Which of Newton's lawsj hj6( my-c5yo best explains why motorists should buckle-up?

  When you sit on a chahnw3z9(g8w) m8ch nc. d,oukwir, the resultant force on you is

  In the absence of an external force,z0ap )ei-vgpggvfpd1,:h 0 s1 a moving object will

  When the rocket engines on the starship NO-PAIN(actb w3-*b4onae1oc e x 97r; +vbone-NO-GAIN are suddenly turned off, while traveling in empty spt anvbeboxwe-cn ob1e9c *r7 o(a 4+;3ace, the starship will

  A rocket moves through emptyyyt;x /x3r*rh )cuwz( space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the f3 ()yryzt uchwxx;r*/ orce 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 suddenly fal9jseth 5i- r:u*xn,zs l forward. You can imply from tjuezt,*h x n-ir5 s:9shis that the bus's

  You are standing in a moving bus, facing forward, and you sudden r(7-oyuz(/ 1jzavsbvly fall forward as the bus comes to an immediate stop. What force caused you to fall forwardvrob s (yzj -7u/(z1av?

  A constant net force acts on an5k02trs urjwg x 5.p3l object. Describe the motion of the object.

  The acceleration of an object is inveys- 8 +9v qvx3m;:dcxvvy6ve krsely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same 2 gdgac0/ kzlk3rv*c9 net force is applied to mass 2m, then th *rl2k9vc c0d3z gkg/ae acceleration will be

  A net force F acts on a mass m and produces an a5l;,s ye rus:lt(e /ul-bqo(xcceleration a. What acceleration results if a net force 2F acts on mas /yllsx;r( teuus:olq(b5- ,es 4m?

  If you blow up a balloon, and then rel vfkhnswvv 58r o1)/9bease it, the balloon will fly away. This is anv9bhvr5 kw/f)v o1 n8s illustration of

  Two cars collide head-on. At every moment during the g2 j /xw/fkf9tcollision, 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. wf x2jf/k/t9g This is an example of

  If you exert a force F on an object, the forc/bgk*yyt+bdik)efj7g ( - g-re which the object exerts on you wiy -gk7f tkdeg/ ir+(j-y bbg)*ll

  Action-reaction forc3q9 ef/hx3)vv rw 7xwy uhm,;ces

  Action-reaction forcesdf 8*lk.r lpqy*cw0 ;q are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage tox6n-6a d+5hcyazkd ( e the car. Since a lot of damage iska6c +xe 5d(-ad6 hnyz done on the car

  An object of mass m sits on a f m -i;zabxjo(on b).f1lat table. The Earth pulls on this object with foo- xbb.zn;)m(iafoj 1 rce mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from : a mdq)5opgvnx22a3wthe ceiling by means of a string. The Earth pulls downward on the toy axgdqm 5:2opvn w2a) 3with 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 1500-N instantaneous force.ln+ vyg,okgbiz5kj+ s3. ,, oe The ball hits the bat with an +o ,gi .bg,l3z 5sko ,vjenk+yinstantaneous force, whose magnitude is

State Newton's three ladk lvi *7u eb*vx2.lr 3m xss5 /u)3/e)xnkrcxws.

  Mass and weight

  The acceleration due to gravitq b ki-dh27erd+ddc ;q7l8fa+y is lower on the Moon than on Earth. Which of the following is true 7;rd2 87+ahd+k ddqbleqcif -about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a 8 if 0)+cq ddbz8gbutlxy;,o;distance is

  Who has a greater weight to mass ratio, aa-5o))b -sffc kh hjo; person weighing 400 N or a person weighing c5bj); hsa-ohf-of k) 600 N?

  A stone is thrown stv)ea55 2 uocporaight up. At the top of its path, the net force acting on i) vp5co oe5a2ut is

  A 20-N weight and a 5.0-N weight are dropped simultaneopv,q;zo9:m eumk -v d1z4g 3hqusly from the same height. Ignore air resistance. Compare thek 1 d-43mg oqqvhvez ,uz:;mp9ir accelerations.

  A brick and a feather fall to the earth at their respu-b ndc.zk.(2u z )3k5e+7lyb jeloxx ective terminal velocities. Which object experiences the greater force of air frictio5+b jzu.e7zd .onu3kcb-y2k( xx l) len?

  An object of mass m is hanging by a string from the ceiling of an eleva;r;) f:y vvut0: byjico)cis7tor. The elevator is moving up at constant speed. What vyj;s: o c;r)i 0cy7v:b) uitfis the tension in the string?

  An object of mass m is hanging by a string from the ceiling of p:bj(k1,t3a.lyr+hbn e2vmm an elevator. The elevator is moving upward, but slowing down. What is the tension in t v:jmr(k+p.bbe ahy,tl12 nm 3he string?

  The force that keeps you from sliding on an icy side d4zpm;g-hpha2z-, vwwalk is

  It's more difficult to start moving a hjdb t0-9p rv 4n pt*pz;wl+;ajeavy carton from rest than it is to keep pushil0w z9ab djt vjr;tp-ppn+*;4 ng it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizon: o-:4z; d1yrmjfk j/w)oiwwn*: wg qbtal surface (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 hwi yd /m:jrzo* wn4k) ;b q1-g:fw:ojwappens to the box's acceleration?

  A packing crate slides d.,/bex n ey9hiown an inclined ramp at constant velocity. Thus we can deduce tehe9i y xn/b.,hat

  A block of mass M slides down / xio4npq89sn2lc:q o a frictionless plane inclined at an angle q with the horizontal. The norma 2qilpxnno:8/9q cs4ol reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane incli bmejv7z22ttzc ) e6.rned at an angle q with the horizontal. The normal reaction fo7ej) 2 mtt2.bzr6zecvrce exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q with 6dzq 39+v2nur3c,qy 1uj(m x gz,kalithe horizontal. T9xu 3u+,z q2cvld qga6y,1 r(ij3k znmhe gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously5e900aq zalsx re3-:3l*2e ozmivjx t on an inclined plane tvxxr09e3 a z0i*m:5 sotq-e2z3eljlahat makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless suv ya8q2gw)a5*wa x4hnac 8. kkrface. A 16-N force is applied to the object, and it accelewgxn8c.aay2)a*4 h8qkw k5v a rates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can acceleraqs9 1hjb- k/lpgqb(w g 20u4skcal t35te from rest to 27 m/s in 7.0 s. What is thu1ckl 053 t sl(94j-bq2qkbphgaw/g se average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/u((rwp7j0qs(n9ew-v rtpb 0 hs in 2.0 s. What is t snv00jh(r(-bpq u 9pr 7wtwe(he net force acting on the body?

  An antitank weapon fi- wf5kvzja e b6 **gyqv+zpt2(res a 3.00-kg rocket which acquires a speed of 50.0 m/s after trave +bvty-zzqpag(e6kjv2 f *w5* 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 w7 zuypwe. le*(v2m(eygdn-a, ith the same force that you push a 10-kg mass from resdgpa.y , z((leu2 emn*e-y7vwt,

  What is the mass of a person whokiabx8;w 3):;ak d mex weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surfacefgextn z -qypgp2l3 *j; 83ur/rv,t .p of the Earth where the accele,grl-xpjg;t3ny 8re fv pz*tq3pu/.2 ration due to gravity is $9.80 \; m/s^2$?

  An object has a mass :h-b.adxhv 9j hrois.p 0j+d4of 60 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravs h 4.9-ijhx+h0 bv:dor.adjp ity 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 M ;b vl gl673nqp2/bka5w j7x d41o 1qwyh-ztmtoon's gravity is one sixth of Earth's. 7bbthow4aym x-1qg lvj k6 3d;ltw/qnpz257 1 Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite en + yutdb8vq/e+u/ 7f, yb*wfjpds of a 5.0-kg rope. Sue pulls with a 15-N force. Whate+p7yf tu v8/ +bwqy,*jb /ufd 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 acts on the 3vn0ix7a6jyv stack, and it accelerxvj06n 37yva iates 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 k21r:j,1t/ 3jd xpesvyio.3ks u 2w5xz)m dxeelevator. What will the scale be reading when the ele1esut,js3/2i 3v2 rkjoxwz.e) kxdm5:pyd 1x vator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 kg+bqylto-0 tu/.pw d w5 and the elevator accelerates downward with an acl-td w 5.+qby wut/op0celeration 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 of the person is 60.0 k3(f 9izk):y v j.k8esk(o4 w+cyeyvzxg and the eleyx :v+o(z3wyjy ec.ez(f)k 8k9s v4ikvator 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 mass. One forc7 m u3qbrh 7k39qlgdr.e has a magnitude of 8.0 N and is directed due northmk 7qq.79g ld3u3r bhr. 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 ;v*8;qfun km/humu b8on 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 distance if the load is not tomhmun/buqu;v*f8k ; 8 slide forward into the cab?

  An object of mass 6000 kg rests on the flbsuuz. 8m)b76 raub t(atbed of a truck. It is held in place by metal brackets that can exert a maximumbusu rtbmb( 7a.u 68z) 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. 4-1, if M = 0.60 kg and m =vn42.1a*s um bvq(2ij n ykcu8 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore fric.ju2m2 kub8qsn(v1 ciy 4van* tion and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = bg) yf xbvbjm/e47aka)sj:b/l k 2; 5n(7wvfj0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction ankabwebl5yb7 vnbg)a m(/ :x) jj74jf;s/k 2v fd the mass of the pulley.)

  A student pulls a box of books on a smoep)f) 2tq ,0wy dqpu 1r54uhxroth horizontal floor with a force of 100 N in a direction 1euqw5x,trfpr d4)p h2u)y 0qof $37^{\circ}$ 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 floor with a force olbiks)u gb8 a.26d s5cf 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 no 2b68ssb.kdu5) c ilgarmal force on the box?

  A traffic light of weight 100 N is support5mpnm)hc ;19hi*e9lklszp k ;ed by two ropes as shown in Fig. 4-2. What are mek*;) h1pls9 h5 mpnlzi9 ck;the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 uw koy3 (/(tfau dw*l1N, what is the mass of the traffic lukd *t1(l uww(/y f3aoight?

  Two boxes of masses m and 2m are in contact with each other on .yghn1nbw2*b a frictionless surface.by.b 2*g 1nhwn (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m arzwljlim2/.rn:vx-: 4 jcg5 e re in contact with each other on a frictionless surface. (See Fii.cx m l4w-rejnv: l5 /jg2r:zg. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are co*fv 7 :vg:naufl/5- z2xutqxdnnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connectingqxln a:5f2 :xtuv/u d*z7g vf- rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If t s)coqz-;s r8the forward force on the more massive box is F, what is the acceleration of the less massozc tq8;-r) ssive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4lfq vhsl 1278)w.we rp-5. B7hv rs) 2lwpf.8eq lw1ox I 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 fcuf4 .:m) 2ciyer v;uqrictions between a 3.0-kg box and a desk are 0.40 and 0.30, respe ;iefc.mr c)y2u 4v:quctively. 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 ypl9-d c1o5gfvg3 6iafor plastic on wood are 0.50 and 0fl1v5-o3ci9 6y dpa gg.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 comd6syu +f hsxd;q)3 9ijes to a stop with a conud6;)syfqh 3+jxisd9 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 surface is psj)/6oo3gg* r) zym 3f2uyhzx ulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the object?) oz*y3ry)3fjm /h gzos gu2x6

  A horizontal force of 5.jy+q yc3n0vkz0*lo- b 0 N accelerates 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 slides 03m;(*r o bsfswnn g3ob6/rmx50 m on the ice before it stops. What is the o*f w/0mos;rgsn6xr 3 b(b3nmcoefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks togbb/ -av5r((,k ngv90.0 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 caravbo5, b- trkv/gn( (g when the brakes were applied.

  Two boxes of masses m andyww0 h4 nj5vh5*h my/u 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rhmh/*v5n4w y uj5h yw0ough. 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 sur:uz /k7 nron+w ,b89yhtht)x gface 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, whaw/8:)hntxung k,yt z9hbo+r7t is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is incli; f/ j 2ro*es4dejev;bned at an angle r;edb;ef/2ej*j ovs4 of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of p6b :ouxwqz 5g:jly7q5,vr q )$10^{\circ}$ 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 angle of:rg e5pngyo* r4*dzshj g9xc1(e9 u8p $37^{\circ}$ 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 +7n6cxeky1xm-a qmb6w 6k.m e 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 directly down an inclined plane, at a constant velocity ofped( tfah*o/a7.y u5h(sqe*s tgl*4 f 6.04e ( ofs d*ehp s/qt5 a7*.*ulafhgyt( 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 down a rouw5 oz-zs6/2fsr(m rr vo:e3m wgh $37^{\circ}$ 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.)-y.1ku1qkd vk zg uy 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 surface. o+mkx1 ozovdm) qj80j/f- r 4x The cable attached to thq/o04oz x -8jov xmrk+fdj1m )e 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 fcc pq 752hnk;erom rest on a rough inclined plane tilted at an angle henq 52; ckcp7of $33.5^{\circ}$ 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 gradually is( ow5p c x+s*a-g;tbdncreased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static fcts-ad5; xp gb w*+o(sriction between the object and the plane?