Which of Newton's laws best explains why motorir:x hb-h( 9;a gnz2iq z/7ozbusts should buckle-up?

  When you sit on a chair, the resulmj1kz:lvmy a;ep(7 3wtant force on you is

  In the absence of an external force, a moving objeqbx88l 3u0 fiqct will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned ofg59jcl ohiuxe ,-;ac)f, while traveling in empty space, the starship wi,) jg9o-leuc;i 5caxhll

  A rocket moves through empty space in a straight line with constante8z*+zjggc ygt2 h+z) speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied z *yt ++)zej2zhcggg8to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing fo7c.qc/dexirva6n-:rrj8py ) rward, and you suddenly fall forward. You can imply from this that thepc:x6 y-dj .7qa)rc/ 8vnerr i bus's

  You are standing in a moving bus, facing forward, and you suddenly fall em*ctewr-/hk4p ptwm yk-;8yr 78u x/forward as the bus comes to an immediate sto8y4 c;/ meprk 8r7twt*-xue ym hkp/w-p. What force caused you to fall forward?

  A constant net force acts on an 3 3u ad 6eo u2come8s1mg4ih7gobject. Describe the motion of the object.

  The acceleration of an object is inversely proportional to44veb 3na;wu8 jk g-fk

  A net force F accelerates a mass m with an acceleration a.akq)izg n 3*jpc+rw(0 If the same net force is applied to mass 2m, then the 3 +c) j0ag *ik(rzwnqpacceleration will be

  A net force F acts on a mass m and produces an acceleration a. What accw s qhc);jvo(un6o(p c,j9/ of:m1rrbeleration remc6for:c us1vh(9qoj( rnj;ow),pb / sults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, ttaf+sh x v1;+26hva qshe balloon will fly away. This is fs+vts2qh6xh+1 a v;a an illustration of

  Two cars collide head-on. At every moment during tqm -7qdtgz, (8;fek fghe 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 exagtfeq8 k,gm -(7;fzqdmple of

  If you exert a force F on an object, the p 2v*z+ xtmy)q55 (vczkswxq.force which the object exerts on you wilqz(zy .tcp mwq5)*vvsx+5 k 2xl

  Action-reaction forcg fmqf,n-fbss v)+v; :es

  Action-reaction forcp fiao/ 3u7x s:20w91-csjp 7jxx-* rcqfr muces are

  A 20-ton truck collides wit:qfyz : wp(+zpe;jw)bh a 1500-lb car and causes a lot of damage to the car. Since a b;wej: pwp:fy(zz)+ qlot of damage is done on the car

  An object of mass m sits on a flat table. The Earth 5*n7dj kkfyt;ie .2dlpulls on this object with force mg, which we will call the action force.y.d7tin k*fkj;e d2l5 What is the reaction force?

  A child's toy is suspenckz7gz:6 8o ec69dvui ded from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force,doi7:c u6 8 6gkce9zzv" what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500pa.vtju 4pqzox8*/p3-N instantaneous force. The ball hits tvu ta.o/ppqx34z* pj8 he bat with an instantaneous force, whose magnitude is

State Newton's three i o60. ps;-k/ 6 1gb:fmrpria x1jvcullaws.

  Mass and weight

  The acceleration due to gravity is l r)vopu sxv 70)9:i4lqcgl0fwower on the Moon than on Earth. Which of the following is true abouc 07foiv ll9g:)uw)0srpvq x4t the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dista39zid0qyq +nye: lm-dnce is

  Who has a greater weight to mass ratio, a person wei57h 8 l31nzwbk bldm9eghing 400 N or a person weighingknw9l 38e7hm1lbzdb5 600 N?

  A stone is thrown straight up. At the top of -;5b dgkw)bva0l1 a9w hxa+vyits path, the net force acting on it +5-1x k9adwa vh ylbg;a0w)vbis

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same height m:t/c-2tqu pds 8/oy +odxi8l. Ignorex8:dcqp+y oudtm t//2-l8 sio air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at theimf *lsex8 n4x8r respective terminal velocities. Which object experiences thexfx*8msnl4 e8 greater force of air friction?

  An object of mass m is hanging by a string from5y g05mvcd5g y- c ybq4p.+x0ejricz - the ceiling of an elevator. The elevator dv j5 yyg m-+ezxig5.qcp4-00c r5bcyis moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of;r0lrqj26q)g td r7q ff0qmt 6 an elevator. The elevat0 gf qf jq2d7rlrtq0) 6r;6mtqor is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on s2zq s7 1o ls9zaud:j+aci q0nm,l.5h an icy sidewalk is

  It's more difficult to start moving a heavy carton from r5uh0 e r*0cxghest than it is to keep pu*h0 r5x0h cuegshing it with constant velocity, because

  A horizontal force accelerates a box from rest across ykukz 5gxf9:: a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditixk :u5f:z9ky gons 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 constant velocity. Thus we;vhv0powk+ )ygn,sd) 9: bjtj vsk/v1 can wkbys;nv 9 vj:g/)vvp,sd)+ojkh t10deduce that

  A block of mass M slides down a frictionle7k. fbp3m)9w8oc/gjhxvb b e 8ss plane inclined at an angle q with the horizontal.bgjb78owbvhp)c 8kx/m9 fe.3 The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q u rxir(d30sg -with the horizontal. The normal reaction force exerted by the plane on the block is rd (03u-xrgsidirected

  A block of mass M slides down a fanj w9tn:x j c+ .xk(a l28wvuog2q(,urictionless plane inclined at an angle q with the horiz((9l an8gw2q+cxwk not.,v u2:jaxuj ontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclin 5k dtrg-,rvo-ed plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acckrt-,d-5or vg eleration after being released.

  An object sits on a fricjkju(2,iu v:vp/r-b ytionless surface. A 16-N force is applied to the object, and it accbiuyk(uj,v2r /p v:-jelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 100riy wb91gb6ksp)7 6il0 kg can accelerate from rest to 27 m/s in 7.0 s. What is t7l rwi sk16g)ypb9i6bhe average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Whatk/h y omueqp mgo09;96 is the net force actinge q uy m;m9op/6h9g0ko on the body?

  An antitank weapon fires a 3.00-0i q9- 8 ,fyk-rilxejlou (hv:kg rocket which acquires a speed of 50.0 m/s after trav,oekyrf-0x -ll9i8j h vqiu:( eling
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 force th4a lyp n7om3nzj4*3 xhkct +g8at you push a 10-kg mass from rest8a* 4m3jnk+3nyl4zpcxg tho 7,

  What is the mass of a person who weighp 7z6f la6dqsohu 5ps92p(o8as 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Eajahn5pg( ch ( 5f/ci)xxfl v,uh+ 1r/irth where the acceleration due to g lax fh/j1(i)5n ,cug(pih/fhvx +r 5cravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object of n up /(aozbb,ko2e5.n the surface op(n e b.,2kuof5b/zaof 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 weighs 40 N ag: n -nd.r ioz*b5a4aon the Moon. The Moon's gr b.a:ria-zd o*gan n54avity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by z4 o ssk+wpfrd ;+xssg ;7rc1esve20:pulling on opposite ends of a 5.0-kg rope. Sue p4s+ e7c x; 1 skssdv0zp2:;rforews+g ulls 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 level fricu9 y3ky8u2i rwtionless surface. A force F acts on the stack, and it accelerates wu9yyi3 82rukat $3.0 \; m/s^2$. 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 k4p 7 lbl(gse .:aynku( c*k,gthe scale be reading when the elevator is accel,g( (kup bgny4lael :k.*k7cserating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 6 32u5zvs.twc*v5 y s4;+8b mz/gazohvn o0ohp0.0 kg and the elevator accelerates downward with an accelc op/g0zssz.oma5+8v hv 2bnzy45o;3thu w *veration 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 persol);gp3asvec/k2p8 33d utnlwn is 60.0 kg and the elevator accelerates8dew2 ;p al3uvtc s/ kl3p3n)g 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 force has a3ps )d .m7bhznrffp+. magnitude of 8.0 N and is directed due north. The secof zr3p ) +.bsdm.7nfhpnd 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 on the flatbed of a tru4jdn y*enxi jm xz2-a/: n*rb2ck. 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 inj:/da4b2zr 2m*x- nieyjxn * s not to slide forward into the cab?

  An object of mass 6000 kg resu/ wn61ykzab;1 q 9x5 nalgf/nts 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 fuzx ybna a;6 wlqng5n1/9 k/1truck 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, whi*xuqep c(f44)erw4vxf)f w1 at is the magnitude of the acceleration of the system? f f(wewer4)cxq ip* 4vux1f )4(Ignore 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 ktwk8f)/lj p1t algp-n.ow /)hg, what is the tension in the string? (Ignore friction and tnwgp wl)h/pok )-.jfl18t ta/he mass of the pulley.)

  A student pulls a box of wob )+(may 8f :kn ;zkx,ds8a.vcwjv4books on a smooth horizontal floor with a force of 100 N in a directiwav ak;m(nwb 8fsx o)zvy+:,4k.cd 8jon 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 witt3 5nb xja8wh,-kx(xb h a force of 100 N in a direction of 37.0e above the horizontal. I(ahw8k x b,b-x5t3xnj f 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 as shgc3 ;s(km s q 551ccr5hcq 0w(4wugrhzown in Fig. 4-2. What are the tensions in the ropesk5 c5wq 4;cq(r(mh5c1 sg whg3sc uzr0?

  In Fig. 4-2, if the vbd e;g bj1/mqm4u,b /tx)tz*tensions in the ropes are 50 N, what is the mass of the traffic teb) m*gmx , 1j4qu//zbdtv;blight?

  Two boxes of masses m and 2m are in contact with each other on a frictionl:frsl/ vi ryye7j+eo5r5z5.v34gi lness surface. (ie. vl r 4z5j:7rgflyeir 5o5/3n+ysvSee Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each ot-ri2agx wg zb7y4m.mo )h+;z uher on a frictionless surface. (See Fig. 4-3.) What is 2 o7+z;by a-i r4.gg wxhm)mzuthe net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fi+m5 e 8oa8ghegg. 4-4.) If the forward force on the more massive box is F, what is the +8meg8 e5aoghtension in the connecting rope?

  Two boxes of masses m yu(/s t x)5j9r/ari smand 2m are connected by a rope. (See Fig. 4-4.) If the forwardr x59mrju/ a/syis( )t force on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connecluwdrb9d at0: or /61 gkp-uo3ted by a cord running over a pulley as shown in Fig. 4-5. Box I of ma kdb1ru3t0:d 6oluopgw-a9 r/ ss
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 0(r 1 j5qqq r-aiyfa-l9imz5 f3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on(m i q fzj5-10raqi-qfy5 l9ra the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wooddu69*umw vu *u are 0.50 anmud vuuu **w96d 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 vlkx 3relw 8 i;wx,ka6sm66r7ql2 6m zrj ,gq3the +x direction. It slows and comes to a stop with a constant acceleration o2m zrq ww7mr g,r36 6jkx kv;lx6saqll8,i36 ef -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pul xdrz07w ajyomt fr;o53l:m/0led by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the ozw;7 x dor0atrml/ 03:mf5jy object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from resu4 q)tg;*zrvg t, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game cyiwg,:us3g /, a puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficientu3cg s/wi,gy : of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, policefnlcp)6 /9mt e 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 conditions. Esti9l/pcef) mn6 tmate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stackcbwa)1a87c ssx bim);ed. (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 ;xbbcsca 1a)m i8 ws)7massive 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 betfugzsz2pd ub71,2iqob:,jo. klr d 5+tu;)vsween the more ma;j,) uz5ts brg iob2uz1+ u:qs 2f7ddvl,o.pk ssive 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 coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is4)fh.umw,6 phajcr7ak*iv pzr /j . )m inclined at an angle of*rja)wrzv7 pc/ kauhj4 h6f)p,m..mi $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flatq2b5m 6cmd.v i 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 incli5xksby s ua( g+579bzpusx8,qned 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 pzjv:f vii .-9pde8wfwj, m) r;lane 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 constanth gw kz1)(u( .zn6nqhuf k(4k; ky.gfs velocity of 6.0 m/zgnf(y.zqs(6g)1n4 u k kw(hk;f u.hk 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 dy ,c b3-xmswa(cejk(gei o362own 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 masq2x6b:9zus 0/msu d gds m slides down 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 8efcj v6q xa-0e* 4sfiN along a rough surface. The cable attached to the log mak6ex8acf0fqvisj4 *e - es 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 inclined plane tilted at an angle6z n4i31q fkvg ofki gqn4v z361f $33.5^{\circ}$ 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 aniy *1v0q ;fbdb inclined plane. The angle of incline is gradually increased unqy;0bf* ib v1dtil the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?