Which of Newton's laws best explain(5loje8md 4cy s why motorists should buckle-up?

  When you sit on a chair, the re(zx+rb;b nhxc l 5//fdsultant force on you is

  In the absence of an external force, a movinajl 4uw1srky* ey; 2rf2 qrx/2g object will

  When the rocket engines on the starship NO-PAudjzv q9s6tfvc 4 s l;q(;e**jt* ez.mIN-NO-GAIN are suddenly turned off, while traveling v(fzz * 6e 4t*vlqtj;js;*mqeusdc .9 in empty space, the starship will

  A rocket moves through empty space in a straight line with const*/(cp qud sp1ba4u6qtant speed. It is far from the gravitationd/t 1*b6s( q quc4papual effect 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 moving buas3xar0hp -yb)w zqr3d cx 93q.l/jg4s, facing forward, and you suddenly fall forward. You can imply fromxjcws-a3)94/ a .3 0ylz3bdq xrpgqrh this that the bus's

  You are standing in a moving i-hs hk 0 ,-p ;z(f:qp99znentdwy .obbus, facing forward, and you suddenly fall forward as the bus comes to annod; fzwe kp-9,s9.i0-th( ynp: bq hz immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the obje z i8 cnlbkdgn d:w65k:7:j)axct.

  The acceleration of an object 3zdb3sf fn 4j4is inversely proportional to

  A net force F accelerates apkv.d bvp3i/.)e4j mz mass m with an acceleration a. If the same net force is applied to mass 2m, then the acceler k.jppvv3bzie) m /4.dation will be

  A net force F acts on a mass m and produces an acceleration 7dcfke5:gs: f a. What acceleration results if a net force 2F acts on mass 4m? f:fg5kedsc :7

  If you blow up a balloo5bo acl s2ys,,n, and then release it, the balloon will fly away. This is an illustration,l, oys 2casb5 of

  Two cars collide head-on. At every moment durin.xy d2q-g8qtt g the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car eq g8tq2y-.xt dxerts on the first. This is an example of

  If you exert a force F on an object, th-;v06qa.kv(x)pc 4nptn xlaae force which the object exerts on you wi6 nxnpk; vqxal.0 )-4 (atacpvll

  Action-reaction forcv t-g 2g2vbjv.es

  Action-reaction forces ;t -oand/wdy8are

  A 20-ton truck collides with l0blr -zik/5hve s p9/krdr+( a 1500-lb car and causes a lot of damage to the car. Since a lot of damad sez+lp(khk r59/r i/- blr0vge is done on the car

  An object of mass m sits on a flat table. The Earth pulls on .j*2re w1v4zr;d v3bf x tkps(xmqb+:this object with force mg, wh1bdwe3b+p fvr; x2:rmsvzk4.*(qj x tich we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling ovb,3 j7iord* 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 j vd7or*3i o,bthe "reaction force"?

  Your bat hits the ball pitched to you with 6cgz y/ /uxcb 5e/hm5wa 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whosebyghe6 5c/ cwmu/5xz/ magnitude is

State Newton's three mm 74 7dicpp,flaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than osxt u.tu7 47wbtk *hs2n Earth. Which of the following is tru wut u4sk7h.ts*27xbt e about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a forc+mj0(yhjt h c/8 nyp:5yblu:le which acts at a distance is

  Who has a greater weight to mass ratio, a person weighixjbfi9b q7dihcd o+ -t 5(.5swng 400 N or a person weighing 600 N?cwxio q7j+sfbb(ht5d9. -5 di

  A stone is thrown straight up. At the top of its path, the net force acting ofh ns q5 6z 3 c6v5g.vpgnkomwr/j(;m+n it isz3+km6v f/.gvh5 jn c orms pqn65w;(g

  A 20-N weight and a 5.0-w ebd0v:s ayvjl *9a75N weight are dropped simultaneously from the same height. Ignore air resistanc0as dew y l7vj5ba9*v:e. Compare their accelerations.

  A brick and a feather fall toj)7elm3:qzw*pmlh s - the earth at their respective terminal velocities. Whicsm pem-3z :wqjl*l)7h h object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceeowhd m:)s- p)iling of an elevator. The elevator is mov:)w dspmoe-h )ing up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from th6(lne*zb ehee nb :br/sgk k kw.3nv4 yx:*6,te ceiling of an elevator. The elevatovbye6e kk.z*6whtg ,n:nx/rbls ek*( e nb3: 4r is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sicb;e 5.b0 wgtidewalk is

  It's more difficult to start moving a heavy carton from e;;abjg4 *3lccath i7rest than it is to keep pushing it with constant l4c7t;acj*;i eb3hga velocity, because

  A horizontal force accelerates a box from rest across a horif4c w;gt4*0 w+dnzmhbzontal surface (friction is present) at a constant rate. The expeb wtfh+gz4 0dnm *c;4wriment 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. Thus we can.nc)x 3n0qa,rw 08up g9pdtzu deduce x8nuuwd9)z,3p.0 n p0qt a rcgthat

  A block of mass M slides down a frictionless plane ix 08g*nlqfmaj d.q(r-nclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the blo 8lq-(f0 qmrjxad ng.*ck is

  A block of mass M slides down a frirhk- 57zbegpqs7: ug 0ctionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the bloue-qgz:7br7kg5 s0 hpck is directed

  A block of mass M slides down a frictionless plane inclined at an angle q with td:iz lab oal d0zds)02f/ cd*)he ia la0 2d/) db)ddzs:zcf*lo0horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneouslydnhy:bcw17 ks fhcn+fu+9k)6 on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best descrifk 9+ds)cbh 1nc:why6 fk 7un+bes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to thmjusai7u /90 q m8e8tbe object, and it acceleratess/i88a uej7t 9m b0mqu at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can .q yru+3nnmc );hk+xeaccelerate from rest to 27 m/s in 7.0 s. What is the averanmxqcy;r e++u .3h)k nge forward force on the car?

  Starting from rest, a 4.0-kg body reaches7f16zeld3gmh: s6zb td3 fd e9 a speed of 8.0 m/s in 2.0 s. What is the net force acting on e6b d 9s3dftd76z1z lg ehm:3fthe body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m 8s s1)t ohrhf4zx8pv,/s after t pxs8h,z1hrf 4t8v os)raveling
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-kg7 ph.w2aq:aqeew tfbec31.r9l5*t n6 a lqnx) mass with the same force that you push a 10-kg mass from restete9x2.5pf* aqw a6q3) lbc lrh.e :nw a7qnt1,

  What is the mass of a person who weighs 110 l k 0.whvpevnk3p3x;d*dv:3zu b?

  What is the mass of an object that weighs 250 N on e6(pvq(2y/ymp)iddv ;*uw+ h4kvtq.vn*dugthe surface of the Earth where tyuu6/ hqigdyq.(4t w*+ep2 vvdmpkv n )(;v d*he 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 o e; z3sm(xf+n0:sc mznbject on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?n +:s;3s0 zn(ecmf mzx

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The x 7sj 3l9q 6g;bn0pfg nxbr-)bqef,/xMoon's gravity is one sixth of Earth'n 6bxl9-;x3bfpe/f xb0, ngjqsr 7 )gqs. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kgn4h 8ugq+c 00l0ia v2)ap ojjma kj7g6 rope. Sue pulls with a 15-N force.a2+ua0jglj 8m j4p 0ia)kh 76 ov0gqnc What is Sean'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 foy4,zr 4.3k vimg- 6d jsdb2agv(u blg/rce F acts on the stacklv abb(6,44gdrgs/zd.jg - 32 kvu imy, 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 stands on a scale in an elevator. Wh7 yn ts-12.k-a c hjswbx4x7uqat will the scale be reading when the elevasx-b4u 71nh-a.t q2sjxk7wyctor is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person jdx 5 /t8a8rkcis 60.0 kg and the elevator accelerates downward with an acceleration of c j8x k58a/dtr$4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If thezb9 0fwy,gnyj5suqli).-g:mj* tm8 m z3)n hd mass of the person is 60.0 kg and the elevator accelerates upward wgi.s9mby:z*ul jz)nmgj 5dt 8mqn-h0,3y)wf ith 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 nynb+96:d 0 6g(louq -m9astda8(fx.bvf bj e8.0 N and is directed due north. The second force toward 8nom.d9el 96 (6:ja0sda qxfybutgfb vn (+-bthe 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 trmu5fa -wg.u7,, gz1+j sheje +bm. nbpuck. 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 slbwsgmme+fu -+ ezhp,., 7n1a.5jju gbide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It i9 mo*p+hmpn0- h6fmwvc8 v: qgs held in place by metal brackets that can exert a maximum horizontal forc vpwp 9mm+-ofv h:*cgn8mh0 q6e 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 machine shown in Fig.)+ygn2iry:p ewj vp ; .5tvhw2 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the systeeir2 p2pw:v 5;.tgwyvhny )j+m? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m 8a xlyf*z:/jwp2)rfd= 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the p:/dap zy jxwfrlf*2)8ulley.)

  A student pulls a box of books on a smooth horizontal floor with a force o s2ie7h7kw qc tfsz*9j4b 9y)pf 100 N in a direction of bykej2qf)4h*9iwst7p 79szc $37^{\circ}$ 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 of8x/s) sqrhh18,j -ap(bifdg k 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books bq)s jkf/gah ,r8d -h1p8xis(is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 1w)z/ lbtzt -uo(;umyq4u t6k200 N is supported by two ropes as shown in Fig. 4-2. What are the te4t 6k2-m/b)qly;uuwtt z (uz onsions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 ;x la;a 7k 4prpuse97zN, what is the mass of the traffil4xua 7p;k 7;aespz9rc light?

  Two boxes of masses m and 2m are in contact with each other on in)g3k2udbu 9 a frictionless surface. (See Fig. 4-3.) What is the3ug2n dikb 9)u acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each oth l-lp*ct;/v 6 nrs/jhker on a frictionless surface/-6n;l k*rtclsv hj/p. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If th2h3dcg o,tig 0:/r3 qex oys/ye forward force on the more massive box is F, what is the tension in the connecting o30ch sye/:2qiot ygr/xdg 3 ,rope?

  Two boxes of masses m and 2m are connected by.k qcic*1jl3s,)0r.3wh7leap rxn k6z kl q1b a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of thzk an,pjq rhelc..1xl*07 l1r )iwkqk3b36c se less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 21o 7jz7qjv 5m jlfnh14-5. Box I 2nqf7v17ljz 1hjm5j oof 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 frictionsz3e+ 4doquf5yl0c , mi between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horiz3 il0uy oqm5c, +4edfzontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.59gj a+foo*asjc)c6z50 and 0.4fs 9goj )z acc*+j6a5o0,
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 to rbq6:1 io-k2lfhtupf t4 ,di h,tc,k7 a stop with a constant acceleratio,7 ofud tk ,pk1f2qhih:-b lit 4,6crtn 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 ask7;qrx6f:qg) z h w6s 5.0-N force. A 3.0-N friction force retards the motion. What is :;hqwx6gq6s z7r) fks the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass,-ifsi av/kap.p93,iz 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 lsj4wtj(b j( neb ;ky,- x(-qam)z:da is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between tmw -jj(tszxj;e, q) y abd:(kb( lan-4he puck and the ice?

  During the investigation of a traffic accident, pocqjk ur7a 68s jjh98-ylice 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 conditions. Estimate the speed of jjhq-r8cyj 79asku 86 the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betwr2foq99w1 dmk 9:x bjteen 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 stat21b:mq 99 kwfrx9ojt dic friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betweenn/ a,ka ;(m r(1mpxsqy 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 sta;/r, x1(aypkm sam nq(tic friction between the boxes?

  An object is on a frictionless incline;c(xpgwstg4/nb m* sg(7r* yh 7o(deyd plane. The plane is inclined at an angle of np*y4 ;x o7 twg/ge(*(gy 7dhsrbsm (c$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mak(p(7e hbmfg,xepe -5o,f 2iines 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 an)ytrvka bp( 75wyyg8 /gle 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 plancjd8+ysa,r 9v z 2x3nbe 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 inclined plany3v/;el v 8n2h8jxm e5m ggvgh,s6p +qe, at a constant velocity of 6.0 m/mvg2helpeyhv s 8/gng,j 3+6q8; v5mx 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 roug9qgkw, vxb:n2h $37^{\circ}$ 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 c:yyfv 4ipz 87rough $37^{\circ}$ 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 wei5ti5q. aa; t 4z2xttytghing 500 N along a rough surface. The cable attached to thait5ay4x;t.z5t 2tqt e 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 releas3* fcia j*6ijded from rest on a rough inclined plane tilted at an angle ofcj*i36di* a fj $33.5^{\circ}$ 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 inclinewj4a g4j b.srvc,n, 3yjn:(ond plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of sjjsr4cav nn:43g,w,y jo.nb( tatic friction between the object and the plane?