Which of Newton's laws best explains why motorists should buckle-up?onjb33 3/adkub*;d u dm( imd(

  When you sit on a chaipmwy8 u b,5wxy,; 0cxbr, the resultant force on you is

  In the absence of an externaly(33x j1fc6 gt6xhfqhj m2:dxt+vou 5 force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIa1uf-27 dt/; iv59c*jgt:hn blgyh bhN are suddenly turned off, while traveling in empty space, the starship wtag1hbtd9: 7hh v/gnjub*-y ci2l;5fill

  A rocket moves through emptxu)ark v )y.y3lcsh0aq1fs * ;y space in a straight line with constant speed. It is far f s3)cq)x0f.1rua k *ylhsay ;vrom the 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 movingv4ty is eyo0m 6*9ekgp;4ue6d bus, facing forward, and you suddenly fall forward. You can imply fey4 gu op v6k;s4e9mi*6d0ye trom this that the bus's

  You are standing in a moving bus, facing forward, and you sudl y++msp ae9 u/s87cm)tvtqb +-kp+rfdenly fall forward asy t)ckvm as pe+p u8ft+7-b+lrq+9/sm the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of th:ds8 f4hxkkp*zkb +* +k-rfzse object.

  The acceleration of an object euv- 9qvf1)l fq1o-vs9(mji w is inversely proportional to

  A net force F accelerates a mass m with an accelerlio9wwd;:gz4m e f2l7se :l4d nbc)a*ation a. If the same net force is applied to ma ddbzf; wc:l2 geol*amle)n 7:94isw4 ss 2m, then the acceleration will be

  A net force F acts on a mass m and produces an accelerat,rs hm(ojoq5i le.u:*ion a. What acceleration results if a net force 2F ame ou :r,(o iq5ljh*s.cts on mass 4m?

  If you blow up a balloon, and then release it, th:m,jnjh ), *ldwycu; ve balloon will fly away. This is an illustratiov uj m:,,wdc jn;*h)yln of

  Two cars collide head-on. At every moment during the collision, 32-nbd zq01qyo lc1 aothe magnitude of the force the first car exerts on the second is exactly eqq qo oa1b- 10dyz32cnlual 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 va, o;1rah*)bcp nz)h:, oxsiizj+ d/object, the force which the object exerts on you will1i;)pc:,b)rza dj/izohhox+ v* ,s na

  Action-reaction forcesiqh;y0; d pz,l

  Action-reaction forces ar: jb;p7j4r-bitu3u7h y 8pfree

  A 20-ton truck collides with a 1500-lb car 118+ke/ghnjfynutn ; m(ei e /and causes a lot of damage to the car. Since a lot of damage is done on the c n 1n(/+myef;/ke g8u nthj1iear

  An object of mass m sits on a flat table. Tr wsj 60+k( o6xwlegm7he Earth pulls on this object with force mg, which we will call the action force. What is + 0kmjelwsr66(7goxw the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earto12x0ahc k9 k6itzk d(h pulls downward on the toy with its weight force of 8.0 N. If t0 h2ac1xik zo6d9k( tkhis is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you wi l*-g160r3d upkuzrcuth a 1500-N instantaneous force. The ball hitsur-30p dz6rug1uc*lk the bat with an instantaneous force, whose magnitude is

State Newton's three laws/cwwww.i .8 na.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than ono*v8mzjhr,y *b. +x rr Earth. Which of the following is true aboy ,+x*.h*rrb jmor vz8ut the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts athno a *l-t,nh6-ah pjn78pgm ryq9s2( a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N uhsmko) )dc: .e;nho83( j) srifju+zor a person weighing 8 sn+jmir).kh)f:3j( c z)do ;sehouu600 N?

  A stone is thrown straight up. At the top of iiok8a7 u:k bw1ts path, the net force acting on ikbuk8a io1w7: t is

  A 20-N weight and a 5.0-Ny 6,;allqig r:pal .b7vex j48 weight are dropped simultaneously from the same height. Ignore aixb8 g, ap lyj 7vlri6ela4;q:.r resistance. Compare their accelerations.

  A brick and a feather fall s7 )syj(trq o4to the earth at their respective terminal velocities. Which object exper4) ( tqjsr7syoiences the greater force of air friction?

  An object of mass m is hanging by a str o iev wsrr.4k:q2.3sjing from the ceiling of an elevator. The elevator is moving up at constant speed. What is the:vssk. wrr 4o3qje2 .i tension in the string?

  An object of mass m is hanging by a string from the ceili+x.d.aqa1wht6jga1 9q7 ht f yng of an elevator. The elevator is moving upward, but slowing down. What is the tensy .1aqf hag1 9tadq6th+xw.7jion in the string?

  The force that keeps you from sliding on an icy sidewalk(c ks48lila- q/bukw. is

  It's more difficult to start moving a heavy hi5bt9(-eg. h t kbq*0dric5 gcarton from rest than it is to keep pusgriq 0t-idh *bhc559 b.gek t(hing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizon dh/ 8e29razcnqa2 fqo 34+dr5nwqpu2tal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception tauhn fwcoqqr na22p5qr8 +dzd /423e9hat the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides downg bxx6,8 xelriw;m30n an inclined ramp at constant velocity. Thus we can dbe r,x;3g x 06nwmlxi8educe that

  A block of mass M slides down a frictionless planwnnm.vp +3rr3xf,f;i ogo *id4-m t +xe inclined at an angle q with the horizontal. The nmt*o -i,xnv;+nw.4dorx f i33f+mgrpormal reaction force exerted by the plane on the block is

  A block of mass M slides dow cba8 6y8alss-bvi)y0 s(lt:rn a frictionless plane inclined at an angle q with the horizontal. The normal reaction forcess(vc8 l8i)astb yyl6rb a -0: exerted by the plane on the block is directed

  A block of mass M slides down a bjb92h7:l1yu rorvtf a -vi( 8frictionless plane inclined at an angle q with the horizontal.ab hrr (yvb:fulv71it928- o j The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultn m8f wry76t2aaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acce 6mt72w f8ynraleration after being released.

  An object sits on a frictionless sur989:p r/qzvy jb ain6vface. A 16-N force is applied to the object, and i/v 8ir:j9z96v qnya bpt 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 s. Wh)fi3bfv8 idiw/p9zvi(( *d u oat is the average d/i*9i db f(vupw(z3i ov )if8forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8 p+g5ecq1b qa*.0 m/s in 2.0 s. What is the *b+p5 qqcaeg1 net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.l4o5lx( j/n ytzm.em-(/is a o0 m/s after traveo(4a-/i( l jse/.lxmmzno5ty ling
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 fn)16;owb4c p xecza twv9,fo 5orce that you push a 10-kg mass from rest vz9tw4a5)nxw cfeb1p;c o o6,,

  What is the mass of a person who+ox bq gige .7:nhiqp)an it,z(-4+hb weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface ob37p5nx -u -nyr1 aqqyf the Earth whererunq7a3b5pxy n1-- qy the acceleration 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 the 6qq y7 epo*w*lobject on the surface of the Moon whereqlew**q7p yo6 the acceleration due 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 Moon. The *+;ds o7.jg*cpl7iuamyru d* Moon's gravity is one s sj*iar *p7dyco. ul*dg um+7;ixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite endvold(im)is6v m7vr0 *s of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates towa)simdv(vo7 r6i *0m vlrd Sue at $2.0 \; m/s^2$?

  A stack of books rests on a01fl)snvpqkrr3c;3 p level frictionless surface. A force F acts on the stack, and it acceleratesnkvp3 0p1f l3)crrq;s 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 elevolbn 3xyww: hexwk 652h o,o,-ator. What will the scale be reading when the elevator i3ow xoh y- n2w,xo5,kbehw6l:s accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of zw 1k nq+0mx7zthe person is 60.0 kg and the elevator 71x m0+w zzqknaccelerates 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 masv;f ijci-1 n-* sehcw+n 20qous of the person is 60.0 kg a1nfc2q-; siu ej*iv hn-o+ cw0nd 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-kg mascn/w(t,: ma+as dt sm4so2x)os. One force has a magnitude of 8.0 N and is directed due north. The second force toward the 4,mcxm 2ot ans:ds/(ao)w +st east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg restsnc vj:xejx )45 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 t54 )jx: xnjecvraveling 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 k)jdu 92bx khwo,u +l-lg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a ma+k9bx),hw u jlu-d2lo ximum 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?

  In the Atwood machine shown in Fig.rgw x16i4jn 1vddnx(kwg 8,;0qxqdn ki2s,(r 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system xjxin,w dd(201(sdkr;8 1xvrnqki,g nw 64qg? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. mumicr2n ;f 7gj4i:u9 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the strfmi u9nr;: 7cu2m 4gjiing? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal tib0u ru,89 ce/md 93zg1copptkl2 t7floor with a force of 100 N in a direct,0du3l1et/c9pcbo9 t2zmiu 7k8prgt 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 smootqw g c;8cu(9gyi3e1trh horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the w; 1gcqitr 39yc8u (gebox and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as dq)a3zzb7(y n shown in Fig. 4-2. What are the tensions in the rope(yndb37q azz )s?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the traye/s9 li i03suffii3/ sl9 siy0uec light?

  Two boxes of masses m and 2m are iz; b8a z0;kv4b: *a nk+jfg6q kswc)mvn contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of zvv 8ks+km;c0k6) nb zawjq bf4*;a: gthe more massive box?

  Two boxes of masses m and 2m are in contact wanab4m2 l)zf8 ith each other on a frictionless surface. (See8ba42 zm na)fl Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If )i3jd(fzzjw 4the forward)z(jd3if jz4 w force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and ssg*xb 1t2er* gmt fu +*0bt:l2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massive bo0ts *bbe*fu+g 2:srgx tm*1 tlx?

Two boxes are connected by a cord running over a pulley as shown in *-ywx zye w1epxa,* :jFig. 4-5. Box I of ma,w1waxz y: p*e-j e*xyss
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 kineti hm/nk zzm85e-c frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respect/ kn5m m8-zhezively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions fordq;:kyp wya*mox77z:5v :u hd plastic on wood are 0.50 and ad:7; oq5hu:vyxmdpk z :7y*w0.40,
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 l o9agt7a yp*:zevel surface in the +x direction. It slows and comes to a stop with a constant accel9yp7oagta:*z eration 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 stc*uizvm 4 q. -,5fcjcurface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of thivu,jzcq5f4 tm*c -.ce object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from vq-uc ;vap)k -38cy,+kmo mbqo:(j corest, 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.nv6of9 8jrswk6+lq/m s f* qvtb/c7t given an initial speed of 10 m/s. It slides 50 m on the ice before it stq+/ 7vs66jq*b/cms w9 ofr. lkt8fvtnops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police f2f,q*q dyl+ub ind 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 the car when the brakes were applied.qyblf +u,q2 d*

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The sug*7* ogwi 2qju du1b;h7un7 u)vm mr-yrface between the more m*y7muun7d v2 uhmr)bjg* -7iwo u;q1g assive 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 static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) ;3fu85pu f+u6vw nlgc The surface between the more massive box and the horizontal sw+uu6pfvl cgu f358n ;urface 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 plar4uk0yf/7czy ne is inclined at an angle oru7z/4yy0c fk f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that 0ikypgkouy.8q3*1pn 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 incli7d2js*bz m u)mt)e9/ /ip klqfe)l7hs ned 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 at an ax.4jk-d lw6vlw 2f5uk4a+ ba kngle 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 bhlp;/ m005mr edgz j8an inclined plane, at a constant velocity of 6.b g p80m/;lm0j d5hzre0 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 slidesadkga 0ei76-hp * n(zl 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 iu56 b. hu.d .nhim3nvdown 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 sur0ha:a5wm jw2oqmt(6a87mx dp*u .t tfsn;bx:face. The cable attachets.x 2wm a hd *aa68ujp7(5mmxq::t;bnfw0o td to the 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 from rest on a rem gzu7 ,kov;-z 49liecknc4)ough inclined plane tilted at an angle 9ioe m,zg -n7 ekc)4kv4czl; uof $33.5^{\circ}$ 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. .crgoula37 e0m6qy5v xlp ;j:a :1jtpThe angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coexj 6:m0yp5 ;c r lat1lo pju73gaq:.vefficient of static friction between the object and the plane?