Which of Newton's laws best explains why motorj(l cuv7;j (srists should buckle-up?

  When you sit on a chair, the resultant force on you oqi4r1o cu+o (5l9 * mm+dpz2bh8jemi is

  In the absence of an external force, a moving objg :) 5:kecnnpbect will

  When the rocket engines on the starship Ntho35p+gqfd,b j 4, waO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship w gwjf3h ,d,+o5p4q abtill

  A rocket moves through em* l.gocl.b z+bpty space in 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 be applied to the rocket in order to sustain its mogobl cz+bl ..*tion is

  You are standing in a moving bus, facing forward, and you sudden0 po+5 j.su.rwh s)sb3.vxriq ly fall forward. You can impl3).ix.srwovh.r50us pb jq s+ y from this that the bus's

  You are standing in a moving bus, facing fokh0eo.f9 pin+/)sybr rward, and you suddenly fall forward as the bus comes tiepry9/ fk.nb)+ 0o hso an immediate stop. What force caused you to fall forward?

  A constant net force acts on aqaf4g1, ur blt z9)f+ *k6zhsan object. Describe the motion of the object.

  The acceleration of an object is inversely proport ky*x/0) k riojnu3ia7ional to

  A net force F accelerates a mass m wi3i ,mfm xy5ce irjw1 4vi:o8n2th an acceleration a. If the same net force is applied to mi:fm4wx,jic in5m 8er1y23 ovass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration8; f(vnhzo v72gotsq8chm ,a+ a. What acceleration results if a nett mhq vo,8g;nvof72+s8a hz(c force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the r9l7k(sbxuh8 83un 6xpqbq:m balloon will fly away. This i9b8q:khn7r ( 8lq3sx x bmpu6us an illustration of

  Two cars collide head-on. At every momewzp;k s teuo.y (0y8e7nt during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example (e 07uo;w.pseykyt8 z of

  If you exert a force F on an object, the f2:*8dgc. q deuhiulk 9xosw3* orce which the object exerts on you wi:ocx 9* dq8iukg3es2w .u ld*hll

  Action-reaction forcesqle.3z/1mg z.)s:nd(e vo j zh

  Action-reaction forc-vjhvycz zp*h,n ht/ *t;*0znes are

  A 20-ton truck collides with a 1500-lb car and causes a lo3a dkx yxjkxiib0 - +:3+ucy8at of damage to the car. Since a lot of damad 03bjxkcikyy xa3a8+-u+x :i ge is done on the car

  An object of mass m sits on a f3nnt5wj 0,m1 hitrf l9mq*j ,ly-0 dyplat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction forcej039hnr,* tt0ny l w,mjd -q5ypf1il m?

  A child's toy is suspende;c x x +0n*djybojx2v:d from the ceiling by means of a string. The Earth pulls downward on the toy with its d; :x2 oxyn+jc 0*bvjxweight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you wib q;qudke1gj2 k,-2n nth a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitu dku g;q2qknenbj,-21de is

State Newton's three )ds4 ( qt2ci+d9xinwolaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon sj ts:am u7x++0ipo 0jthan on Earth. Which of the following is true about the mass and weigo:s0 jx+7a pus0tmj +iht of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance zsszh; b+32z5brbji 6 is

  Who has a greater weight to mass ratio, a person weighing 4mr-sgsyaj28 o-9g fy 800 N or a person weighing 6008m8sj2-oy agf gr 9-sy N?

  A stone is thrown straight up. At the top of its path, the net force actintlttue9r- 2o(ib zd7 )g on it i27)tdleo b - t9u(itzrs

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the saxn6 su lsv*ac0yorr*;ak5i0)me height. Ignore air resiy)n 5;aa 0x*rc* ir6 svk0ouslstance. Compare their accelerations.

  A brick and a feather fall to the earth at their respec twucio aaz7-orqxo. 1u*+2/ ative terminal velocities. Which object experiences the g-r tw a.7a2ci+a xuo/ *ouq1zoreater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an p m2 ptnn p.(x.puql:i52m9ocelevator. The elevator is m5( q2p9: pxp o.lpmu2nct n.imoving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceig8i ,-syf5cys s ozz(/ling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the str/fs,s-oi5 y zg8(zys cing?

  The force that keeps you from sliding on an cr :/3z8wdkyj2tv yu0 icy sidewalk is

  It's more difficult to start mov8t*dn;n f f0 kfno)5pling a heavy carton from rest than it is to keep pushing ikft;nf05 nf)* l8dpno t with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surfa3pw fcwww,r2 ;ce (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same witpc wf3 ,w;rw2wh the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ram1.is g j-uob4jp at constant velocity. Thus we can deduce that 1s jb-uo4i.gj

  A block of mass M slides down a frictionless plane inclined at a , i38:0m. yjgkvkx9 ttdq2khjn angle q with the horizontal. Th3k2k0m.j yxj,t8: it9 h qvkdge normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless planah0x tq9yf ,/f, mkpklqrv3br25 *f)g e inclined at an angle q with t qlmk*r/,5 9p0 h3f,kf bt )2xfargvyqhe horizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at .hogp1-ocg58duyz9d1 / w kxc an angle q with the horizontal. The gravitational f/zu1 cw - od1x9. op8ggh5kydcorce is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on / l rm*peac1*avt/u.uan inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration avpu **ac1t/mr. /e laufter being released.

  An object sits on a frictio0js - /hq k3rpo;g7ywenless surface. A 16-N force is applied to the object, and it aopk/sgr0 y;he 3 -jwq7ccelerates 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 m/s in 7.0 ygv-m 9;,g8c vnh3wl/ib jc h4(tm: mqj*.dak s. What v-cyggwtvjmdhlm.3i( hj8/ak;,:4b 9cnm q* is the average 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. What n)ktkt; c+or5 is the net force acting ontk5k+c) nr;to the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a 3ipr4rrzbch 7-,k; nhspeed of 50.0 m/s after travelingrh h-;7p4 rbzkc3 n,ir
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 pusv/; cb, z7udndh a 10-kg mass from rest,bcddn7vuz/ ,;

  What is the mass of a person who .nbse ,jnhtdl 7ak7gq *cg.1: weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface+a6 .oa 7dhtuf of the Earth where thf.adh t76o +uae acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. Whape w5p pc9g(v+jbn65 aguid*)t is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the6)ew5+vnb pppg9(idg*u5jc a Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N cybiz+r2/;wwe e( -v w xn(cf1on the Moon. The Moon's gravity is one sixth of Earth's. Compare the massevwnx1/r( 2ieefw-+cc b(z wy;s of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg rn,)zn-w::qto :rtpbpkz0xv)y7y 9i z ope. Sue pulls with a 15-N force. What is Sean's force if the rope accele: rptoziy)w7vx)yk:nz9 tq 0 n:-p zb,rates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. Ap4 jpk/ay9tz( force F acts on the stack, ank9/ p (tpjzya4d 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 an elevator. What will tg)jp,(;;qoex jjask *he scale be reading when the elevator is accelea j jq(*p)o, ;jsk;xegrating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 6+ukncfej+ i 6c2ggz44 0.0 kg and the elevator accelerates downward with an acc4 ng2cjz f+guci46+ keeleration 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 60sag 6.2v9lkdcrn .* uito 4m3n.0 kg and the elevator acceleratesl.rnc vgn. iad 6*s mo32tuk49 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. One force has a magcur;5ad rm0;-(tu 9kpr 7 fglpnitude of 8.0 N and is directed due north. Theal;m -(ug c9p p r;fr50rtu7kd second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a tmo)jfo km;4bi xp.)9 truck. It is held in place by metal brackets that can exekbjft9 ;o mo)m).i x4prt a maximum horizontal force of 9000 N. When the truck is traveling 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 onqpo o rut5j87dfb0 -bqot72o9 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 time if the load is not to slide forward into the t9 7bjqq7t2 odb08-o5puo rofcab?

  In the Atwood machine shown in Fig. 4-1, if M dlc(l*a50ya o= 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the syste(daal*o0lcy 5m? (Ignore friction and the mass of the pulley.)

  In the Atwood machine s.sy e1()ah v aog75amt15lad phown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the. a( yl7apvg s15maoeah1d)t5 mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force of cz+n6sx4 k ua1hl 7pry8;4l7jpqi(rt100 q4n h rj;7841zy uc+prsl(alx6t ik7pN in a 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 mr,vq ;edxsvd 4:-7qjon 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, what is the normal forcev:-jv7q ; ,eqd4rdxsm on the box?

  A traffic light of weight 100 N is supported by two ropes as shown9l suj(0k3qrr in Fig. 4-2. What are3jrr0skq( u l9 the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the l5 eon :j uol58*z l*t9ltpw8ss5h(nftraffic l*hjl:9*s 8ollwpz8one lfnt5su (55 tight?

  Two boxes of masses m and 2m are in contact with each othz10pbstb 0fwd, b8hk.er on a frictionless surface. (See Fig. 4-3.) What is the accelerati01t. bk,sp0fbw8z d hbon of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a /liz346rrg mc frictionless surfacrimlg463 z /rce. (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. (See Fig. 4-4.) If th(n /g.xj)fd89lz wfws e forward force on the more massive box is F, what is the tension.9fjx )w8wldn/f(g sz in the connecting rope?

  Two boxes of masses m and 2m areinm7wbd laj,5b ,vo -) connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is -bdbv)ijm,l5, o7awn 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. B,c7s 5nt;5dx9a,oq mmi.tjw j8 u:tbrox I of7d5, s85ajtq;out 9wmt:j,ni. rcxm b 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 between a 3.0-kg bo7d73 axyqqb/ ls-n9ilxkz0fc57 kp .nx and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is appp7ndx -scl3 9q fkkzlx775/by0n a.q ilied to the box?

  The coefficients of static and kinetic frictions for plastic on wood arqi-8z (teds lv;kktxt6* j7l)e 0.50 and 0.4( t)7;it d kjetql68vk-lsxz* 0,
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 surf/e0.8ssz4 vth6ebshwace in the +x direction. It slows and comes to a stop wiw4szsth/. sv e8h6 e0bth 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 surface is pulled by a ;xs ic*s m 7.xa,ol6qv5.0-N force. A 3.0-N friction force retards the motionc;mv7l aio, x*s6s. xq. What is the acceleration of the object?

  A horizontal force of-fm) k;3xbpwg 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 given a*k.hec,1gh wiv ldxq3a+ o a,/n initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between 3e vac*1ql +h/h, o.wkaxgi,dthe puck and the ice?

  During the investigation of a traffic accident, police find skid marks 9y9heodj6jn2 60.0 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 the speed of the car when the braj 92hj6yeo d6nkes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) 9 5(o9pw)z0kfn)jtok4 iofql The surface between the more ma(nq 5fl z9t)wkfk9 o 4oo)ijp0ssive 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 on the less massive box?

  Two boxes of masses m f(wku 2fu: 9m gl*um)wand 3m are 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 massive box does not slide on the more massive box, what is the coefficient of static friction blu9 :w w(* fkfu2mu)mgetween the boxes?

  An object is on a frictionless inclined plane. The plane is inclined at ; b;; ;t-lchcf vsyz9ean anglev;y zs;e; bf9htcc ;-l of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes a jh6bx(lx 5)euul6f.q n 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 a86;yeeni tt/smooth inclined 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 smooth inclined plane tilted at an anglqhtpc0,. 5jgta thf j- .d;q0we 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 anrcx: /zx u5fso5*w g jbd(1g,n inclined plane, at a constant velocity of 6.0 m/suj:/,xwrz*g g cxnfbd5(o 1s5.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass8e8b hige0u-).iq d0cxks:2kw c f0mk m 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 sliu6 6-khmn )ra5jk7w qo+5njbrdes 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. The cablebv)7+wy 0 ivyy attacheiyvw +y)0 byv7d to the log 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 inclined plane ta/o(qfjzat6ycwk1f*hwbg ,wb/7c1;p()k cl ilted at an anglel wbj6fwa(k/(/ p7;w ,*fgotcqch b ) 11kzacy of $33.5^{\circ}$ 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 graduallgu aj fx, c.7m(g.1 o:lhs6rray increased until the object begins to slide. The angle at which this occurs is q. What is the coefficien 7.rg(6jf hlgox. a:m1rcs,ua t of static friction between the object and the plane?