Which of Newton's laws best explains why motorists should 3dgzpx r*5/(+d daeyh buckle-up?

  When you sit on a chair, th 7hg0kl5wlwj:e resultant force on you is

  In the absence of an 0v1acqoue uyol,fb0)r9m40u external force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tv.btj 2 xfuo2x3 sk3nqwz d8yskqqw)o7.8v:)urned off, while traveling in empty space, th3zso )j f.x.q w vnq:so3 d72k kwu)t2vy8q8bxe starship will

  A rocket moves through empty space injst3dhw a 9/g: a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, ws3/dtja g:h 9the 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 z:x4)d c+ixvfb34vfr you suddenly fall forward. You can imply fro: xfcdz4iv)3rfbv4+ xm this that the bus's

  You are standing in a 6vcp. nhbm) ata-30evmoving bus, facing forward, and you suddenly fall forward as the bu)het3-6canv p0m bav .s comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion 3 3nojn;vqr0vof the object.

  The acceleration of an object is inversely pr1y y85si2 )diqs6uepo oportional to

  A net force F accelerates a mass m with an acceleration a. If the same net dtramr6(y up(w6z7: w 0zz2py force is applied to mass 2m, then the acceley 7r20m:a6wz(zywt p d(zr p6uration will be

  A net force F acts on a mass m and produces an acceleration)i4rz1 y6evcyy baoe8q.,b o/ a. What acceleration results if a net force 2F acts on mass 4m? .becbe 8iyzaqov,)/r1 4oyy6

  If you blow up a balloon, and then release it, theeg- d7(ule(*ika o)ee balloon will fly away. This is an illustration o(e( e*ai7l u)dek go-ef

  Two cars collide head-on. At every moment during the collision, the magni/,+tymv zitbjez +* 4;o y+oeytude 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 foy t/ie*+zmt+oj+ ybz ;4ey,v irst. This is an example of

  If you exert a force F on d2mx97qgia 5oan object, the force which the object exerts on you wild i5g 7xq2oa9ml

  Action-reaction forc1a-d ip5 hrtfp;2(phm es

  Action-reaction force b(coxt h7ap-d4q /a2ss are

  A 20-ton truck collides with a 1500-l f,t iur*6:zv1pom 9;ylyhdq5 b car and causes a lot of damage to the car. Since a qzf 5m h,9yyl;potdr61*i :uvlot of damage is done on the car

  An object of mass m sits on a flat tabl15ov9 hb:7 bkuj ch)ife. The Earth pulls on this object with force mg, which we will ca bv i7ku:o9hf1)h5jbcll the action force. What is the reaction force?

  A child's toy is suspended fvj s 1p17evetv23 gxh7rom 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," what x73h71 2g pevsvj1e vtis the "reaction force"?

  Your bat hits the ball pi) fb xv9m (uez 2c2m71u9 zwho*do(yrrtched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose mmwrv)*e9dry 2uz9xo7c1(oh b(u 2mfzagnitude is

State Newton's three laws.: rr,:sth yllo7l )f.l

  Mass and weight

  The acceleration due to gravity is lower on thdx 2 +g8xhx(iylzvlo;d8n 21 ae Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the ;hxd (8n2+gxlz xda 1oiy l82vMoon's surface, compared to Earth?

  An example of a force which h +z i;u*u b6p)d2zdl.j tvqo2acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 40 8g,,su ldmhr8,0a6hg gv o 9;uqdgj:m0 N or a person weighj ,d,;9 0rgudohgmg, l 88u6qsvhg:maing 600 N?

  A stone is thrown straight up. At 1rj)m/r i6iyzmah37l 9 ppbey2t:5 e pthe top of its path, the net force acting on itt: lpr)m zp/beh7ir yiy5aej6291 m3p is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from th gin; l2jg 6u.ipeh/(r re1)i6kp lhj7e same height. Ignore air resiuiel)ihj 6hp7r6 g( rjg1;/ i pn.2eklstance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal vl9k7ik6bhey / elocities. Which object experiences the greater force of air frict7ke9yh/bk6 i lion?

  An object of mass m is hanging by a string from the ceiling of an elevator.wd.( dz8 a2q akk*(uie The elevator is moving up at constant speed. Whz2ediau*q( kkaw (8d.at is the tension in the string?

  An object of mass m is hanging by a string from the ceiling xqtbg k.q vhvcn0++1 g5w2m*fof an elevator. The elevator is moving upward, but slowing down. What is the tensig 2gk0vfmxcn .q5t 1w b++vh*qon in the string?

  The force that keeps you from slidineh oh-n:5tzk. g on an icy sidewalk is

  It's more difficult to start moving a heavy carton from restiz(i fm0 r.;w*7aei s,y1cfs3e.u lch than it is to keep pushing it with constant velocity, be; fm1s u 7cl3f(sewii r0z c.ey,*i.hacause

  A horizontal force accelerates a box from rest acr9s xy6r: ,lzvlel x puj:uc 4:l3/;scsoss a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditv ll946:e /3jclx ssu,l szx:y;ur: pcions 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 can8 gp qvs--vlvwf5bb 3rr(ht26 de2(lptg -bvsbvv8 rqr5whf63-duce that

  A block of mass M slides down a frictionl ihu8:cuuu 06jx1fu5 vess plane inclined at an angle q with the horizontal. The normal reaction force exerted u:1f0j56i uuh8vu c uxby the plane on the block is

  A block of mass M slides down a frictionless plane inclin a,hlq/1v9kx sed at an angle q with the horizontal. The normal reaction force exerted by thh1 ax qskl,9v/e plane on the block is directed

  A block of mass M slides down a friuia s y.7l5eno: 31ncxctionless plane inclined at an angle q with the horizontal. The gravitn s:i3cxoy 5eanu.7l 1ational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneouslyhegiqjlp-o v nn9*+ 8z:.gg+cu / jg2v on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their accelerationv9 u/.n*oen8gq+zgph-jgvj c +2:i gl after being released.

  An object sits on a fri0k ahx6kko,skl;3.oj ctionless surface. A 16-N force is applied to the object,k j k.6a0,lxoho;k3k s and it 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-vm qh8.qec1 qazsj43be2 9i m. What is the average forward forca 1hb9q3 vqiqezc8s -em 4.j2me on the car?

  Starting from rest, a 4 jn- usaf0. bu*6jes9b.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is t.0uf6nsus *b jja-9behe net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquireg1dk rd wpxb70k2z9e4 s a speed of 50.0 m/s after trav40ze1d9p dg7bkw 2r kxeling
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 you push a 1jwc+qk*yjo naqs/s7jw 8z,7 .0-kg mass from re zaj*7+oks w/s,7qc. yj8n qwjst,

  What is the mass of a person who wxpn d-7-qsw( teighs 110 lb?

  What is the mass of an object that weighs 250 N on the:n.1 sl4kw j:or 3rfhq surface of the Earth where the acceleration duo:1rn3h lfsj. wk4rq:e to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is ob b:xa;t*ptn.g v- )rthe mass of the object on the surface of the Moon where tg*tb -r)pva;xno.b :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 on thyn 1 cfm2 q7,kgy ov4j9ddh2f9e Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of t ,nymk2cv9 do d4qjg92 1yh7ffhe objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of tvt*il ka :vn nq6147qa 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates towaav*i :vq741 tql tk6nnrd Sue at $2.0 \; m/s^2$?

  A stack of books restscy* 9nd3mllc0 on a level frictionless surface. A force F acts on the stack, and it 3l 0*yncc9mldaccelerates 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 1.-y :yi(fpofs nhk8 rwill the scale (s iyy:f-ok 81n.h rfpbe reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the personl /qq -fh(ux6py )0nkm is 60.0 kg and the elevator accelerates downward with hmuylfn qx(/p- q )06kan acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ab:7 yt0vpp ,trides in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward yv bpt tp0a,:7with 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 ha8 lxp cs0j x8r2r.bi-vs a magnitude of 8.0 N and is di 8ljx2c80- vpi xsbr.rrected due north. 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- nd/7;paits,xn,j jrelz9)3u wt6x o truck. It is held in place by metal brackets that can exert a maximum horizontal force o z-wjun;)7/s 9x6lx,t irpdjoante3 ,f 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 2f2l jbxa)l-3ztt v4p the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of)4zlplb2tv- a3jt 2 xf 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, ihoqlfl9 am8j b7mw; (*f M = 0.60 kg and m = 0.40 kg, what is the magnitu(fw b9a87lo l mhjm;*qde of the acceleration of the system? (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 kg, what iscvmnhy2o. , lnh-t2z- the tension 2,nhhtl.v nmy-- c2zoin the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a/bb*fw6)46gtgx ofly force of 100 o xlbtyf4 wb66*)gg/fN 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 of books on a smooth horizontal floor with3pi k-il ww6 nm82f 39viuilh5 a force of 100 N in a direction o8l3 3 lhi ui9p56viimwnwf-2kf 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 .ngbr nju m3qe* 39*fnis supported by two ropes as shown in Fig. 4-2. What fn9rqn*b.e j3g 3n*muare the tensions in the ropes?

  In Fig. 4-2, if the tensions in the r5(iy ni :0yyayopes are 50 N, what is the mass of the traffic lig yyiy:0 (5anyiht?

  Two boxes of masses m and 2m are in contact with each other on a fricti/bap((v: nz bwptx/*tonless surface. (See Fig. 4-3.) Wha(bbz p / /axvt(pt:*wnt is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionlesoc9ahdbn* ; we c4*3qy4nv 3pcs surface. (See Fig. 4-3.) What is the net force on na3449ce3 ydhqpc;w*v* cobnthe more massive box?

  Two boxes of masses m and 2m are co(cg:odole 6 3ennected by a rope. (See Fig. 4-4.) If the forward force on:6gloe ce3( od the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m an)4 u;b,km whuad 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more mas;4 bkuaw ,h)umsive box is F, what is the acceleration of the less massive box?

Two boxes are connected btmgkfe/d uvq;2t)*enu 4 6ki 3y a cord running over a pulley as shown in Fig. 4-5. Boxk f )kd e6*2;u4 /tmnitqgev3u 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 sta 2og9qa8bp ma6 8j4kgytic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 1aj8b4mp2gqo8ka 96gy5 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on woow-(f q*il yvjal( n2d;d are 0.50 and 0. iq(wna(d-;v 2f*ly lj40,
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 dirs84)o282m4gmcc3p jwrvg8yt 3a h/ rj(qk e tzection. It slows and comes to a stop with a constant accelek2sm 8wr8pqr3h/e)ogmva g4tzcj 2 j3t84y(cration 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 horizontal surface is pulled by a 5.0-N force. A 3.0-*zb0tn9tjf 0nk*/zdi N friction force retards the z*b00 /zf n9ntdjkt*imotion. What is the acceleration of the object?

  A horizontal force of 5.0 N acceleras:q4* t c 096n izd (/wwg3tsekdells0tes 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. Itxoso*jh2(nf.m/,u fh 8r hg3h slides 50 m on t,( ohn/8fj.s uxh2r*of hmg3h he ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a4fxd(q pk2 + md6zx5mra5j0ew traffic accident, police find skid marks 90.0 m long. They determine the coeffi xqpr54k2edz j mfx0dmw6(5+a cient 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 ,mlvnz 8ew4nc* j0drqb i( p/(and 3m are 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 rour048m(vd (nzj nbl,wc/ eiqp* gh. 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. (See Figkyj8 g)4w h)x8u+ kglo. 4-6.) The surface between the more massive box and the horizontal surface is smoxy)w)8g48k lo ug+jhkoth 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 frictih+-4 en/rw.8hql lous onless inclined plane. The plane is inclined at an angle of eohqr.hlnu 84s-/wl +$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dowam lr)pq jn1r8k9- uk0n a flat 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 inclined plane uomk13)e-ck j;- sn xnwith 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 plane tiltk2q / emu inzx,v*.cn.x6 vk/wed 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 hft1lhgty:ie2;uj scp( 218 ea constant velocity of 6.0 m/hph ife;28c1el2u1 jt:y(tg s 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 down ;p)vd 9y1)mufdm q9 dwa 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 s7w wpo ,ztyn)ia02f4t lides 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 N along a rouhi+ wf 9j.f:tcgh surface. The cable attached to t fjwc:9t+.ihf he 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 tiltedq7 xpfhc8v8 a) w;(tse at an angle of (v xpeqf 7)s a8t8wch;$33.5^{\circ}$ 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 oz gvp2;z yn.)8 avf2dbf incline is gradually increased until the object begins to slide. The angle at which this occurs is vbv y; a2 zg8)nzp.f2dq. What is the coefficient of static friction between the object and the plane?