Which of Newton's laws best expla*tdh 1hgpr6 s bt9. plxn+9;gpins why motorists should buckle-up?

  When you sit on a chair, the resultant force on *awxijvl wyjh.b9 : ts8.; 2qayou is

  In the absence of an external force, a moving object wi/gw9h5s1qc popkb; w/ll

  When the rocket enginekl/fz /uq2 mn*s on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in enq/flm z2/* ukmpty space, the starship will

  A rocket moves throut h5 1azn(y8:gllev bhynx 0-:gh empty 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 leg0lvz -51n(x: y t:nhabh 8yto the rocket in order to sustain its motion is

  You are standing in a movis no0l)ngy0*xng bus, facing forward, and you suddenly fall forward. You can imply from this that yln0 )0sno gx*the bus's

  You are standing in a moving bus, facing forward, and yox6 /mtun nmi48u suddenly fall forward as the bus comes to an immediate stop. What force ca m4unx/m8it6nused you to fall forward?

  A constant net force acts on an object. Describe the motioljs k(ec 6lk t-386awbrcct9/n of the object.

  The acceleration of an object is inversely proportio /zu-qycl*e0 snal to

  A net force F accelerates a mass m with an acceleration a. If thb may 24wyc-t g9m ft47eg,n-ze same net force is applied to mass 2m, then t-ayn w9m tyc 4g4-,2zebtgfm7he acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acce445es/jmc mj objuz8 8leration results if a net force 2F o jju8445sc /ebz8mm jacts on mass 4m?

  If you blow up a balloon, and thg.g.k* /hhtlq *0u2z )as bwzcen release it, the balloon will fly away. This is an .g tb lu)gz*qwsh /kc*a0 2hz.illustration of

  Two cars collide head-on. At every m*k w,7xfoijc s: es, )rkc6l-noment during the collision, the magnitude of the oc6 jlrsc),kk iw*fn,7:-e xsforce 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 of

  If you exert a force F on an objectsy md3bhj(x42mr8 zg5, the force which the object exerts on you wi zhg5xmr23s(y4b djm8 ll

  Action-reaction forcesnk40 ,y6wmt nn

  Action-reaction forces arevky5ncj 9e okb;s0w+1

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage tomyp35k2elsrcie)5o(;qy. 8.b3xrs d qq y1 aa the car. Since a lot of damage is done on ti1)spl kdqqxb3(ea;s 8omec5.rraq52.y y3y he car

  An object of mass m sits on a flat tab-oifsbz mg5x 1j n87z,le. The Earth pulls on this object with force mg, which we will call the action force. What is the reactiozjz ng-bi85m 7f,s o1xn force?

  A child's toy is suspended from the ceiling by means of i o0ya.z+ql2j l,j4 hsa string. The Earth pulls downward on the tjhqzay oj,l 2 0.4lis+oy 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 zd37 h9im ,hrkjxyd* 0force. The ball hits the bat with an insta0d y3jidmhr9h, *7zkx ntaneous force, whose magnitude is

State Newton's threei47ddo4g+cxma a6ox - laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than o jo/p n34sgk:ln Earth. Which of the following is true about the mass and weight of an astronaut on th ko3j4p/lng: se Moon's surface, compared to Earth?

  An example of a force which acts at a distancpuea*mku;nnl 0p s::504txeue is

  Who has a greater weight to ma n)60pk)3hiruz .g h.g*beefiss ratio, a person weighing 400 N or a person weighing 600 Ne)n hi3)u.6fg*ge b.rzk0 iph?

  A stone is thrown straight up. At the top of its path, the net forpu/j4nhh +rw9,)td )uzf9w zx ce acting on it t),dzxpuwn9ujr +/9h4z f)hwis

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the s 7o632d2ruxiimi 9ti name height. Igno62 ut2 miirx9id3oi7nre air resistance. Compare their accelerations.

  A brick and a feather fa, *twa c9ohi0chmk+c)eh8elzcme 86 ;ll to the earth at their respective terminal velocities. Which obje8cehhm9* ) k ezotc ,ch0l wci8;+6emact experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an eleval:fttx95 x;dh tor. The xth59fl;:x tdelevator is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a str,tf:l6ju- xu3au:aqying from the ceiling of an elevator. The elevator is moving up :fu,xaq6la jtuy3:-uward, but slowing down. What is the tension in the string?

  The force that keeps you from sl,i4qr4fs dn s9iding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it isuk7.)-h4 j5hp af-hja1bs xyq to keep pushing it withy1hs4ah 5k h )buaq--j .x7fjp constant velocity, because

  A horizontal force accelerates a box from rest acrossl- +/ s6v1lxoc)lr2 rduqjr*s a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force rr6r- j/cl 1l*x+ ssouqv)2dlis doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus we ca9enf j- tjvev)ud5 id+:kz;c3n )dfie c9e3 zkn v5t;vju+-jd:deduce that

  A block of mass M slikp (i jrubs937imk6k1 des down a frictionless plane inclined at an angle q with the horizontal. The normal reirj9psmu(6 7ki k k3b1action force exerted by the plane on the block is

  A block of mass M slides down a ic+g ;zp16wji frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by t6+;iwz gci j1phe plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle qi sj/7;g n ktf9fgj1 ,r(cbd +zx0ulp9 with the horizontal. The gravitational force is dirrxgsn1; pjgb,zf c+d09ti9k(l /u f7jected

  Two toy cars (16 kg and 2.0 kg) aag v,ifro/r4pj3 3t12;vpdhtutb+k /re released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after beiratj1uhovr2fk+v/33p;p ,/ dt4 tigbng released.

  An object sits on a frictionless surface. A 16-N force is applied to tm0 1 iagem/+lahe object, and m+alemg/i1 0ait accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of massvtmba*luy j 5k+tdto0.37n4u 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the aver7mod5kl jtbu +a30n*yu4tvt.age forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s ig0s2qme.md tycnf0 u9e 2-q0q z1zj)i n 2.0 s. What is the net force acting on the bouyz qq92j)m cgeq 0e02m ti-fn. dsz10dy?

  An antitank weapon fires a 3.00-kg rom -r (u,.c.p+nfwggygcket which acquires a speed of 50.0 m/s after t.mp, (rcf.ngu+ gw- gyraveling
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 10-kg mass fmb*rvit(d7 hqh4v a,7q me)1 crom re(qc hi)mvr*v7be7t d aq 1m,h4st,

  What is the mass of a person who weigh-gt:eodc;qi+7 lq:5-luf ,nsw van )rs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth ezwc197wl+ v owhere the acceleev+ 1ow7l9czwration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object onaw4(kdu-2i7r qkn6e t the6ki q7 n4-edw2ar u(kt surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth,z x;6p;g62yqd dun3yn and object B weighs 40 N on the Moon. The Moon's gravity is on xgdu6y;;dn 3p qz6ny2e sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-omhqlem 2ql+i j8u5 2u5f-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the +5l2ql8umue 52ijhmqrope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionles6 cbtntjo4t, 5c+*wzys surface. A force F acts on the stack, and it accelerbc5*6nt+o ,t 4jczty wates 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. djvk g9i;,l zh/vzh8; 1u eb,e8/nxjg What will the scale be reading when the e/;gnv lxde, ge9zkijb 1;h 8ju/ ,z8vhlevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mas lqwl u2yi2imjcw )d:*g5.n;is of the person is 60.0 kg and the elevator accelerates downward with an acceleration l2wdiq* g2y:.l uiwci; jn )m5of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If01 b9lw) q wpv)g.qhdk the mass of the person is 60.0 kg and the elevator accelerates upward withwdw1 klb)g)h 09qvp .q 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 magn o;fq;2yg3vqxitude of 8.0 N and is dirf2vq;yx go q;3ected due north. The 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 truck. It is heaa7idn o-*5if.oma npzy*t+6xga)l8ld in place by metal brackets that can exert a maxim6 digfa- ai )*n8*+.o noxat7 ylmz5apum 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 on the flatbed of a truck. It is held in pla7v,+eqd 21c v hszljm b0my+;ece by meta 7y v1m ec2+ d,+m0bq;jlhzsvel 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 in Fig. 4-1, en6o( qhwr0guszxg-qo2 m h+b8tr2: *if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (I8u(grqm 6wq-gosx+: onthr 2e 0 2zbh*gnore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kgku3 jn *h7bz7 .czxyr/, what is the tension in the string? (Ignore friction and the mass of the pullecj3bx yr/u*z7 7nh.k zy.)

  A student pulls a box of books on a smjk2cwgu45bqty,:0iatl.l* se 4k0b/fpy d2 booth horizontal floor with a force of 100 N in a direct5sy0t 2blelb:b4 .p gwkk/ a,f *0tjqd 2cy4uiion 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 floord:a;rrfz/ kx oy *e84e 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 forcyd;fz rx /8ke:r*4a eoe on the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Ffovr l55t 6fv9ig. 4-2. What are rvffltv956 5othe tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what i(n ujs + 0pj/xngu- tro(e :u8ef)jl*ks the mass of the trafts u(l)e8-nuj0( :j+fgxp nr eokj*/u fic light?

  Two boxes of masses m and 2m are in contact with each other on a fric3;n 5uzgkj;wyz 8zs;etionless surface. (See Fig. 4-3.) What is the acceleration of ke;z3u w; gjy;zz8 n5sthe more massive box?

  Two boxes of masses m and 2m ar(6svg v6di62ryfyp 4 fe in contact with each other on a frictionless surface. (See Fig. 4-3.) Wha iry6p(6gy6vfs4 vd2f t is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope/d5 iz2ow2 dtm. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connec 2modt5id2 /zwting rope?

  Two boxes of masses m and 2m are connected by a rope. (Sep(*q5lnwffnf -5l z34 7 i t,vtqzje1ue Fig. 4-4.) If the forward force on the more mas 4qtzlvpfjl13 ntue zwq *i5n-(7,f5fsive 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 ii- u+ goj mf/o01zgg7xn Fig. 4-5. Boo/xz7g0o1f mg j+-ug ix I 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 between a 3.0-kgd96 2wu8hed :/xj,p qkz(kont box and a desk are 0.40 and 0.30, respectively. What is the net force d6q 9j2u,(pn xeo8/ktzwkh :d on the box when a 15 N horizontal force is applied to the box?

  The coefficients of sw s6cdun9y3mex;,dn -zz+;xz tatic and kinetic frictions for plastic on wood are 0.50 andx9,e6xnz; y c3z+nzd-mud;sw 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 theyvbya7; o .jx9 +x direction. It slows and comes to a stoxvy oy 9b.aj7;p with 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 pulled07+ m4*pupgu ai)lkuk by a 5.0-N force. A 3.0-N friction force retards74k +apk0u*glmu )pui the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, fu oossb8c s (qc-f8hxezl ,90)rom 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 10 m/s. It slides 50 xzx)w 1)8bc ihub9u h-m on the ice beforexbwu )zu)bx c9ihh8 -1 it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find ski ei+ 1oeypst)7d marks 90.0 m long. They determine the coefficient of friction between the car's tires and the ry1te+o 7)ps eioadway 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. s vg zb6sd -)f4c:)x1g8rjfxu,hp2 zz(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 slb 46s)1ruvzdfcx p,)s-8:xzhfz j 2ggide on the more massive box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stackecm8 n8 (xbqcrgy*,8 w(fk )qn0i nrds6r 6uah.d. (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 dbs0 )a,8cry*ni.r( n gkrx6q8fmncw du h8q6( oes not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclinepmb:w *z- ;f1dy ei jq7ulg,)jd plane. The plane is inclined at an angle g-zdiue 1)q ,7j;wylbp:j *mfof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an tlf a 3o: b/w2.wm(x .jgm4gwfangle 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 -t4njpf0v/m bof $37^{\circ}$ 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 smoor-6epb a7k.n9 e yds7tth 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 slidesjx040m jlwop;ph gw8/ directly down an inclined plane, at a constant velocity of 6.0 x4/0jwpop gml wh0j;8 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 slidp: lum.hio6)iq l5 q.ls:as w.es 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 down a rb8 :4umhf uo mrw-hm44 e7gqt+ough $37^{\circ}$ 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 weidv r h ta-ian2yqeb4kh1v,mkfu39ad( f.,45nghing 500 N along a rough surface. The cable attached to tv hek,ry4 an d25qnf (3hf ub v,.4t1kmaa9di-he 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 plad-c t*6k*kq dtne tilted at an angle otd* cktq-*6k df $33.5^{\circ}$ 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 incqrw3,hokvx(e2y4 6r xb n 4y,e82 sunhlined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coeffici4,2h24xenwe8hryb yruk ,v os6 q x3n(ent of static friction between the object and the plane?