Which of Newton's laws best explains why motorists should buck 4;yvgu5pt2 bele-up?

  When you sit on a chair, the ref6:uiiqbsls a*+ te-4sultant force on you is

  In the absence of an externcwf(,c3nakk0)dqa ;f bffb 9+al force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenlyqg5nz(8h2jy x28jku zrq k:( t turned off, whiljqnjg2h(u2t qxz z:88( kk5ry e traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constan.z+ 5*v1t 9h4vye hs dtx/;4 ewmkbdcwt 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 susb *9m/cdsv tv.y h5e1wet;xd+4 hwkz 4tain its motion is

  You are standing in a moving bus, faci 4 jyrl+ee5tu9ng forward, and you suddenly fall forward. You can imply 4eeu+5jr tyl9from this that the bus's

  You are standing in a moving bua e rjh8/d.m3cs, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to faljr m83c.he ad/l forward?

  A constant net force acts on an object. Describe the mo m/xqgq-0q * c bs-po.wm.h0ontion of the object.

  The acceleration of md42ybf;ic m4an object is inversely proportional to

  A net force F accelerates aschs u0- mg5d4mx3. gw mass m with an acceleration a. If the same net force is applied to mass 2m, thenm0us 3cd .gw-4 x5mgsh the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acce cl/g ze/9j+sajdus at(nc:3)leration results if a net forcs 9/g3uda j c)/s+:lzc(etn aje 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the b:/7qlko0nq flalloon will fly away. This is an illustration oll :k 7fqn0o/qf

  Two cars collide head-on. At ever0ca1gp.2jj2n+mm:0 x r3vue v p7gkpdy moment during the collision, the magnitude of the force the first car exerts on the second is exu+p2gr70 v2p xn10jj pk:mac3 ed.mvg actly 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 obxk 1.g 2tyb)ceject, the force which the object exerts on you wile .k12byc)gxt l

  Action-reaction forcah6 ngl i:d4o6daa w2;es

  Action-reaction forces ar:7a e nt5 akwmsf3-m7dwd.:cf e

  A 20-ton truck collides with a 1500-3im i7ti/uf58o2ggp r9s(w zb lb car and causes a lot of damage to the car. Since a lot of damage is dozwism7 (g5 iu rg83otpb 9i2f/ne on the car

  An object of mass m sits on a chbq i5uj6me sbj 13;1 lk ysg)p8ht9:flat table. The Earth pulls on this object with fo6s1c) hlh q8m5y;itjg9 jbs3b: pkue1rce mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling bzq( *ip dczw7-y means of a string. The Earth pulls downward on the toy with its weight forcpz (z*wq7i cd-e 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 force.p v rg;h088cey f6wfc8 The ball hicf8h;pvfe cgr w0868yts the bat with an instantaneous force, whose magnitude is

State Newton's three law(j d7)p pz*sjxs.

  Mass and weight

  The acceleration due to gravity is lower on the Moon thanmzj 19s6;yd to on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?1s mjto6dz;y 9

  An example of a force which acts at/z+ zr:iduji6 a distance is

  Who has a greater weight to mass ratio, a w3.vdy.m hb 5by v f)5rtf bbxv6*29ezperson weighing 400 N or a person weighingzx26w3.v 5ef* bv hby9brfd.vymbt) 5 600 N?

  A stone is thrown straight up. At the top of its path, the nem :x y8h nwi.c5;.(ehpuqwy1et force acting on ith5 y ;mqx c(..e:8u wpe1ihynw is

  A 20-N weight and a 5.0-N weight are dropx9 hc guj-n9o4*4 b*zlq qq-iwfx/l(b ped simultaneously from the same height. Ignore aqqjlb i4 *q nlghx -cx4( uw9o9-zbf/*ir resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective hh36l 5+35jdddj inun terminal velocities. Which object experiences the greater d3hl5in+j3 udj6d h5n force of air friction?

  An object of mass m is hanging by a string from the ceilinoutsv8eq+k a2k+h6 sja*9s2 167crjq w1 swezg of an elevator. The elevator is moving up at constau9as sckz1 *s 86jj71vr+2wos we6th2ak+qeqnt speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of 9.ib r3q8 dfr,21,mjw, wdrxmumu1cvan elevator. The elevator is moving upward, but slowing down. What is the tension in the st1rmu, .jqm fvu92 ,cid8 w ,3xdbmr1rwring?

  The force that keeps you from sliding on an - mkx.j:zf1oahy 2j .hrq;h2q icy sidewalk is

  It's more difficult to start moving a heavy carton fromg ihoo+/b2 -rsmbdx,e2e3 *c )fezu q5 rest than it is to keep pushing it with constant velocity, sm5/dgqb*e)3,o ubxe2c o 2rf+z h-iebecause

  A horizontal force accelerates a box from rest across a horizontal surfac +wl6zksds1u8 e (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 happens to the box's d8 6k+ wuls1szacceleration?

  A packing crate slides down an inclined ramp at consty- jdiit1o+(x/l1n- i-j y(m6dd scex ant velocity. Thus we can dej6lyid -y tc-d+e1( 1mx/ioxs -(dni jduce that

  A block of mass M slides down a frictionless plane inclined at an angle q with tgzwb/7kcr *5 fhe horizontal. The normal reaction force exerted by the fw57gk bcrz/ *plane on the block is

  A block of mass M slides down a frictionless plane incsw6 ; hl. 6eaojtuiy84lined at an angle q with the horizontal. The normal reaction force exerted by the p8w6s jiye;ou4l a.ht 6lane on the block is directed

  A block of mass M slides down a frictionless 1g /v.4m 04ln4f j. :rtb: eneglkgjv(reogj-plane inclined at an angle q with the horizontal. The gravitational f fe/-1rg.t l. kvnj:4ej m(oegj40v:n4rggbl orce is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined plr06cv2dow - mliz:y.rane that makes an angle of 30e with the horizontal. Make a stateme6-ivwz2yocr:. rl d0mnt which best describes their acceleration after being released.

  An object sits on a frictionless surface- stipof:,xu/ . A 16-N force is applied to the object, and i /-:sxi,t pouft accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerorjl (p84mh s2ate from rest to 27 m/s in 7.0 s. What is the average forward force2mr jo hlp8(s4 on the car?

  Starting from rest, a 4.0-kg bodc-hln(edm8jt6i /cr +y reaches a speed of 8.0 m/s in 2.0 s. What is the net f r( +th 8cn-l6mi/ejdcorce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which/kbx(tq9 r4p, m lgn;v acquires a speed of 50.0 m/s after v,p(ltx4 9qnm;/bkgr 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 mass with the same force that yuhc5xf r :e)m4ou push a 10-kg mass from rest)xhcm 4er5:fu,

  What is the mass of a person w7llaeg-re a::,cj 9x9w:wl eep.0t zsho weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Ea70u zuq fho6h;rth where the acceleration due to gravity is 7u0h;q6h zfou $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the objecv3lwx4e .(xqo t on the surface of the Moon where the accxw q(3.oe4vx leleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on e;z 6eqlfor+k4t z +- vkx*d4iEarth, and object B weighs 40 N on the Moon. The Moon's gravity is onetzf+e-div 4x;qzr okk+ 6l4*e sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-o 4ktelkhhf7fz( +bt3kna)k6/ f-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls a kbf 6nthf3+(tk 7le4kzhk )/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 level frictionless surface. 1qgm(lr9i o dj;jtw2 - A force F acts on the stack, and it acceleratesojm r1w;-gtd2 q 9i(lj 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 the scale d )r8c vwa2xa7be drv w7a 2)c8xareading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of thej-a kzd;nog35lh7 b1w person is 60.0 kg a7 3l a j;khn1d-g5zwobnd the elevator accelerates 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 elevator. Ifr/7hd2h5aaq)y x z2x t the mass of the person is 60.0 kg and the elevator a/hz57 aqx yxtrhd) 22accelerates 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 magyo)mtj(an r i 1w21 pcf)v5bc-nitude of 8.0 N and is directed due north. Therfoac bi- ) n (m121jvtp5w)yc 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 held iniww4 h9-xmwo5 n(xhdq t 46r7c place by metal brackets that can exert a maximum horizontal fo-icn4r5t7h9dw 6q4wohx (mx wrce 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 ple9ooj pd:;5zaqj1m 48acw *yu ace by metal brackets that can exert a maximum horizontal forcema cequow*j:5z8pdoj;4 9y a 1 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 = 0.40 kg, whaikxx v39a/n2jmcy8**pd l,fz h)u:qht is thelz ih2qv8k)*c/* px9, uxa3m:fdy jnh magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shor7ebbh8ugq,6 wn in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Igruge67bhq8b, nore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth c,)0i u,jc gowhorizontal floor with a force of 100 N in a direg,,jc c0 owu)iction 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 .btwur 2c1+ zn4xsd gq1 8wmp- y2xtn/of books 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, what i-c1 dq412g2rw/ n+sb wnttpz 8yumxx.s the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as kus3p;+rf+j1s uvf7 u shown in Fig. 4-2. What are the tensions in thr+s v1fu;fs3p7u+uj ke ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what isvfrd+ e*my1esi5dq ,n0 d;,yl the mass of the traffic light+ni f0md s1,vryde;l, q5d*ey?

  Two boxes of masses m and 2m are in contact with each othy 3.blrp-d .g w4l0d z/cbv1bo3kc r+rer on a frictionless surface. (See Fig. 4-3.) Whrrdcldo 3-p3glz/4 .k by b+rcb.v1 0wat is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each 0 i1l juj z+zy2-ev0biother on a frictionless surface. (See Fig0z-1ujij+2 lbiz 0y ve. 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. g0pdc38 f8wn-i yabl 04-4.) If the forward force on the more massive box is F, what is the tension in the connectip ncba-0df0i 8gl83wy ng rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. m5:2 ozd te4na4-4.) If the forward force on the more massive box is F, what is the acceleration of the lozt2 5nm4e :daess massive box?

Two boxes are connected by a cord runn9v3nm4l(dn ug et/b2o: p,u axing over a pulley as shown in Fig. 4-5. Box pb9a4vnx:on l(e,3 ugt / dum2I 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 fricti*xtylzjtj qgm3(vf57g/ e0z tk +l7 -tons between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. W05*l/egvjmtkt zflj 77-+tq3x yz ( gthat 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 for fgot;jw) ;4jo plastic on wood are 0.50 and 0.4;j;o f 4wgtoj)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 surface in the +x direction. It slows and comzwv tk;n6)v 6ua*j9 kjy jrb2*4fmw a)es to a stop with a j2 wz n6*r64jtjwvk )k vyabfu 9*a)m;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 horizon;dv pxhp6 wv/o8vcf7vx )/l; ftal surface is pulled by a 5.0-N force. A 3.0-N friction forcv hwxlc/f) vp p;xfvv/o7d6;8 e retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg1lyrip3h0j.xuk* -jz 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 10 m/s. It slides h d2 3uv1yt4ao50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and t oa2t h34d1yuvhe ice?

  During the investigation of a traffic aco: ,zw.lbzq;bx 3cuf9cident, police find skid marks 90.0 m long. They determine the coeffizz,3;uoq.9: wblfxcb cient 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 anugk1u + x3anzzc )4df)d 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 ia g+kf)nuu 14)xzc 3zds 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 bd85tsx9w8h1ekwkyg0xoa r:7 etween the more massive box and the horizontal surface is smooth and the sur0x7d:o1 5gtk xs eywkawh98r 8face 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 between the boxes?

  An object is on a frictionless inclined plane. The plane is i4f9dkjtgp q)r(p,y 0u a )r0:0 exinddnclined at an angle of ))rp 0teu4 g dn p(0ia, d:fyxdq9rk0j$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makesr8f 1dtwak, y(rxw8(k 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 inclineh+c(u q,a (bb; rx*c5ux e;bcsd 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 smoo6g7olu 3w95;hw:stu, zpzo l tth 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 inclined plane, at a/u. z-59 zkao5ycrhb 5dkcs;v constant velocity of 6.0 m/srsk5co cv .5- z/5hay;k u9zdb.
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 d(-0kg + vnfysvown 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 uk;/ qk,ic6k m,myc5k 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 500 N along a rough surface. Thvv4qp2u 47 i -,cinjewe cable attached t4ev ,4jcv qp-u2nii7 wo 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 ftk yuxjza*w6( .x8/rh rom rest on a rough inclined plane tilted at an angleyjx6. a8*z(w t/x uhrk 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 inmo o*1etfe9+ kclined plane. The angle of incline is gradually incr*ee9o o+tkf1meased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?