Which of Newton's laws best explains why motorists should bucklerrj(+d3 37k2u yh 2j;y+ t: kgvmr5pglnt:zcl-up?

  When you sit on a chair, the reke9mu.aroyx:5a ) fk3sultant force on you is

  In the absence of an external forgqui 2fexi8 qgp6fd+ q7(v24v ce, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN areymp3til 5 uqnk;, 0wl6 suddenly turned off, while trw,0; 6p m3lyuknqi t5laveling in empty space, the starship will

  A rocket moves through empty space in a strcg1 -jv:4zfnhaight 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 itn- :fz vgcjh41s motion is

  You are standing in a moving bus, facing forwarapeh0.e:: nj: oq kgz:z2nmj3d, and you suddenly fall forward. You can imply from this that the bus's:ga0z jn qh:2eo.mjp::z k en3

  You are standing in a moving bus, facing forward, and you suddsy l5nk/ 6s if1emj ,5uexu1j6enly fall forward as the bus comes to an ukuemx/65jns 1el1,jy 5 6fs iimmediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of d.z+jjon 0jt /the object.

  The acceleration of an object is invw 6/e+d kw 7k7ldw+anlersely proportional to

  A net force F acceleratesyts 0+:lvq4j/ , ehjmj a mass m with an acceleration a. If the same net force is applied to mjlv4jjqe y t +/smh:,0ass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acce 52hnt3kozz3nr 4vou8,p 0wsulerationn38zvhs zu 0 uoot3 ,4k2w5rpn results if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloont2 b6 (hi4deifpcor1: will fly away. This is aphi42i br:1t6f (ecodn illustration of

  Two cars collide head-on. At every m*) cnbu 5tapyuj9yswj (4ylww( x2m f2vd6i*4oment during the collision, the magnitude of the force the first car exerts on the second is exactly equaa w f4lu cd((v9tb2psyywj4 *xyj)u 6* 5mniw2l 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 object exe3tc* l.xn qh3zlv 6fj;rts on you wilcjl33*ft.6nvxhzq ; ll

  Action-reaction forces1j:dppguh62 85k 7gnjbx5x ud

  Action-reaction forces aby5a 6koq*ake)o4 v9b re

  A 20-ton truck collides with a 1500-lb car1zx;l:-f isq +xj zh)8xdfb(gqf/g2d and causes a lot of damage to the car. Since a lot of damage is x:z 2 x1qifj -d/)(d8;fbxz fh+lgqgsdone on the car

  An object of mass m sits on a flat table. The Earth pi 3i37b*chjku jfh kl.; 0(gnpulls on this object with force mg, which we will call the action force. What is the reaction force7gkl *upb3j(i .jn; ikchh30f ?

  A child's toy is suspended from the ceiling by means of a string.c lwkqed, ez, 60z,cfm)he. f0 The Earth pulls downward on the toy with its weight forc w,, fek0zem qh6.c,0elfzc)de of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. Th2i d2 t(mo1ukke ball hits the bat with an instantane(otiu 2m2 k1kdous force, whose magnitude is

State Newton's three lawsp 1pi-c)(8 wtmfvl *ws.

  Mass and weight

  The acceleration due to gravity is lower on0rx ; dyhc3zy0m5 (bm obgsw;+ the Moon than on Earth. Which of the folxb;3;b0h gm5yr0scwy o m+z(d lowing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force wh9p wj .:d)povqich acts at a distance is

  Who has a greater weight to mass ci0v. kudjt vpj;x7cw 01 zh2*ratio, a person weighing 400 N or a person weighing ;jxckzi0hctd7 v*vpu 1 w j20.600 N?

  A stone is thrown straight up. At the top of its path, the net force acting onek3bu*k 9;7tvzf, tb w-zw3ry it i* zyb9,wwf3e-r;ttkb vu3 zk7s

  A 20-N weight and a 5.0-N weight af/2eg;(v lgojc;c d7jq65hp9 l v0snkg /;fwrre dropped simultaneously from the same height. Ignore air resistance. Compare their accelerations/;f js7 chgkgjq fd/c;wv 92e opvlgr(;6n05 l.

  A brick and a feather fall to the earth at their respective terminal v liu dn81dxz-8( ah 45cobvgz*elocities. Which objeoba54 -ldvdn8g z( c1*zhu 8xict experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator.nu5b*ws,6dj,z( dfxe The elevator is moving up at constant speed. What is the s,*nz ud6bf,5je(wdx tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator.1g lprvi8,3+ dmj0qaz The elevator ispi1lqmvz , 8gar0d+j3 moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidew;.7neq. h+dm/0g amo9bq be7jn y bu+lalk is

  It's more difficult to std k:yupb4ah9z ez238v art moving a heavy carton from rest than it is to keep pushing it with constant velocity, becaushb89ud4: vepzz32 akye

  A horizontal force acc9ahp8op8 7*:6 qfivnze hc1lpelerates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditio8hq pz9i 1 7vac8*el :npopf6hns 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 con4g sqw, te twajx,)q+/stant velocity. Thus we can deduce that t) x 4aq+/t,sw,weqjg

  A block of mass M slides down a frictionlessdqhg59ba snu9o y3;: x plane inclined at an angle q with the horizontal. The normal rea9bq;ysoguh:53dn x9a ction force exerted by the plane on the block is

  A block of mass M slides down a friction74nk admt t73myytn r6 ukb2+ti 6l(0lless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on thekynyir6mtk4t0n7d t3u+ab(6l 7mt l 2 block is directed

  A block of mass M slides duuz(mt)rf 9+sbp d+b k0 f j,u(ap;5mbown a frictionless plane inclined at an angle q with the horizontal. The gravitzbf+5bdjf (u+r ,k (tp;map uu)bsm90ational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously o0 5gumys+b .iaq-hxqc)6c- h gn an inclined plane that makes an angle of 30e with the horizontal. Make a statement which c- +- 6 )g.gq0ms5 ucxhqihbyabest describes their acceleration after being released.

  An object sits on a frictionless surface.y,ch.zz+ ,tf-5; 4lgd(ls mf dsthf2k A 16-N force is applied to the object, and it accelerates .yf gf+zk,stdz4h(5,-;2cds lthlfm at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg cgil2lqcrc t yen cfs7z(u-6gm j ;4 w43h/,eu0an accelerate from rest to 27 m/s in 7.0 s. What is the average forward4zywr6c,mh- 0gcc (eiju37n e4tllf2g/ us;q force on the car?

  Starting from rest, a 4.0-kg bybs4phs 4h,p ;eh6ms (0 *ogdwody reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on ty od(sw,e m g;0hp4shh p6s*4bhe body?

  An antitank weapon fires a 3.00-k 8ihy f6ykz) bs)ilo :ji6oz1,g rocket which acquires a speed of 50.0 m/s after traveli1oyo6 fyjz8h: bi,zs )kl)ii 6ng
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 10-kg mass from re)6m 5hpk)ugafst,a56uf m)pgk)h

  What is the mass of a person wz c/n):xv rxd/ho weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface ()ma/hz*wlf g,j zd 8(biut6t of the Earth where the acceleration due to gravity iz8ah d)il*((btwg zj 6fmut /,s $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the ma k5a 9c;yprt4sss of the object on the surface of the Moon where the acceleration due to p4katc9 r5y ;sgravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the ,qhkiwu q9k5*ju9(e w +fzv /dMoon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objectsq ju,d*hwvfi w/k (u9zq5e+ 9k.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg rti9pw ti: ci- lq9p3)zope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue at9 -39qwlcipi)itpz: t $2.0 \; m/s^2$?

  A stack of books rests oif,gfivm ans+c3; p3r;1u)um n a level frictionless surface. A force F acts on the stack, and it accelerates acnf, )mms1fuup3 i ga3+;v; rit $3.0 \; m/s^2$. 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 scalrc, q7,e7fjh me in an elevator. What will the scale be reading when the elevator is accelerating downward at ,f e, cmhq7rj7$4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of th2b8r bp;dh ubfbnuo+ z dl5.0:e person is 60.0 kg and the elevator accelerates downward wit :r2bbu5h+dpb d.0ofl nu8zb;h 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 :s 3r41 faefzais 60.0 kg and the elevator accelerates upward with an accele fe43azasf: 1rration 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 hau8pu9g+nf c4c6*nrqd5 m0 bi( px7 tefs a magnitude of 8.0 N and is directed due north. The second force toward the east has a maguq+pn te79c 86(fxb p4unmfg* 0 rdi5cnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a trpwo1 d2))x atauck. It is held in place by metal brackets that can exert a maximum horizontal fort o)x2d )ap1wace 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 into the cab?

  An object of mass 6000 kg rests on the fl::7mckp/5khq; xpkj matbed 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 xm:k5k mh;c:pqk/7 pjforward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what iqt u69zet1.in 3*mrh hb/gn6l s the magnitude of the acceleration of the system? (Ignore frict bgn6nt/h r.zem t3ihq*1ul69ion and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, l:5ns/np6 b dxif M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pub x6/ d5snpnl:lley.)

  A student pulls a box tp w,2*f sihiyfk(f *3 xiyq4-of books on a smooth horizontal floor with a force of 100 N in a3k2(p ifih4y, * fiw*syft-qx 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 horo1jh2hx wa/jg4zkr, 0 izontal floor with a force 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 the box?xrjh h40jwg,/1akz o2

  A traffic light of weight 100 N is sujkwnblp-u*b4mk:+8 cgx kp. :pported by two ropes as shown in Fig. 4-2. What are the tensions inmj4xpu*8 -bk.:: bc+lgkkpw n the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass iqo+dqnct4a gy,c:ce1 *2ie)mi 2 )m+;ktb wkof the traffic ligh mc 1qi)kdknb)c :iet*e 4qyw ctami,+go2+;2t?

  Two boxes of masses m and 2m a ux kxbss: p.:lhz6;fry -0+pvre in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more masx;zsphrlvbk x6pfu-0.s : y+: sive box?

  Two boxes of masses m and 2m are in contact with each other obqo*t/nk)1 uin a frictionless surface. (See Fig. 4-3.) What is the net fori bt*1)uk/n qoce on the more massive box?

  Two boxes of masses m an+ : 4ggy7e3 k:nbuuggpd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what ggpe b3uk:4n:+g g7uyis the tension in the connecting rope?

  Two boxes of masses m a. 17y 2ui4i0mo1edmyqjp5q t hnd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the l2 .uohy0qp i15qe tm17djyim4 ess massive box?

Two boxes are connected by a cord running over a pulley asz bns 4b:w)y;h shown in Fig. 4-5. Box I of ;z)n s4h b:wbymass
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 betwrg 9l- emuo;j j0o)o .88 b1q vps)/nuj1mmrepeen a 3.0-kg box and a desk are 0.40en8vrp 1esoj/qm98- ur)mj og0.1o;ub m )jlp 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 5t*o+jtpb(xzcx8jw 9frictions for plastic on wood are 0.50 and 0.40x tc9jzbx8j p+t5 w*o(,
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.4mpa/mls by62 It slows and comes to a stop with a consy4/ma l 2m6bsptant 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 a 5.yhrnh/q 5kxl 9vs7qpm6;u8; p0-N force. A 3.0-N friction force retards the m;p u6yqn/8 p7qh m 9;lkrxs5vhotion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.r.cb9,, +ah ai ttnln,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 sjs+ b 8vpbb9m 6xh5a)jpeed of 10 m/s. It slides 50 m on the ice before it stops. What is the c5ha9x8bv 6m) +pjjb bsoefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid ma1 ;l*mttyaf 5,pknr( s6:xkwwrks 90.0 m long. They determine the coefficient of friction pw 6fkt *yt;n: 1(,ls5rkwm axbetween 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 ubksvl ;* tr18 wkpam pl83r+1stacked. (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 force on the less massi8wkbp8 ; sa +rvprutl*m11k3lve box?

  Two boxes of masses m and 3m are stacke5tc5 nx,q8ylh .6yqednd d)g7d. (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 coefficient of static friction between the boxe.c l,d8yn 5q)q5ed6hnd yx7t gs?

  An object is on a frictionless in :ezo13j8oweix hrw-b79wzz 3 clined plane. The plane is inclined at an angle oiz1or38w9j3-xwwz bze:o h e7f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill thab,x4n( p,a)2 ybpxn 41ziswfot 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 ang7 cphq07nh v:,fthm2lle 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 nlu+/*4 ;wuoegxqx5jat 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 glt (o0ag lwz)oh zf+mc55. 1winclined plane, at a constant velocity of 6.0 5(h.)w flc15 oo+z0 azggtw lmm/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 rou/-me*np;jb3.d xcwj( qjp i ,jgh $37^{\circ}$ 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 3it2t ,)ndrc9joz5gq 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 along a rough surface. The cp:x5+az0lbav 3cj,weable attached to the log makep j5a:3,wavb 0cx l+zes 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 f,co 1cgxn ;l3* /xbjyyrom rest on a rough inclined plane tilted at an angle y1n3/gx*lo j y,ccb ;xof $33.5^{\circ}$ 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 i bigizz)75;d v7 u5nsxncline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coef7dxni;5 57u sz)givbzficient of static friction between the object and the plane?