Which of Newton's laws best explains why motor3pve57spn;bm2 ( 33 gzi vjteaists should buckle-up?

  When you sit on a chair,7ct xxq-)v m-t the resultant force on you is

  In the absence of an external force, a movi) ev f.z 5z9rzguj0cf9ng object will

  When the rocket engines on the starship NO-Poo) tlgdzs34/;bg0 i zAIN-NO-GAIN are suddenly turned off, while traveling in empty space, z)o3 s4li;otd0 z /bggthe starship will

  A rocket moves through empty space in a straight line with odgy8 + aouh-v(g:z u7constant 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 u :g+7g hyv(d8uzo -oain order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall forwaoo3kt * 3eke7m7+t* .vbjlb md;,ipjrrd. You can imply from this that the bus'7 ,lktje +33re*kvtmo;b7om. jibp*ds

  You are standing in a moving bus, facxx e*bm.e/: weqb pn(x6lm: n)ing forward, and you suddenly fall forward as the bus comes to an immediate stop. Wenl* wpx):/(eeq6 b mnbmx:.x hat force caused you to fall forward?

  A constant net force acts on an object. Describe the motiqe pj.-oswepo en2a b4q;,4q.on of the object.

  The acceleration of an obuhz9xx j*rz );j2;h i 7.tqtumject is inversely proportional to

  A net force F accelerates a mass m with an acceleratioyf;0aju yt;ey .2 a-/psyog 5r(4mxoy n a. If the same net force is applied to mass 2m, then the accelerati4o-ram5 x u;p(g2yt0 ye/yfao;jsy .y on will be

  A net force F acts on a mass m and produces an acceler -d 2zh3myzhlxpk0: l,ation a. What acceleration results if a net force 2F actsx- yzpzh dhllmk:0,3 2 on mass 4m?

  If you blow up a balloon, and then release it, the balld 7pq0w ucg b* +,hvpsm68e1 bi6t0kasoon will fly away. This ib7+mp sc0a1g 6 wb 0sitd*qv6k8pheu,s an illustration of

  Two cars collide head-on. At every moment dq )c56f m d5ngiq2aolu0rm(4w uring the collision, the magnitude of the force2ar qgu5cfdi65 n0)wo4 l m(qm 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 cw+-a9ulo*ja an object, the force which the object exerts on you willow la*+uc-9aj

  Action-reaction forcest db7ql1siw:7o; t,ug

  Action-reaction forces are.3dqnx-jh d3rto tdfx/u +( 9k

  A 20-ton truck collides with a 1500-lb car and causes a lsj79 ce-ic,xo ot of damage to the car. Sis,ec x9i7c -ojnce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object axtq6 asldh-kq b7 -:6with force mg, which we wil:tsk a67 - lqh6-aqbdxl call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. Thel kjbrb j2/u4jt6y+2x rm52yfs lsklv-. m72o Earth pulls downward on 7+myl2jky2ux vs.lor- 6jk2 24tfj/br bls m5the 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 hlivo01 9f7f 9 1 krs,tpz*hnfinstantaneous force. The ball hits the bat with an isrvl9zi1fo7,9np 1th f h*fk 0nstantaneous force, whose magnitude is

State Newton's three lawsjqt;dy+2i *gaj4i9 f w.

  Mass and weight

  The acceleration due to gravity is lower on the Mo 4o/ewf n3x9wlsh36 fcon than on Earth. Which of the following is true about the mass and weigc 6fwx/le9fsw3h n 3o4ht of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distancwbmq:- p, t-gqe is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person wesboa h.h5 ;c h9hxqr30,:sjald- h+o mighing 600 o.hbhm+s3 ,;5 ch-x sad0 oahjlrqh :9N?

  A stone is thrown straight up. At the top of its p0bl kbd,8x1ed ath, the net force acting on it i0exb1,d d8lk bs

  A 20-N weight and a 5.0-N weight xzx4amvs1ykfrd27w5)n 66 kb are dropped simultaneously from the same height. Ignky sz 764rm2 )5xd6favb1xknwore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their rev ;ue ta8r/kkx9 p.xi*spective terminal velocities. Which object experiences the greater force of air faku /p8;itv*9xe r.xkriction?

  An object of mass m is hangh)gk;xrtihf n6z9 9llcm+ (/xmq )cyh,x,k u+ing by a string from the ceiling of an elevator. The elevat99xqg+c,c x;l/h 6x)mtzk mh+ lr(yh,i k )ufnor is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string fr w.)dyom:q*nrj5q 2ve om the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tensionvr.)*qwye2jqn md 5o : in the string?

  The force that keeps you from sliding(bbu:2v 7ab;jbdg/xk f/w u3c on an icy sidewalk is

  It's more difficult to start moving a heavy carton from res onxg+d+ 7d wqzmy;54st than it is to keep pushing it with constant velocity, becau nzq5dms+wy4d g;+xo7se

  A horizontal force accelerates a box ikv7qum kr* yepmg(22* /rv 7cfrom rest across 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 is doubled. What happekkci7( qpu* ve2mm*rr/v2 7 gyns to the box's acceleration?

  A packing crate slides down an inclined ramp at con *af( m/oo.g1y3exewm pq1 3kvstant velocity. Thus we can deduce thme*x1pvam/ k 3w.o(oy 1 gf3eqat

  A block of mass M slides down a frictionless plane inclined at an angle q with ukx 4c wvj0x, pcz64l:the horizontal. The6:zluk4jv4,cw p0 cx x normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q wiho2ptz7jr,5gc z63 x1-wvsuz2 ulm(z th the horizontal. The normal reaction force exerted by the plane on the block is direzz61toxpuz , mwv2sr5z2-(uc3lg h j 7cted

  A block of mass M slides down a frictionless plane inclih vd5ax *m4q5dned at an angle q with th m *x5q45advhde horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inchh ra e 1+hu*p rybl,5lq1q*m9lined plane that makes an angle of 30eaqrrpy+ u59 hh lh*le1q*b1m, with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N g9kt xhjlwb8;z xk;5zr5oi61 uj j v*;force is applied to the objectiovwg 5 x;;zrltj;k z5 1 u8x6jhk9*jb, and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rsm2 8emk v2uhql6 vpi9:9dun*est to 27 m/s in 7.0 s. What is the average forward force onmlm262h 9:q pi 8* uevuk9sdnv the car?

  Starting from rest, a 4.0-kg body refu;ry1u89tj t hki) a2aches a speed of 8.0 m/s in 2.0 s. What is the ne;iju1t hf9ta2y r)uk8t force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquqbt y)/2oepyox19b39e w z2yuo hhv:, ires a speed of 50.0 m/s aftp:qowu ,9hexto 3o/1 hv yzbyy)22e b9er 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 maz1 ) (qknvsp nwid.u 2vm74+dnss with the same force that you push a 10-kg mass from res+mndnq1s4.z n (u )wpkv i2d7vt,

  What is the mass of a person wh xo-2 y 1ukq))7k tenps79grrzo weighs 110 lb?

  What is the mass of tmfhcf*3 y:n) an object that weighs 250 N on the surface of the Earth where the accelern):ft3c *fy hmation due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is thepeg6fku1 mm,)i nb2) e-gag/x mass of the object on the surface of the Mooabp1 2eu- g6gf/em)gm)ni k,x n where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and objectzb:). ztv:eei zs3 4ywuw f*:f B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the oz):.3e:bz ts fye 4fv: *uwwizbjects.

  Sue and Sean are having a tug-of-war by pullingj dni pc z0xg3-j.n;cd74u;qk on opposite ends of a 5.0-kg rope. . 4c7dck-;jp jnnzxu0; d3gqi Sue pulls 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 lev;m47gnxramf 3el frictionless surface. A force F acts on the stack, and it accelerates at gm347r n ma;fx$3.0 \; m/s^2$. 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 thee7pwb4b v;m u6 scale 4w7 up6mvb;ebbe reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevato4e2v, b ecchy2r. If the mass of the person is 60.0 kg and the elevator accelerates downward with an accelerati2 v,bhe e2cc4yon 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 theag3v*wtb: bi1senj a 2g+ 7op2 person is 60.0 kg and the elevator accelerat aw2inbbe+j :og*1t3sv p a27ges upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on ap1)3veus1b5 yke iwze8m0 t 3a 5.0-kg mass. One force has a magnitude of 8.0 N and is directe kemb3su 8e0i5 vat3z e1)1wpyd 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*o ,cga8hxwf x ig+1u( of a truck. It is held in place by metal brackets that can exert a maxigcw a+ xh*( ,o8gxiu1fmum 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 ob+ml x q 3z:+ 9whjnyx;( ykctnex7(n-n the flatbed of a truck. It is held in place by metal brackets that can exert a maxn9 n+eb lm +xz7j xky;qh(3t(x:cyn-wimum 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 = 0.60 kg and m =g9ehq35s2adqz dxo+p0 gb4w10vl5x5x qs :d x 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frictiols4 5501xxpsv h:3zox+q9bx5qddg g adq0e 2w n and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-16l4k mnf g86rcs 2 e)jdek:6pv;uqj* v, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of6: )edgkfjm6n vjvlq6p*;r euk28 sc4 the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force of 1danp4wmuk.e(j3 sd z5w6 .p 7t00 N in a direz sdm( p3tkj.wwud75e n 46ap.ction 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 with m ;5akn897wcn) zljcna 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 nl7)knzcaw9njm ;8c 5normal force on the box?

  A traffic light of weight 100 N is supporte)da9 hf6+f2nb0em qtd):cw zqafl+d5 d by two ropes as shown in Fig. 4-2. What are the tensions in the rd05me a9fw6tfc 2+d: h) b dqna)fzlq+opes?

  In Fig. 4-2, if the te)t;zhz ye7ro nx*fq( : zv0*ahnsions in the ropes are 50 N, what is the mass of the traffic liz aoz *th7f( v q;0e*hnrz):yxght?

  Two boxes of masses m and 2m are in contact with ea x2- + mf k ;n0,ufrukg(l+hcqzhs2z,pch other on a frictionless surface. (See Fipu-r l++h h(0czznk2qx2 ,fgk;sm uf ,g. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m anxrc8- kglv: gj5 26cuod 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more k rgovx:u 56gcjc82-l massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. o;mo ) rkncxp1v-ebf y7ab 7684-4.) If the forward force on the more massive box is F, what7y16xvona7-bpcoe ;8)mkf br is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by 4q4p stt0 br bs/mx+r9a +lnp*a rope. (See Fig. 4-4.) If the forward force on the more mb9mqnx /pbrtt44la +*s0 ps+rassive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord run.1daxet,tah -ning over a pulley as shown in Fig. 4-5. Box ae,h1tta- d.x 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 kinef (738lw r0fcn5pdt( 1wv. mmwej 6wpwtic 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 when a 15 N horw.mc1w p 08m(wvrwjed 3(w7lf6n 5tf pizontal force is applied to the box?

  The coefficients of static and kinetic frictionsg)*b u gjd na7xvx:7s7v)acu. ;( ublo for plastic on wood are 0.50 and 0.4 dl:o7( ;.gjvx*7a uuvxbc7)bsa) ung0,
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. Itkn7 u xcet7fxd3ei- 8: slows and comes to a stop with a constant accelerationxie:x3e78nd7kut f c- 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 pu-nf 3nan+w/ nclled by a 5.0-N force. A 3.0-N friction force retards the motion. nn/nwn-3 f+ca What is the acceleration of the object?

  A horizontal force of 5.0 N accelerate7 jmxferffen(g99t34u30 oam s 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 initial speed of b dfbmfi7:u/ +10 m/s. It slides 50 m on the ice before it um ifd7: bbf+/stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find sk88a: fhsq pn;iid 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 co8p;n fi qash:8nditions. 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 surfarnvajwu.u0 ;ww)n 6z 5ce between tn )a;.wu ju 0rwv65wnzhe 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 on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betxe/ y lkt f*hyi+(d3z0ween the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less ma +fy0xizyd/ h3e l(t*kssive 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 plane. The plane is inclined at an ang hymf3q,d f z4waenmu041)8(n egs9xy le of zd8 yu3wm90gq(fm4 ,4e xfhsanen1) y$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an ang hk8ckafx7 takqxw5 5 8.g4hd8le 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 angiisgxs8/b3, u 0.a ujlle 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 z a(j a f52xfybx-m9i4plane 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 dowj:f/gdbq3lc 3fnh.t , n an inclined plane, at a constant velocity of 6.0 m3n /,bhftl. cq 3jd:fg/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 rou) b aja*2u. mkt tdi,vw2i9q0pgh $37^{\circ}$ 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 roug26sqzpf.dbmi h9tm*u**vm8; co mb(zh $37^{\circ}$ 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 rough0k;uww)7v/1(v dw rkb jy*gn1 (b xaiu surface. The cable attached to the log makes a kbk); (vavuw g(/71iju1y 0wnxwrdb *n 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 c kh9(93 k kg5 fjy:ac.kq)ovbon a rough inclined plane tilted at an angle of k 9 qc(3bkf5kjav9 g: k.c)ohy$33.5^{\circ}$ 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 inclinedzs6flu. )ubpth:j/ s . plane. The angle of incline is gradually increased until the object begins to slide. The angle at which /lu6j t. :h)p sbfusz.this occurs is q. What is the coefficient of static friction between the object and the plane?