Which of Newton's laws best exple2vm7x l /a,c j6i5g v+:eypshains why motorists should buckle-up?

  When you sit on a chair, th cupafbzs-wm 9u/*3ff4 oln,- d fq*+ve resultant force on you is

  In the absence of an exsm-6. y6 pizydternal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tunja+s- 0+upc kjorca.p :q+ mqtsn195rned off, wt5 +mncp+1:0pqkuoj n. q car+sja s9-hile traveling in empty space, the starship will

  A rocket moves through empty space in a straight line ec) v ub*ea8hym, lug9p3fjt-h*+ ys( with constant speed. It is far from the gravitational eff fusy gum8p-abl9hh * *eyc )+je3,(vtect 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 movin7hn s;u hn e,9uuboexbg2+us)d-giu( (r (r4ng bus, facing forward, and you suddenly fall forward. Yohu(bo(uuihgsr 2-, g ueeb 9u(4d)+nxnn s;7 ru can imply from this that the bus's

  You are standing in a moving bus, fac--v , vjpgp55mh1zf7vfclb p/ing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused youf/ fplv-pjg5,5 hv7- z bpcm1v to fall forward?

  A constant net force acts on an object. Descrimqnhh382r-fs be the motion of the object.

  The acceleration of an object is invv1 3swahnu02 e6z.i8)dwvz pversely proportional to

  A net force F accelerates a mass m with an acceleruxn vgvst+k* )u*q-kj-5o8 beation a. If the same net force is applied to mass 2m, then the acceleration will b* t kuvve+8un*)qg5--j xs kboe

  A net force F acts on a mass m and produces an acceleration a. v b)w2s9qx;x: lz*4bmlxuyd,What acceleration results if a net force 2F acts on mass xl b9,swdbl;x4m2* y:uq )vxz4m?

  If you blow up a balloon, and giil.lw qe (-6nm9 (v3gjzzj ht/+e 9zthen release it, the balloon will fly away. This is aiin.v ((/z-hwgl96emjlg zt 3j +qz9en illustration of

  Two cars collide head-on. At every moment during,9zgihx y3;m7myw vm7 the collision, the magnitude of the force th7z ;mm9yihyg 3m7 x,wve first car exerts on the second 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 which0a ieak *b (.nbn):kuyot.m7v the object exerts on you wilb.a7.ybm v(k)kn tane0 o ui*:l

  Action-reaction forc)n*.te bo5 -e -nzm 1zvdjaw6wcxu)a-es

  Action-reaction forces aregypnzt(h()e /wwkjom n)a 0+m/9*7 xu5qhbv r

  A 20-ton truck collides with a 1500-ltari+l8t zfx :a:; 8jab car and causes a lot of damage to the car. Since a lot of damage istjz :x+8il ra:f8at; a done on the car

  An object of mass m sits on a flat table. Thrd:bb (+6xzgj6m2*hcz w) u)mzuooq+ e Earth pulls on this object with force mg, which we will call t o (+6)*6zb)h ugrmmjuobz+dqcwxz2 : he action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The z31i:bjyz g6b Earth pulls downward on the toy with its :zbz6 y1ijg3bweight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched eg, d 0sfni4eeahz kh*k9 30t(to you with a 1500-N instantaneous force. The ball hits the badg0ih*tshze3k 4 ee(f9 k 0,nat with an instantaneous force, whose magnitude is

State Newton's three tf v5b:swe, +rlaws.

  Mass and weight

  The acceleration due to gravity is lower on the Mor)s79k i56j kj 2yiuccon than on Earth. Which of the following is true about th6kjrjcs57iky 9 ci2)ue mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance 76jveecu f, pmi nn79jzv3 q/z:2ud,dis

  Who has a greater weight to mass ratio, a v7i zef xl6k)2person weighing 400 N or a person weig7i) vxkf 2zle6hing 600 N?

  A stone is thrown straight up. At the top of its path, the net0z j1m/*4vyij8jhs ro fkhqt6t9 f;n0 force acting on ivk*0/; h r4tz1t 6qjmy9sno0i 8jffjht is

  A 20-N weight and a 5.0-N weig01iv.b( ,w0 ifnu oct.qbe)enht are dropped simultaneously from the same height. Ignn ) 1(i.0.f bucbt0 qvewie,onore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth b:c d)aj8srrohj15 k ,at their respective terminal velocities. Which object experiences the greater force of air r 8dokcjj r)ab, s:h51friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. The y0gcbe 8yo9s0 elevator is moving up at constant speed. What issb0gy ce8y0o9 the tension in the string?

  An object of mass m is hanging by a string al71g gqs1un 9from the ceiling of an elevator. The ele7ng1sa 91 ugqlvator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding o nvn*drc*6g ra2h(il1 n an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it iy19 kly uc;lu(s to keep pushing it with constau1 (clyuylk 9;nt velocity, because

  A horizontal force accelerates a box from rest across a horif (mrg5,0xt pibigu,+ .vbirl; 4iit6zontal 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 h0l4uv,rm( i g. +56bi ,rtiix bft;igpappens to the box's acceleration?

  A packing crate slides down an inclined ramp at consta4c.tw5p9lpzwl9/cz9 xzp ; ywnt velocity. Thus we can dedc9t zyz/wz lwp ;49 l5xpcp9.wuce that

  A block of mass M slides down a frictionless plane inclined at an angle qrl)bhi+ 8 v7 da(n -.op5/ttatbd l,yl with the horizontal. The normal reaction force exerted by the pla n+/)dal75oi ld-tp8trh.bvb (,tly ane on the block is

  A block of mass M slides down a frictionless plane inclined at an anghoz/ u o7p+o(wle q with the horizontal. The norm(owpou7ohz/ +al reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionlx tva)yj1rc6 3ess plane inclined at an angle q with the c6xa y1jr)tv 3horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simu5(yw: qsn z)jwltaneously on an inclined plane that make: yqw( w)jn5zss an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionm+5z q,v7ur guless surface. A 16-N force is applied to the object, and it acv7q z5um ,ru+gcelerates 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-mym vy )*f1bn s. What is t)b*1m m-nvfyy he average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What iw wyxy2 h5u.f;s the net force acting onwfuwy2h5.x; y the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 b hnag21pgq4473-kwha uqnzy 9s z: g8m/s after qqh 84npay49k3u g -ag2z7gsnb w:h z1traveling
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 vfxfi;p q/4auqo))i 310-kg mass from rest,p foixu;)/34) qvaq fi

  What is the mass of a person who weigx:cdqv-nd knm339 dt *hs 110 lb?

  What is the mass of an obn dq r6.l.a+xnject that weighs 250 N on the surface of the Earth where the acceleration due n.d.n +6rxaql to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg onk 1bz0 6 zb oua3nugtnut-7xm)w4n2j1 the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on3ubkb -t 1zjn zng2 o1w)utx60u4nma7 the Earth?

  Object A weighs 40 N onnwn /-ztn8u h)cm( hmje6s 1l6 Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare tz/(hlcnn1)j 6 nh e-wmmsu86t he masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends oflk*ol q 0(j3bqc-zt +m a 5.0-kg rope. Sue pulls with a 1b k ocj(l3m0 zqq+t*l-5-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on ay ik0v)ef2* eb level frictionless surface. A force F acts on the stack, and it accelefv*e 02kbyi)erates 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. Wha-t/l r vh5/ j)vmp1s g1;ifibxt will the scale be reading when the elevator is accelfx/vj 1v;5)rphs l-1/b gtiimerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If tm,ciaa u0)e2fhe mass of the person is 60.0 kg and the elevator accelerates downward with an acceleae2acm)0 f,iuration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If tj hvsv,.e6f5u f y,tfwis-k:7fic1 9 ghe mass of the person is 60.0 kg and the elevator accelerates upward with an acceler5v , t.wi sf 6vskye:c,9uihf17fg-jfation of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass.,mgqx ,1w 0kbie/emedj/k:0x One force has a magnitude of 8.0 N and is diiekke ,xm/mxj0 w,dq bge0/1: rected 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-6o dij7r 4el:. vgiuo 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 disd g6l7o 4o:-uriveij .tance if the load is not to slide forward into the cab?

  An object of mass 6000sng+* a8z up:t 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. When the truck is traveling 15 m/s, what is the minimum stopping time if the load is not to slide forward into the ca guz 8:a*sn+tpb?

  In the Atwood machine shown in Fig. 4y pmh0xjd3 t8za bp,);-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ign )a zpmtjp dhy;,83xb0ore 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 )1f;m7bzc bss1psp tc)iq3u -kg, what is the tension in the string? (Ignore friction and the mass of the pullb 3 itupbs)pss; c)z 117fq-mcey.)

  A student pulls a box of books ( 0ntpwnm5s0 s txcnt6s+7/omon a smooth horizontal floor with a force of 100 N in a di56/c p7tstx(nmsn+otm 00 wsnrection 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 fvnaj 8svhr:)-s qz705hi6 kron a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of 8if:vrr5hjs - zq6v0s)7 nahkthe box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 10 d5m en1v cttq4v*by*+sx36+xvhkh a7 0 N is supported by two ropes as shown in Fig. 4-2. 5xcdqvtx *k*n+36hbsv+4haytv m71e What are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the trav5do.3 t2hucfpf e+4sffic li+ft 2e s34h fcu.odv5pght?

  Two boxes of masses m and 2m are in cont aw2m*nudvz;b8x , e+fact with each other on a frictionless surface. (See Fig. 4-3.) *nmu+ 2abzvx8fe;w ,dWhat is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a;qe8kt i 4 0imfhs;hf* frictionless surface. (See Fig. 4-3.) What is the net force on the more massfe * mh4tkq;f;ihsi 08ive box?

  Two boxes of masses m and 2m are connected by a rope. (S n0+9b2 t0nyw5fn vryree Fig. 4-4.) If the forward +vrb yw09rfy2n5ntn0force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See 2 zgx*ep70eyeoe77, q bs0hxqe:v+whFig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massive box27 e,ox ey:7sx +0qe bvp*hegwe7h 0zq?

Two boxes are connected by a cord running 8j p2f-o gd*g zba( n-qj(:jygover a pulley as shown in Fig. 4-5. Box I ( -d 8bj *z:fgoa-qp2g(gyjn jof 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 between a 3(/x mxzag wxlyhx 6 *q-i4*+g3gbks-u.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box y -gh/ (qubx+-x6wmxig*sx k*ga34lz when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood aro-fxd15h/lfl , wrt d)w ;jg*re 0.50 and 0.40,wo/ hg-,*1t5)r dfxdlljr wf;
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 t9lrpdr:ar 4 o4o a stop wit:44a rrprlo9dh 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 k mb5g5r-a9jk a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the obj5g5 kmr ak9bj-ect?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, aor -qf4+vz m/y5s6wzq:3 cjwrt 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 sp:: rkpj27ltvj(n q 42g6z+q 0uoubje teed of 10 m/s. It slides 50 m on the ice befo:vtqlzton2: ju( 7+jbe2g p6j0kr4u q re it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigatiophohpq q0g:ph- 5x9nd m8*pj /n of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of fr:h5phx9 hnj 0gd-qpoq8*pm/ piction 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.)36sra g: n3hkh9k)a,hv nw *eg The surface between the more massive box and the horizontal surface is smooth and the gkg ernk:*w6h9s3 ahvn)ha 3,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 stf;2u r nbifxk*u795tnacked. (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 slidef*95unuinb tk;x r7f2 on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The7d rjl4 qwhvx 39jz3-8fkbdk/ plane is inclined at an angle wd/3 kjv3f9zr d4j l7hbx8-k qof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that fqp uq r)p/el8(5s:4nkxibp0makes 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 )rjatw6w g)yhnm ;,. ;4fep nbwith 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 tiltegm;ek :nbxwto +8(c,,7er xkrd 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 4fxt 9hwcv;6xdown an inclined plane, at a constant velocity of 6.0 m/ ;9xvcf 64txhws.
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 4jp 0zbwc.ckz 01pcm rlq+9l;-ib(sugh $37^{\circ}$ 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 ro 9kt+4c5 samtnugh $37^{\circ}$ 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 al,hzdhhd 7b; (fnsw9k *ong a rough surface. The cable attached tohf k *sh( d,hwb;7dz9n 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 inclined plane tilte),i5mnysh 6utd at an angle of s)yn,mui 6h5t $33.5^{\circ}$ 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 uzdym x1 z:h0i/v l, :4c-hcdrof incline is gradually increased until the object begins to slide. The hzy/:4r-i 0z, ldhmdu:v1x ccangle at which this occurs is q. What is the coefficient of static friction between the object and the plane?