Which of Newton's laws r.kmo mrgt1 r9x(5hb8 best explains why motorists should buckle-up?

  When you sit on a chair, the resultant force o0o)q6v,k m)y+wq ihv8p uv sw/n you is

  In the absence of an external force, a moving obc+fppk3 0 zak-sw s2p)ject will

  When the rocket engines on the starship Nt3ow:c:w b :j/xbm.vgO-PAIN-NO-GAIN are suddenly turned off, while tram:wbj/:: bx .t3cvw goveling in empty space, the starship will

  A rocket moves through empty space in a straight line wit,9b 2x4aclwiuh constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied t92i, ulx ac4wbo the rocket in order to sustain its motion is

  You are standing in a moving bust8j+m +rmce z., facing forward, and you suddenly fall forward. You can imply fromm8 m .+trjezc+ this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forwa+f;txlv zd--5)lk yczrd as thef-clz) 5x -lyvtz;kd+ bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the oowe2c t:. 3xrybject.

  The acceleration of an object is inversely prop)puqq kh /nu hm hg0x9,b;8ke1ortional to

  A net force F accelerates a mass m with an acceleration a. If ;2fu4t jm*nv y+cl3mi xu1 cc3the same net force is aplunfu* 2j myxmi c34tcv;1+3 cplied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What accegs c(; 18fzlrpr/.1jy*pryrlleration results;s (rzy1jryrrf.l 1 gl*cpp/8 if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thisa36 qs3k lasb2;nj xf./zp:g e i ap 3sqal :bns6xze/k.f2g3;js an illustration of

  Two cars collide head-on. At every moment during the co;qnv*0v)hv proms3 3hllision, the magnitude of the force the first car exerts on the second is exactly equal )hsr 0n 3p3 vh*vomq;vto 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 wa 0;nv-h7wom yhich the object exerts on you willav;o0w hy-7mn

  Action-reaction forces-2xz5 g,ybflog9h*iq

  Action-reaction forces awohtli7e+u*k u5* p/ vre

  A 20-ton truck collides with a 1500-lb car 6 yd /kp y0lusgl:4vc7and causes a lot of damage to the car. Since a lot of damage is 6y:udps l/ly7gck40 vdone on the car

  An object of mass m sits on a flat table. The Earth pulls olfmy6 .0n; ylkn this object with force mg, which we will call the action force. What is the reactionn yym .k06llf; force?

  A child's toy is suspended from the ceiling by means of a /pi v;w:jmqv(8 :yk 0ybi*jtmstring. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "i jwqp/;: vm (0vy:ykt*mb8ij reaction force"?

  Your bat hits the ball pitched to you wi:b:yy(*wh(0h ciwa1 jy*ghhjv-gin: th a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whohhby0*hnwvcygy*i:(i1gh (j:j- w:a se magnitude is

State Newton's three 3e,py dc+xsc4laws.

  Mass and weight

  The acceleration due to gravity is lower avjc)2myi/x s(pu,w 2 on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Eam )j,i2/2 cs(vxyuapw rth?

  An example of a force wl4:;3e a 4 uvos(fo guli.iz)fhich acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a per*afw7 -ysvq)m*prp , cson weighi ,p)m*aqf-v*w y7 scrpng 600 N?

  A stone is thrown straight up. At the top of its path, the net faoo3ju4v+xf4 ai 6b* )10iehpo z.ozxorce acting on it hjxz3ao .x of 061z+vb *puaei i)4oo4is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the samen aebi z0.(x ckeld:97 ta6lw7 height. Ignore air ren:7itab d 7 k06el(ca9. zexwlsistance. Compare their accelerations.

  A brick and a feather fall to pcvw,+q*mn 2q the earth at their respective terminal velocities. Which object experiences the great, qwv2* pmcq+ner force of air friction?

  An object of mass m is han3rc81hrm zjh01h1whm ging by a string from the ceiling of an elevator. The elevatorhh0wr8m13 rmzj ch 11h is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging tcceg z-+en-3by a string from the ceiling of an elevator. The elevator is moving upward, but slowic- en3g-e+tzcng down. What is the tension in the string?

  The force that keeps you from sliding on an icoflug+mr fu- 54ci) h(y sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to keep 5u;za4;/rkwuyjx/ vwne+m1 cddfs,7pushing it with constan smujvnrxd; 1w;w k4z de,7c5auf+/y/t velocity, because

  A horizontal force accelerates a box f6jn4iw /ebv:47 fxf fky ud;(arom rest across a horizontal surface (friction is present) at a constant rate. :ffdu v6ekiyx4f (aj; b7wn/4 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. Tjp k6 *a20.whv+mxd kohus we can deduce thv0 wk* 6o+kdxmjp.ah 2at

  A block of mass M slides down a frictionless plane inclined at an angl4dfc ypxyi/5 bup5: f*e q with the horizontal. The nuiyxf5 bpp5*: df4yc/ ormal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at-ifa5ix38d) gnb*vbtku+ - 86oxa m mp an angle q with the horizontal. The normb t a+uk-dmb -5x8fxi8 viam)n*36pog al reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angr fix6n dm8+ 8,n(cqvcle q with the horizo8fv qcdn6,8cnmri( +x ntal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are releo:todo)q 61fer )m qrf8 xq0u/y/il d4ased simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a stdiy8 dm:fq oq)l1 4 xfo)qr0u r/6eo/tatement which best describes their acceleration after being released.

  An object sits on a friction ;zk .1ld;yfxpfw5(3k n4 fitnless surface. A 16-N force is applied to the object, and tzp4x;y 1w53nf(. kkfdl ;f niit accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from k: o v7m,r:*b kl-edgarest to 27 m/s in 7.0 s. What is the ad-:or,a7 kbl*m v k:geverage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Whw*l rrek+q4 z0at is the net force acting on the bq 0+er* kwl4zrody?

  An antitank weapon fires a 3.00-kg x14y0g nheua8x6uq5d:g n. 87 mv dmefrocket which acquires a speed of 50.0 m/s aftermgd:x5d4qeuguy8.avmx 7f18nn e h 60 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 push a 1ma t hmr7..3rhy,v3mn 0-kg mass from resrv m7hm yh,.mn3ta.r3t,

  What is the mass of a person who weigh;7mr9 t,dn0szxb6dj fs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of thefw 66ogon y(w z/)i 80lfleo-fvu3p k7 Earth where the acceleration due to g l7w(fe3) n8uk lyozv/o-fwo gif6p60ravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object on t5 fu2th;,:fx do dxwrp4:uwt9he surface of the Moon where the acceleration due to gravity is only 1/6 of th5 ;u :2 ruhw,pxftox df:4w9tdat on the Earth?

  Object A weighs 40 N on Earth, odx 5l*hh bq oyagzr0ep.2.y 7ep o):878fbtg and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Comparehoxbglobh*0paq25e . fo.8:pz yrdg 7e8)t y7 the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite twknoo4ay+w1wm 2lct7gt7-8 ends of a 5.0-kg rope. Sue pulwm l48tgno7 -+1ktw 7cyoatw2 ls with a 15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books restcyr (1ym*w vqr)40osbs on a level frictionless surface. A force F acts on the stack, am s r4yy(w)qcvrbo 0*1nd 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 4vv9x wv3rnjy :g/ cn7an elevator. What will the scale be reading when the elevator is acceleratinn w4 gnyvv:7/xcj9rv 3g downward at $4.00 \; m/s^2$?

  A person on a scale rides in an 998xzg gsms0o elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleratgx s o8z9m0sg9ion of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. z s jdnd,*k;;zmprey6xa) 1e *If the mass of the person is 60.0 kg and the elevatoy rz1 ee,;d*j d xa*)szmpn6;kr 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. Oq d,asg*/fdl, dwh (.op;gjj 9yr()ubne 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 acceleratio,)gq d *(h 9ujyfs dg,dbwja;/plo .r(n of the mass?

  An object of mass 6000 kg rests on cvh 7gftt3p-eu3p s 4gn-f: ;wthe 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 stoppin7t pe p-v33gfghnw; s-t4 fuc:g distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in pl*d;wd; eaf /isu1 rap3ace by met pd/3a*sf;; 1u wdraeial 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 machine shown i5 izg;d9aj 9eht( ogq8n Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the systat;59qz9i d j8hg(ego em? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 2vadjwu,.,b g kg and m = 0.40 kg, what is the tension in the stri,dabjguw,. 2v ng? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force ofh+ zw(tox2-i nllex68 100 N in a dl-n8o(xt l+h w ize6x2irection 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 wq.z w9go.3hd/ ml 3w90lpnwhdith a force of 100 N in a direction of 37.0e above the horizontawh/nw l.ml0 9gwdzdop93q3h. l. 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 - efdew24 -wmpropes as shown in Fig. 4-2. What amwp ef-w2e d4-re the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 hc 2 apxj5q54 8lyms;ae-ns3onz;l5bpp i 9p3N, what is the mass of the traffic lightscmaab 3hl lp-si5 8j ;y9n35zp2;nepp x o5q4?

  Two boxes of masses m o5 k8oucko. 8)*+yn*kud fnxg:m 9nkaand 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the aknnyc*8+ ) akuk.o:ugf5d omokxn 9 8*cceleration of the more massive box?

  Two boxes of masses mqmst(ptyx:( 8 and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the mor (xsp(t mqt:y8e massive box?

  Two boxes of masses m and 2m are connected by a rope. (afy)6r2uh a;tSee Fig. 4-4.) If the forward force on the more massive box is F, what is the tenstau ;fyrah) 26ion in the connecting rope?

  Two boxes of masses m ande efo0(sy+a0x 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 lfo00 x+y( aseeess massive box?

Two boxes are connected by a corw q04kogi +z--z6htca;fx ru2 d running over a pulley as shown in Fig. 4-5. Box I k0a g-z+oziq4h;2 tcruwfx6-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 zs paqpsw5c wi+5+1.hbetween 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 horizs1 h.is+5c pwqawzp+ 5ontal force is applied to the box?

  The coefficients of statiuch:*fy u22x6iiujfm f spkq,i/ :9v/c and kinetic frictions for plastic on wood are 0.50 and q f92sv6ck u/f:*jx:i,hmiy pf/u iu20.40,
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 j9pk(myb+5y4p n h+itdirection. It slows and comes to a stop y(tpk9jhm b+ n4 p+iy5with 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 horizbzxh j)rl9 p328yupae j4qb j9 *fs;0xontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of t0j yeabbxf 2j4j p9u* p 3r8zq;sh)x9lhe object?

  A horizontal force of 5.0 N accelerates qjdg9 4lmc-e5a 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 spee:+(iw4b e.r6gci hhvrd of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck anw. 4hvhri (e6r:bi gc+d the ice?

  During the investigation of a traffic accident, police find skid2gpw( p 3e3dujq :w:wq marks 90.0 m long. They determine t:pupqw2gj:3 3 (qdwe whe coefficient 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 3m are stacked. (See Fig. 4-6.) Theg(,4*6s6bytshstdzz 4b bw/ g surface between the more massive box and the horizon6z(6 t*/ ys4swsbb4g b,h dgtztal 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 are stacked. (See Fig. 4-6.) The 3crojoim . v09surface 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 massiveoicrvm 9oj.30 box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined at annchk) r :nr -5e9q7 -zprtbqb/ angle/b rt-qn)zr k9n b:h7qr-p5e c of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dow2j(fjn 3 fxjr7 npj,ypql,21y4 rt,hhn a flat 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 a smooth inclined plane with an angle luu y):;th/gh 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 tiltecdm19.nl gcf13drx9l d 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 directlys,s(n. f +3epqtl 4vkv down an inclined plane, at a constant velocity of+vkfl,vsq.4npse ( t3 6.0 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 h 5epepd fs*n (d*+x64buas/am slides 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 slid/z9rf:- oct axzjei9jk* 2fdp:zv1 d1es 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. 3xk 0s .whf/yrk3(nqi The cable attached to the log makes an angle of sr0y3.wnh x(f qkik/3 $30.0^{\circ}$ 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 inclined plane tilteuzn,-nkza1i5+ mh8 bknq.( i kd at an angle of na8 h5b(ikq.kziu k1n m+nz,- $33.5^{\circ}$ 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 incl72-zigjk1yygs: fh-o slc p6 ;ine is gradually increased until the object begins to slide. The angle at which 61lg 2y syp-jo:i;gcshkfz7-this occurs is q. What is the coefficient of static friction between the object and the plane?