Which of Newton's laws best explains why mot m3;v( w-n0knzkjbw* vorists should buckle-up?

  When you sit on a chair, the resultant forcevd g/s;:nva -e- yv(ot on you is

  In the absence of an ext7 u9leye9 dmecj r.x;8ernal force, a moving object will

  When the rocket engines on the starship NO-PAI a;ornykhemdh()yc7w:px 4wn+ 8a z );N-NO-GAIN are suddenly turned off, while traveling in empty space, the starshipy e(whhac +7n y;pza8k); 4rw:o) xdmn will

  A rocket moves through empty space in a straight line with co;bbixoz (*l-n nstant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must(-bxbnz ;il *o be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly tmgbuq4 (q97 3ryxjd0fall forward. You can imply from this that th q0uxq4 9 3rbdjmy(tg7e bus's

  You are standing in a moviih lc rkabg / ro+m/tdc 06/i(dw5q:-rng bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you tm kcc/r5oi/d g/h dt+arqr l6:iw-0b(o fall forward?

  A constant net force acts * np6/oe1 pbj.aw4m5ggs+hn,n6e1r g bdt x5won an object. Describe the motion of the object.

  The acceleration of an object is inversely proportm zls3+.wblsx:ib+ uh 0-vwp ;ional to

  A net force F accelerates a mass m with an acceleration m-ap 3i nbrly5*7 e3eea. If the same net force is applied tlan 3* b7eepyemri5-3o mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces d* ,x2wxlgj8ian acceleration a. What acceleration rlijw xgxd,*28esults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then 5n 5+qg62 rsh 3 ztdgup .l4hnjd8rem3release it, the balloon will fly away. This is an ill3 nghzjp d5 .+g24q 6r3rmn8s5 tedhluustration of

  Two cars collide head-on. At every moment during the colliz2i: hrfo)xw ea*5c1zsion, 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 )z1zr aw5exco2i : *fhon the first. This is an example of

  If you exert a force F on an object, the lvz-;m/3e q3xso3 mey force which the object exerts on you will3lmx3z ; eoy-/vm q3se

  Action-reaction forcn1 5r2 81m66-fx /og+)mnhhbra7vxv bsyyzizes

  Action-reaction forces arecj.nj,f)0 r xnrt ad39

  A 20-ton truck collideq08u. a gw++z zltvta:s with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is donevlat:+uzw+. tg za8q 0 on the car

  An object of mass m sits on a flat table. The Earthy0 3m d-w ow857sbmiml pulls on this object with force mg, which we will call the action force. What is m8myi7swdw0 5-lom3b the reaction force?

  A child's toy is suspended from the ceiling by mean fwl esmxy7-9msj 0 uqqe2;vk4gz*d+5s 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 fos9yx qmeqm05z;-4s7+ *uf2gvw ek ljdrce"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous forceq a -b h,pon2/6bxxv3w. +bzllx*3qj e. The ball hits the bax6lba/n23 p-xbj 3ob+e*. ql hwv,zxqt with an instantaneous force, whose magnitude is

State Newton's threegsqa2 5nn i5i0f ia)m+ laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Whichkig3 yr tp)rbeqwn*ic / 7x0:zo.1. xu of the following is true about the mass and weight of an asto30:c*k) g r/xwti7 x zp .rq1.ueynbironaut on the Moon's surface, compared to Earth?

  An example of a forcew.kru q:(i un ox+.(su which acts at a distance is

  Who has a greater weight to mass ratio, a person wqfchbf )bn+u 4 e *0,+dfp8vpneighing 400 N or a person weighing f+ n* p0b)dcu,+nq48bphffve 600 N?

  A stone is thrown straight up. At the top of its path, the ;ffuquk;hn,6 net force acting on it iknu;;u ,q6ff hs

  A 20-N weight and a 5.0-*.g)pt4 b-wocft9dm,(h ks xp N weight are dropped simultaneously from the same height. Ignore air resotxbk( .t,p9f4p*- shc gmw)d istance. Compare their accelerations.

  A brick and a feather fall to the ear/zr8ft 4xylxh/b 6,uxth at their respective terminal velocities. Wrt,x y8bzf/6lu/4xh x hich object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an el+j9*eu.k.d gkq b4h-fi6,xb) g mkx beqe;lf2 evator. The elevator is moving up at constant speed. What is the te 2 f. j uk beb-+d*g;f4 ,.9bqh6qexigek)kmxlnsion in the string?

  An object of mass m is hanging by a string ;syn4 hz):ebz from the ceiling of an elevator. The elevator is moving upward, but slowing down. Wha:; bzyh4zen )st is the tension in the string?

  The force that keeps you from sliding roe6a m+3l8tgon an icy sidewalk is

  It's more difficult to sta,au.:6 h ybd;v/.lam6ikam e i: ax7mlrt moving a heavy carton from rest than it is to keep pushing it with constant velocity, becaushia;6dm7ay eml,ab vm.xa/6i l. u:k:e

  A horizontal force accelerates a box from rest across a horizontexamt+pbg u 6m1v2 1 k,a2,nnhal surface (friction is present) at a constant rate. ,tek62uhgapv 2m a1nbn1m, +x 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 acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thu ):a0u+h vnjnhupu*z1s we can dedu0z +*an:jvu1n)uh u hpce that

  A block of mass M slid0u 2e ms)q5k-c yc*azzh7pfq)es down a frictionless plane inclined at an angle q with the horizonta 2 m*5f y)hqc)cpz7eusz-0kqal. The normal reaction force exerted by the plane on the block is

  A block of mass M slide+xre ,qczn2 a:s down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exe qxa ,e:nz+c2rrted by the plane on the block is directed

  A block of mass M slides down a frg) d5 a 04w0jbyad:xl;ipea:cictionless plane inclined at an angle q with the horizontal. The gravitawcaid g)4:: 0 ;ypjx50bea ldational force is directed

  Two toy cars (16 kg and 22x 4g1n,8he w dygk0ph.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after bgn4y0hkg 8dx w12he, peing released.

  An object sits on a frictionless surzcxxhp g l0m m1:11b- p7gk1uvface. A 16-N force is applied to the object, and it acceler1:lmm7pvg-g 0 pxc 1bhu11kzxates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest .d.nr 1;;m .hzqug3 h0 goptvpac.pq)to 27 m/s in 7.0 s. What is the average forward force on t.cdp3;nhqgz) othq1.a ;0p.pg v rm.uhe car?

  Starting from rest, a 4.06 4yqs70 / dipebxrcvk37+tjpkev 9og7 a8+tb-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the n+o 3ke 6v+jd7xgkr7ip 4c0st78 b9eypvt b/qaet force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquir kmkxva.3y-maqvn(ph/q+ 6 b1es a speed of 50.0 m/s afte .ak b6+hmakvypn 3qm q(1vx-/r 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 you,d l,4u i.zel. i g-s8/kdxz;ewxdps6 push a 10-kg mass from re d-d. .ws6xee4zp ildi,,uls 8 g;k/zxst,

  What is the mass of a person who weighs lp usx)e ;736bs 5jh 3:qbepex110 lb?

  What is the mass of an object that weighs 250 N on qqs8a, : )zsazthe surface of the Earth where thaazsq :) z,sq8e 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 objefnk3.y9rw+r 0 v nko4xu:ne(w ct on the surface of the Moon where the acceleration uw ovr(rknn 3w+n:k0 9f4yx. edue to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object msub9. w lj / h*+e9ban0s;htvde9 1fqB weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objvtbabhed. m+*l9u 1; fhqj s0s/9nw9eects.

  Sue and Sean are having a tug-of-war by pulling on,lv 7m./d17m0c9hl wqx*bb e+qck; ai vy (upr opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Seanp*1 wl(0l; bmq.u,e r/7yc7ic vmh+k9vda xbq's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts on uypc+ x+u5wb 4the s++cu u p5ywbx4tack, and 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 st ;/vk. lza.q59vdkatjands on a scale in an elevator. What will the scale be reading when the elevator is accelerating downwakadt/a q95zkv. j ;.lvrd at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If th)5t47t*s jkafw-m cbv e mass of the person is 60.0 kg and the elevator accelerates down5vwa jm*c-tf7ts b)k4ward 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 the person is 60.0 k2f 4+j. szzwklt e9kw+g andk+t9.fwezw sz 4k+jl2 the elevator 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, /0i ww3t0vbxrl1 mv,ilhwa8 8.0 N and is directed due north. The second force toward tha xhw30lwiwlv0mvbti ,/8r1, e east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 k6;ji-sk7m ywb xsbd+5g 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 distance if the load is not to slide forward i5-i+s7ym bd kb6 j;sxwnto the cab?

  An object of mass 6000 kg rests on the flatbed of a tlog (djpkh9x-7 tl(i8ruck. It is held in place by metal7 l( kh(p8gx-dj9io lt 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 cab?

  In the Atwood machinek0lpzbdl m).:5oxpk/ shown 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 l5 md)ol.z/0 pkx:kpband the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, ww5ji)0dp 3axa hat is the ten0aw3d x5ij) apsion in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force ofpo8 juxbpk0wp 0kag9081* yeu 100 N 0baj 10xp0p*y8kuw ou 8 9ekpgin 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 horizontal floor withse9do sob1m jdt:k.,) a force of 100 N in a direction of 37.0e above the d,:o o 1m 9sjtdb)ks.ehorizontal. 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.h c;cjw m8r p/ohd/8e two ropes as shown in Fig. 4-2. What are the tensiowpemch/;jo/.8h dr 8 cns in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the maa7e(: a159n r( iwmts oqu,upy+v. ttiss of the traffic light?(u,soi1a7t5 vr(tqwy atinp 9 u.e:m+

  Two boxes of masses m anm4m *1r8k3evc2gu6hlozn / and 2m are in contact with each other on a frictionless surface. (See Fi lmcavnhm126 ue* g3zno rk84/g. 4-3.) 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(m- jz(dz)t xmvvklypo+q9t 1uz :9z+ surface. (See Fig. 4-3.) What is the net force on the more massive (m -d9x j+qvzmv 9o:1+puklzzyz(tt ) box?

  Two boxes of masses m and 2m are c -i49rrtsud9lonnected by a rope. (See Fig. 4-4.) If the forwirl-sdtu9r94 ard 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 ropaw); 2n v; prb4jxweak8m .4*crs oj;ge. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration oemj r c.j2gbpa; aoxw ;*)r4s v4w;kn8f the less massive box?

Two boxes are connected by a cord running over a pulz, 1j ds xyqm7bwa1m95 hjkw0c*v ul)2ley as shown in Fig. 4-5. Box I ofjd b70j5,wm h lzcka9v12 mu*qswx1y ) 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 3.0-kg box and a des/ 0fsx*wv btn8a 8.nx,;dazryk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to t0f aytz;*dwr,/vs8.bxa8 xnn he box?

  The coefficients of static a+ 4msh 28, qnhnso,nkynd kinetic frictions for plastic on wood are 0.50 and 0. hkhno n,n24 msq8s+,y40,
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 directi uf 3i,6d/j ju pd0ve0aqv(+ps34ot4 hxd/jy qon. It slows and comes to a stop wit4v3fsejqpd+pjod di v0ha/ 6( 3y quu/4t0xj,h 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 horizonqcvfk)z- p; f0fc)os3xqj ;(q tal surface is pulled by a 5.0-N force. A 3.0-N friction fok(c ) 0 vj3;-qof;xfs qzq)pfcrce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N acofa*pq, t0)r ut:eor :celerates 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 initial speed of 10 m/s.yto0c:(5sbj; do.nr u It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction betwd5 bo.t n:(j; urocys0een the puck and the ice?

  During the investigatiod7 ncwe58(h2idn i/vkff (tu;n of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and thn2df85tnw(7du/ (v;c ehfiike 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.) The s1 u8y o9xbgqw- vub r*:9f:8fy/not xkurface 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,f: u *wnytkouy/ g9 1v8rx-bbo8qfx:9 what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface beo c(tr0 (s-jdxtween the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less mass-cr(o (jxtd0 sive 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. Thzpw+;h jx p:;db(u ig/e plane is inclined at an anglpx;du;/hpb:wjg+z(i e of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill tr 5a)eamv8 uve ,a5wv4hat 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 plbojgxi2 9z6h.es ed (-ane 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 inclined plane tilted at an hz:/jv0px+f.c li(yh 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 dire8k4;djoqt0vt ctly down an inclined plane, at a constant velocity of 6kj o0tq;48 tvd.0 m/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 ro9 2l2 tzelvc, jky6iq)/w-msn ugh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slb-bkl6k x7t0tides 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 weighing 500 N alontmsvsp4d,gw( i1 z24q 5gcwh50oll bw+ +2yxlg a rough surface. The cable attached to the log m+(4 15 m54wg pb2dvy i+s2llwhg0lq xstzowc, akes 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 jb,t3nqm3 - teinclined plane tilted at an angle -b3,te3jq tm nof $33.5^{\circ}$ 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 an) z- fwxm2dc/ogle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the ox- cwmofd)z /2bject and the plane?