yjmp/y:o1 v zrn3d)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 suddn-y jldh,7uqb+f s -m4z,k*gsenly fall forward. Y7dj uh--zs y,qmlbfg,n +4 ks*ou can imply from this that the bus's

  You are standing in a moving bus, facing forward, and z*fhv w*8aid 37,c2pd h vop8myou suddenly fall forward as the bus comes to an immediate stop. What 7 zap8 whv*p i f2cdh*,38odvmforce caused you to fall forward?

  A constant net force acts on an object. Described3phr, rla/c* 08icqn the motion of the object.

  The acceleration of an object is inversely proportionacou 53far:v,m 1v lid1l to

  A net force F accelerates a mass m with an acceleration a. If the same net f2g(n8 a*zqe pt:tma b4orce is applied to mass 2m, then the acceleration will:qa a4 8pmbe t(zn2t*g be

  A net force F acts on mc/ y/ou8g x(f29n ujwa mass m and produces an acceleration a. What acceleration results if a ne 2/wmu9f(cnyug8 o/xjt force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the bvv3;*oiigyu 0alloon will fly away. This is an illustrai*y0;o3 ig uvvtion of

  Two cars collide head-on. At every moment during ay) j*47;lg 7v oov.rjv0pqjy n;tir 3the collision, the magnitude of the force the first car exerts on the second is exactly equal to the *r 7 gqojvp ; 3)j;v jyrov7.0tliy4anmagnitude 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 hjf27o jyj i )0gs0,koj2)(vv 8jukocexerts on you willgj iokocu0))vj j(j8h o7vy , kj0fs22

  Action-reaction forcep)a q-n2jzb f.s

  Action-reaction forces ar2quur kljajw 4(q6b* 3e

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to th u.gpni15ec)pfw0q; ue car. S.5w; ip 1)ne0ugqfupc ince a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this sxy,ilp 2pj* y /1c*hv-qz5gyobject with force mg, which we will call the action force. What is the rxvgyq1 *,ilycsy p5h j2-/*pzeaction force?

  A child's toy is suspended from the ceiling by means of a string..8w n rk;e;;/mghk tzv The Earth pulls downward on the ktv;;mhz/k8 .g r;enw toy with its weight 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 r*f0/h nj6eea 1500-N instantaneous force. The ball hits the bat with an instantane 0*ea/jhr6nef ous force, whose magnitude is

State Newton's three laws.i 1zm*d h *gpvn7.vr,u

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of tvlfhclyu :7:8 he following is true about the mass and weight of an astronaut ov 8l h:uc:fl7yn the Moon's surface, compared to Earth?

  An example of a force wht k g(vv(w6c1rich acts at a distance is

  Who has a greater weight to my-/ pp)nm5uhy)hn as g.1)w emass ratio, a person weighing 400 N or a person weighing)ywm1 )-h/h )pn5.a meny gspu 600 N?

  A stone is thrown straight up. At the top of its path, the ;yd0f8nir605aint3,1 fii2p iny ki xnet force acting on it iaifi y iy0i5n2x3nr6;0,p1tk f8i idns

  A 20-N weight and a 5.0-N weight cw6bja: /twi2.g;d: hkv *mtyare dropped simultaneously from the same height. Ignore air resistance. Coahwck: t6 2im/ btjy;g.v* wd:mpare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocitieix nx;n4h1dolq/w1 c2s. Which object experiences the greater od1nn;/1lc2q xxh wi4force of air friction?

  An object of mass m is hanging by a string t .+w0 h9xkvoaq/3cjp from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the string?j/xkcavt p+ho9 w0q 3.

  An object of mass m is hanging by axu 7di1x 1*jbm string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the strm1xxi*db17 juing?

  The force that keeps you from sliding on ci f2.zb)v/,zkx uy ;zan icy sidewalk is

  It's more difficult to start moving a heavy carton from red- 5p*izo7ad jst than it is to keep pushing it with constant velocity, ij-7d*zd5 p aobecause

  A horizontal force accelerates a box from rest across a horizontal surfac nbwl7- ipr)k9e (friction is 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 boxlik 7r9 w-pbn)'s acceleration?

  A packing crate slides down an i/ y5v768 2xz8aisqj;zz tlayinclined ramp at constant velocity. Thus we can deduce thz7882;si/j6 xztvay5i ylaq z at

  A block of mass M slides down a frictionless plane in9mm*r93p mc0,mwv4 )nahe wc fd.2 eosclined at an angle q with the horizontal. The normal reaction force exerted be)srw*ma9f0mm.d4oc 3,ph2n e vm9cwy the plane on the block is

  A block of mass M slides down a frictionless plane inclined at ans r7l bque; mgraqc04cf.8w;+ angle q with the hobq4a. q0wm8e; uflcc7 ;+srgrrizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at -*.d nuwu;q vyan angle q with the horizontal. The gravitational for.un-yvw; ud*q ce is directed

  Two toy cars (16 kg and 2.0 kg) n- r p1hj y6dt,cl.(bzare released simultaneously on an inclined plane that makes an angle of 30e with the hn jd.1h,p(cbt6ryz-l orizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. v-5dx.r voro)u-e(y 8*q;dmdtfa)ob A 16-N force is applied to the object, and it accelerat) dot)u(de5-q;.o-a mrdvv 8byroxf *es at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelera(nwl.2f hi4c eyslysype x s;hjo-6/ ..n o56wte from rest to 27 m/s in 7.0 s. What is the average forward force on the carsle.6.5cx 2o4/hsywin oyehjys;lpn w6f -. (?

  Starting from rest, a 4.0-kg body reache 0ib0u)jv d/yys a speed of 8.0 m/s in 2.0 s. What is the net force/v0 y uby)ij0d acting on the body?

  An antitank weapon fires a 3.00-kg rocket whic/x1l- )cs d)slg s8euhh acquires a speed of 50.0 m/s after traveling ul ehg-) scl8)dxs/s1
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 smxvbo(o*t 9mj-rb+ 9iame force that you push a 10-kg mass from rest+ o 9*mxo-tvrb9b(j im,

  What is the mass of a person who weighsu2 y*0brpb9d w ibx:v1 110 lb?

  What is the mass of an object o9ui3g2*e nzn-vusf2 2 ms5y5/lnruvthat weighs 250 N on the surface of the Earth where the accelerati9 uvs2g-f ynnz /m32oe lusur*25niv5 on due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of th5l sg l*p zt2ngvl-09be object on the surface of the Moon where the acceleration dug2n0l*zvlp tbl9-5g se to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40dcle9t9wair(nn-7c ypedwx0-v/ 3 f) N on the Moon. The Moon's gravity is on-y/dafw3 wn-xpv(7n eclir)90d c te9e sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on oppositdh u8p ;j 6lmc53w8hgf v;kqx4i,bj9 ie ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue atwg4h9 8fj6,b lqm;ji 3 ;5dx8hpkv iuc $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts oni*2rn2-l0,3f-ie,ci j :tygm m k yhtx the stack, agmy*ilc,0:,m2n2tif k-i3j xyhe -t rnd 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. What will -hqsmoynt4u,s(r(6 qthe scale be re(r6nt(u s q4q,-moy shading 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 isx t;i.a 8 7fc+yvbo6be 60.0 kg and the elevator accelerates downward with an accelerae7x6fc y+ib .a;ov8tbtion of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If thr t.rp bw:) y-o*sil4a b4hk+pe mass of the person is 60.0 kg and the elevator accelerates upward with an accelertrhppk)i+*rb. :4y woal b -s4ation of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass:a 8 tot)wwx.kdm :i2ccvw52 7 q0wnih. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east haw2n qc:80vm7kh. iw25id w):cxttowas a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatgy 1qv;s9yfh5bed 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 distance if the load is not to slide forwar9vh1yqsg f; 5yd into the cab?

  An object of mass 6000 kg rests on the flatbed of awkm02l 9 aw x,71ucwuf 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 19w2w uum,xw0 lkcaf7stopping 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 m = 0.40 jodsdj +2 tg6r0s4x2zkg, what is the magnitude of the acceleration of the system? (Ignore friction antjog zss 42+xd20rj6dd the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = bc/s x r4,iug70.40 kg, what is the ten g su4r,x/ib7csion in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a fold lbds; ecy-/m1kv 5:rce of 100 N invd:m l/sce51;b yd-lk a direction 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 hg59e .sc6 mdhoorizontal floor with a force of 100 N in a direction of 37.0e c e.go6d9msh5above the 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 ts)0-iz* il 6fcl dt 8tsb;z+esupported by two ropes as shown in Fig. 4-2. What are the tensions in theil0z*st6bdfis- t8cz t; e)+l ropes?

  In Fig. 4-2, if the tensions in(vr3x: q r.qlswn(+ i)ln5ouyo im/5h the ropes are 50 N, what is the mass of the traffic light? vs lq53ml(iw.oy :/(5)ro hqn nxur+i

  Two boxes of masses m and 2m are in contact with each other on a frictionless su.w 9fz)jb3gx1lvj9y orface. (See Fig. 4-3.) What is the acceleration of vjg)f9 b9wzxlj.1oy3the more massive box?

  Two boxes of masses m and 2m are in 5nwmw7pt f:gp8z u l0.contact with each other on a frictionless surface. (See z mwp07l:.nw5tf 8pugFig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected byjjpr*qzs 3s: anv3.(m a rope. (See Fig. 4-4.) If the forward force on thersa.:vs(p* n3m3jjqz more massive 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. 4-4.) If thephqv3 2afw 24b forward force on the more massive box is F, what i2 b 3wqhv4af2ps the acceleration of the less massive box?

Two boxes are connected by a cord running over a pu2r c 6 6ln(jb*t2ta7igb/ wecylley as shown in Fig. 4-5. Box I of marte2b7ajciy (w6n/2b glc6* tss
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 andmk;ncq)g - ;pf 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 thecq);fp- mg ;kn box?

  The coefficients of static and kinetic frictions for plastic owi 8eh-i drvv5d;gf+i+8 f,w qn wood are 0.50 and- i vwv+8f+ef wdi5rqd;h8ig, 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 level surface in the +x direction. It slows and coq*9v kt 3r3 sxh0fxc6tmes to a stop with a constanrcx0393fts 6vqht *k xt 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 s: vahen6w ()imurface is pulled by a 5.0-N force. A 3.0-N friction force retards v(n6 :a ih)wmethe motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg tiq49lr y*;/:e grn abmass, 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 anme iibocs-7 04n 9t:ja initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the cnaosb-mcj0i 4e: t 9i7oefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police fin8 kqj:cn kqrt4r4el8 2d 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 pre8 lj:4qrkck r8nt24qevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3nmrz6 7w ks )ugt*fh:o;mj9fp:q7t v+m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between thf+s:qk: m 7g*;nwovt6ju 79 f)pthmrze 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 Fig. 4-6.) The surface between c.scl 7;lagr -the more massive box and lg7- rc;lsac.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 coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined h0f*w*)-q fh( znfiznat an anglehz izff n)*fhn0-(wq* of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides d0umk; av/ ldgk)q w 8om-s+h:nown a flat 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 anglec5y z up*d9 gi,n3-bni 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 acsyls5g8ojue : lkcg.q(x; krki9. n 8+5ukv-n 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 9x;l(z.ast gw constant velocity of 6.( 9.tl w;gxzas0 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 slide78c)/d6fihkrws ra cz;qxgmv-8m6cws4*c )c s 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 down3do 2ig(6 tepl 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 weu db mj*(v 9r(wty 7r31 rfqenqutt3)+ighing 500 N along a rough surface. The cable attached to the log makes an angle d*f utbey33 tq9((rrtu qvnrjw7 +)1mof $30.0^{\circ}$ 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 res-hm/ ijtncd7-:1 mvs qt on a rough inclined plane tilted at an anglejmdh- qn-/vmsi7ct: 1 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 ab 0sfvsy0 8*evngle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of sts8 v* esyv0bf0atic friction between the object and the plane?