Which of Newton's laws best explainsnwvzw/gkk 82+n.pl f 5 why motorists should buckle-up?

  When you sit on a chair, the resultant force on youog5hpw* w* kxb4m 0k(v is

  In the absence of an 6+tt/ ggzw(j:u lv( emm j1id8external force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tu 1mv8dfpkdyp(03pt r0rned off, whi1dp k0p(8mtd 0y3rfpvle traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constanth,r5rue9ic+o0 e jwp3 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 sustoh9rcrpj,iu0+ ee53wain its motion is

  You are standing in a moving bus, facing forward, and you sudd+lv *k3k4c 6sbhs;gdpy e d3 +lco1+fjenly fall forward. You can imply from this that t 34kd+1so3hgel;csf*j+ lc6bp + kydvhe bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forh2qd;xs o 6i)(ynh.zqward as the bus comes to an imyosxqhni6) ;dhqz (2.mediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the moxwap3z6i0m 7xaudj,5tion of the object.

  The acceleration of an object .12aezjs /xch is inversely proportional to

  A net force F accelerates a mass m with an accaipq m 277,ryjeleration a. If the same net forciq ry m727ap,je is applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produc 720-6g(okokvy gi 0p kgj.f8ttkha:ses an acceleration a. What acceleration r8pjy6g- o :ga.2 k0ikk7gho(k0v tfst esults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, thm. gaoz6. g60lqy tpo*e balloon will fly away. This is any pgqgtm*zol0 .a o.66 illustration of

  Two cars collide head-on. At every moment during the collision, the m-i5 094vr h5fhdfzpd yagnitude of the force the first car exerts on the hv5-y0f rhdpd i5z49fsecond 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 F on an object, the force which the object exerts on you ) spdx txkp3:my78c2swillpk37s 8)m2:xyt dxcsp

  Action-reaction forcesxbq7+swr1(:uwo9w8x av9 s3dju7g hc

  Action-reaction forceid d*ani:x f1s-ub40rs are

  A 20-ton truck collides with a 1500-lb car and causes jc:x )k f6*dt7dyi97wfem q,ca lot of damage to the car. Since a lot of damage is :,wtff7c9k )ey 6q id*mx7cdjdone on the car

  An object of mass m sits on a flat table. The Earth pulls on this o as* vpcyaon.w:2ma27bject with force mg, which we will call the action force. What is the reaction fo:vpa cons.w7a2yam 2*rce?

  A child's toy is suspended from the ceiling by means of a string. The tmo- fxc2;3pv Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what i2; ovxtf3- cmps the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantan;aps 8fl0m1 kleous force. The ball hits the bat with masf pk;08l l1an instantaneous force, whose magnitude is

State Newton's three l.vppav6cxh-,3 ep w71+ (nsoc0i qfda aws.

  Mass and weight

  The acceleration due to gravityh0e au3 4i9cyk is lower on the Moon than on Earth. Which of the following is trkue3i 9ya04 chue about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance 43/mccvx;e vg*vk:f zis

  Who has a greater weight to mass ratio, a person weighing vcpr g so53)9im9f; lg400 N or a person weighing 600 ); 35 mvsgrc99o fipglN?

  A stone is thrown straight up. At the top of its path, the net forck:bvraf a (/lby:;q)ae acting on it l )qa/af;:braby:vk (is

  A 20-N weight and a 5.0-N weight are dropped simultaneou, 4oi( fsvl w06i)vvxcsly from the same height. Ignore air resistance. Compare their accel(x) vos6,cf40il vwiverations.

  A brick and a feather fall to the earth at their respective ter ct+le ftf /n3 dyj-ydxe*( +u)fg74kwminal velocities. Which object experiences the greater force of air friction? wx/y4e)etn++fftdu(ck3 dlf y-j 7*g

  An object of mass m is hanging by trnb8uw3h*kn 9exe 1 +a string from the ceiling of an elevator. The elevator is moving up at constant speed. W3e u+kh8ntr xebn*w19hat is the tension in the string?

  An object of mass m is hanging by a stringsu vozo:3 lu5x9xafmpc- up f:k 2b4*/ from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the stringvpxf 3 ac*f5 :o uu:p42 zxluom9/-skb?

  The force that keeps you from sliding on an icy sidewalkbgmzphu 8-2hs fn.,e1 is

  It's more difficult to start moving a heavy carton from re: x9kxtr 1uuo1kb6j48 wfnh(ost than it is to keep pushing it withk 6j1u4t8ow ko9:(xnhfr 1xub constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface t+jlh9rp gdb o)ar4()(friction is present) at 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 acc(h rp9 b+aj) lo)g4dtreleration?

  A packing crate slides down an inclined ramp at constant velocity. Thud1;zzx ( 8bbkkhw3; hos we can dedu31wo;xkk b 8hzzhbd;(ce that

  A block of mass M slides down a frictionless plane inclined at a)tvsn+l khdwx f,j,3 (/(t4+bvo ybgjn angle q with the horizontal. The normw,l+/(vydjb gk3 o)x nvbjst, 4(htf+al reaction force exerted by the plane on the block is

  A block of mass M slides down a f,v,l-hit9y u+p n3i95 gtx wjprictionless plane inclined at an angle q with the horiz+tn hiyptj5 9i-3,pwvx 9u,glontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined+iei:;8o.+7yqg5 ez: x7h b, bmzsl(jzsex sc at an angle q with the horizontal. The gravitatiiojbzy (5 xh:8 les+zxe q7 g+b7 sim:z;sce.,onal force is directed

  Two toy cars (16 kg and 2.0 kg) are re (5n o(0lrlsopleased simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a state0 r5pnos ((lloment which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force nc;i1 cyq2ow)ojysid + .5 r)pis applied to the object, and it ac.o)dn)2r+ipwq ios1 cyy; c5 jcelerates 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 ik5/19mz9,yswbngz bck0; xss. What is the average forward force o mk9gwx,nsz s 0;cbbk9zi5y/1n the car?

  Starting from rest, a 4.0-kg body reaches a s-c 2bc +hjqb9z,r)5wpb j c sqtt2xc/7peed of 8.0 m/s in 2.0 s. What is the net force acting on theschzqx9bq+ rjt5 cp j7cbwbt) ,2-/c 2 body?

  An antitank weapon fires a 3.00-kg rocket which aws i8zthvy0yj4p/w2 (cquires a speed of 50.0 m/s after v8p4(/z2ihy0ywtswj 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 yobv;/n3 xff,t au push a 10-kg mass from rest/f va fbxnt;,3,

  What is the mass of a person who weifqi0 7e,wyu y- *xq7xdghs 110 lb?

  What is the mass of an objeih6ml q.tj c6 s3qfepbpv)+94 ct that weighs 250 N on the surface of the Earth where the acceleration duec jtb9 l hepv. s436p)qq+f6mi 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) )q8j:6r2u vwunx/uk .vno cj object on the surface of the Moon where the acceleration due to gravity is onlnnkqurxjj. )uv vw6/:u2)8ocy 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighq,y r j pq+;a5/xz9b oodw3(hws 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compwybpw/q 5,zr ;qoj+xha9d (o 3are the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite end tt+/c qwf/bz*njn-3es of a 5.0-kg rope. Sue pulls with a 15-N n/3cw f+/j q-zb t*tneforce. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests owfi6wkw.bmi*95evbl58 j br) n a level frictionless surface. A force F acts on the stack, wb jebfv w5i5*mk98b)6lir. wand 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 stand- ol9re 1ud7neda:b fa2)ob2xs on a scale in an elevator. What will the scale be reading when the elevator is accelerating downwab 9o :adneulradxo7e2b)-1 f2rd at $4.00 \; m/s^2$?

  A person on a scale ridesp o4 6it(.d7yibse6ck in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceler 4bi dp7ey(ks 6octi6.ation of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevaw* 6 7s9h4:nwcg jagtltor. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceler*9w4 tjwh:gnl s7 6cagation of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-k c5u)o gah+biqtx. ..vg mass. One force has a magnitude of 8.0 N and i.hxoa5 u+.bcg qv)ti.s directed 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 thev4/ h;hixoazn;w e6x4 flatbed of a truck. 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, wa ;64in wxv;ho/ zh4xehat 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. It is held p7ckam4u-/;jielj g- in place by metal brackets th 4ma ;7glp-j-ujei /kcat 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.p1 x4qb6 .m-*oz ffugf 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction andogp.u- *6fxq4mzbf1 f the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and zb678pw43mb1dn0qltc n yy, em = 0.40 kg, what is the tension in the string? (Ignore fric6b8q7, ywnctdlemb 3 1p04 ynztion and the mass of the pulley.)

  A student pulls a box of books on a smooth horizon;0yfepxud0 y ai-c 1y1nao5*ka2l l+qtal floor with a force of 100 N inqe lln0ixaa1k -ayf*+yc5y20u ; op d1 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 horizonr.zuph1e;w /e7 *c jcw *fdq*qtal floor with a force of 100 N in a .ruq j/*c1 qwdpc efez;w7h** 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 a8yxemy;oo4 4nn+oye* s shown in Fig. 4-2. Wh n on8e4 o;*yemy4x+yoat are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, wh(:lyxo w(iw/r b- ku.mat is the mass of the traffic lyo(( i-rwwukb. x:/lm ight?

  Two boxes of masses m and 2m are in contact with each other onr0 oq1/:uq9-ff2mu-x7;rtpys j ff nr a frictionless surface. (See Fig. 4-3.) What isq-omju2ff;rfryqu1-9t /0x f r :ps7n the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact withblfc9x8 )nhp.wr,:x)0jjhtsm 8 dxh7 each other on a frictionless surface. (Se: dhjch 0)hx8ptj) w,.xrbf7xl89sn me Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and :-xm44slpy )wtt73m rv 0 efswo6s ;hw2m 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 connectist e:xww6 7 4r -so)3pfl0 ;wmstymh4vng rope?

  Two boxes of masses m and 2m are connected i/f0/nh8sj ygfdi5 49ws:njiby a rope. (See Fig. 4-4.) If the forward force on the more massdsj98sn :i/hfy/f 5w 4ni0jgiive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. c7u,/b y g+v)whtf(f hBgyu7f/c+h) bvfh(tw, ox 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 static and kinet w,clo6 lkl1.gic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. Wha6owk l,c l1.lgt is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.50 anq(ckjx d;c* 0ud 0.4;quxj(0 cc*dk 0,
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 surfac ioyppvd 10g r;v/u78ne in the +x direction. It slows and comes to a udi ovpn/r; 187p0gyvstop with a constant acceleration 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 3)xtnxvclz d d;7ghz/2wm0 .gforce. A 3.0-N friction force retards the motion. What is thec;.v7n z2gg hl)zd/3t0 xmdxw acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from4r5iqmw4n/kq)*kft;gc -)zfc8ub-cr2i y dx 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 slids: zvh.sc b- k)dqm7e;es 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice;md h e:qk7 .-)zcsvbs?

  During the investigation of a traffic accident, police find skid markbb4 k/upq.:7i689, dqouq(8bddzm/ pveute w s 90.0 m long. They determine the coefficient of b,d wzuudq.7 :i8e o dt8/pqebp49vq6 /(ubmkfriction 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 stacked. (See Fig. 4-6.) The5avqgg -na1lrtp -.n, surface between the more massive la-- aq,r.g1g5tnnpv 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 friction force on the less massive box?

  Two boxes of masses m and 3m are stas,w0,yi*9s5g 0pms3mr/ bkc v hhx jf-cked. (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 coeffic xk ,sw5,0 0 fbhrjvmcghs*mi9s/y- 3pient of static friction between the boxes?

  An object is on a frictionless inclined plane. The ph /xd2 jc/b+w-2wka oklane is inclined at an angle hw a/bkxco j-2+/2 wdkof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hqjjbgk8-) +fuh+cjl d ,x- a7jill 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 with an a isehu.h4g1 q/ngle 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 tilted at an.o-r4q6p zx, s0f+qfh,e krgs 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 cxs:qa +7-ogu .si.y:k6qnxy zonstant velocity of 6.0 m:ux. k+6zq-7x :q aiyosn.syg/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 a rou,4o0du pmbope4)i l:p wc (i23yqfv0q gh $37^{\circ}$ 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 gju4no-(g sybt:32 gzg tgo7-n 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 l8js.o)n3zutms2b p;kby 4 (g eog weighing 500 N along a rough surface. The cable attached to the log mako.;u8je gbb42t)3z ps ks(n ymes 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 92s(zlyl0,wfut 6 oqt a rough inclined plane tilted at an angle sy (t2twzl foul0, 69qof $33.5^{\circ}$ 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.:6ms3y3r-w w/na x7 te tt315x tgaxxo The angle of incline is gradually increased until the object beg6- otwx3g aat:3yt/3x51rxs x7mwten ins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?