Which of Newton's laws best explains why motorists h eshjtz06 u36da0 ,:f:2vtdo s vz0meshould buckle-up?

  When you sit on a chair, the resultanxoh h3a6d1av 4t force on you is

  In the absence of an external forz x*+udhkzk8ury 9cb ,d3y-y6ce, a moving object will

  When the rocket engines on the starship NO-PAoxx yd5n 4n7twh+ 3o)b,drdq.IN-NO-GAIN are suddenly turned off, while traveling inbrd)x,qxy7+no53d h n w4 .otd empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed.8.fx.q ump, dh It is far from the gravitatix ,pfu8hq ..mdonal effect of any star or planet. Under 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, fac+xp18tx 1ok lring forward, and you suddenly fall forward. You can imply fro o1k8t rlxp1+xm this that the bus's

  You are standing in a moving bus, facing forward, and yo2c4 q *ywtl*nku,ttm1: xcp-yu suddenly fall forward as the bus comes to an immedia* : -2lqwcyxmypku t1tt*cn4,te stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the4lmfi w5n*8. qmy5jw (wnrg9 s object.

  The acceleration of an object is inversely proport).,9je zqzs) :fofdg lional to

  A net force F accelerates a mas2kb45o4flhbd:( io kls m with an acceleration a. If the same net force is applied to mass 2m, then the acceh lkk:4f5oi2 4b(b dolleration will be

  A net force F acts on a mass m and produces wvjjb : 2t83tnpun(i1an acceleration a. What accelerationtnp 1tbv w3 nu82j:ij( results if a net force 2F acts on mass 4m?

  If you blow up a balloon, and tpk. 8xr0cpkdanz 28d4 +57mqt0dt jl jhen release it, the balloon will fly away. This is acd08 mldrk05pzj4 .dt7n +kj28ptqxan illustration of

  Two cars collide head-on. At every mof4. u5swbys+7bdui4 w qq7r2kment during 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 on the first. Thwi7rub5bsq k4. u47qd+ f s2ywis is an example of

  If you exert a force F on an object, the force which trz1/ql l4 61 pvqsyv,lhe object exerts on you wil1vqzr p4l,1sq 6llv/y l

  Action-reaction forc r uo pgk314r2c/o9duhjcul/4i w/5th :8pfrxes

  Action-reaction forceslkvctl1jj s: rx/:l)y-2u ;hq are

  A 20-ton truck collides with a 1500-leb. ri046eui+m0if w/ zq 56kisy is)yb car and causes a lot of damage to the car. Sii4 qz)iy s b.5ir+ei6e6y0kf/s0m wuince a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls20nph3m7nui bj+1 j kc on this object with force mg, which we will call the acubmc k1npj3jn0i2 +h7 tion force. What is the reaction force?

  A child's toy is suspended fn51md*-)qw ,bkn cu6mr9ihd krom 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 is the "reaction forceh q 659,ud-kimbm)* dkwcn1nr"?

  Your bat hits the ballbqr p l :ckp+;kr0ti7vr* 9hu: pitched to you with a 1500-N instantaneous force. The ball hits the bat ip9v: q + l;rk7bpuh:c rk0*trwith an instantaneous force, whose magnitude is

State Newton's three l( .uo.mlr/b44 pmbhwraws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which omk;3vil5 k3kyme + iw4f the following is true about the mass andklke;3 35+vimm w4ky i weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which act, 5 +cqsyg)kubs at a distance is

  Who has a greater wep) xvwpn,)sj*k9cay5 89 cjdl ight to mass ratio, a person weighing 400 N or a person weighing 600 ksv yn, dj 9wac )px9c58)jp*lN?

  A stone is thrown straight up. At the top ,ejm kzs6vtdue3 rxa6yx u.i.c /m/;7of its path, the net force acting on ie7 ez.,mi yjxscu;636x v. dtam/r/ukt is

  A 20-N weight and a 5.0-N weight are dropped simultaza m16q;zrwdf 0 fxo1-neously from the same height6ff ax;11r-dom 0zw qz. Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respect0k6.nwhc 8eyh1s b) tpive terminal velocities. ky8b6hw. te0c)shnp1 Which object experiences the greater force of air friction?

  An object of mass m is hangingd.;*g .or bez4k fyjdtw-/ff4 by a string from the ceiling of an elevator. The elevator tfwg44 ofd.r/f-z.y*ekb; j dis moving up at constant speed. What is the tension in the string?

  An object of mass m is.zg4tyykjnm 3h86e ee rcn( :zspczpd0825 x6 hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the strzet ezym53ccg p086pn s4 r.y6nhe8xdj k(z2:ing?

  The force that keeps younf(aw+l6 4 o g+vdq 8wxp,;suu from sliding on an icy sidewalk is

  It's more difficult fl dmizg4q0 4:yu.5 bgto start moving a heavy carton from rest than it is to keep pushinq540dym: iul g f4.bzgg it with constant velocity, because

  A horizontal force accelerates a box fromn l8n 87trjetlkc 7*v* rest across a horizontal surface (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 accelern8* j87r *7kvcntl telation?

  A packing crate slides down an;8, ozgpku dybaf06 8e6hi b-u inclined ramp at constant velocity. Thus we can dedk z ub6e-8bi;y0a68ugohd, f puce that

  A block of mass M slides down a frictionless plane inclin+m8dj/hat cp (ed at an angle q with the horizontal. The normal reacc+ jh pa(d8/mttion force exerted by the plane on the block is

  A block of mass M slides down a;o pbwknc(b0cu : *6z-40hsxiiusz1k frictionless plane inclined at an angle q with the horizont w1us-: 6kch0i; xpkbz bu40*(zicsnoal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides nydz,,d0(su;+qj19wi9 yc dj- cicaldown a frictionless plane inclined at an angle q with the horizc s(d,yz9 duw;- a,ql0+i9 i1dy njjccontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultanua;mafc o)k0 nfsr*;7eously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being releasedu; f;mk 0ar7f)osca*n .

  An object sits on a frictionless surface. A 16-N force is applied to the objr3vk sb(x d+8 -y qcdoj eb77ns9k;a.rect, anrbq+ca sr-y e98bjd; 7 3kkvndo(s.7 xd 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 resk+n1i e j,ne w zr0fo7f1*l 9s4h0orudt to 27 m/s in 7.0 s. What is the average forward force on tn+kdh1e 9rleor7 f *noj,01f su4iwz0 he car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. scyli3g3 -mi)What is the s-m)3iy 3 igclnet force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquirlg74.*;zpr sqxi2 zgses a speed of 50.0 m/s after travizp;2s7*g4 g.lsr qz xeling
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 forj2(6v 7bpcxl:uq*z 1(r)rmdzuh(a mcce that you push a 10-kg mass from res((d12zu cl mzrcu *parb6 m7)h(jvqx :t,

  What is the mass of a p6ifzdp/.v1hek 8 r.tmerson who weighs 110 lb?

  What is the mass of an object tharu5wsov,+ z u,t weighs 250 N on the surface of the Earth where the acceleration due to gravity is + s,wrvuuzo,5 $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. Wh8bbmw. 6wp//aia b-;vj 60r dmopgqf2evg )4xat is the mass of the object on the surface of the Moon where the acceleration due tv/ag)iv-0x qgr bo6wmf 8dbwb;4ape j 6m2.p/o gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 44efiln* :qvg ri,ie/tm l;z3wwn+x-50 N on the Moon. The Moon's gravity is im;/q lfl5er,gii3:tz wn *v+w4nxe- one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are havxa 64wln in;e3ing a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue a nnxiel 4w;36at $2.0 \; m/s^2$?

  A stack of books rests on a level fric:me0iz 0gyj*r tionless surface. A force F acts on the stack, and it accelerates at e0mj :0igry*z $3.0 \; m/s^2$. 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. xa,m3djeyg,ijdtu89* (un 7a What will the scale be readdgx*ntajdu 8(3u9eia,jy 7 m,ing 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 person i ay;*w/lro. vks 60.0 kg and the elevator accya lrvo .kw/;*elerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an e*bsc/*qd+h m5n6; ejo c4hsk hlevator. If the mass of the person is 60.0 kg and the elevator accelerates upward wish *s4h *qjo;c/ +eknh5 bm6cdth 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 2bhydv2cm .c/magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is 2 2 dhbcc/mv.ythe acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed ofk8 :;tvk ws r9bldnz./ 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, what is the minimum stopping distance if the loadwn;zs.bv: 9dk kt8/lr is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck xd-j8avj5q-ifgx0k s;zio33. 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 sl5s3d-;kq i -jgz80ai3ox fx vjide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0;upz8vl/,aw;ebk4z q.40 kg, what is bue zp4; /8wvk;a zlq,the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-61fxr 50wq+f j, v zajev)r5jt1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass e05ja t f+ vj5z qr1xwfjr6,v)of the pulley.)

  A student pulls a box of books on a smooth horizontal fl ,2jn 9mhukg yee++cbnx 9fh59oor with a force of 100 N in a directcn9+ef g9 2 5+bmeuynjxhk ,h9ion 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 forc, dlfh xl/m2l,fdte0hf( p3.m e 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 the normal force on theflf d,f230 l(l,pmxh/ etmhd. box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. 4-2.:x .u)fyko ni(bi8iy htq 2j+2 What are the tensions in the ropexnb.(hqio)j k :2iy+2fuyt i 8s?

  In Fig. 4-2, if the tensions in the ropes cah4(cz-1yr qj :dxx2;srzlf6 q:x-y are 50 N, what is the mass of the traffic ligzyjs z2q6:c 4:-xdf1 rlhar(xcq- x y;ht?

  Two boxes of masses m and 2m are in contact with each other*bc()5gko wjc 4myt v6 on a frictionless surface. (See Fig. 4-3.) What is the accvb y6mgjkc cw()t45o*eleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless -lm f*/ +fmvzmsurface. (See Fig. 4-3.) What is the net force on the more m m-+/zflm fv*massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Ficx6t3; cd kt:7jkf1z dg. 4-4.) If the forward force on the more massive box is F, what is the tension in 6xkttzdd;c: k c7fj13 the connecting rope?

  Two boxes of masses m and -gh-z 3ed hag0n qy-pj2+4ryemid i0 -2m are connected by a rope. (See Fig. 4-4.) If the forwar0pzg-m-+r02e4iiyn ehg ah3y-d qjd-d 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 pulle*2 j*4guyoginij h1z+ y as shown in Fig. 4-5. Box I of mag2 ih*io*zg4 jjn+yu1ss
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 7:qkw-/ t2edm):fy:eoq1a kn+2 fc l. htnatr3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box1qakon2d :a7.ehyqtec )mlkt/w+:r 2n f:- tf?

  The coefficients of static and kinetic fr:kp.ekgc: o 7 i xhpd8e1m)q4tictions for plastic on wood are 0.50 ankmpx k eh7iqdc1et::)p8.4god 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 sux8oa o9t.qf4*jk(o rfrface in the +x direction. It slows and comes to a stop with.o(jxoato*q48 rkf9 f 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 h (qm x1wz*phii(nm1 s.orizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of themsn*i(hw . 1 z1(miqxp object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rate yif e(s y u5z1hg9;k/hof $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initial4r a lj qkyu0:zcckrt5ayv8ibrvzl +/- 26a(, speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friv:2a ( u/+5kt-rrbl4y6q,za cr kciaz lj80vyction between the puck and the ice?

  During the investigation of a trwj e6q*h we1v9bn u(f.affic accident, 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*9jq weu.6web (1vhfn conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. sv a7 m+9i)p ilb2p72cup.m xa:wdpi4 (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 friction) pm77is.4 a:x lapi+92u ipbmdcp w2v force on the less massive box?

  Two boxes of masses m and 3m are stacked. hcjns2/1,xzqq71w j0gx7,kttk7 v kp (See Fig. 4-6.) The surface between the more massive box and the horizontal sur2qhxcw / t7177nkpzqg ,1j0 xk,tjvksface 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 the boxes?

  An object is on a frictionless inclink/,qcy:*a + vkdeeocb2-n (qr ed plane. The plane is inclined at an angleevcbe/: +ra*2kyq qkoc- ,n d( of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill tsu mpwj p1; u16s;c)ulg 7cu2qhat 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 ayfwo8nx fo,4)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 ae:t dc3yj9vv; tur4b:t 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 dowq5s( x /vw)5, f(polw:j oielnbc7d8an an inclined plane, at a constant velocity of 6.0 m5ca8ef5( nox(lv/d wol b7w jsp),q:i/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 sli0f w/4pnvau)hocs0qvw7 u+7ew5s. a ides 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 +7ngdvf 2s2gqu/h .p: sc-ujs 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 Ncrixkll2p o8.:3t d569pnukr/zm.x e along a rough surface. The cable attachedz2 n. r.3 p6ulx cr dkxkplm9e:5ito8/ to the 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 in+cva9b8 c t4r,;tmk ilclined plane tilted at an angle ofa+tbl4 ckic89v;tm, r $33.5^{\circ}$ 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 incline is gy7oguc l/j :-p0dbudt1wq(i1 radually increased until the object begins to sliuu p:by- wl0gqic17(/dt1j do de. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?