Which of Newton's laws best explains why motorists4r(g bsgly /1o +mtnz ,6ttzee m).mg3 should buckle-up?

  When you sit on a chair, the resulx .fwh3;ku dd8tant force on you is

  In the absence of an external force, a movin *8 us1x5f1((jtqdnzk: hfcr/d pen) eg object will

  When the rocket engines on the starshipyjo..2 h 3xhnh NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starshipjx2 .h3o.hynh will

  A rocket moves through empty space in a straight line with constant speed. 1ld+ 6:usvhdj It is far from the gravitational effect of any star vj d6 :slh1du+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, facing fojmuc4xcg1xa,vn*7 0u8ci a2m2ja 6dz rward, and you suddenly fall forward. You can imply from this that thecxcu 61gadaui ,ma04j2 8v*z7j n2xcm bus's

  You are standing in a moving bus, facing forward, and you suddenly f26 (ubv,/s1z tdezthkall forward as the bus comes to an is6dzthz ,t21 vk/e(ub mmediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the object/ 7rzu4yyn;vdo7p/. zg pd-nr.

  The acceleration of an object h:hwk/l +tokizb 86q) 0m ub2.gh2 drhis inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same 4l1v 7qmjt dqz/cvq*z1mb,* -+besutnet force is applied to mass 2m, then the acceleration wv4qlb 7q+v z mbme/ *t,dzt1*qj ucs-1ill be

  A net force F acts on a mass m and produces an acceler/v :o ya/gexc.ation a. What acceleration resultsy/vg a /.oxc:e if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will flxde; zmz t2zc s4u.cldt t8x(i+h02x2y away. This is an illustration oetz+ sxdidzm22xx .c802 uh(zl4ct ;tf

  Two cars collide head-on. At every moment during the collision, tbxlu ;,i 1s+y( cso(ajhe magnitude of the force the first car exerts on the second is exactly equala(o(; ssj1i,+u cylxb 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 ob4rd p6,leh 7qrject exerts on you willl ,76 qe4pdrrh

  Action-reaction force (62:4x0ssrd3qze)lilf0uc6 wmw:e go 1uicms

  Action-reaction forces wluv/xb xs b48k pz/.8are

  A 20-ton truck collides with a 1500-lq 38bv xlyvv9agehkh q6 2r:96b car and causes a lot of damage to the car. Since a lot of damage l k8v96va 29b xyghevhr:3 q6qis done on the car

  An object of mass m sits on a flat table. The Earth pulls on thy wn;nj9(xvt+g .bk2 his object with force mg, which we will call the action force. What is the reactionbwyv j.(ktg ;2xnn+9h force?

  A child's toy is suspended from the c jen6o8iqmq4v(t6 .d leiling 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 fo6o.j 4t86evndlq mi(qrce"?

  Your bat hits the ball pitched to yo csjmwb 9le5a4)j z*htmh h3*9u with a 1500-N instantaneous force. The ball hits the bat with an insmj4 hwjshm5b)9aeh* tl *c9 z3tantaneous force, whose magnitude is

State Newton's three law628u)3ih 7crvsyx 8wz n.hr-ne xb 7rps.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than nt( jhx,k y:tbtu9/l 8on Earth. Which of the following is trtb ,jh8t x9nulkt /(y:ue 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 /r 2/jkj;q w5sry t yk*x:d)zvdistance is

  Who has a greater weight to mass ratio, a person we4,3ef2c5x :v mo e4fozwwcq1:zlsy4cighing 400 N or a person weighing 600 zs3mz4fxv:w oe,l yoc4qc:5w4e 21fc N?

  A stone is thrown straight up. At the top of iurtxh*n:g1- kdu di+/r w 12wmts path, the net force acting on it i 1m u1x/dh+:tr-rdn2gk wi*w us

  A 20-N weight and a 5.0-N weight are dropped simultaneously,6uj)-;lfbe c. xvj x(en7jm b from the same height. Ignore ajx)nee7mx,6b j.uljc vf(;-bir resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respectivevhx k*qmpz/q g b4a5k81 e+ob5 terminal velocities. Which object experiences the greater force of air frictmvk4bzgh8a1qp/5o5x q+* kb e ion?

  An object of mass m is hanging by a string from the thz+pr4jgf:x3: s otru o0/u /ceiling of an elevator. The elevator is moving up at constant speed. 3+g/frh sorpx: /u0zojt:tu4What is the tension in the string?

  An object of mass m is hangibv xf o7)ha6z,ng by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tensionz)a,vob67fhx in the string?

  The force that keeps you from sliding ow1- o+i 4c7u7bif lmzyn an icy sidewalk is

  It's more difficult to stag m)a kl;;q o//nwjz1qrt moving a heavy carton from rest than it is to keep pushing 1;z)w;lkj/nq /omga q it with constant velocity, because

  A horizontal force accelerates a box from rest across a horiutl bwd v0.r)6fx, 40 swnpqs1zontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exceptio.) d40n1bw6lss0wxpq urf,tvn that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slidelixbwy81 73l7 b: klirs down an inclined ramp at constant velocity. Thus we can deduce lryx:w 8i7i k17bl3lb that

  A block of mass M slides down a frictiodw urza*65oy4::rl w gnless plane inclined at an angle q with the horizontal. The normal reaction forcedr lu:wroy:*gw4z6 a 5 exerted by the plane on the block is

  A block of mass M slides down a frictionless vrw3nx+ iy y 78z:jh7zplane inclined at an angle q with the horizontal. The normal reaction force e 7vxzir8j+nw y 7hzy:3xerted by the plane on the block is directed

  A block of mass M slides down a frictiqe*qm go:p-c2onless plane inclined at an angle q with the q*o g2 :qm-pcehorizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined plan3itjwvb:0n 8-+jnx y oe that makes an angle of 30e with the w-+voni xj8y0n3 tbj: horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless sur olfj/6 1tfdhym+s 1t6face. A 16-N force is applied to the object, and 6lffohs1y 1jmtt /d+ 6it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 ai9jmk0z0n :wkg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward 0 0im9 nkjaw:zforce on the car?

  Starting from rest, a 4.0-kg body reaches a speed ,qit viw5;(ya of 8.0 m/s in 2.0 s. What is the ne,;(iiwav 5 qtyt force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/sua 3.ixcozr gyz qe* rk-/lh:-jnks 1l131qw 4 after travelinsk 1c x-gr eul* -/kl1qqa.r1n zio zyw43j3:hg
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 vl +7uwfllkjq4 kgy;*(z)b7 kforce that you push a 10-kg mass from rest,wyv7jkkqgkb l u*(7llf)4+ z;

  What is the mass of a person who : a6;lpvx5uvj weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the a t3svwf.* -ank1 tp2cEarth where the acceleration due tokw.afps3t1tn 2-ac* v gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object af6uy,:ssujugw0.b9 on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Ear ug:jb a0sysfw9.u6u,th?

  Object A weighs 40 N on Earth, and object B weighs 40 zs2 +n9amyybwbm:. 8eN on the Moon. The Moon's gravity is one sixth of Earth's. Comyenbm+.swz 89: m2byapare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on oppo79;)ayv8*1lq 8gkdq jhu oe jrsite ends of a 5.0-kg rope. Sue pulls withk1; 8*9ejr ul 78jqg ohd)yvqa a 15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books res -x+ netyja0f 0-49+tedfwnbu ts on a level frictionless surface. A force F acts on the stack, afwt0ftne 0x- euan4+yd+- 9bjnd 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 stands on a scale in an elevator. 7k7*x x l,yrk7ky/w ur What will the scale be reading when the yx7 ry , kklwru/xk77*elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the perc 8k(g+q8 wzqhson is 60.0 kg and the ele(gq8 ch+ wqzk8vator accelerates 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 elevator. If the mass of t,a6n(yh9 qc oqhe person is 60.0 kg and the e(ocqah9y, 6n qlevator accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forcerg. .8m*kao aqs act on a 5.0-kg mass. One force has a 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 the acraoq.8.kgm a *celeration of the mass?

  An object of mass 600; mmdxdcsa2 870 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N.d;m2 7a8 cmxsd 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 rest +hdu5xrw.zk6 owx5f.s on the 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, what is the minimum stopping time if the load is drwuzx 6 .wh5f+5oxk.not to slide forward into the cab?

  In the Atwood machine shownkbj83 6e*omzx0, p xlm 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 8 j0* mo3,belx kxmpz6the mass of the pulley.)

  In the Atwood machine shown in Fig. 4)r 47zblv ugn (+z pig)nul;d(-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction an)zgib ();z+4rv(nuu7dpn g lld the mass of the pulley.)

  A student pulls a box of books on a smooth horizo7 sf00j;er ksuntal floor with a force of 100 N in a j s0f r0s;ek7udirection 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 floororg7x2wy is-yw i36e) with a force of 100 N in a directio3osye6ii)7-yx2 ww rgn 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 as sz/ v7(p ko*fjxya3ho)hown in Fig. 4-2. What are tyop)3*ha/ v jzf7(o kxhe tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the tra9(xz)x r1qn grmy,he/ffic ,qryr h /mz)x(g9 exn1light?

  Two boxes of masses m and 2m are in contact with each other on a ug)u/)w3fyx4 izxzz; frictionless surface. (See Fig. z3z;xgz u )/)xyif4uw4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless+u* /l3hk;u ljct zit( surface. (See Fig. 4-3.)*j;+ 3lz/hcutil(t k u What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected byyqbj4khru19 9 )x5juf a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in thfrhu15 b u)jxk49yj 9qe connecting rope?

  Two boxes of masses j4wva/ zvt0 n9m and 2m are connected by a rope. (See Fig. 4-4.) If the fo4t 0/jv wanvz9rward 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 pullep8p-9ie d ),f9swoxn okk ewpyea01:7y as shown in Fig. 4-5. Box I p ,) so97n pw0k-fwd kei:x1p8o9e ayeof 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 7x v +zi,hu2 kp8k-/5h w5lbk5nst5bxege7dibetween a 3.0-kg box and a desk argxpth,shb kb 5+wu2 e5/zi8ln k7d -kve557xi e 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic ful +xaxi*t4v +rictions for plastic on wood are 0.50 and 0.40, 4+ axvlt+x*ui
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 le;bt l+n w :wp; . 3w:go8 zsp:yya1oh)oaprq:vvel surface in the +x direction. It slows and comes to a stop with a constas)y8ytw oahwgboq wa;lppn: :3v: zr p+1:o;. nt 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 avy g)w5pff10 n 5.0-N force. A 3.0-N friction force retards the motion. What is the accelerati)wyf n1v gp05fon of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a 61h dgby+0 2yxihfggi c4rz 6.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 o6j7 orz4eyy ** go;ch+x4t :y -o(wwklxwn4s jf 10 m/s. It slides 50 m on the ice before it st; 4gt cr*-y6 nxyo7yx:ws k *4h(wjoeo+jlz4 wops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 m-zoczco u*jo4y*vmi20m jrx94x;a.n long. 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 c04 za .jo2r*c z xnjyxumvom;i4o*9-the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See F 9zk+s1 e y1/ziktz1woig. 4-6.) The surface between the more maszzk/is+w1z y1ok9 e1t sive 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 stacked. (See Fig. 4-6.) /h ;o iawiuc*vwp97 *hg;c5bhThe surface between the more massive box and the horizontal surface iso59i/iphaw h; ;cv**hc 7g wbu 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 yv:x rif*6 6i ijg4lk+inclined plane. The plane is inclined at an angle kg *ijr+6 6 l:yxv4ifiof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mryt 1szh )9(twes,t. kakes 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 smo bo9c26db+yie4 hmy8rqk 9a0xoth 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 uq-oj 3e*v5i co1x g1;)giref 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 directly down an inclined planea j43 vsg (*tomh9 me(,f: e9dy,cfu6h d;zsrg, at a constant velocity of 6.0 m/sg h:3*th,dcjva9;m,z9od y4(r(uefgs ems 6 f.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass vpa2;nv61k1eq6oo a s m slides 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 slide h v;hv29jdnt/s 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 wei tw408gm6rnfdw1 jb8 qghing 500 N along a rough surface. The cable attached to the w16njwrt8fq mdg480 blog 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 rest9z( :iq0grpj4b7bh0i dcq / rx on a rough inclined plane tilted at an angleb9rcj4 0 hqb i/g q7i0(pxrdz: of $33.5^{\circ}$ 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 ispt; y/ovfwz uvxb 9iir5ne0;wr/ 2a7 * gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static f pwf/ wuxr;2itbeyvoi 90a*/v 7z;nr5 riction between the object and the plane?