Which of Newton's laws best explains why motorists shouldgtztv - ar5zzws.2p84 qo/l.d buckle-up?

  When you sit on a chair, the resultant for ww,:-dptuat5v z t7k2ce on you is

  In the absence of an externavxhy tm.fzys:i .5/ v.l force, a moving object will

  When the rocket engines on the starship NO-PAIN-NOurm jcz7o0s:o 62wx xqnv:5 *l-GAIN are suddenly turned off, whil*w: u2rvx x5mzcoq0:nl67osje traveling in empty space, the starship will

  A rocket moves through empty space in a439esdro ep 3a straight 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 its motion issr aede394 o3p

  You are standing in a moving bus, facing forward, and you suddenlywu:d5forn (damq- 9y; fall forward. You can iud-q9:(oma yfd;rnw5 mply from this that the bus's

  You are standing in a moving bus, facing forward, and you su6d.d kft2p2un* tz+ff ddenly fall forward as the bus comes to an immediate stop. Wh2+t2dtzf p u*.6ffkndat force caused you to fall forward?

  A constant net force acts on k jg,x)s 5cu6ladv/+ian object. Describe the motion of the object.

  The acceleration of an objectybve3 +j(xbd7 is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If tkjcxs*5k4cif1bl0x)4 nr kz+ he same net force is applic1xizl0kkx+f * )4rn kcs j5b4ed to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an accs f3inhp )b9.bnci 1l5eleration a. What acceleration rel5b bhcsnipn if9)13.sults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then relea 4y,*xgjuv 0is3a kyj;se it, the balloon will fly away. This is3jjys kxya4i*v0g ,u; an illustration of

  Two cars collide head-on. At every moment during the collision, the magnitude ob c sbc7ds p/mm+gv3*079 scg;ji 6lkxf the force the first car exerts on the second is exactly equal to the magnitude *;sj3v dccsm7k9b6+lp/gx ims 0g7c bof the force the second car exerts on the first. This is an example of

  If you exert a force F on an op m7f30+b b6m(vfcsc gbject, the force which the object exerts on you wil0sf (b6 +gccmv3pb7f ml

  Action-reaction forcefwjp2mmsb k 5:*ifb9 2s

  Action-reaction forces a bj9tbrh4 qzg7o: oii*yo4zvsq): 89ere

  A 20-ton truck collides with a 1500-3vn pk- zq.9rglb car and causes a lot of damage to the car3p .kvqznr-g9. Since a lot of damage is done on the car

  An object of mass m sits on a flat table. The m/ eb(- .(mgyikxxl ;sEarth pulls on this object with force mg, which we will call the action force. What is the reaction forcme x/.g ;b(kxs(miyl -e?

  A child's toy is suspended from the ceiling by means of a strin1, c5tyn0imidg. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "y 5dcn1 im0t,iaction force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneouy4(n;k m4h quus force. The ball hits the bat with an instantaneous f yn;mhk(uu44q orce, whose magnitude is

State Newton's three k uuo9-frnq,6 u kjw;1laws.

  Mass and weight

  The acceleration due to gravity g-mrqu8a.lt +46 :jnzfkda 1eis lower on the Moon than on Earth. Which of the follgjz .e6+-q1 lnr4auf :dt a8mkowing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance ixk2 k k78apv+5*znsqbwjj 2h-s

  Who has a greater weight to massblo,lzg1r5 9 vh)e ,ce ratio, a person weighing 400 N or a person weighing 600 Nob1)9lz,,5vgc ehlre?

  A stone is thrown straight up. At the top j b240johffxk*(9 jqw 9fq)+eoywq.s of its path, the net force acting on fx)hjjsoj9(.9+qwk qfq w*0b f2yo e4it is

  A 20-N weight and a 5.0-N weight are dropped simultaneously fr,jge-:-ql t *lsje54cge )p hzom the same height. Ig:z-gjleh5,s )jcpg*t- 4 leqenore air resistance. Compare their accelerations.

  A brick and a feather fall a/7g*0gl0am xg v q 4brsqr.6hto the earth at their respective terminal velocities. Which object experiences the greater force of air frictislg7q a*mb g v6r g0.ar/4q0hxon?

  An object of mass m is hangin f9h-hu(v cvl2g by a string from the ceiling of an elevator. The eleva vl9hu c2fh(v-tor is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string kstxhnb ;z z4u0/)o7wfrom the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the hk)/; x7stnz0woz 4 butension in the string?

  The force that keeps you froee oupettwo 1)8 ,gaqc04 q4o)p78wkwm sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to ke+ h9;wpzkzs- fep pushing it with constant velfphs ; kwzz-+9ocity, because

  A horizontal force accelerates a box from rest across a horizoztza0c 0x4badbxr 1 2-ntal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception tc 0bdx2z atb4z- r0a1xhat the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclil*2by/g a: 8oyoij8pwned ramp at constant velocity. Thus we can deducb*yp8: /jwgoa oi l2y8e that

  A block of mass M slides down a frictionlo b5nr00ozqf7nvn +-y ess plane inclined at an angle q with the horizontal. The normal rea7nnon z-o0v0r q 5byf+ction force exerted by the plane on the block is

  A block of mass M slides dowhrk5tpb c cks+nq af1p6+z)e5m5g)q .(;msz xn a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the 6rp ) z5ngcefz kqts )sq+1(;c5bam+mkh p.5x plane on the block is directed

  A block of mass M slides down a frictionless plane incli03, 9emcmr tkhned at an angle q with the horizontal. The gravitational fker h3m09 mtc,orce is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined planb4om0/:yg 7j as;:fkdu;6gyaesem8 oe that makes an angle of 30e with the horizontal.f6osmmea g:jo;k e7b /yagu0d:8;y 4s Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to s*- xnx+gehg7 naj*m5 the object, and it acceleme*ag *x+nshg n7x j-5rates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 100y rfm h t8tr x .k-mgc5j;j42.xuelu+70 kg can accelerate from rest to 27 m/s in 7.0 s. What is the avgkxj7 2j;5f -ty4.mtrx ul h .ure+8mcerage forward force on the car?

  Starting from rest, a 4.0-kg body reacha2a; 38it -ml.aum4zt48b(htupel w ves a speed of 8.0 m/s in 2.0 s. What is the net forca tl3wb i48eu .am82a( tp tvz-;4hmlue acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a ep 6bnyr/xzfuk)k6 2+speed of 50.0 m/s after e)+kkf 2znrb 6p/6xyu 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 1 * j(ynbtrhaea 3nw0340-kg mass from resty ne3 (03h4t bwana*jr,

  What is the mass of a perg; b8 avx grc87 p3tq2nnqy52tson who weighs 110 lb?

  What is the mass of an oeb/ of0kb 0* 2nzrpz4 a)yslr7bject that weighs 250 N on the surface of the Earth where the acceleration due to gravizo spn07a0 r/4kr)ebyflb2* zty is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass osk36m 9ah* nygn0f1d lf the object on the surface of the Moon where the acf nk9ls 3 *gmah016yndceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Moon'sf5- hgrw /fs(s gravity is one sixth of Earth's. Compare the masses of s- sghr ff5w/(the objects.

  Sue and Sean are having a tug-of-war by *uco,)fqf6 u()4eozhppqr( hpulling on opposite ends of a 5.0-kg rope. Sue puu4)q(,cq(oh) * 6ppuoeffrhz lls 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 rests on a level frictionless surface. A forceby:v 7l6xrxj4 l)9 jy2pcso.v F acts on the stack, and .2lpjx yry:vcb o4) l9jxv 67sit 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. What will the scale,7fjf9n*e arlkt,e at5qw3k2 be reading when tft73n jq *ta,5 k9ka2w,felerhe elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If thext8vnfcv6 h sn ,.vu 112qm*bf mass of the person is 60.0 kg and the elevator accelerates dowv2scvn .q6vf ftb mu 11nh*8x,nward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevato; stzt fd;3 )ufrix40sr. If the mass of the person is 60.0 kg and the elevator accelerates upward with an a;ftti);zdxs us 0 3f4rcceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass,s6zuh qzp+lqg95 a /w. One 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. Whzp6h , sazqugwql/5+9 at is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in place 3 qj1v:kw8o)u;yiu r89ek aviby metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is tra : q8)3e;9uk1ivki8a vruyj woveling 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 flatbed of a truck. bc::xoi e+-n nIt 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 forware+n:x c :nb-iod into the cab?

  In the Atwood machine shown inbfnve *e (ah0 aedd572/e-siq Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the *ebf(-iq2 0 a5/heeed7ds anvmagnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine so0u x6x4;v4nvfc2j, i 5sctz ahown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension inca v 0;cs v4no 6,x2tijx45zfu the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a forc3ou2+rf w 7zjsvil2p0e of 100 N in a dir j3ropu+v i sz7lwf202ection 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 withfokbs 8r dpke*7gwnm ctpeg. 18s321, a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 407st 2ce np8ggomr1bek k 3p*wd,s1.f8.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is sup x epp7ho tsd5c465d6z(bl;upported by two ropes as shown in Fig. 4-2. What5 6tbdch4 zpsop(5x; 76d pule are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the roqc:)kpynru p*d3k xq/39o/ urpes are 50 N, what is the mass of the traffic light?r qqp:ck)3okp3 /uu dny9x*/r

  Two boxes of masses m and 2m are in cont ;9ba/-q. br fmqh5-epj xii(xact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive boi mqeixa /xp.bqj;bf -9(-h 5rx?

  Two boxes of masses m and 2m are in contact with each other on a frictionles +0zhs6f8urz hzd26obs surface. (See Fig. 4-3.) What 6zrf2h6z s8+dbouh z0is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig.i1:ownavi ( ets0g(5vrq ph: 2 4-4.) If the forward force on the more massive box is F, what is the tensiongp i qhv1wt(se(aovr5 : n:02i in the connecting rope?

  Two boxes of masses m and 2m are connected by a b )u:ar*6.vlzwx bw2fr d5mq2rope. (See Fig. 4-4.) If the forward force on the more:lav5dz 2rbwm b2 qu)x*w6 fr. massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. cyor* x:tf/pgaf*cpes/2z, 9 iy,ra/ Box I ofoy9przgfc2pt rs :a/ei,/cya* ,* f/x 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 bev/ :s,tdiij5g-5e nfrtween a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when af/ i:-s, ni5tvjg5e dr 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wolvp;-yzjamegd26 a+f8:; n wood are 0.50 andn;- 6dv z ol+jwfy;a 2pga:me8 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 direction. It slows and comes to a 2hl1 y:ivlors8s c6xjc(2iwzk5f4m9 stop with a constant accelera8m( 6jys2c2 xiif: 4slc1v9wkhl5 z ortion 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+6 k pz.ioqb)t.0-N force. A 3.0-N friction force retards the motion to)k zbi6pq.+. What is the acceleration of the object?

  A horizontal force of 5.0 N w -qp e.5*(hn usvikzbk ):au(/tq;duz*x7 baaccelerates 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 given an gkkr:/l w7f .j m9,n8bzfrsr 3initial speed of 10 m/s. It slides 50 m on the ifs8nz g br9kr7rjf,. m/k:3w lce before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, polipwy wyb/ .;0qwce find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be ;0/b w ww.yypq0.500 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.) The szq n/tkn941p.r0jiaddrzgxem 76.l( urface 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 sm7jzi/6r4k9pn qxl0. eg1 d(nad rzt .tatic friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) Thewr7e y )x0jti4 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 ftjx7r)ie0 y4w riction between the boxes?

  An object is on a friwl+(xc +z)oldr29mc wo5ezaf+f; v;octionless inclined plane. The plane is inclined at an angledwc5v)w f+ar9 fo +ez2 l+ o(;lomz;xc of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a f7q)ousy70v - .ctoanrfxt2 /blat 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 pt 8gjmbkq0 no(- 8+tzvlane 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 ie/.s6 wjw 4h 7zt;a+m,rjcv)f)xsxifnclined plane 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 plane, atgbe j9f *o1sw5 a constant velocity of 6.0 m/s9js1gwof 5e* b.
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 zqy7m p67;gx yslides 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 ;io5 ra bcj+n-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 w63bk hbey1r9v( z jiu1eighing 500 N along a rough surface. The cable attached to the log make16k3z urebv91y(ihb j s 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 incli h8j+;tks jw9y mht..g/37r ccq4i uzlned plane tilted at an angle k8q;t+mtcil.z7hrg4hu jy/c .w s3j9of $33.5^{\circ}$ 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 an1/zom4+,sllkpai gax-)qtpem *2 o+ q inclined plane. The angle of incline is gradually increased until the object begins to ximp2s*,lag olpkqe1+ o/ a-ztm4q +) slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?