Which of Newton's laws t wxx8d,/ .zr*d5fiwa best explains why motorists should buckle-up?

  When you sit on a chaiww z+ +l)1ph. /fmoizfr, the resultant force on you is

  In the absence of an external force, a movinolemh9 o*4a 63. xwjpv(:iolpg object will

  When the rocket engines on the starsh+tt flwa6)p ;me ,i2 bkhu3u6oip NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empt2b+h3,t6mw lpk;t ue 6i)aof uy space, the starship will

  A rocket moves through empty spac/z m:w9 trgok3e in a straight line with constant 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 sustain its motion rmtz9 wgk/ 3o:is

  You are standing in a moving bus, facing forward, and you suddenly 1ozeqi p;b( xa7njv*drs )*g 6fall forward. You can imply from this thjd7*o(rxe )q;i*b apsg n1zv6at the bus's

  You are standing in a moving bus, facing forward, and you suddenxa9dr64sb z5g ly fall forward as the bus comes to an immediate stop. What force caus94 x6zsdr5 agbed you to fall forward?

  A constant net force acts on an object. D: tchpeuo8:o9-mr+kd escribe the motion of the object.

  The acceleration of an object is iev - ia,ib-8a pyos*v3nversely proportional to

  A net force F accelerates a mass m with an acceleratiobq f5+1:eg pden a. If the same net force is applied to masef15:p dq+bges 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Wha k)jl, fwj2fb(t acceleration results if a net 2kj j)f wf,l(bforce 2F acts on mass 4m?

  If you blow up a balloon, and the/uxg)fd9un5 ox.4 oanp *o t/en release it, the balloon will fly away. This is an ill. fopaug*t)/ oonu e 5xd4x/9nustration of

  Two cars collide head-on. At every moment during the i/5, nu.arz,d1t zc7 nequv 2sbw(fk7 collision, the magnitude of the force the first car exerts on the second is exactly equal tod. zcu,vaktz5w2 qn17(u, nfsi 7r/ be 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 o mew-ng3un *o0bject exerts on you wiwo3ue0 -nm gn*ll

  Action-reaction forcesb0k/bp iz 38r7 hbn,wb

  Action-reaction force:1bg lrsu7)ihs are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to th4jn6l 3vurv+l e car. Since a lot of rl4lvjv6n3u +damage is done on the car

  An object of mass m sits on a flat ta7yizr3unf9q,s u a ,qte//hojk40:omble. The Earth pulls on this object with force mg, which wyjqaoqk3u/f o9 :nr7,0u4zh /, tmiese will call the action force. What is the reaction force?

  A child's toy is suspended from the ceilxkhz84) p tp;ling 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 tl pz4p8h);kx force"?

  Your bat hits the ball pitched to you with xw0lo2 ;pfrngn3 o.9bo;k 6bea 1500-N instantaneous force. The ball hits the bat with an instant o0r e.;b6f ;g p9nlxon2kbow3aneous force, whose magnitude is

State Newton's three lawsvn 7po8d 4fzb: m.xf+l.

  Mass and weight

  The acceleration due to gravity is lower onq.m8 ouoa3/icz/7 fier1 6je+qlx2fp the Moon than on Earth. Which of the following is true about the mass and weight of an astrooqii6m pf.ucxrz83 ol2a 1/jqe/f 7e+naut on the Moon's surface, compared to Earth?

  An example of a force which acts at arg,uf:5 o /w72b)q pbphih h0w distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or gtvaju:7tp2ruad.*1eo f): y a person weighing 600 N?::. )*t2feujutd o1pgrav7 ay

  A stone is thrown straight up. At the top of its path, the net pnc(4+ 9a 8floookk/ sforce acting on itk9 slo+4f8 a/ok(ncpo is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the sam.15vj:xsdobdr /mg/t,bb) rt e height. Ignore air resistance. Compare b/5 r,d)xd1jt:tsrbbmog/ . vtheir accelerations.

  A brick and a feather fall to the earth at their respective terminal velocitiey i3v 2yg jfh1i8*mtm.**jvtes. Which object expe vim *h3ygt.*emv*f i1jt2y 8jriences the greater force of air friction?

  An object of mass m is d1an) j z yt,o/37lj*thvgr m2hanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the 7,/ghzyljv am*r32 ton d1)tjtension in the string?

  An object of mass m is hanging by a string fsym;8-f.pao +1 eglzt rom the ceiling of an elevator. The elevator is moving upward, but slowing down. What yl-1f mg;+oaze8 p.stis the tension in the string?

  The force that keeps you from slid)cmu . /83qxrmhj;uec8e eajbaz9/ j9ing on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to kee:voi9yc+ /fuo5qgs)eia6 ezg k;9( -ff kq av+p pushing it w;+ oi:5u+vffkf qa/(eyka6vo-c g99g z)qis e ith constant velocity, because

  A horizontal force accelerates a box from rest across a ho4e*yp xg-f+vhrizontal 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 boxyv - gfp*4+xeh's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thujsgq+;7oc4g i7* x qg )nkmvl7m mh**fs we can dedu ) 4csjm;+ho7g7gmq*lkmgqnxi*v 7 f*ce that

  A block of mass M slides dows/o ;cyos06j/7sg m 0qzar gm6n a frictionless plane inclined at an angle q with the horizontal.6czs0j6oq7;g/ m rsam0sy o/g The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane in )nz;h1,ijxsa clined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is directjha)z1ns ,ix;ed

  A block of mass M slides down a frictionless phk3 n x7,-elaiq2 tb/j7we*qblane inclined at an angle q with the horizontal wetnq i qxej*,bh2-7l /k37ab. The gravitational force is directed

  Two toy cars (16 kg and 2.0 k5l mjl u h//0jjfhx+e1g) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statjl l0jfh1hx/mj+ e/u 5ement which best describes their acceleration after being released.

  An object sits on a frictionless sur;kv5 hqlhzmpp)v8i o6p ;wc7/ face. A 16-N force is applied to the object, and ;vkoip;ppm7q /whh5v6lz 8) cit accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 157nuwq01 i 4f emeu 1tm:3 r1dx7v5mu2jhpa oq000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on 3r0oqwfu1 15qetmmxd4v 7nupej5uh 1 2a i:m7the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m//9+ ane 7guird(rxfhz)eb:b (qv.t2 ts in 2.0 s. What is the net force acvt i9zfeq g(b27. eb/t rxra()nu h+d:ting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a spe2sqy s- 2gvjv/ed of 50.0 m/s after travv2j 2y- s/svqgeling
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 wgvf2. gh; 3yysame force that you push a 10-kg mass from rest, ;wyv2g 3gy.fh

  What is the mass of a person who weighs 11+dv+x7lzio3p zy a62n + kjs6e0 lb?

  What is the mass of an object that weighs 250 N on the surface dt ky6 8p)lbl)ax- ar4of the Earth where alk6l4yx a)rtdp-b) 8 the acceleration 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 oi+ buz0 ,m0k-s.ogvsrh5zna : bject on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the uanhs k0z0g -m+ .5iz:,sobvrEarth?

  Object A weighs 40 N on Earth, and object Bt4xijrz ;5a mfd2p4q fzv 6/bk2)go u6 weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Como6z4 k6dgat;pq vifx2f/ jm24b) 5 urzpare the masses of the objects.

  Sue and Sean are having a tug-pfq8ub5. c m o,nl0/2ktv s9jxof-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 accele9nk pxo,0 bq/25vms jut8f lc.rates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a leru : 5h0hrwjm/vel frictionless surface. A force F acts on the stack, and it acch: /mh5uwr rj0elerates 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 t0;o/k8kmaa ht will the scale be re m08;ahokatk/ ading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale ridesk5nztn g7c.i+kp /mn: in an elevator. If the mass of the person is 60.0 kg and the elevator acceleratepcm/.kn7:zig tnn k+5s 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 elevatk-10z,swj. uyu lzn9zor. If the mass of the person is 60.0 kg and the elevat-kuzw1j9z ,l sn 0yzu.or 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 8.0 ;3zsbmqcmmqhx u0( 8 u,k -y4gN and is directed dus( xb4;mqg3-kym,hucz8 0uq me 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 the flatbed of a truck. tly nmlft jw 3-+;jd+;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 +;;l fjttm3j- dwly+ndistance if the load is not to slide forward into the cab?

  An object of mass 6000 6 hko/zp hi,s9kg 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 ik/ps 9,o6hz hload is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M / jdxor*i.m/q= 0.60 kg and m = 0.40 kg, what is the magnitude of the accelera*mir. jd /xq/otion of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40h 8m.s r(*hf.bbghpjbmce8m 05 flv+: kg, what is the tension in the string? (Ignore frihbc8p8s bflhm5.hj0( m v*r :bge+.fmction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal f8kn2n/ u)eqrploor with a force of 100 N in a direct )pre8nkn 2/quion 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 force ofd5umh 2c :(n:wj 2p4js90 rgnuhc r6sy 100 N in a direction of 37.0e above the horizontal. If the mass of the b90sn2 2jscj c:py(umrwr6g5 h 4h:nduox 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 tw11 ta c)+fftylo ropes as shown in Fig. 4-2. What are theaf 1cltyf1t+) tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the igkg /pn )(bsw7veg,*mass of the trafficbe7p,(n w*igg vgks/) light?

  Two boxes of masses m and 2m are in contact with each other on a frictionlessq7+2wfq n6jg x)v pir2 surface. (See Fig. 4-3.) What is the acceleration of the more massiveqrvxg)wi26 2nf j +p7q box?

  Two boxes of masses m and 2m are in contact with each other on a fricti5yejba--q/c i) 6jbzeonless surface. (See Fiz-qi6bb - eje)aj /5cyg. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are capxq b195z8ne onnected by a rope. (See Fig. 4-4.) If the forq51pb 89a xnezward force 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 rop5+ ca1qbs4 7rliefaer( vz9 .n qzy(b:e. (See Fig. 4-4.) If the forward force on the za4c9nl(ab rbiez+15.es y 7 fv:(qqrmore 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 shown inr4t2s3(ya4s w oq (j mqb8)afu3frbm* Fig. 4-5. Box I of m4qmys saa4 rq fm b8(j33bruo*w2f( t)ass
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 stad:qxm::l hg* 6gbk2u otic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. mk*gd :q6b2x:ou gh: l 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 frictions for plastic on wolezh+)0od *trod are 0.50 and +0 ozt*l red)h0.40,
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 qufu;u*+ 9l mc+x direction. It slows and comes to a stop+9ucmlq u f*;u 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 horizon. eb; z,7-t7cheg .ik ens3k1n*ev ghftal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion.b.cei*g .-n kke1gs z3 v7h,e7f;eth n What is the acceleration of the object?

  A horizontal force of 5.0 N acceleratehlwlk4hw/6 5ns a 4.0-kg mass, 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 given an zbes5b98.vh anx ov ;g6.:njx initial speed of 10 m/s. It slides 50 m on the ice .x;g8.z j en vonx 569:havbbsbefore it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigatio h,+ka)kq+ ss, d;oqgi9qu5lfn of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of fric lish5,;g+ +kf)kqq9,qu doastion 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. c,s mg2yj i1wbq)um31 (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 liyg,)jc u2q3bm1w s m1ess 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 s52;zq qa/kp pp- z;qvrfukz3k -84gde tacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth aaz43/puk-e kqf qpdq k rz;gz;5pv2 8-nd 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 inclined plane. The plane *ld4f3ygxxm1 lt.dl x /75jgnis inclined at an angle jm gd* .4 nl5gx3t 7ly1ld/xxfof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a fl3ex zh p*ng/3 +u+b7tyqr,mjeat hill 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 smoot(dc k- 7r2oe:hmxwri6 h 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 smoot zoz;8hb aq3+yudo c oq:kc)-;h 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 iyu0hsw/+ 1xs4jcne 6nnclined plane, at a constant velocity of 6.0 m/scjx/ysh14nw +n6 ues0.
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 slide d)fp48- kb/z0vx tflss 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 rough 9hh8 +l6jqmu .xuqt njn (r4-kxpy3z) $37^{\circ}$ 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 surface. The jtii,fez3 +rm p97x9d9 z f26zjgh;qdcable attached to the log makexftz9+mh3dfgd,ri9 z ji ;9ezjp76 q 2s 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 yw7(m3xrx*s k9+ojfe rest on a rough inclined plane tilted at an angle o 9x7so*y(+jfwemxk3 rf $33.5^{\circ}$ 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 gradually indogo*do 14o3eh(luz 2x/ h:wzcreased until the object begins to slide. The angle at which this occurs is q. What is the coeffdou2/ (*o e143dozg: z lxohhwicient of static friction between the object and the plane?