Which of Newton's laws best explains why motorists should buckle-u.lt4sg 015z m;xeyswqp?

  When you sit on a chair, the ch m yif,bifn-(a;- b-y ,bwr5resultant force on you is

  In the absence of an external force, a moving object wilhkpmwrb87 z8,vc b;6 gnjn -5nl

  When the rocket engines on the starship NO-PAIN-m0dvp, u+gat (- rqh)mNO-GAIN are suddenly turned off, while d( pqrg m-t)0mhvu,+a traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with cox(v+qb eu 2y/tnstant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force thvu+tq/(xye b2at must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, an tcq0ipvtt(p/j7i7b.p e8 3:9 rdwry rd you suddenly fall forward. You .p7b9w :r rpci0e v/ yptj(78tdq3rti can imply from this that the bus's

  You are standing in a moving bus, i f -0d-kwbof ql96 k0t4dx(wbfacing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forwaftfobl-kd0xw(wi 4d0b9q- 6krd?

  A constant net force acts on zp3i( ar,.ufpn:t k:y an object. Describe the motion of the object.

  The acceleration of an objecfx 2ej+ l;v1e,xajnh0t is inversely proportional to

  A net force F accelerates a mass m with an acceleration a.9 kre3t - jvx)8fttj,m If the same net force is applied to mass 2m, thxm,9-)8jtrjt vk fe3t en the acceleration will be

  A net force F acts on a mass m ,.dlrpwq7-s,wv1 k iov7s n:tand produces an acceleration a. What acceleration reslon71v,-vsspdwrk t w7: q.,iults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then x5j0+ss qdoyymozp3/6 wg7 k2release it, the balloon will fly away. This is anz0 +p5 dm2qos xyo6w3jk s7gy/ illustration of

  Two cars collide head-on. At every mom y,rtbcl9tcc8x0+ w,d ent during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of th,+c0 b wl8dtxr9y ,ctce 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 object exe*: j pjhfxm55 / whrw)s+:yuxrrts on you wihr:fh *ywr5 x/j):jmp+ suw5 xll

  Action-reaction forcrrr44hgv: ) y e1a0hcues

  Action-reaction forces atav /t k;mur6lid8;k5re

  A 20-ton truck collides with a 1500yczrp* (gxl9 2-lb car and causes a lot of damage to the car. Since a lot of damage is xg(zrply9* 2cdone on the car

  An object of mass m sits on a flat table. The Earth pulls on this object wit*xv/zmh5 9 gzyh force mg, which we will calzg vx5 /y*m9hzl the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means ofh:np8zbu n g+9 a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "actio+:nzgunb 8h 9pn force," what is the "reaction force"?

  Your bat hits the ball pitched to yo/wm:)id2jzt 10 oljxi5 dcgv9u with a 1500-N instantaneous force. The ba29d1l idm/0o czjiv)t5gxj w :ll hits the bat with an instantaneous force, whose magnitude is

State Newton's threeuaq u,mhgt1g0i tes 352z h5p2 laws.

  Mass and weight

  The acceleration due to gravity is lower on ts72uv -t8wx4nv esb8 qhe Moon than on Earth. Which of the following is true about the mass andxv2w8sve-u 7n qb8t4s weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which jt/b *gixi,5oacts at a distance is

  Who has a greater weight to mass ra.c+g, f-4owax:f ;prgh3 o poqtio, a person weighing 400 N or a person weighing 600 N3-oahf roqp, x;gfwg p:.+4oc ?

  A stone is thrown straight up. At the top of its path, 4co(lb6djog) the net force acting on it 4cbl(o o)j g6dis

  A 20-N weight and a 5.0-N weight are dropped simultaneouslytt*026hqbsjsbj1wqc9i. , b6t sez-n from the same height. Ignore air resistance. Cth0s etbi-qns2b ,c6*js9b61 tqw . jzompare their accelerations.

  A brick and a feather fall to the earth at their respective terminal vel1l:k7cm x.jb mocities. Which object experiences the greater force ox .cj1 7kmmb:lf air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator.efpavg a0al z* 5p3y-f d)t /rs5nzs2; The elevator is moving up at constant speed. r/f ss5 ap0dy*t pzlvaa2g);n-53zef What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of a n2ac7q)y4 npdn elevator. The elevy an4ncp )7dq2ator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewtsynx(zes q4( tnk0 vq7. y*8lk9gx+ walk is

  It's more difficult to start moving a heavy carton fr0v wjbt:bi-m9 om rest than it is to keep pushing it with constant velo-jt 9vib w0:mbcity, because

  A horizontal force accelerates 1x qzv6 n4v,)zo50g3f qt 63rucyzxf4*ln lbq a box from rest across a horizontal surface (friction is present) at a constant rate. 4 *xv l606zqybf13frocgqv54z) zu3tx,l qnnThe 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 ramp at constant velo ogp(c ciy4vy7x0en qmt.5 1y8city. Thus we can dedunq7ye c(1tp45yvcogy m 0i x.8ce that

  A block of mass M slides down a frictionless plane inclined at an angle q wnl2/n f62nj cm1cx i)vith the horizontal. The normal reaction force exerted by the mvnxnc l)ic12j 6fn/2 plane on the block is

  A block of mass M sli7teh*r3: / 8x3 zlyoqvid +syjdes down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on3qzehl *yxisdo:83r7 +j vy/t the block is directed

  A block of mass M slidesk n6nex85 tm7m down a frictionless plane inclined at an angle q with the horizontal. The gravitational force is 6kntx7 mnm5e 8directed

  Two toy cars (16 kg and 2.0 kg) are releaseb t xzo)2d5s/yw)7 rqgd simultaneously on an inclined plane that makes an angle of 30e with theb)x)w/2qg5y z ortd7s horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appli7. r3qrcvu-qcx64xn v: 9dyfkz 1un+wed to the object, and it accelerat x1 :q uvc7rvz6nr qc+w .4-kudxf3yn9es at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 100m r i;/egatnja; )5s2 c5-wrdb*-pk ug0 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward rind/rw*5abu tc;g)e2gm;5j --a kps force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s ine0kn i6 jc7m o0+0hscm 2.0 s. What is the net force acting hc e+m i os006mk0jn7con the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 mo3jb0 0dzjc)s, a: f5rrjdzr0/s after travebrfdz5, roc:3 j)0jdrjs0 z 0aling
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 10-kg masssa do .093 bxu)gdca1x4jm cvlu g.-6u from rest)l 6-uvuj9 dma.b .sxuc1dg 4oac30xg ,

  What is the mass of a y ;1gw2elossj2 fwj,+person who weighs 110 lb?

  What is the mass of an object that weighs 250 N.fkze5ay bmy1e me. 9* on the surface of the Earth where the accelera*y.m9.me ae1ebyzk5ftion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the a+2jagkmtw de-su16 3 object on the surm6tek+ 1w 3-a2uds gajface 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 weighs 40 N g4z4c)c q9d*5y:kr:vh krk mo on the Moon. The Moon's kck h9:g:z)y4 4*m cvrodqkr5gravity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.06i)hl;q2p1ms, wu z -f,md 6ybxk0 wfvydz 4a+-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward ,m-)uxw 01fq4k2 wyzisybh,; a d66 dzlmf+pvSue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A fr2ml;y 9hb6 ) :9n8twdhh;qexn9 axn zorce F acts on the stack, and it accel9m69;:qnxl)t dn ry9;we 8b a xhhznh2erates 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 eloyswl n3a -5b,evator. What will the scale be reading when5byal s,3on-w 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 per pb+v* 7e* hi loghlfra3(+x(eson is 60.0 kg and the elevator accelerates downward wil(f+*oix(lr* eheh37 +vgp ba th an acceleration 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 person is 60.4dsio)0np n4t n qs,:g0 kg anopn 0tq)4sd4 snn,ig :d the elevator accelerates 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 a magnitude of 8+21fy:qs8miz l 8lx dw2 zt) 35fndtjt.0 N and is directed due north. The second force toward the east has a magtz)qwfs58yjtti28 3: n l12 d l+dxfmznitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a h. m;*jt e06xjura/. gaekh-mtruck. 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 /- a.ke hx*m0m6uaejtjr;.gh is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a tvj/y/:(d/tu(qq3ajf;h fqz yp*4 u p iruck. It is held in place by metal brackets that can exert y ( v;4piyf dauj/pqufhq(z/t*3 q:/j 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 sl+h-t6*g7qip jl,2xhp y ) pjvhown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the maspvp g2it- hl)7h,*xlpjq6+ yjs of the pulley.)

  In the Atwood machine shown in Fig. buvmnap )2 :3ao4n/aj4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in th/auanjbv m 3:nap )42oe string? (Ignore friction and the mass of the pulley.)

  A student pulls a bot7fidp4-jtr6 y g (b4i0d)nvy2 s bk2vx of books on a smooth horizontal floor with a force of 100 N in a direction -y7j6v)f 04idin4kbbtyt dp2 g v(sr2of $37^{\circ}$ 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 ho5n 7bna4 ,7eocawnvi1rizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, what is th77 nnni45a,ov1 cbe awe normal force on the box?

  A traffic light of weig )t2r5zmir:sd lj;x;e9e4yzxht 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in tx)tjsi;dz :2r9 exm;45zyr elhe ropes?

  In Fig. 4-2, if the tensions in the ropes are 5kdogdz; u,/ sm+()8ad(x ad uj0 N, what is the mass of the traffic lighz)jx m( ;o ddg8/sa(udka+,udt?

  Two boxes of masses mr60*jcrg th0wm5se 8eoc/gb ;rj ;c g/ and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the accelshcj*85/ rm0 j orc6tr;gw c0be/ gg;eeration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionlesg:dc eiwb o ,2+me01ngs surface. (See Fig. 4-3.) What is the net forcee1in bo0d eg+c,wmg:2 on the more massive box?

  Two boxes of masses m and 2m are connpmzx+b8r7x,u ected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the conne7,mbz+x rx pu8cting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the cc )y4 )bkzt4x3seh6c7y10yc mmgf; a forward force on the mor m)cm;7a3e c) sh0yt1bk4yccf 64 yzgxe massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as showgr;dbry.- x2yq p3t9t e.cbh5n in Fig. 4-5. Box gd.9yh2t-rcb5t rqb. 3x;e ypI 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 static and kinetic frictions between0qih2 bc qnxocwclk9245i6w / a 3.0-kg box and a desk are 0.40 and 0.30, respw40 b inw2cl9k2/h5 oq6cq icxectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of u to2tq i+w0kc *9f;mhstatic and kinetic frictions for plastic on wood are 0.50 and 0.q0fm9 t;wto k2c* hui+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 +x direction. It slows and comes td*x.sjaaz g+*c )7hu qyjv;j,o a stop with a constant accelera ;hjj .g 7vdj,q*z sua*)axyc+tion 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 horizit-4p/cz2 zuta;puz / ontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the objecztu2ci a/ /4pp-t z;uzt?

  A horizontal force of 5.0 N accelerates a 4.0-kg mas kj)6coj) 4p:vqojh2 va;(a lgs, 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 givenon q,5bzepkg; +g+ oeged( /+s an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction be(ondog5+ qg,b k ;s/ ep+ez+getween the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 9ui/c.j5-1 h tho(s naji.;pro0.0 m long. They determine the coefficient of friji a1(iu.nrpjs;ch.- /oot 5hction 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 stack5yfbr6 nz4w ,ied. (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 slide4 r5wfz yi6bn, 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. (Seez;re59wgc4q v Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the95; 4c qrwzveg 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.zpzk ,1xcws;pa p8 :y; The plane is inclined at an angle z8, ; wp1a;y:zk pcpxsof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that make9i5awbz,(w lh v86zj3g zfy 8as 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*4r91o2k2dt xks 81jzn; m 9cglkz pln 9z(nkg inclined 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 inc)mcd3 m( ldfr0lined 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 directly down an inclined pla0o (hcb1 4pkc3t7xefane, at a constant velocity of c kfph73ebtco x(a1046.0 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 slidm 1s.mi ) )d; fgedbf,t+hw)ohes 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 rougn)ebiymfs,v ga*m ug: :4o/1 lh $37^{\circ}$ 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 surfac p1bls(nkrz d88khm6 ,e. The cable attached to the log makes(d8r1pnl k hbm8z6,k s 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 mgve2hj)1y6;+egn 0dv *clt m an angle of 1jvvt0e+gn;hm)2lcg edym 6* $33.5^{\circ}$ 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 of incli+z ;dy;dyu;3.bdh 2qafug tv +ne is gradually increased until f2u za; t+ h; qdugbvy3;yd+d.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?