Which of Newton's laws best explains why mot inz ,)w;z l2pl2:fwpcorists should buckle-up?

  When you sit on a chair, the resultant ye3km w 6uy-w3force on you is

  In the absence of an external force, a moving object 3 m cqkpo8,,yowill

  When the rocket engines on the starship NO-PAIN-NO 27n+buvo7kcajnn )+u-GAIN are suddenly turned off, while traveling i2n 7+knc7ubau)v+jon n empty space, the starship will

  A rocket moves through empty space in a straight h j,73fvyn z4jline with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its m4y3 ,hn fzj7jvotion is

  You are standing in a mvqjij .59 5:f7,t9l6jdid/tjs qysryoving bus, facing forward, and you suddenly fall forward. You can imply from this that the bus' jrdsqf9 di/ y .v,isy7 t95t6ljq:jj5s

  You are standing in a moving bus, facing forward, and you sud0 k1zgx.tob7zx9wa4o;j st:o+,new rdenly fall forward as thebg9rtek4.o7nx ox ,zz:tsojw01w ; +a bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion ofjl o 6yuo-mig7;b0h+ nteo1)o the object.

  The acceleration of an objj lqu8k7e*u: m:1hdqf+ b:flw ect is inversely proportional to

  A net force F acceleratepb cpx,nsjw2hh4fd)s m;.p3f:( n 0ths a mass m with an acceleration a. If the same net force it0 j4xs3pnnhdhh.ffcs2p ;m)b,( :pw s applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces l brr6e; 6h6 mvbdy.5,c(stf dan acceleration a. What acceleration results if a net force 2F acts on massdy.rr lb;6s6t,5f ve6( dbcmh 4m?

  If you blow up a balloon, and then re 9a6d26mwg5j1 f*zv/ rb80 hgdjtgorulease it, the balloon will fly away. This is an illustrationg/*61d9t2vajw uj m05hbf8g6 odzgrr of

  Two cars collide head-on. At every moment during the coljet5x:qk(0m p;k(uo n5 )yiszlision, the magnitude of the force the 0 tzk s(i:ueyjqmn )px5; k(5ofirst 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 of

  If you exert a force (on:fw czpt ed+b 8*m7F on an object, the force which the object exerts on you wil7*bemf8odz cn+ tpw:(l

  Action-reaction forcev.ksnd(2y,f :p y-cdi s

  Action-reaction forces ; xvmph5-iu)whvj)ptgc* x). are

  A 20-ton truck collides with a 1500-lb car and causes a 0 *ehgy wes:5bymlb.+lot of damage to the car. Since a lot of damah5mgy.wey +e s:0 lbb*ge is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object wijiq m2 fpy8x0 h-u t0j*qs9h7wew++ -hpzn l(bth force mg, which we will call the action force. What is th 0 02wjw puq hm*snzy9fqx8-lh+e -i(7jhb p+te reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth p05 spt+) ai fg kggw(dbh0l+a4ulls downward on the toy with its weight force of 8.0 N. If this is the "action fog(tp+g) fd0 ah iag+0l54 bkwsrce," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantwlw q2sc .,k7paneous force. The ball hits the bat with an instantaneous force, whosewpwq lk,c.72 s magnitude is

State Newton's three lae4 yeou, nhd8 azzm.4/ws.

  Mass and weight

  The acceleration due to gravity is lowert,el*0vi2ad cprbpnii ) (d85 (wn v+y on the Moon than on Earth. Which of the following is true about the mass and weight of,2i dpiled5( ba) + vc *0nyrw8p(invt an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts z3+fkmbk-ys3-b 7b ixat a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N6e ibuh,m:4 nr or a person weighi :,en4iur6bmh ng 600 N?

  A stone is thrown straight up. Ati3/7 p4ldp +yh-ssnm )ou3nvz the top of its path, the net force acting on itnpz/y i-vdsnl7 ums3o p 4+h)3 is

  A 20-N weight and a 5ki .g a5lk2(mi gt/w3l.0-N weight are dropped simultaneously from the same height. Ignore air resistance. Compare their accei3a k.w5ggmk 2i/l t(llerations.

  A brick and a feather fall to the earth at their respective terminal velocities. ;m6vw07nz snn Which object experiences th sv;n6nnzm w70e greater force of air friction?

  An object of mass m is hanging by a string from t+ueb f7(oo)j1duo ux1he ceiling of an elevator. The elevator is moving up at cons u o)(b+jdx oof71e1uutant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. wju4wgtjepwn9h;s:1(/ i: r w The elevator is moving upward, but slowing down. What is the tension in thw w:/ wu1; j nj(9rg:wthsep4ie string?

  The force that keeps you frpab+ljmosy6i q 3jt zz5k6 *(5om sliding on an icy sidewalk is

  It's more difficult to start moving a heavycj)*vk vnm,wr0ebie ;9x77qii3g) pw carton from rest than it is to keep pushing i)i9p7jiv eq*g3c)wnbrk w; xe,i vm70t with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface (fr2*muapg2,d ms p,mno /iction is present) a *gmmoppms /2,d,u2nat 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 acceleration?

  A packing crate slides down an inclined l;i ,71rohzmi; o; 8xct6,6ci h*jlritsp fc)ramp at constant velocity. Thus we can dedu,z1; ;x h6 mtihl8ti;* c,jo6rccrploi)fi s 7ce that

  A block of mass M slides downyh.0nh*9md479+/rj*xyaq pv tqv ui h4 ftf6h a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by thq/+h.qh 4v pvi 4f drmt9thy 69xj*0 fa*nh7yue plane on the block is

  A block of mass M slides down a frictionless pl z)1pu:ydg5 rfane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the blg: )f1yzp5ur dock is directed

  A block of mass M slides down l.z /ahl6)xeefg+627aqshnf a frictionless plane inclined at an angle q with the horizontal. The gle7/g xnf2ah6)ls e.f6qa+z h ravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined vsegut478 9zq5g*cblplane that makes an angle of 3cqv 8ugt*gze l9sb7 450e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N forcj5- yck. :hf+2xsk qvbe is applied to the object, aj. fxk kv:5-cbhsq2+y nd it accelerates at $2.0m/s^2$. What is the mass of the object?

  A sports car of mass 10/qnb:b r)eie)uh58 jh00 kg can accelerate from rest to 27 m/s in 7.0 s. What isb8u:b5 ie )hnqe/) jrh the 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. W 5qje**hfet0jhat is the net force acting 0 et*hf5jj*qe on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a);4 hdoasmah90nm c e,4e r9kk speed of 50.0 m/s after md )4c9esak9k0o nm4 ahh ,re;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 sam;pkk0l s4d h62uurilyu92 uj) e force that you push a 10-kg mass from re 20uj;p6ur)i ks9yd2ku4ulh lst,

  What is the mass of a person who weighs 110(anx/7rokmu :g5( tpg lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth wb sts 6l41lu3uhere the acceleration due to gravity il u4lbsut3 61ss $9.80m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object on tcljga7 :zq+7 jhe surface of the Moon where the acceleration due to gravig77:l+qazc j jty is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B wegg5y(ju/vv knf+ bn13ighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the v bnk5 (v1yf/+3ggjun masses of the objects.

  Sue and Sean are having a tug-of-wak86b-gog (v uyr by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force u-b( vggk 8oy6if the rope accelerates toward Sue at $2.0m/s^2$?

  A stack of books rests omdj( o:u0w*j1 baui 4wn a level frictionless surface. A force F acts on the stack, and it ac*o(u jdmw1awi 0ub :4jcelerates at $3.0m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0m/s^2$. What was the mass of the original stack?

  A person of weight 480 N stands on a scale in an elevator sft:38ny9gng. What will the scale be reading when the elevator is accelerating downward gg38stf y9 n:nat $4.00m/s^2$?

  A person on a scale rides 7 k9lo+b5a 8a2fjomoi in an elevator. If the mass of the person is 60.0 kg and the elevator aco9+78imbj ooal 5kaf2 celerates downward with an acceleration of $4.90m/s^2$, what is the reading on the scale?

  A person on a scale rides if (r(a/+hb 8u r8-m blgi)ehccn an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward f 8he/ib+c-gubr( mlh a8 ()rcwith an acceleration of $4.90m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. Oasrf( lp)/ k-7,ops:m w3mh9qy6uwpq ne force has a magnitude of 8.0 N and is directed due north.ul-mw3ppqkf) a9 psrq/s:yo76m,h w( 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 on the flatbed of a truck. It is held cmjdu /r8;i4kin place by metal brackets that c/iur4 ; jmdk8can 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 of a truck. ip44c *fqvjtc :qikn8p3c, r*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 time if the load is not to slide forward it3c ij*8,k4 q*vfq rppc:4nicnto the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m gqgzn nu to)d *2/)1lk= 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulle*1g ouznk2) q)/ gtldny.)

  In the Atwood machine shown in 4fihl v-3vfwxy6:rks; jxm8 3Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the striri ;yh8v6lj-4vmkf x:3xw f3s ng? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on 0*,- uyaplat3- x:jlt9exu,-ivtf,u v c t bk,a smooth horizontal floor with a force of 100 N in y ,ai , x*tux09ua,-t t:lk vfl-v,ptcbue-j3a 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 of books on a smooth horizontal floor with a foerua 3m;jx0.x-fugak b uw 32:rce of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and thej33w:.uu gaumbrfe2 -0xkx; a 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. 4-2. g:no :qb xrw//hif)u2 What arebui2wr h:x)gn/q/ o f: the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass l zzpsq+5.c,jb0b8f wof the traffic lightp bz8z w.j5fl,bqcs+0?

  Two boxes of masses m and 2m are i 10q9a/z c6r:.np c b-dclihc3wcs+pz n contact with each other on a frictionless surface. (See Fig. 4-3.) What is th3adqwc1np0+9/.bz ip src- l :cchcz 6e acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each o(:fuqg*t v+kmther on a frictionless surface. (See Fig. 4-3.) What is the net fof:+ (ukqgt mv*rce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig.2)bg38) z3 olqid /isvem/ b2,azhohi 4-4.) If the forward force on the more massive box is F, what is the tension in the connectg)3i doab/vmibo qezhz/22 h3,8l) siing rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the 7szuccb 2k+ 8-wfob6qqx)w a1 forfuq +8a26 c7bqowkbx-w s)z1c ward force on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley zeho 8y6kl 1g4.augi) as shown in Fig. 4-5. Box I of l egog.)861yui4 zahk 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 g5thhcl6 .rh7 1y bt,zbetween a 3.0-kg box and a desk are 0.40 and 0.30, respectively. Whabr,t h5g6 ych.lzh 17tt is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of staz) elb hf25kb+*/hn qstic and kinetic frictions for plastic on wood are 0.50 anfqse n5*+bl2/hkbzh ) d 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 the ,7eg:i;jyqz81;b fw xmqfp5 o+x direction. It slows and comes to a stop withxm j5 ,8z fg1pqfyew;ioqb;:7 a constant acceleration of -$2.45m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pulled by a 5.0-N force. A 3.0-h/4a v*p8uu jm-bnk (rut* sx)b*.usoN friction forcmn(svuupx)/u*s* 8k4bot-u *jbr ah.e retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N -hu0sb k* 1.rvgclfo3accelerates a 4.0-kg mass, from rest, at a rate of $0.50m/s^2$ 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 slides5 (s/,gehmv6ug)b dgzk.z kd ( 50 m on the ice before it stopumd/g).s 6 (kdkzgv,ghzbe 5(s. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accidtg+mh7wf yq e )3is8i5ent, police find skid marks 90.0 m long. es5h+)fw im7q3 ig t8y 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 applied.

  Two boxes of masses m and 3m are(d+mh: a ,s3nc i*sxsf 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 static fric nsfsc(h+ x,da 3*:ismtion force on the less massive box?

  Two boxes of masses m and 3m are sly-d lgw c:l(.tacked. (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 coefficiwd.l-:y g(lclent of static friction between the boxes?

  An object is on a frictionless inclined plane. The plank6aq2 t lbc47mff7o:he is inclined at an angle of f l k7b74hqc: 62toamf${30}^{\circ }$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle9n)vvaa -b kt9rkr3biq) s nd0 w(t/9g 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 zsqsd k fyqn(uo10l/* ok*6( kplane 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 smooth6 yv/ jef4at6h 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 slides dlc) wpnt.tqu.gm;9)k 88xwr oirectly down an inclined plane, at a constant velocity of 6.08 p;xntwmo 8)lg )k.9r.ct wuq 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 slidmgl7r( c s 6zcpoaxv4 x x18y8b:g;bf(es 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 dow.3sm(b*2/wez y v1mw1,fr z ac8wq 3wjeob2lsn 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 wpwvm ay08s+n:pvr , /500 N along a rough surface. The cable attached to the log makes w+, /rv yp:msvapnw 08an 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 anglef7c:n ye1n.sz7 i75z0 nrcjo(i, ti0vq;bfnb ofsn7c0f7nn 0bie,ity nvoj1b (q7z 5:rf zci .; ${33.5}^{\circ }$ 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 pnu :6w hlmv f21y2cei7 r(adz;lane. The angle of incline is gradually incic(1u 6y7hwa2nv z2;df:lm rereased 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 the plane?