Which of Newton's laws bes575v1uufm7 e,n7c y atzbaj0ot explains why motorists should buckle-up?

  When you sit on a chairok5(t7h id)xi , the resultant force on you is

  In the absence of an external force, a moving ibtk fba0ni 1vk/ t-*,*f di0uobject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned off1k1epl/v8f gb, while traveling in emptyk11gpvbel/8 f space, the starship will

  A rocket moves through empty spajcl, kis. ls(v23xh8jce in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Ull38k2hji,. jsxvs(cnder 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, facing forward, and you suddenly fall forwarvc4 mtz 68)/vaampg+pd. Yoa64 mm za/tg)v8pcv+ pu can imply from this that the bus's

  You are standing in a moving bus, facing forward, and yo*-du ex cp.gy,u suddenly fall forward as the bus comes to an immediate stop. Whatu*pd ,- gc.yxe force caused you to fall forward?

  A constant net force acts on an object.. zmvmye z skmh:+1)f9 Describe the motion of the object.

  The acceleration of an object is inversely proportiogo;g2aksj5,x ak og50nal to

  A net force F accelerates a mass m with an accelerat9 ns4e;-etk x5+yezlf g*qs72nixx j+xuhu0 9ion a. If the same net force is applied to mass 2m, then the accelej 4e sgxu*kh0n+7;9u+ ft2esn5x eq xyzli9x- ration will be

  A net force F acts on a mass m and produces an acceleration a.l6mli x mn-s mx5aguydt9-on* )k/y1; What acceleration results if a net m1- u o*nlk- 5n)9myxx;asydlmt6g i/force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly 30yuayhw e o0w mnr;o2x.w/ry,* wdv 0away. This is an illustration ou.dmwye;0,yw row2vo/yan0h rx* 03w f

  Two cars collide head-on. At every moment during8vu wd n1p5 con)ho(j6 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 )8jodnn6v (wo cpu1h5 on the first. This is an example of

  If you exert a force F on an object, the force which5-gun/oer hph2co1xx4iwb3h1 o7*t g the object exerts on you wi-opxobh*irwu n cg/ ho4 51g1exh 327tll

  Action-reaction forcss .h2ex6yv*33p uohhes

  Action-reaction forces 2fecvgp *wn)o1+n*fkmud8 0w are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damgu5vea0nq 6l (mnilpz ,7g /n9tliqabo8 h6.8 age to the car. Since a lot of damag6lz upto bn067(vqali a. n89lqih85eng ,mg/e is done on the car

  An object of mass m r1c h ylcl0(7isits on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force li1h7cylc0r (?

  A child's toy is suspended from the cei27xej.9k-0(3 opg wuc i bdtyiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If thisugd b3woj(-0xie7iy k .tc29p is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 150cj -i.s1igll wu*e.n3b z42yl0-N instantaneous force. The ball hits the bat with an instantaneogi-n 3 c zllb1js *4.i.2eywulus force, whose magnitude is

State Newton's three lawuak,g,dvh , z: dmmaf*./bnzd 3r6.uvs.

  Mass and weight

  The acceleration due to gravity is lowe 5jbo 00+y(ceced1e qfr on the Moon than on Earth. Which of thbjoe15e eq( yc00c+fde following is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts os88 e4z3ea,1 rrkjpeat a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weig(m)gx-6ydfx ahing( fa-6xyxdm)g 600 N?

  A stone is thrown straighz q64 3f(qn i+(njpexxt up. At the top of its path, the net force acting on it xipf46q (nenx(qz3+j is

  A 20-N weight and a 5.0-N weight are dropped simultan/gfif .r8 jh6g a2oy4teously from the same height. Ignore air resistance. Com af2yro4./ft i6gj8hg pare their accelerations.

  A brick and a feather fall to t fmj92.9rv ftvhe earth at their respective terminal velocities. Which mf9fv9tvr.j2 object experiences the greater force of air friction?

  An object of mass m is hanging by a string fr*bhgph 8tp0*x om the ceiling of an elevator. The elevator is movingp 8h* *bpgtxh0 up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceili4rk* e,b c(m8dvx7e wyng of an elevator. The elevator is moving upward, but we (8rbm*7v ycd4x e,kslowing down. What is the tension in the string?

  The force that keeps yg9lpafb*f* h*ihwn2 -3oq1dd ou from sliding on an icy sidewalk is

  It's more difficult to start moving a 38) xg avqhy.gheavy carton from rest than it is to keep pushing it with co xvg8q )gha.y3nstant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surfac.ejn1u, u4xj n5*hydre (friction is present) at a constant rate. The e *eh,uynj4run 51x.djxperiment 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 slidw+n e2 cp9os/ves down an inclined ramp at constant velocity. Thus we can deduce thwp9 evs 2n+/ocat

  A block of mass M slides uphx5f 10x/n7ecc; ao down a frictionless plane inclined at an angle q with the horizontal. The normal naf;5cx/e p7 1xouch0 reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane i)3dxw 0n1kqe zzkq3)e nclined at an angle q with the horizontal. The eq33 10zqxnkk)z edw)normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incq9p8 -iiw8n0g2b z4cnmjkf+k lined at an angle q with the horizontal. The gravitational forcgck8nqi24n p8kfm+ zb- 0jiw9e is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an xbsslo,+wz *:inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their ax+lws:zs ,o *bcceleration after being released.

  An object sits on a frictionless surface. A 16-:yw9 d+kx5(t5qkk3 0 nnuypw6i x(nv yN force is applied to the object, and it+n3xyk q p(i n yt0d956kx (uwyw:vkn5 accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate ybgv .nl1v9bym1 43ghfrom rest to 27 m/s in 7.0 s. What isyv1bb4nmg. l1g 3v9y h the average forward force on the car?

  Starting from rest, a 4.0-kg bodyfcclgew;p/ apu +z;w; .x /fz4 reaches a speed of 8.0 m/s in 2.0 s. What is the net fo.p4;fe fg/cauw ;+zxc l; /zpwrce acting on the body?

  An antitank weapon fires a 3.008)k*qgkvx;t 5g;lv 5jx hb1ug -kg rocket which acquires a speed of 50.0 m/s afth5 x) klqgg ;8;v*bujx v5ktg1er 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 the same force that y/cvo zeh9 0))ao u;mrsou push a 10-kg mass from rest,e0oar)h /os;mzcvu9 )

  What is the mass of a person who weigqx u0::v +nabuqfwh 62hs 110 lb?

  What is the mass of an object that weighs 250 N on the surfp,b*d b,ap1-v9bgmlk kiv33o ace of the Earth where the acceleration due to gra ,*g33,-bpko ba vbp9kmid1l vvity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass ofkxdrh,n2hi ;:itz, ;m the object on the surface of the Moon where ;;iitnh dmh r,2kz,:xthe 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 t /2yao( *ykmqp +del.yhe Moon. The Moon's gravity is one sixth of Earth's. Compaydy l pm+* koay2e/q.(re the masses of the objects.

  Sue and Sean are having a tug-of-war by pull ia6n:ssu.q p3gxh+2bdkw +h* ing on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope akh :xgnd h .w+s 32*qsip+ub6accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts on(jkm /mo7b wr. the stackm/ bw7 (okm.rj, 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 scale in an elevator. What will ebg0,g,4dg ,c4 yrshj:(jz elthe scale be reading when the elevator is accelerating downwarc:g ( h bje,jglsg4y,zd04e,r d at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the pe-h kyghx gk* dg;q9)04n n1:of2zvb+mgq6f gwrson is 60.0 kg and the elevator accelerates downward with an accelerationhvg;1zn0 2 qkw xmoqfg4fkd)bn*-g9 y:g +6h g of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. 4b :*sn3:u(aa-fh f ysifwl9o If the mass of the person is 60.0 kg and the elevator accelerates unf-f fa s4yb3 9aw:oulih: (*spward 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 a magnitu:(eldjhl6l( ts 0cob5de of 8.0 N and is directed due north. The second force toward the east has a magnil(0ljsc o:thd(6el5btude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in placek z-vt3i5u5dxn 0igp* by metal brackets tiuzvk*ig -x5 530t npdhat 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 to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed 81 am(scmw; 1mue4liv of a truck. It is held in place by metal bracke(uce 4;s1lm a1m8 mwivts that can exert a maximum 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 ; mw* 23fss5(djvxnfq kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frj f v*2ssxfn35;dmqw( iction and the mass of the pulley.)

  In the Atwood machine shown in Fig. dywqlcwd/4vh x+0n +a nzu+t um630t64-1, if M = 0.60 kg and m = 0.40 kg, what is thdax0c+ + l+6 3/4mvn6tuu0nw qt yhzwde tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a rpk; nkcr/3ej zo.2 pa2.xl4rforce of 100 N in a direction pa /z.rr2ex cn o2pkk4jlr;.3of $37^{\circ}$ 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 -48kbs ze l63j3bwulsbooks on a smooth horizontal floor with a force of 100 N in ak3l 8s bsz3u4bwj6l-e direction 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 as shown in Fig.d i ;xzrq7mr6a-a09 f8dxm;kp 4-2. What are the te mz q;r6r-f8 kxa;dx7m9ad ip0nsions in the ropes?

  In Fig. 4-2, if the tensions ivylkbecl 7ca7j-,18yr d *v+un the ropes are 50 N, what is the mass of the traffic ,-*j uv 7d a7kye8+ 1rvclylbclight?

  Two boxes of masses m and 2m are in contact with each otherr.jmak 2-g-ssesn/w-ap 14m f on a frictionless surface. (See Fig. 4-3.) What is the accel- mnms4sa/-. 21jsr-e pg kwaferation of the more massive box?

  Two boxes of masses m and 2m are in contact with ea qkg tz*j)1j;kch other on a frictionless surfacekj;qgj1tz)k *. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m at8;) nrnpf+wxnd 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 the connecting ro x)n;tr wp+f8npe?

  Two boxes of masses m and 2m are connected by a rope.+atlp;qcce )i,9m20 fs wnj1o (See Fig. 4-4.) If the forward force on the moret;q19 ec+sa0 mp,oc ilfnj)w2 massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a1 ih1t9;+co ydouhsy6 cord running over a pulley as shown in Fig. 4-5. Box I of massc 1 6t1yooiyud +9hhs;
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 box and a d6 9qzl,sq czme7p a7 s;l*g1fvesk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is q leq1l;a s6 p9cszg ,f7z7mv*applied to the box?

  The coefficients of static and)r,k v3a.b(bh kqdu em h s+d4.)e.mi)ieq(ui kinetic frictions for plastic on wood are 0.50 and 0.40 ikue.ved ) ui .+m q4s(ebk3d(i har,mb)h).q,
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 thedg )-ou(3ur tr +x direction. It slows and comes to a stop with a constant acceur - go)(tr3udleration 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 i9): (mcrf fcga horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is tf)crg(i m9f:c he acceleration of the object?

  A horizontal force of 5.i rzz379r6jd3nni:ug 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 slidyc/c;uxg.gk c6vs-z 3es 50 m on the icekg;x-6v cu/ z.s3cycg before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accidengadm.u,m f;, m*vila8t, 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 condd.; ml*gf 8mv,uimaa,itions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m andydp gcln+wze:9 e(kv3f9:c 7d 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surd lce39nwgf + z:ycvdpe9: 7k(face 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. (S2q0ug3n(6 p 3j1orpqn.ngpm kee 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 coefficient of static friction between p .g(0p 1 njq6omqk3rpun23gnthe boxes?

  An object is on a frictionless inclined planh v5n/0n*kf ves:xgf/ e. The plane is inclined at an angle of :/ 0fnfkns/5x h egvv*$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill thtm3hgtiq4 p.f( 3keh +at 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 inclined plane with m,aegx*+ qknb xg (wl:w*y- g5b)lv2x7kj-lh 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 llpw:5 0xc8uv inclined plane 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 slide hra*l,9ivbv2 s directly down an inclined plane, at a constant velocity of 6.0 m/ v2,ir*havb9 ls.
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 d;5 lqb:uv+ o-yq)tnwmown 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 rouh(zl3j;svxy+a rflc0x2d6o + gh $37^{\circ}$ 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 surefq dp k:lo2-m8 kj7mfy9(tcvs j;( q(face. The cable attached to ko(;qmf:qct(dj 2-lpj9(mfky v8e 7sthe 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 rough inclined plane tilted at an ana) 5fjf+c pec3glecfa+e p)cf3 5j 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 n asa+d0kg ,a( 8tlsnk;: k0eqinclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the g; 08kls ,as0deknq+k(:tnaa coefficient of static friction between the object and the plane?