Which of Newton's laws best2r ;ka7,ejdyjd q d)2b explains why motorists should buckle-up?

  When you sit on a chair, thx - p)iifat (rhey+98re resultant force on you is

  In the absence of an42q2v 5a+ ktx*mrbs de external force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tm: xt7t:h st(furned off, while traveling in empty space, the starship:tfmtxht( s :7 will

  A rocket moves through empty space inieb b/g175f ar a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must bbgfi7a5erb 1/ e applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and yovx+7+7q6tpx ) ,6 +iibzdssyg1cedfo u suddenly fall forward. You can imply from this that tt)g q7 1xoysf6d+ecv+xi,zp7 b6sid+ he bus's

  You are standing in a moving bus, facin(-qs1v7f kxjkj7:b ukg forward, and you suddenly fall forward as the bus comes to an immediate stop. What force c 7k1f-xvb7qs:kjj u (kaused you to fall forward?

  A constant net force acts on an object. Describe the mot(vv n0g6go/1nr 4x bmpion of the object.

  The acceleration of an object is inversely proportirmjx)3d.n ,u+n, cr jsonal to

  A net force F accelerates a mass m with an acceleration a. If the g ko ;xbkwn;. )3jig)ksame net force is applied to mass 2m, then the accj))gkg b;k3o k.wx ni;eleration will be

  A net force F acts on a mass m and produces an acceleration a. What accelq x49 lo mw*68qacqnh5eration results5q9oal64xwm q c8*qnh if a net force 2F acts on mass 4m?

  If you blow up a balloon, and they4hb mxe yf73/ q:yh5zn release it, the balloon will fly away. This iz7hy/bxyeyqf 3 m 5h4:s an illustration of

  Two cars collide head-on. At every moment during the collisioo/u)bc 5zan lt p ,vb-.dv+zw0n, the magnitude of the force the first car exerts on the second u/ bcot,v-)bnlp z d+.a5wzv 0is exactly 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 on an object, the force which the obvtu t7. 2ol0hvject exerts on you will v0 ut7.voth2l

  Action-reaction forceskf6y q j6e hkf:2)8lgt

  Action-reaction forces arcctv++ h5 ; icd.cub.ee

  A 20-ton truck collides with a 1500-lbm *+axbd 3phlzr*6xynx d(f02 car and causes a lot of damage to the car. Since a lot of x* lz dran0 36xyxdm*fpbh2 +(damage is done on the car

  An object of mass m sits on a flat table. T dk6+hasd i7sdjxt; 6,he Earth pulls on this object with forceds7+a,6d6ijt k hxs ;d mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. Tyj za17o1k,tfr)7vk y mt 8le1he Earth pulls downward on tko7rty lfjy) 71e,tz1 v 1m8akhe toy with its 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 forc 3i.+0xavk5iol3 boxz e. The ball hits the bat with ako0z5x. 33ai+i xblvo n instantaneous force, whose magnitude is

State Newton's three l;1kqz1o.9js9 q 6b7abcyn 6* qm znfzxaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earthzm,n(32 5x+x2u.uy ribw mwyb . Which of the following is true about the mass and weight of an astronaut on theunwu y(32mix b+xwbmy. 5z,2r Moon's surface, compared to Earth?

  An example of a force which acts at a distanty* o)5uvp (itce is

  Who has a greater weight to mass t1,t5u4 ntqmaratio, a person weighing 400 N or a person weigt1,a4mq tu5n thing 600 N?

  A stone is thrown straight up. At the top of its path, the net force actigr f8h13i.;tuzm v- ks(;hl69dwo0*hjw ck ozng on 0or;h 83odu;h c vwz*(mwkgl . fk1i6j9tz-hsit is

  A 20-N weight and a 5.0-N weight are dropped aa (,e upv4d1osimultaneously from the same height. Ignore air resistance. Compare tha v,aodep(4u1eir accelerations.

  A brick and a feather(bjx5 s t 5k gy6-no;myngav9. fall to the earth at their respective terminal velocities.5 xg9o k.;a bjmvng(5yt6sy n- Which object experiences the greater force of air friction?

  An object of mass m is hanging by a string from t /u1rb3 od/s/(mgf bophe ceiling of an elevator. The elevator is moving up at constant speed. What 1(/p/og3sfbrmd/u o bis the tension in the string?

  An object of mass m is hanging by avh.wo 9 e8p-do lz;9pacqg/ -a string from the ceiling of an elevator. The elev9/ hpaao d -;ewpc.8-qozg9l vator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sgtz*uq- mrun6t19gn )s) ksu8 zaca ;5liding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than ij:i8-pz a,dku4n6bee so+x )zt is to keep pushingko 4+ed:nazsb i86,p-)ujze x it with constant velocity, because

  A horizontal force accelerates a box from rest acr 7 k /k,hfy4cyu)v:l8lj*qi z41nhjenoss a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions rem7e41 l )vyq h: 4 *nnjjlckf8,hiyk/uzain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides d0, 2m c)xla,mfiw(nriown an inclined ramp at constant velocity. Thus we can dedu2amif, ,x(cn mlw0r)ice that

  A block of mass M slides d6f9b+ h 8nzumyown a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exertemnhuf +698zb yd by the plane on the block is

  A block of mass M slides down a ;isi4 2g2drep;k tz3 dfrictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is directez 3sdr2 gkdiie2t p;4;d

  A block of mass M slides down a frictionless plane inclined at a0kq 6l py7d-y.wao. kun angle q with the horizontal. The gravitational force is directwloydu-kq a.07p y6. ked

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined pjizgt17z gev5zm/iw2: qg5e0lane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration 0 ze i gv2 1ezjt/mi:5qwg7z5gafter being released.

  An object sits on a frictiouve 4;qcm59f sph.:zx z,rmn+nless surface. A 16-N force is applied to the object, and it az4fr q sux :9p.z;+hnv5, mmceccelerates 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 27 .. uej5h:oz z9c nol0yi((odk m/s in 7.0 s. What is the averzo .c on5eu((9yljo.dzi hk0: age forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0.aqt. r1 jrrondi.e*; m/s in 2.0 s. What is the net force acting on the tjd n*.1; re. qarior.body?

  An antitank weapon fires a 3.00-kg rocket which acquires a spex 90s2lusf)c gq svr)(ed of 50.0 m/s after s s2)l(9xq gc0fvsr )utraveling
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*i l8eajpw6acr 7+ k+y you push a 10-kg mass from reste cpkai6a7w+*8j +lyr,

  What is the mass of a person who weighs 110 lbu+ ;om qqdhqu :se()kvhe9l: 1?

  What is the mass of an object that weighs 25 w:q5*x96jnw 73hsxguiqbm :c 0 N on the surface of the Earth where the accelerati x:7xq3hmq9cijwnb *5 guws:6on due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. xrwrz.,pfc um9u u)s688rd 8n What is the mass of the object on the surface of the Moon where the acceleration8u 9w m ,rp6f8d)uxur.zc s8nr due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N 43zqjg buhjlf;xl(0 /on Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth'(/4l3 f 0zlhxujg bqj;s. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends qhb kn6ogm,.8 v ;ptva48 ;ympof a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates towardo8b.km mh 6ngy,;tvp84 q; apv Sue at $2.0 \; m/s^2$?

  A stack of books rests on a lev42 jkpx:0or-bnc 3dpeel frictionless surface. A force F acts on the stack, and it acceleratedocxkbnj 0-p :34erp2 s 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 we-)uwu 66yetk6y2axv ill the scale be reading when the elevaty a u2y-u)w6te kvex66or is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the 7yu3 5dxg2n idmass of the person is 60.0 kg and the elevator accelerates downward5iyxg d 37dun2 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 person is 60.0 oydospz,f9u 0:t0 sj )kg and the elev:9)0pydf0 jzs, so utoator 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. Op:m3 r;:eaef7 tt+a+*gg:r ek 1jiivune force has a magnitude of 8.0 N and is directed due north. The second force toward thefurprm*3ege+ :tjiava i :k 7te;g:+ 1 east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on9sym )cgxg: :*s;h 5 gz-frrny the 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 the9 *:s)g:h yyxfng rs5m;cr gz- 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. It iuc:i3x *.buh gs held in place by metal brackets that can exert a maxhic uu *gx3b:.imum 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 = 0.6) yc0r5m vb4f twtgz*90 kg and m = 0.40 kg, what is the magnitude of the ac5zb) tm94 rc0gf v*ywtceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.4:1* o cpakdarc; 7yri50 kg, what is the tension in the string? (Ignore friction anipy5a;cc:d1r 7*a ok rd the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a 9wqzx4eor q4 ,force of 100 N in a direw qz9q, r4e4oxction 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 .nxc dzt7i-tc*uqd )r) n5d.rbooks on a smooth horizontal floor 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, wh-).ui) *td5d.crczqntx nr7 d at is the normal force on the box?

  A traffic light of weight 100 N is supported by two rop 62t(m)i,oikosjij 6 ues as shown in Fig. 4-2. What are the tensiou,(si ot66 2mi k)iojjns in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the3qk9e(xxyhq j* us o.7 traffic li qke xuqhj7*.9yx s(3oght?

  Two boxes of masses m and 2m are in contac,q *.n.az2 rxkud,cij-1tjy bt with each other on a frictionless surface1tq c2y ,xi..ka-zbd uj*, rnj. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in conk+76pmens*x*c vl 5bv tact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force sl* bk76v*xpvn+5mec on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fidlorze- .08 nn0v*jgxg. 4-4.) If the forward force on the more massive benr-8vgnl0o .d0 xj* zox is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.m*i gg3- 6jxhw) If the forward force on the more massive box is F, w -ih 3jgmxw6*ghat is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown cr7;; wvuazxv e59x3xin Fig. 4-5. Box I o7 ewvxvx;cz;xa r35u9f 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 kinetbdyzk9x; xw8v j733 mw v3uuv4ic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box wv 3zbvu8j4yv3x9;ukwm3x7 dw hen a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are;ml0+f3p v;i-z)be8/z0w hkl ihf ju35svj xo 0.50 and 0ow3vf xm;s ;ubj8jz 3 h0el+)pv0lh5i k-z/fi.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 comeslogt( t1cm 1)il br3u5 to a stop with a constant ac)l5uglc 3i tt1m 1(broceleration 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 uoi+mnwh9hc): :d jy7is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration o+)j::w unmc7i9y d ohhf the object?

  A horizontal force of 5.0 N accelerates a 4.6+nus tmbch9a j 48b00;g fnv0;k 5wfcmfrez3 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 speed of v7wvkv9 3 tts )qncr,c-4 0rpn10 m/s. It slides 50 m on the ice before it stops. What is then-qv )vk347tvrs 9,ncw0ct p r coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find15oybcbiw oe o(cp )vz8x8 4i-86re cd 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 tz-o 8o16ic8(brvpb weed8y o 4c)c5xihe speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) T-bzu0f-q 5v(r wjg;y nhe surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massibu;jgz( ny wf-v5r-q 0ve 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 surface bete4wz uxwepb.lw 0:h b3+;ul8jween the more massive box and the horizontal surface is smooth and the surface between the b0zh x3plwl 8;:be ew+bw u4uj.oxes is rough. If the less massive box does not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plv auic5+hz u*,me3mx;ane. The plane is inclined at an angle *h5xaueum v;,c3m z+i of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides vz9 )oihwhl0po5) xs-down 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 fhb*rareoz4 k:6b 2cu t4f45 rangle 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 sm ,6*qd cnvq( uemmuzc xo,,-3hooth inclined 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,rdjf -1hlfv3g r()s z directly down an inclined plane, at a constant velocity of 6. lzr)sfr 3j-d fgh(,v10 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 rough *uaw7(-;hm fsyrlt0btgwn: d-hf/ ,t $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass ,o5/hq jjl)*r ;nn nqnm 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 along a rough surfac:qkke0 t/ buw0) cx0fue. The cable attached to the log make0k0xu:ew)tucbqf /k 0s 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 inclined plane tilt++orpx/ii q )ru1c. xied at an angle ofic)r.iui1+xrqp/ ox + $33.5^{\circ}$ 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 graduom c(lo8o7 x ;rsk+6b0f1ttab6 gwm. gally increased until the obje;mg. fla(co x+ro t7k8 w1om 66bb0tgsct begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?