Which of Newton's laws best explains why motorists should bucklew/ (i( qz9ct.9m:b zddtydz8c-up?

  When you sit on a chair, the resultant force on you isjo8+zd rocrvq mym2;:l1m 0q1

  In the absence of an external force, a moving-hd,w(, m u 0u-7n0ezhsdumh sg6/t so object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turnedaxpj)9.9 t9); r, 8e: bupybklsbujux off, whixt b)u 8r.9;9ueulsa xkppb,)jj9 y:ble traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constantfm+-.thq0x 6vew3n u sdi6pn) speed. It is far from the gravitational effect of any star or planet. Under these conditions, tuwh x66tn )3sfm- +v.ipn qd0ehe force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forwap-lck/d,9np : *cxiwr rd, and you suddenly fall forward. You can imply from this,c d9-* /kxplrwipnc: that the bus's

  You are standing in a moving bus, facing forward, and you suddenly y:sn+ utn8.jbxv u1phyz7: j8fall forward as the bus comes . u+:8yvst u1njh bxny p87:jzto an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describ:jy vvx4 qj0ibt2m0b; e the motion of the object.

  The acceleration of an object is inve6v-ja hj vioiz) )kb/m 1b7so-rsely proportional to

  A net force F accelerates a mass m with an accel)qiq*3h )p++rzw2c zljwf pt/eration a. If the same net force is applied to mass 2m, then the acceleratiolc/qpzt*+2 q p)ww ih j+rf3z)n will be

  A net force F acts on a mass m and 42 rtmz) likm2h es,b )9h*eznproduces an acceleration a. What acceleration results if an slm2e ebr,*t2)hzk h9m4 )zi net force 2F acts on mass 4m?

  If you blow up a balloon, and then relear1fxl gc4 5jj e n 1h,4ejqh*gco4+4ucse it, the balloon will fly away. This is an illustrati+f 4g,1 l5 ecgc jj4u*1re4onqhxjh4con of

  Two cars collide hea r.*ssisp4jr ,d-on. At every moment during the collision, 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 is an example o rssir*sj.4p,f

  If you exert a force1zpyig e4ri, n(0k cvqm eq qt4m,8;:a F on an object, the force which the object exerts on you will; y qp,nt regk0ic1q4,aze4 (8mqvim:

  Action-reaction forcklh3jyh; rde (v:mt,:es

  Action-reaction forca/ x6 qce0z h.z,lxab3es are

  A 20-ton truck collides with a 1500-lb car and )nbax p2,d+ wrj kk5q(causes a lot of damage to the car. Sinc kxpqw k52r ban(+),dje a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object wi. dr0,n kcw0myw qpq7wy/mij; i3p(z3th force mg, w7nqj330 qwwp,(.; kzpyyiim 0r/wmcd hich we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. Thed j4kfn1b m8x20viv (ju6 ;zgex0ukq 4 Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction forcemn q0jubg;kv4zjuix x 1840fke v2(d6 "?

  Your bat hits the ball pz4 llz3i/q, +ncap x0aitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magn+ll 4,zn ci3/xazq 0paitude is

State Newton's three lv+lw:g ytjq 47r,v zs7aws.

  Mass and weight

  The acceleration due to gravit9gonwyj1i ;n );yj*uh y is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon9h;un n1 jjywg);oiy *'s surface, compared to Earth?

  An example of a force whichhz4 l*ki:tlr)n5o+ nic(u hi4 acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a perael +heu us-)(18pieid, amquq 7),puson weighing 600li8 ep)uai+e )uhu(q,qp m,dsu7ea1 - N?

  A stone is thrown straight urz7mkju) cgl6)m h ) 7rb4h/zyw8 nj-gp. At the top of its path, the net force acting on it 6 )- gzzbwjk8yl/hrg )ju7rn7h c) mm4is

  A 20-N weight and a 5.0-N wei(xcfn0b /rzh g/5lit 69/nroi8:o ntrght are dropped simultaneously from the same height. I6rht//zr/ng t 5 (o8ib0flcn oi:xr9 ngnore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velociti(s(obrj d4+ yo3ijz1 yes. Which object experiences the grrb3j1(oyizs d 4 (+oyjeater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. .k2+p gm* :e 3pxk oxw9x/yztk The elevator is moving up at constant speed. What is the tension in the stri wo:kk9 xm. kyezx2p/ *gx+pt3ng?

  An object of mass m is hanging jl asj*-t;s k06s+fg gby a string from the ceiling of an elevator. The elevator is moving ut +a-js jf06s*s lk;ggpward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding oi jp7+1h k*nei4cezt*h86nakn an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is t8cp g iop)txzsb22 63vo keep puscv t8p63z )2x2pg sboihing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface kn bm.93nndcyom/37e (friction is present) at a constant rate. The experimom97n. nyc 3 kme/dnb3ent is repeated, 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 conj5kzs )x i4w gr,ybsb h54:. t*fqwhk6stant velocity. Thus we can deduce thahwby56wshij:xt4r,5 qb*z .f4s )kkgt

  A block of mass M slides down a frictiofp lv0fdi 7a/e7h/h4 xnless plane inclined at an angle q with the horizontal. The normal reactiifxh/770vf d p 4e/alhon force exerted by the plane on the block is

  A block of mass M slid 8hx htv,bs )v4a(/btyes down a frictionless plane inclined at an angle q with the horizontal. The normal reaction fo,bht8v tv )ybsx(4a/h rce exerted by the plane on the block is directed

  A block of mass M slides down a frictionl+3*vrvi9yoe 9iyy 6g gess plane inclined at an angle q with the horizonv yyr+ie*y36io gg v99tal. The gravitational force is directed

  Two toy cars (16 kg and 23j lu nwngc.0994nfhnaj o 9a6.0 kg) are released simultaneously on an inclined plane that makes an angle of j.n4un36 9h g90fwnlon9aaj c 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to tm;m;.(yvrs w-pjj r9atf*cd0 he object, and ij;rp9 -* j. sfayc;tmmr wdv(0t 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. Whatf,0 j:k lf(osb is the average forward force on the :fb l0(ok,jsf car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in k6uhyi f5jc:l7p5. dl2.0 s. What is the net force acting o 57y6uk cfp.:li5hjldn the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s -awu/d/f q(ok xgh;d ;aftguq(o;d kw- a/fh/d x;er 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 0ynqjs:ntnx3 j71el3 the same force that you push a 10-kg mass from rest,1jt jn3n lq03nxsy7e:

  What is the mass of a person who weighs 110zm+(xcj+ ot)tip3n-m lb?

  What is the mass of an object that weighs 250 N on the 20qxeak qu8gd +4txy 8surface of the Earth where the acceleration due toakq8q+dugye 2t 8x04x gravity is $9.80 \; m/s^2$?

  An object has a mass of 6gu.bxg u(( w;j0 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only uwubx;j(g(g. 1/6 of that on the Earth?

  Object A weighs 40 N on Earth,3*rgb0u e-afoh1e ,3nnvq p(s6ob u( e and object B weighs 40 N on the Moon. The Moon's gravity is one sixth oph3arn veo6e1 3ob*0(b(g-us nuqe,ff Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite g xtf2dly)6/je5fqck6 qu)n6(e j3 r oends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward 5f2oncfdeljg j)q r6y/u6 k6(q)etx3Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A form mq:),sy,y+tcp3pqxce F acts on the stack, and it accel,y sptpqyq3+xc) mm :,erates 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 the ;fj 2ozc1y8 i pv5 nkn2 n7yo4/dkxx0lscale be readfvy2on lz n y52xc; i1onx d/0kj4k8p7ing when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the myi+ppfz9ytkfh -, m 4,ass of the person is 60.0 kg and the elevator accelerates downward withhzmy , pifkf9t-,4y+ p 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 of the person is 60.0 lg8ihuz :t oro*4 gka3)cdjcrv*54f8 kg and the elevator accelerates upward with an acceleratioi hzu c*f45 l3jckt 4ra*:8vo)rg dg8on of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One pebshrfhk9 0x s)01k b) 4nxp+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. What is the ack)rsp )bnh x401bkxf+ e90hsp celeration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held o7xi bv,22(kw n.craz:op 8 kzin place by metal brackets that can exert a maximum horizontal force of 9000 N. When the ko cai, nw87.xpbvzk zro2 2:(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 flatbed of a truck.c;e6 (:(wxo ,p,ofid y6ezyn c 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 stoppif yicn:(e(,cd,e6o6 pxzwy o;ng 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 anqukvnu 4sm( o )6*4wcvd m = 0.40 kg, what is the magnitude of tnowu qku*v( 644sc)mvhe acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shownup0b tgdf )p wxiz:w+w(7j(m , in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (,x+u7jzmgt0p ( )fwp wd:( wibIgnore friction and the mass of the pulley.)

  A student pulls a box of books on d; ( tlj6jnoq4m7 vri7a smooth horizontal floor with a force of 100 N in a direcmr jdvont7 ;7(j6q l4ition 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 floor wr6qod8 ;-xz,re q8gj nith 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 g e-jrqr,o8 z;8xq6dnkg, what is the normal force on the box?

  A traffic light of wei a;tdwww d99tjmbz9v 1b*6m0zght 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the row zvb99ztm*a10db wd6jw m9t ;pes?

  In Fig. 4-2, if the tens.4 vc sa(j*ncrions in the ropes are 50 N, what is the mass of the traffic *ra(vns 4ccj. light?

  Two boxes of masses m andat*m8.lndbb2b e (jw: 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the b28dtb( nj*lwab m:e .acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a 0awq6sz;aq; africtionless surface. (See Fig. 4-3.) What is the net force on th qqaw6s0a;;aze more massive box?

  Two boxes of masses m d1n rplp4fs/ hv5c9,vand 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in t/ 49 lvc ,5vfhdnsp1prhe connecting rope?

  Two boxes of masses m and 2m are connected by a rope.3d ,t d1:rttwv6p2zr f (See Fig. 4-4.) If the forward force on the more massive box is F, what is t vt2tr1p:, fwtdz36d rhe acceleration of the less massive box?

Two boxes are connected by a cord running ove; imb6ch gi+x398tqqz r a pulley as shown in Fig. 4-5. B+ 3qmtbc6ix;z89 hqigox 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 frictions between a 3.0-kg boxay000 8jrq3yju8e+ zpk4tsfu and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizony+u0 0akz0rsqu4pejt8f 8j3 ytal force is applied to the box?

  The coefficients of static and kinetic frictio 6u;d l9wihrl.ns for plastic on wood are 0.50 and 0.40 id.rwu6 ;l9hl,
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 ds fd+fzd:s1 g9wwxcm1 u ucgr/4 6x9x;irection. It slows and comes to a stop with a constant acceleration of6msg 41zf 91cfg9x wux wcxdsu:/dr;+ -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pulled /yjzkd:f w *+eby a 5.0-N force. A 3.0-N friction force retards the mo/:ekj ywz *f+dtion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a r5ugpkcw-3a8ccf c* r8w83u ahate 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 slidet, 2 sa lpqzy+,*aoh9ws 50 m on the ice before it stops. What o+,w2p hz t,qyaa9l*s is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police findwb3aoqy(+yh)z9 .dc9cua v4o 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 apwaod y3 9+cq9v4h.cbaouyz( )plied.

  Two boxes of masses m and 3m are sfab)a0mo4zk8qgfp k ;wfh ,b c+o4 )(mtacked. (See 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 static friction force on q( ,kmokp 4hzfab8bo4mgw0+fa) c) f;the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surfi( x.)mgibvrycz (l.q9x;n,p;s1gxl ace between the more massive box and the horizontal surface is smooth and th.mxgb );sll(y(p;z ,.vi r 9qc1ngxixe 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 plu0 4aibmvej+6bsz -9lvl 3ejh3)l r6 qane is inclined at an angle qv9 vr6l3bll hj sj+0eb )63uiame4z-of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an an ;-xbaz3xii- ill+5e bgle 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 wl:/dqi q trcolu.t(23j1/ dnan 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 planehb9akuzx ( +hys9ohnsn8) b:) 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 pphs fdy zp. bh736rx(,+c+rrinclined plane, at a constant velocity ofpchr p7f+y zshx6+, (rr3db. p 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 down3;hr7fv mywzqw 4enl:a5fubz)/1+ cj 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 *4dm/v8 r zzr9yi.qifa 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. alrzg(* u bt .(2xz.8q9udgie The cable attached to the log makel .qx a*dur u2ig8zb(zg(et9.s 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 incll fy0g a2fk(rh21pqp 5ined plane tilted at an angle a105(prfg2hy klqp2f 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 isi/7ih;vc*f*kob;pfy p*w sb/ gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static7y *h;/v ps* ikwo/ fbfcib;p* friction between the object and the plane?