Which of Newton's laws bestq3g3go- hgx2tbu o(k9 explains why motorists should buckle-up?

  When you sit on a chair, the resultant force on yw3ih6fox;pv )h *mz jetg;4f9ou is

  In the absence of an external fy4(c irzr:/p porce, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-Ggon2igb, /c ( tdo3,dzzz79jd4kaw 9j AIN are suddenly turned off, while traveling in empty space, the starship wilb92ti, gg43n ck,djoajozdw/z( 7d9z l

  A rocket moves through empty space in a straight line with constant speed. It il(7s9zzm.7mmgy 4dogs far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to th9zo smyg7g(l m4.zmd7 e rocket in order to sustain its motion is

  You are standing in a moving bus, facing forcw.,zcw(z (nb qq 5z8hward, and you suddenly fall forward. wc.qc(8 q n(b5hz zz,wYou can imply from this that the bus's

  You are standing in a moving bus, facing fo1siy6s jc)al*/a 9ioprward, and you suddenly fall forward ascoipa 6s9/1 a yjs)i*l the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. De67khwf x*c 7qhscribe the motion of the object.

  The acceleration of an object *wh s ;hilocf2;a8m21nq3iatis inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net forcsmad).di o(a6rwe)vl/ :m l8ne a:s.ml6l v8od wd ( )rmna/)ieis applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceler;rsdm3r4 r onr.yd6fk 1 7k*spation a. What acceleration results if a nksr1o4smf67; 3k ddyr* prnr.et force 2F acts on mass 4m?

  If you blow up a balloon, and then release ipsf 1qz:d r*)vf:*ot mt, the balloon will fly away. This is an illustration of ofrp dv1f*: qszt)*m:

  Two cars collide head-on. At everxfi.ket 4z2yvn- 3t5a a*lxa 6y moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force t.x* i53v 4xnaa6a-k2tt ylefz he second car exerts on the first. This is an example of

  If you exert a force F on an object, td g)mk+0l5 ek.-xkt sel n-xr9he force which the object exerts on you willm)grklx -n-k.te xdl+5ke90s

  Action-reaction forcg*5ksnh.( miu) x :jpnes

  Action-reaction forces zjn v**yx+-xmne7 4jdare

  A 20-ton truck collides with a 1500-lb car and cause 9x4k/ tp innio*/7vlgs a lot of damage to the car. Since a lon t*lg/k4/ 7ixonv9 pit of damage is done on the car

  An object of mass m sits on a flat table. The Ee ygn f4ax92m9arth pulls on this object with force mg, which we will m g9fen42ya9 xcall the action force. What is the reaction force?

  A child's toy is suspended from cte c.cy* o8r7the ceiling by means of a string. The Earth pulls downward on the toy with its .c8reoctcy7 * weight force 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 forceg1jp 2qp.tkad mi9e(w: /9cv z. The ball hits the bat with an instantaneous force, whose magnitude w1t9mva jpq( pi:9d.2/c zegkis

State Newton's three laws.r gtd11prthcp;9 -l 5d oib:x1

  Mass and weight

  The acceleration due to gravity is lower on th5,ahovf9hym: o yhq7np(d wk ;b2(ax 3e Moon than on Earth. Which of the following is true about tha2ho9bmkn w( ah 5:vp3(; oqx7fy hyd,e mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whnnf4ap7fd5g0c8 zhy) rwc56e)/w) ber d ol.mich acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weigfw9llnj1ajc k* zj -390l/com8lz 3yehc0lj fwo/1a l8 y*zme3kln-c j3j9z9ling 600 N?

  A stone is thrown strnqw7p y.(wr /paight up. At the top of its path, the net force acting on it iswqpprn 7./( yw

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same h-67u,zddne sw8d75bsd4ayc p eight. Ignore air resistanced dc 67w,y5susd 7pb48n -azed. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velo wul9qk x(ru+-p2yenk9 v:l+ rcities. Which object experiences the gre wlrekyn 9v x2+u-pk(:r9 q+ulater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator.romnt(o q6 9rq 1l9g:m The elevator is movin:gm9mtq1rr (6o qnlo9g up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string fro*z.r5f . adwtsm the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tedawf z*.s 5t.rnsion in the string?

  The force that keeps you from slid2tl-p4pb9gkx 8,(nx5r uxhf ;p avwl+ ing on an icy sidewalk is

  It's more difficult to start moving a8, zoaq2mu+yrg)qoh4ixg kc* n j4q+/ heavy carton from rest than it is to keep pushing it with c4 q/ 4xj ouy+)mn r,ggqcai8okhz*2+qonstant velocity, because

  A horizontal force acclz;u/ay . 9tjfelerates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is re9tl/. ay;zfjupeated, 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 atugo+1,: ex xyg*-vbisx8,gcf constant velocity. Thus we can deduce-1ox+fcu ib,s,8g*x g: v gyxe that

  A block of mass M slides down a frictionless6.5egpjemmsz8qsqgpiw44hb 34q.6 r)cv 6 c a plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane onq 6p 5gj8epm)shgiac43rsvq44m ecz6. w.q6 b the block is

  A block of mass M slides down a frictionless plane in)*n w4sbn(vsog7 .w neclined at an angle q with the horizontal. The normal reaction foro)ngn .ssn*e(vwb4 w7 ce exerted by the plane on the block is directed

  A block of mass M slvbe* aci4ah -/ides down a frictionless plane inclined at an angle q with the horizontal. The gravitational force is deca-4/ h ibva*irected

  Two toy cars (16 kg an/4(4f2r a5miuvj i(cuqycdu; d 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make uidcuvy 2 u /4;j5(qfr(ci4 ama statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to lze z9zb-.r) vthe object, and it accelerlz.)bezvr 9z -ates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 2day4thz( c z: 2ik1vh.7 m/s in 7.0 s. What is the average forward force on the ziv 4h dt(caz: y12hk.car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in xe3xhi -rk f mgg01oyj6 j8vqe78 9nj)2.0 s. What is the6xi0 )g8 jh9 ojej8x yvqern mkf-g317 net force acting on the body?

  An antitank weapon fires a 3.00-kg 1kv79thyil n -k3 1fy0kq8pyf rocket which acquires a speed of 50.0 m/s aft nkl9h78qty 1i1yyf3 k pfkv-0er 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 pz w:t/0izc/z x s29bdqush a 10-kg mass from restt9b q i2zw/0zdx/:scz ,

  What is the mass of a person who weig2ppd5, w9ft +q qmtq;;b l,rgt.psfl 2hs 110 lb?

  What is the mass of an object that weighs 250 N onq)1k3gm-c84zgqsar iee; y /yao u0rkro/a6- the surface of the Earth where the mr/eksz1g/q6k3)o a g0rr;- 4q u8oye icya- aacceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Eauq(5 dwq7qqdl(1ufat4 yq52ku vr;w(rth. 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 duw52( q7qtyql f54q(dqw;(v1uk r auon the Earth?

  Object A weighs 40 N on Earth, and object B r -czd3u9,(de*yj vkbweighs 40 N on the Moon. The Moon's gravity is one sixth of ,d(bvyk3r d*e-zj 9cu Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ec7 3on cg6zbh1)vmdx s o2vot9s915fu nds of a 5.0-kg rope. Sue pulls with a 15-N force. Who 91txvs76mbd9c)o31v fhso 52gnu zc at 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 brp)a903mcmj( lt o 6isurface. A force F acts on the stack, and it acceleratet cml 9ri)( 60pao3mjbs 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 elevatun,vw .a; d nz 0cxq+/rcu8l8xor. What will the scale be reading when the elevator is ac ua/d ;88rz,c +c qwlv0x.nxuncelerating 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 0hd)j6 0zhqg- zh+ilqkg and the elevatord h0lijh q+6 h0z)g-zq accelerates 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 elevator. If the mass of the pe b j7xm eiy4.ojr8,fu:rson is 60.0 kg and the elevator accele,7 j8xbj 4uyofm. i:rerates 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. On/koc;oq q f92ebqq,h4e force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of th/;q2b,q9kfe4 oq qcohe mass?

  An object of mass 6000 kg rests on tkvu3q0 z8gnt8qt,h 4n he 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 minqk u380z vnn4t,qtgh8imum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbe7s)2*pk (5y l xl0makwoh; xxpx i(3gqd of a truck. It is held in place by metal brackets that can p205(3qi7w lx *ls)pg ;k(ohm xkyx xaexert 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 machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, whaa6r:xd :4a3gi emmdwvm5m 4f2t is the magnitude of the acceleration of the system? (Ignore friction and the masve 2amda: fdm5gr: i6w 4m3x4ms of the pulley.)

  In the Atwood machine shown in Fig.c9m/ ln:u.prb 1czp9e 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mase.cm9z p lncb1r: /pu9s of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a forcfltrd 8p(a 6 nj5)e1x2cke )ece of 100 N in a5lcd jcx(8fen12r)a k6)pet e 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 h8b csa d23ye/vorizontal floor with a force of 100 N in a direction of 37.dvb/ea8s3 c2y0e above the horizontal. 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 two ropes vf;y( .0lzgs ras shown in Fig. 4-2. What are the tension rsy0vzf(g.;ls in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, wh-vr h,x.r +psi ;4eh4pei5is uat is the mass of the traffic xsh,5 + iuvhe44 - .seippi;rrlight?

  Two boxes of masses m and 2m are in contact with each other/iji ;)o3qsnd on a frictionless surf nq3;sio/)dijace. (See Fig. 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 fri5k 7 r3*okhzeuctionless surface. (See Fig. 4-3.)rkkz 7he*3u5o What is the net force on the more massive box?

  Two boxes of masses m and 2m are connecteds -) gm5-k bjo.7d3u wsv5g1uwb(s dko by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connectb -(mgwu -bgu 7js5okd5k w.o) svsd13ing rope?

  Two boxes of masses m and 2m are connhsg; b5pev;56cju6ms9 czyo 2ected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the le 25hvbysc6z;;pc6 mgo s9 5juess massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5g.) m zy(klh63d .v2 jbpu 1yyo-kn2id. Bodz.kpngo.6 yl2d2khvm u3(yi)1- jbyx I 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 stng)q4igdj6+w;fe a 4satic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectivelgifs4+6qej4wg n; )da y. 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 bqc c91bwpt n -y2,*5vf;ornbon wood are 0.50 and ,ro5tpv2*fcyn w n-c b;1bq9b 0.40,
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 directi;f+3+z,g,g bp wfk odqon. It slows and comes to a stop witk oq+d,gfb3 p+ ;fwgz,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 horizontal surfad3 swi,/7yj- tperqw 1ce is pulled by a 5.0-N force. A 3.0-N fris1idyp, ej3t/7 wr- wqction force retards the motion. What is the acceleration of the object?

  A horizontal force of9 :cbhrt84yv7inmu. gke d2 1frb8dg/ 5.0 N accelerates 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 givcb+b )ne lj )0o)g8ijnen an initial speed of 10 m/s. It slides 50 m on the ice before it stops. Wha)jnocb 8)lj+nge) i0 bt is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police fin o+fs+r: nbpb2o :;bnid skid marks 90.0 m long. They determine the coef;nfir n+b: sop:+2bb oficient of friction 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 p75 9 xzxrio; ob5,mzt3m are stacked. (See Fig. 4-6.) The surface between the more massive box and rzx;p5toz5,ixo79mbthe 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 massive box?

  Two boxes of masses m and 3m :bh9kq+w9 w 1u -bk7vsh; xbt.vnbm*aare 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 vh9+.t1a; :*b smvwhu7 kbbw-9 qnkbxmassive box does not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a fr,0e1sbvtouc./.tjp:n rey fdb* lc 90ictionless inclined plane. The plane is inclined at an anglu.fc:,.0jp sbo e*tybnvtc 10r d/9ele of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that m)hq5 t h2xr*,ybley8 kz-sx k;akes 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 withg dnkh-2, )n uuiuvguq) h74xq z45kb) 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 anb w4)10eguvuiwm vt21gle 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 incliln+, p .gd7d gw;/g9 m9sy;t 7cenacshned plane, at a constant velocity of d7s+s,/ 97ypn g;.edc;gt 9mg wnlc ah6.0 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 pi ,y)ww1 l/-ir4asqr.w azs :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 mass7nfz8: d )u+mwe xfr(y m slides 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 5 whmkge o3z5ae nq1z)-v 35qwalong a rough surface. The cable attached to the 5zw k1-qvwm zea ne5g3)3h5qolog 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 released from rest on a rough ee*wa*)zaeva iq0ssba/ ((*s inclined plane tilted at an angle of isz**e0e aqw /(e(*a)b sasav$33.5^{\circ}$ 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 in: - a9pichwjiy(vh ld2b5c h)+creased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction wjl h2ahccy 9)ip-v5+i (:hbdbetween the object and the plane?