Which of Newton's laws best explaia0nggi, fhv*47le9 x bns why motorists should buckle-up?

  When you sit on a chair, )ms (dw lb(a3x3kdh5q8skx, z1m hqh7the resultant force on you is

  In the absence of an externab)(em,fzxv - ms;eff ,l force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are6c9,c 5qkhbgq/g q xe3 suddenly turned off, wk5g,qghc3 q9cq/xb e 6hile traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. It ild921 d m1zwnp(c qkub08+ir(tre dg)s far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in o k1+ pwud)(ndz tcdb0rermlgi9q(281rder to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall forward*b:iw*vlmw ( uo5sx-m . You can imply from thb(m:5xs lm*wu -v owi*is that the bus's

  You are standing in a moving bus, facing forward, ang,or)s 1 .quqccik:. vd you suddenly fall forward as the bus comes to an immediate stop. W..cg i o )s,cq:kurv1qhat force caused you to fall forward?

  A constant net force acts on an object. De vuo3xud(3gucc3;sf4 scribe the motion of the object.

  The acceleration of an object v4 h8/*kqgc2l(ztajsem a m3qh/y1 s0is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. n8z6a n ::b 4aacvh)nvl8w ;pe If the same net forcb)cn:na 886e4lz nwv;ahpa:v e is applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m rctinea 1+m48bib )d:and produces an acceleration a. What acceleration resub4rd 8mai)tb:i+nc1elts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then rel/bhw+d sj+.) 9dand. ucfj ;- zn4jsvcease it, the balloon will fly away. This is .dj)dsv ++bjcdu.w4nf/h;9nza c-js an illustration of

  Two cars collide head-on. At every moment during the collis7 -8x pk 5xb:tbjh(o-mci tv6dion, the magnitude of the force the first car exerts on the second is khm:c(86 x jib-7 -o bxvt5dptexactly 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 onbxlxdm1 ehd* t5jj-, wlz:0k1 an object, the force which the object exerts on you wixkxl,h11d jwbet-z5j 0:*lm dll

  Action-reaction forcesa+j78v(p rv rk

  Action-reaction forces 0s6potam /h+rfqrc1sxs 5 /z 3are

  A 20-ton truck collides with a 150) e/80tp;u 2qt v1sljf7ylbay 0-lb car and causes a lot of damage to the car. Siyp q;l1l7j2/uy 8 est)bftva 0nce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earthjxvo2/op: 4h j pulls on this object with force mg, 4pho:j/vx jo2which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a str7zxr.e t zq *hpyf 9j5eqv-e05v)+kl bing. The Earth pulls downward on the toy with its weight force of ljfex ezve90 b t kq5*+ y7ph5)-z.vrq8.0 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 a i7qobi-dzt5-tdc*5 fl)kfoyl1phv;4a h 73force. The ball hits the bat with an instantaneous force, whose magnitude il17a t ;cp5*3hkhbv o-dq4l5zyidfoi7a -f) ts

State Newton's three l)(lniods/q f 5aws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon p.) up-ii9v(w3ulzr) dao fdx96 nm( xthan on Earth. Which of the following is diu )nmda .-(o(vpr9f6x9p 3xuizlw)true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which actu cpk9vc(84x oyg4) 8q jqas;t w4l+bts at a distance is

  Who has a greater weight to mass ratio, a person wei,jb1*f2e/eb :m yx*cpb;smk rghing 400 N or a person weighing 6s ;ym2/jk1 xpcrbb, e*e*:fmb 00 N?

  A stone is thrown straight up1)m 1 9jn*4q3:fnfnqnibcvwbu ;9c t 6zfxys,. At the top of its path, the net force acting on it isf,nn9 ) ic*q3x1f9:um bnwby; zc fjq1tn6v4s

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the k5siln 94x*x/soh8 z7bnfc8 jsame height. Ignore air resistance. Compare their acceleraci4sf9*5nxl 8jh zb 7kx/ns o8tions.

  A brick and a feather fall to the earth at th5t,7.g qx fxsgd0zel2eir respective terminal velocities. Which object experiences the gr2zx5de0g .sfgl7,q xt eater force of air friction?

  An object of mass m is hanging ,e6p yia* iqsiz4p0qq (u q(kp6wo4+ zby a string from the ceiling of an elevator. The elevator is moving up at constant speed. What qa zupp zi4s4*kioq q0w ,ey6p(iq6( +is the tension in the string?

  An object of mass m is hangie;u6/xekkn .04) aon)yja y mqng by a string from the ceiling of an elevator. The elevator is movinaq.eo4m n/x uy nayjk)k;e0)6g upward, but slowing down. What is the tension in the string?

  The force that keeps you from slidi: nfdlk6zbz1u7 -8wyt ng on an icy sidewalk is

  It's more difficult to start moving a heavy carton from re;tgch.u /9fvhun2mt1 st than it is to keep pushing it 2 1cg9utu /.fht;nm hvwith constant velocity, because

  A horizontal force accelerates a box from rest across a horizon-a(c- .w:gojz-c wu -ygh)ukt tal surface (friction is present) at a constant rac)gkwt-u-wy c-o g:z.aj(- hute. 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 vexil.:iltdlq h873 qp 21wtx4tlocity. Thus we can deduce t .l 1wqt:3qx48iphilxtt7d2l hat

  A block of mass M slides down a ib*w c:py,fc3yk v+: t(ok4eqy-wco5frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the bloq ,53+tpvck*ww: cy eo4- iyy(b kcf:ock is

  A block of mass M slides h;n0k+(h 0c1ue juplxm/em o *down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the bloc hep *kx nl/(jo0hm;1m+eu0uck is directed

  A block of mass M slides down a frictionless plane inc/fj ( pd,5ip2z1 ncmkilined at an angle q with the j(n1/d i5c2mikz ,fpphorizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simul;bw apfd3/o ukr n-t2cmy+ 33itaneously on an inclined plane thaoa3rf i3 wy2n+ 3tukc -pdmb/;t makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surfak b9gqt yx+h)fl,/5bfvp:y8 zce. A 16-N force is applied to the object, and it ac,y9f:5 y+hlkp8fbvtb xq )z/gcelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass uf2)zxxf9 xij,)p n3v1000 kg can accelerate from rest to 27 m/s in 7.0 s. What i)z 2xu9xxnp)ij ,fv3f s the average forward force on the car?

  Starting from rest, al op 7i47fk, xxv7kc:v 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net fo4vcvk7 xo l, 7:k7xpfirce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which an7mk suq).m, ,8p ixrwcquires a speed of 50.0 m/s after travelinxqkus, 8iwm7m.) rp, ng
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 i*5s s3 cl-8ic9z ir,3j gjaepa 10-kg mass from restaii rs5zl 3j93cj,p-g 8sec i*,

  What is the mass of a person who weighs 110 dqv:,h(zq*tq a3)dzvu4 mmi0sg m .w. lb?

  What is the mass of an object that weighs 25,rw0k wdpl9jn wjw3,+0 N on the surface of the Earth where th9+ ,dwk, wl3jj0nrw pwe acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earxh1jju 6 crjw4/ 9/cccp (6qkg8z2oqoth. 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 on thhgjqc6 co2p cjcu6z/wk1or(qj/498x e Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N onaiqu 5h0sth69kj9l ; o9n(xsm the Moon. The Moon's gravity i5n0tj(;9s m l9qh9xokhius6 a s one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg ropn-isnzwb8-f u2ly,:i fy .fi6e. Sue pulls with a 15-N force. What is Sean's force if 6b.s yuyi zni, li8-fnw2ff-: 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 :0fs sm,q7mvu on the stack, and it accele 0v, q7ummsf:srates 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. Whatzo0:,0bu/ nnxh6ydzl will the scale be readind0znln yho,0bz/x u6: g when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 kg v:7 ;r1ym mnarand the elevator accelerates downward with an accel nyram7v:rm;1eration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. Ifhs 9/lo +j*li1ru 0kzn the mass of the person is 60.0 kg and the elevator accelerates upward with an accelera nos+k/lj1z l0 9*huirtion 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 N fe7v3bbkgyto g 55hl; ;; 4jefand is directb7 5 ;3;olff ;vj5ey gkhgbte4ed 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 on the flatbed of a tru/;j l-ccp 0r6,ojqvv rck. 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 forr/ pj0lqj, cov v;6c-rward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truckhw 4n.1k( cqct7)xjwe . 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, whqtck 7wj) x(.4ce1hnwat is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, nnt* 03jypx;w0j o(ju if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pullt wjp0xn3nu;oj 0*y j(ey.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.iefe19n,4rs,e9uf x r 40 kg, what is the tension in the string? (Igenu,f rs9r,ix41 eef9 nore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal flooak bdun5-:(zs*7 f ffur with a force of 100 N in a diu-nafd7:k5bf z s (uf*rection 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 floo-q*bh*x+si 7suv 2z39jrx vb tr 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 fvhsi+u r27tx9vjq*b xzb3-s*orce on the box?

  A traffic light of weight 100 N is supported by two ropes af gieo kqi a700i;:slmdj2 gofb55.n3s shown in Fig. 4-2. What are the tensions in the ropa 7o:i3fl5 0 25n;jie gi 0ogq.kdmbsfes?

  In Fig. 4-2, if the tensions in the ropeot tmfgl1u.+yb5 (ixi: m(rn *s are 50 N, what is the mass of the traffic light .tgm1 ni:if xr(yobt +um*5(l?

  Two boxes of masses m and 2m are in contact with each zn was(8jn ac6 85f;fxother on a frictionless surface. (See Fig. 4-3.) What is the a5acfzj(8xa 8wn;n6s f cceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other o(j 3teb7w+wc4k54rc b6days dn a frictionless surface. (See Fig. 4-3.) What is t35bws+j dw( 7 db46cctey4krahe net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope.c 7gk m(v+ycp0k1xe t: (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connectkx vgk0cc1 my:et+ 7p(ing rope?

  Two boxes of masses m u; ebq*)ijq;d and 2m are connected by a rope. (See Fig. 4-4.) If the forward force b qq *i;;d)uejon the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord runnh cj3acu) 0appsz5o*.ing over a pulley as shown in Fig. 4-5. Box jc )h5ups 0ocp.az3 *aI of 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 betwvm)(+3(wz f7mmxh 8xe bli0kseen a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the netm(7xs (x0zlimef m8w3b v) +kh force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic o h49mq.h9bbg5pxof (td6a hk 8n wood are 0.50 and 0q9k4gf. oh (xhd 58 6bb9thpam.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 +x direction. It slows and c5bf65;m9.n n z otijfi,0on ctomes to a stop with a constant accelerati nif65cozn to5tj;.fib,n09mon 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 vzb5 9pg0hb0rc y+;or y*;ujna 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 y0 ;cypj;urn5* 90r bbo hvzg+object?

  A horizontal force of 5.0 N accelerates a 4.0-kg m vdahdq:*8)tjv q4t l+ass, 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 speu9xb,d x y0nh94r0o iped of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and t9xoiy nuxd9br 0 4ph0,he ice?

  During the investigation of a tra2us9d; vh7p ftffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing condi97 hvp2;dfutstions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fib;;z owt/ v8lx5exr9bcs p .9jg. 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 masrxb/zw t8bl5v.9cex ;p osj;9 sive box, what is the static friction force on the less massive box?

  Two boxes of masses m9f2 2wso 4bur 3n26mzejbeepbuk/k-- and 3m are stacked. (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 maoe9nkbu-ps 6j2 e-rku f23emz2b/4bw ssive box does not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frict pyxy;s;1yng(yg/zt gsbke ne9 4t6.,ionless inclined plane. The plane is inclined at an angle of ynypsy1y.bk;nt,z4t ge9; sx/(6ge g$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flcd7d,),utcemh5).h . s)k. ha fsxsc6 rqzuc/at 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 ahlg ot8:y:ky8w c0pf9 smooth 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 inclined plane tilted at an a8jxncwsw dg e+e afj635fz;3 x9m: ue3ngle 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 dlgu8acv.8ulm.cl*1v g. q n9 down an inclined plane, at a constant velocity of 6.0 lu9v c8n81lgv*.a .ud cgq l.mm/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 slides0v84ejsmwfst)1rhb58icc + o) x q;zo 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 roughen; a(p+zaugofn a+yo:, .ub, $37^{\circ}$ 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 50a h8wbo41m-e2.mdyik 0 N along a rough surface. The cable attached to the log m 21hmo -8w4kb.adimy eakes 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 ptv+0 -vq i,bkrough inclined plane tilted at an angle+b vp k,v0-iqt 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 is gradually i pfc0t 8ztnechy0*cf +; u9hd2ncreased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static fric 0;t0 8yepf9h*t2+cc nczuhf dtion between the object and the plane?