Which of Newton's laws best explains why motorists should bucklg9rzyo p/cs; qciwd;2 cj 9j6:e-up?

  When you sit on a chairy zsgj+3wuar:ly0pafl 7f* 74e *idoxa3;wh+ , the resultant force on you is

  In the absence of an external force, a moving obj 811tju v2rsggect will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sudi3wueru5a 4oc pr8p( +denly turned off, while traveling in empty space, the stars puo4rc r85iwu+ea3p(hip will

  A rocket moves through empty space in a straight l6:;dyby-evfwb8b(ve s r, 8rud a2,vpine with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that mw v,:db(f es, e86uvy;-a2y dvb pb8rrust be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forwa/vhlsg5- /,ri by032t xijw vofr0p1 trd, and you suddenly fall forward. You cbivt/- ,j 5 /w00poytr3vi1rlfxs2h gan imply from this that the bus's

  You are standing in 9 4qibvx bh4:ca moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forward?4i9vb c:qbh4x

  A constant net force acts on an object. Describe q2m23q z- letzjdhe:*the motion of the object.

  The acceleration of an object is inversu5fic0eu kw;f;xe 2+nely proportional to

  A net force F accelerates a mass m with an acceleration a. If the ht15g.na.tk,a ct,hgqo 7uy 0same net force is applied to mass 2m, then the a.t hn 1o 5aga0,,kqy.ghttcu 7cceleration will be

  A net force F acts on a mass m and produces an acceleration a. What accelerati);hjx7 3zrt i7y;1tdt,fh9nzh ;owpoon results if ai1f t93t;h hy;pjw;,zoo7)rn7dtz xh net force 2F acts on mass 4m?

  If you blow up a ballebup3i ;3lctp t 7wvgi55,mr8oon, and then release it, the balloon will fly away. This is an illust gluttr e i5,wm8; p537ic3bpvration of

  Two cars collide head-on. At every mom i55jct2 t13utq9ekkfktf w42ent during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the m 54u kkj523k9it2 qte c1wfttfagnitude 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 objbor2 u)s8z8b xect exerts on you wib )xz o8s2bu8rll

  Action-reaction forcd /:-11o .vedzgr tooges

  Action-reaction force gg stxwyh 2o:.o(s(p+s are

  A 20-ton truck collides with a 1500-lb car and causes9m5m(h o(i7k+xpg;slffg . w/d/bf k4*u vm lf a lot of damage to the car. Since a lot of dama p7+4off*hb is wmdlgm( k5fmlfk. (x;u/9 gv/ge is done on the car

  An object of mass m sits )do,rc ga-ep4x7l37hphmn 1x on a flat table. The Earth pulls on this object with force mg, which we will call the action for 7o7x ah3hxegp)-,d c14r nplmce. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string.vehe/ *ynl k-295 kofh The Earth pulls downward on the toy with its weight fnve *o92ye kk5-lh/h force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitccnq.- 8en 5 b6lodr:urhed to you with a 1500-N instantaneous force. The ball hits t 85cnr: odn.6ru-le bqhe bat with an instantaneous force, whose magnitude is

State Newton's three lawiz27/qc5ye9ttdz ; zw y7;vo ns.

  Mass and weight

  The acceleration due to gravity is lower on x p:9m:hrr1tbi- lp x0the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's srb0-mp 9xx :hrpitl1:urface, compared to Earth?

  An example of a force which acts at a distance is-8xslpz:i w 4 nhhlct.a22 1fe

  Who has a greater weight to mass ratio, a person *g7;fwtw e2 osweighing 400 N or a person weighing 600 N?o7*eft ;g2wsw

  A stone is thrown straigvc,mk h m36,xaqn/ru5 ht up. At the top of its path, the net force acting on it i5 h,a3unc kvmq /6,mxrs

  A 20-N weight and a 5.0-Nv;+sm8f-m nq m weight are dropped simultaneously from the same height. Ignore air resistance. Compare thesmm-;8mqn+f vir accelerations.

  A brick and a feather fall :-4t2.s ri rva opdwh/to the earth at their respective terminal velocities. Which ob vh2ado.p -/s:r4it wrject experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevac jda-*v9av1ator. The elevator is moving up at constant speed. What is the tend1va * cjaa9v-sion in the string?

  An object of mass m is hanging by a string from th 8;nlopg( *clxe ceiling of an elevator. The elevator is moving upward, but slowing down. What is the te(p8lgolc *n x;nsion in the string?

  The force that keeps you from sliding on an icy sidewr u67t9fd.d6 fe8w rewalk is

  It's more difficult to start moving 1ka63dm zuo9r mxq+ vszp+ ;,wa heavy carton from rest than it is to keep pushing it with constant velocity, becuom6dkrx qvw+p1m+z,;zs a39ause

  A horizontal force accelerates a box from rest across a ho ,oae/ff,98 ejb ciok4rizontal surface (friction is presenieca /4fkjb98 o,foe,t) at a constant rate. 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)2:gjs/tadoj3iz h t, an inclined ramp at constant velocity. Thus we can deduce tha2: ,jozds jat)t i3h/gt

  A block of mass M slides down a frictionless plane 0rb59oyc qx2qinclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the0 rq9q 2co5ybx block is

  A block of mass M slides down a frictionless plane inclined at an ang0 qam8;bvcbsbcy*- 3gle q with the horizontal. The normal reaction force exerted by thc-*m;3syabqgc0vb b8e plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an anq6mfus f:a;)ev( cd0c gle q with the horizontal. The gravitational force is directe s6dvfaf;mc:)u0qc (ed

  Two toy cars (16 kg and 2.0 kg) are releaseh., oisi6w uk*d simultaneously on an inclined plane that makes an angle of 30e with the horiz*iswi.ku ho6,ontal. Make a statement which best describes their acceleration after being released.

  An object sits on a friya8,p)av 3-ciu6pjt xb7lt +sctionless surface. A 16-N force is applied to the objectlsa v+ui 6xy3j 7),p8a-pbtct, and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of massw+jowg/ 5p5 o. gk)ybc 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the wgw5+)c.bo5k /oyj gpcar?

  Starting from rest, a 4.0-kg body reaches a ydj)k26m8laispeed of 8.0 m/s in 2.0 s. What is the net force acting on the 2)ad kjmiyl86 body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 5xnr/w 0lewqzo* h,a hnmu4/890.0 m/s after travq9,heo/n0w* xl8r w uanz4hm/eling
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 yol nc npoao;z3c;x1p65 u push a 10-kg mass from rest,;acx3o n1;6np clp5oz

  What is the mass of a person who weighs 110 lbj+ ;w wm:cqw) s51lmqf:g:nvz?

  What is the mass of an object that weighs 250 N on the surface nye ig80yyq8ke2t.4y of the Earth where the acceleration due toe k8gni.4e2 8q yyyty0 gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the ob1rx6k(;* c7:paouik )hyvjs 3ojhn)k ject on the surface of :ky)s upno3i hjco(ra1kh v6; 7*xj)kthe Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earb3m2 2 urnhx4cpyb0t+9n e; fsth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the x2yr tmp2 ;h+b3n4b f90cs nueobjects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends o 6dhc l,v46enzyf,x1g f a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's forc,1x6d v4c h,gfy6enlze if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictik hd ag fte,k:d; (;xupx*vx/*onless surface. A force F acts on the stack, and it va:*gd ,*xk;h ux(xkp; df/te 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. Wb 8 nc2rj;3atzv2a, )ewhgv1uhat will the scale be reading when the elevator is accelerating dowu r3vhe2 tcvna8w ,gb)z1;ja2nward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the ptr6.6 u c0ygwi1c)n +wc,eepuerson is 60.0 kg and the elevator acceleraen0w6)wp +gut,y.c6 1cuc eri tes 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 ec p o( -,,)vfzt fg(gq9( gpg06nlunjelevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an accelera,o-j9gg pg (evffuzq0lc( t(n ,) 6npgtion of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5z3 tl.d9 nd1ni.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The secon t1.ln z3dind9d force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kgtv z gb5lqk9bzc9lw:;*/gh w5 rests on 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 the minimum stopping distance if the cl ;h zwz5* g9qw9:btv k/5glbload is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held n)x1 /abmvd(rou;5o ain place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 1ov(5m1 ban )odr ua/x;5 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machin cf0-wbl)n4yy8c +uqke shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system u-cy+ yc q0wl8nb)4kf? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kgvu4kbkvh*j,4vfd p,-qk p +2k and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pul*4k 4kppkvubh- j,,d qkf+v2vley.)

  A student pulls a box of books on a smooth horizontal floor7 9j.azjq *3odlg27 h+zdmu vo with a force of 100 N in a di77odzhjd9 +q* jgmzao3vlu. 2rection 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 su7oly um0(9)h, dtvc with a force of 100 N in a direction of 37.0e above the horizontal. If the7,0o d9yl )vuh( tcsmu mass of the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of w1gf7-3vh-k 7 u luhajqeight 100 N is supported by two ropes as shown in Fig. 4-2. Wha h3l7 hjaqkv-fu7 g1u-t are the tensions in the ropes?

  In Fig. 4-2, if the tensionwty452sc z 9tgzi-u3i x.8bu7 y xq/pds in the ropes are 50 N, what is the mass of the traffic 2pd 7xt.8ustzyw i c/5x3z bi4u -9gqylight?

  Two boxes of masses m and 2v 5buz7g52y9ronhv58n4m kclm are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the 2n859gnv 7 vybzhl 45mkoc 5uracceleration of the more massive box?

  Two boxes of masses m and 2m are in cocz)0 pub)jfkef55z:e i3 0jy dsgiq +/ntact with each other on a frictionless surface.3k/py ij) )dzzc 0fs0u:b+fee jqig55 (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. qw*e6n 6p-mex (See Fig. 4-4.) If the forward forc-wee *pn6m q6xe on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m a fepzsr sob;s)lt +,(8abpa ty4(i 9(fnd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, wyz( ir(+f,tsas 9pob l4fp t;)8sba e(hat is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in lq)ifh:q6z5 ,yia;v kFig. 4-5. Box I of maiqqa:5f6vl;k) yiz ,h ss
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 ;31etrzbt )k3q *ht ieand kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectivel ;t33t)tbe ke izq1*hry. 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 fo7.*1uwex anv gr plastic on wood are 0.50 and 0.40gn eux w*a.v71,
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-jt x(,klr 2tn comes to a stop with a conrkt(2j,x l-tnstant 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 horizontag hb 1+c/gbv0xl surface is pulled by a 5.0-N force. A 3.0-N friction force retards the mhbgvc+ b/ g0x1otion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass,c9 zh pzk1/e3ny3j z8o 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 101)k:8kw bzczwg:;ixo2 )i)o tpi wpb7 m/s. It slides 50 m on the ice before)io72)c:xkp8wg zpwbk1 :io) i wb; zt it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, uj3xn c *jz .deesu15r7zdy8-police find skid marks 90.0 m long. They determine t ncr 5ydu8zd-7.z1 jese*u jx3he 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. (Sp ;zb ld)u;erve8dbpb ;w-++jee 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 massive box does not slide on the more massive box, what is the static friction force be;d+8d;)bjp- b; up ezwlrv+on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface bet*bqycpar6hx q 1pk kk;vb .9*/ween 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 thr*bbk;v*pqyhk 6 pakx /qc.91e coefficient of static friction between the boxes?

  An object is on a frictionless incline *vj2nv i*vsx6qm lihe tfeh-6()o 1-hd plane. The plane is inclined at an angle ofet-sh *h6- v f)im(o6 vh*i2njxl1qev $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill thqlm 986,wc ;5det bkumat 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 inclv3gj/k.* ycyp ined plane 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 smoota tg)bv7o5cx /h 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 directly down an inclin shdbrdh: ,ork 8d64+ om;ol/pv-v 8nged plane, at a constant velocity of 6.0 m/s.; - vr so/hnr khb+:,mo68 ddlpgod48v
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 rougkxonf 61b +7h,v. z, vunt0yozh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a massbz3zc.c2x6.rzjn v(n m4h 7t*e8 xtu t 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 4 rw1clt)gj2 e500 N along a rough surface. The cable attached to the log makes an angle ofel4w )gcrt2 1j $30.0^{\circ}$ 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 reglu;:0kh3bvnt5mz.f/x6y e kst on a rough inclined plane tilted at an angle o6yh b.gme ;u3vtkf/0xk z5:nlf $33.5^{\circ}$ 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.:5v::oj syxn+,je nam 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 static friction between the o vx ymj:5 sne:,jna+:object and the plane?