Which of Newton's laws best explains why motorists should buckb2mm3lb; 6ccd(c il)zle-up?

  When you sit on a cha ff3f6b9ve( ;hrpamf iwa6::i ir, the resultant force on you is

  In the absence of an external force, a moving *hngpqdodt-js crm -91 6 un91object will

  When the rocket engines on the shmm9vi4ivs( 3 r34 jqjsn /9uptarship NO-PAIN-NO-GAIN are suddenly turned off, while traveling h4pj3 m i9(jmniv9r/s34 vusqin empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. It ipzy df(:5 4gnh hz1txj1.7r1 wrkc*xys far from the grx .4yk7z 5h1prg :j1 xwytzn(dc1hfr*avitational 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 moving bus, 2/2 glwkilwo - w4;djefacing forward, and you suddenly fall forward. You can imply fromje-2/w2;olkw 4 wdigl this that the bus's

  You are standing in ae tki4v(z0pw+rz2z s 3 moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediavrw z(+sz ziet3p 4k02te stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the u:ji2; ywwkon m5u+p,eaz j/; object.

  The acceleration of an objfk7 kj .3nn4geect is inversely proportional to

  A net force F acceleracaiqqah j12*; tes a mass m with an acceleration a. If the same net force is applied to ca qhij2q*1;amass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What accelerat p+qjf4 * ,an)wvfok 8skexqq:db+ c)(ion results if a net force 2F acts on massnew4:q )o8fj v *q++ka,k(qdc) sbxf p 4m?

  If you blow up a balloon, and then release it, the balloon5,dl(xg*q:fcxn lv,q will fly away. This is a: ,clqvfnlgx 5qx(,d*n illustration of

  Two cars collide head-on.wlj)m la(o08qai6 y5j At every moment during the collision, the magnitude of the force the first car) ( 6 ayj0mollwj5qi8a 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 obje.jf5 ) b vowiuias;aj/2v7r)sct exerts on you wijub afw /v)v; j .os2is7air)5ll

  Action-reaction forcesb.te69m 5qzu5g ensf; -qp, se

  Action-reaction forces)124dz lp j7zy:d f:ps sah(ek are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damf6exh2ea hz 21age to the car. Since h12h 2xza6f eea lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this obje 4w7uk pp2ags*/4kr*aa ,;1petlyyywct with force; gupt*ea p k,/*1yrywwa2y lk44a7sp mg, which we will call the action force. What is the reaction force?

  A child's toy is suspenden(o u 25*:pi ls+fmgchd from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0i n( cmf5+*2h:pul sgo N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched tolccq o v*s dm1)br6dxq+ua9;,l nz8 j9 you with a 1500-N instantaneous force. The ballcoqcl9j sd+ xql u;*6avmd9n ,)rzb8 1 hits the bat with an instantaneous force, whose magnitude is

State Newton's three lbme 7b6m )4jldz51pcfaws.

  Mass and weight

  The acceleration due to grasd-o( 8wscb9yr7k* asvity is lower on the Moon than on Earth. Which of the following is true about the mass a by*swckss -9d 7o8ra(nd weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance is0g2/zc,yk wiw(nnv ;m

  Who has a greater weight to mass ratio, a person weighing 400 N or a person wensv b,3vepi e;h,x/u( w4;fffigh(pie, f enf4v;3;u, xf/vswhbing 600 N?

  A stone is thrown straight up. At the top of its path, th vdakubz3vfv. q8*2 qs b+5bm)e net force acting on it ifbq uv )ska.*vb3 5 zd+q2vb8ms

  A 20-N weight and a 5.0-N weight are dropped simultaneously frotyul/l;-w j- g oo0nj7m the same height. Ignoow-/uyljj gl07;o n-tre air resistance. Compare their accelerations.

  A brick and a feather fall-uyl0wk:za u3+ f.w avaq7hvl mx.z3 0 w1o3ha to the earth at their respective terminal velocities. Which object experiences thezk 0uxl 1wl+0wvav.ayuo3.a:f-h wqm 3ah7 z3 greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevatoi3aal jn*0aa4(sun 2l r. The elevator is moving up at constant speed42n3ai aj*0a ln( luas. What is the tension in the string?

  An object of mass m is hanging bq9 kga9ad3u wr2x h04 mbjw389 tjsxj3y a string from the ceiling of an elevator. The elevatox 2 mujksd4tj 9rwq9 j3x33a89bw0 ghar is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding c2iah psx,imq+i4-psge:76 qon an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is r*z6 l 1c00dxycch6dlto keep pushing it wid*d6x0 lz6 c10hcrcl yth constant velocity, because

  A horizontal force accelerates a box from rest 1+peb f,wh/eebsu w./ across a horizontal 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 happens to the box's accele.s ,/p/w+beewuh1 efbration?

  A packing crate slides down an inclined ramp at constanthk e2h9:mc0 dq velocity. Thus we can deduce thcd0 :2k9e mqhhat

  A block of mass M slides dowj2wtxcx m :)pf17rm5;b t0 u9parzksorf5-. in a frictionless plane inclined at an angle q with the horizontal. The normal reaction ff.z wromp ctxfr7:25ka ) b01rt;i95uxjm -psorce exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined ago1lwcp.3-(n yd d, e9ivrqz2 t an angle q with the horizontal. The normal reaction force exerted by the plane on the block is directepi,d9co1dqeg.r n 3zyw-v2 l( d

  A block of mass M slides down a frictionless plane inclined at an wy3;i uj2z .xooi*d.l angle q with the horizontal. The gravitationa u 23z.dlji.; yio*xwol force is directed

  Two toy cars (16 kg and 2.0r0ziiznh;q-:i q o.uk: lb5ie7 : y+dz kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement whi r izylhbk 0ziio-.7q:zq e:5+in;u: dch best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appc35v e)+poo rzlied to the object, and it accelerates+coz)3 rpo5e v at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 10qs,juwhb;p *r;wa+ u300 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average +uw3r* b;;aq,hswjp u forward force on the car?

  Starting from rest, a 4.0-kg body reaches l4r h5nl24bjd a speed of 8.0 m/s in 2.0 s. What is the net force acting on thebj 5 4n4drll2h body?

  An antitank weapon fires a 3.00-. rneeo :w5sf0kg rocket which acquires a speed of 50.0 m/s after travelwe0: o5.s refning
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 sagj08 db ; ea2 sosg17(kbxsvl/me force that you push a 10-kg mass from restb8dok a/v1l 72 0s(sgsej b;xg,

  What is the mass of a person who l x(kxt3t/xy f.nya, ;weighs 110 lb?

  What is the mass of an object that weighs 250 N sw3; 3.0 wsso + vehsqjay:8bton the surface of the Earth where the acceleration due +b0 3e8.ha jysswqws;otv s:3to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. Wha bk(4 h.pmt fdsh.l65ft is the mass of the object on the surfaf.s5 d hlmht(. kbp46fce 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 /cpma9sjsn 6aqtuetx(a,1 k;+qv/ ld:z.w( cweighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare thct/t1: ea+9 kwqp mqs(xs/au6j nz ;(d, vc.lae masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on oppositeyavy 9n m2 k5fmh0g-2n ends of a 5.0-kg rope. gy 092n2-km5mvanf hy Sue pulls 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 levtw/yf d,+t qy,of;-s zel frictionless surface. A force F acts on the stack,,t w/y+fo;-qsdftzy, 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 cucm ) y6p.udie (+pnnqf7c3zp 6e/ e+scale in an elevator. What will the scale be reading when the elevator is accelerating dow(ep7+cizf pepcm 6 ue)d /c+n63 .qnyunward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. I7a*ice.rt h9 *zbb-oif the mass of the person is 60.0 kg and the elevator accelerates downward with an accei ozr*ahe9t bib-7c *.leration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rbexs o7mxzl,+h 9gni0dfd. **ides in an elevator. If the mass of the person is 60.0 kg and the ele+7.b9 h0 dnximog*es xlfd* ,zvator accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a e:sw3n *h1. pv iivmcmga;)qnhc7+d55.0-kg mass. One 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 i.5mqh hwdc1:s3gvv+ e)p; n*i 7 nacmN. What is the acceleration of the mass?

  An object of mass 6000 kg rests on t 2i nxs5ev83wjhe flatbed of a truck. It is held in place by metal brackets that can exert a maximum horw5e3 in j82vxsizontal 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 forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a try .m3ka71j qc v,shw.ns4z,x fuck. It is held in place by metal brackets that can exert a maximum horizontal force o4y1 cwxk qm .vjn.hz7,a3,fssf 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 = 0.40 kg, whaxtb //rvx 7(*0z;qux 4 zhtncit is the magnitude of the acceleration of the system? (Ignoren vt0rxu 7(x*/z4thq zxcbi/; friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 p.h,kq 0vs kj*kg, what is the tension in the string? (Ignore friction and the mq *.jph 0,skkvass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a forcez2 4y;i csvuq* of 100 szu;42vyc i*qN in 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 o71kb hhev,pxix .f/f4f books on a smooth horizontal floor with a force of 100 N in a di7f e 1.k4h,fb/ixx pvhrection of 37.0e above 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 supported by two ropes ad v3r8f * xn3tu5dhkc8s shown in Fig. 4-2. What are the tensions in the ropef * 8uxdkdch38rnv3 t5s?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the t;a*,g (ebbv8sqw9ia+ 8qoky- oub b(b raffic ligh8g(- o; b bkwq8qu+ebvaabbo(i s9, y*t?

  Two boxes of masses m and 2m are in contact with each other on a fx32mtj8e6 s71 o byswarictionless surface. (See Fig. 4-3.) What is the accje a2tby1 m783 6wsxsoeleration of the more massive box?

  Two boxes of masses m and 2m are in contact with eaco 9x7(y :ppa1yy7qke hh other on a frictionless surface. (See Fig. 4-3.) hxp17 oyy:py7(k 9qa eWhat is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See ;v-dxye*:qifnro/) p i5 j6 byFig. 4-4.) If the forward force on the more massive box is F, what is the tension in th ;nypi5 6jbd* xvrif):y/e-o qe connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) tl+a i,b m+kx;nb p. pgas/by2-mt)3v If the forward force on the more massive box is F, whpsb++-,mab .;lmt2ngpvx /t) 3yab ikat is the acceleration of the less massive box?

Two boxes are connected by a crw81;ypp cd:o ord running over a pulley as shown in Fig. 4-5. Box I ow 8:c rd1;pypof 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 staticq3 o6h y8ai.yw and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respec .a3y6wqhyio8 tively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kigczh8**fr sluam 554g netic frictions for plastic on wood are 0.50 and 05c*a u5 lmrzf4 hsg8g*.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 sfdk yrw81c0(r:+ l zneurface in the +x direction. It slows and comes to a stop with a constant z8(d kr1l+rw0cnfy :eacceleration 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 hor)rcv2o92cim v cuve 1:izontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What isov:c2vimr cu)c21 9e v the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg m)u hy,wfurp2c 2,f:mlass, 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 065vdtqvmmhwl* 29b r initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficildv rqvt2bm0 6*95hwm ent of kinetic friction between the puck and the ice?

  During the investigation of a traffhx,t4 9 mho5g a4. p,kdhx2vwnic accident, police find 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 condit,mn,9g 4w4k d5hox. p2xtavhh ions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are8yzk ,ur(4damj; wg wlg--p 8bs/-syh 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 rough. If the less massive box does not slide on the more massive box, what is the strw g- z 8j (h-g;k,d84mu -lssy/baywpatic friction force on the less massive box?

  Two boxes of masses m an+ut j;ebw u(2jd 3m are stacked. (See Fig. 4-6.) The surface between the more massive box anjuj(;w u+tbe2 d 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 inclin4*7fyj :1riyl h2awg ged plane. The plane is inclined at an angle i*r2hwy g ga1lj:74fy 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+vf b vp:k we4xd c;;il,hg6:igle 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 angle ofe.myvnksicl89fj+ z +8 r5unnfz0,(f $37^{\circ}$ 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 an n/ b1 onfll)m)7k53bp x3dr:xbgse +xgle 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 i.n kcq*jevaiy3u 59ax3, jy1unclined plane, at a constant velocity of 6.0 me.uu3ikj95 an*qy 1c vj3a x,y/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 sli *ud2zxcb8 sa)des 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 down a 8w4z eiihx uy6p2p+;prough $37^{\circ}$ 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 surfak*(17u qqka qg+-f2zdu mt7eqce. The cable attached to the log makes an angl7f* -uqquq2a ke (1 +zmkdqt7ge 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 rele t5d n99 ry,sezkm,(vlased from rest on a rough inclined plane tilted at an angle o ,9 l5 k(yn,ztrmsedv9f $33.5^{\circ}$ 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. T-wc/oj3co gq, )o(j mztiz,4n he angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and t3j4g( oztzo /cj,qo n-,wi)m che plane?