Which of Newton's laws best explains why mo6rgwj9e b:w 5ctorists should buckle-up?

  When you sit on a chay+, 0f udyd(-b jrtmm4ir, the resultant force on you is

  In the absence of an external force,ew9:ug v*, znh 8sy1no a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenldo oy39djt)/ ;p8kxmpnjdza s3)m: . ,hh3knby turned off, while traveling in empty space, the starshi ,/htm)oh3kdy:8zo nj kdm.3b np)dx s 3p;aj9p will

  A rocket moves through empty space in a straightj9r o d+sm9p: z6f;ilq 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 mot;+fpz9is: 6jlr9qmd oion is

  You are standing in a moving buscc er9+wav9 n-, facing forward, and you suddenly fall forward. You can imply fro9 ec-v +9wrncam this that the bus's

  You are standing in a moving bus, facing forward, and you;nu-wh8 8 rd 5,dckkhy suddenly fall forward as the bus comes to an immediate stop. What force caused you to fadhcu ,5n8rk h;-8k wdyll forward?

  A constant net force acts on anv649o *etnswj*/ :h*upoij vr object. Describe the motion of the object.

  The acceleration of anu nfwr3z *ffuf; )7n*e object is inversely proportional to

  A net force F accelerated os,t.z(;01ucu zzzck2, rves a mass m with an acceleration a. If the same net force is applied to et,dk1;zuvzcszzo 0,(2 rc. u mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleroj:tzs / 1roozrv6wm 44yrqrsn3 9d //ation a. What acceleration results if a net force 2F acts on mass r/doz m3rrs4s :zqvjo1n yr 96o/w4/t4m?

  If you blow up a balloon, and then release it, the balloon will fly away. md:ex6cy5bwdf 9)kk* This is an illustration ofd*kw6k)ceb59m yxd:f

  Two cars collide head-on. At 9*vcca/oux 6 /cp m +ual.nu6levery moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnix/acl6a9*c+n /oup mcuul6 . vtude 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 object exerts on you ws*hm e/t:*k wvill*:w vsh*m kt/e

  Action-reaction forces+xsb)k/sdbt*

  Action-reaction forces ar x.jtlx(,)nfoui,y :g.ir gy8e

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage tk z)2a t ,p43jff8ltyhtxo3 lql9w9k(o the car. Si,ql28fk hz)9tp3k l(4wx fya9jto 3tlnce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Eartmxtqp7r gn q,w*(;j5 uh pulls on this object with force mg, which we will call the action force. What is the reac*m5qrg x, 7q(j ;tpwnution force?

  A child's toy is suspended from the ceiling by means of a st*qjhp60fnwl1 ,3xt;dbl *jzx ring. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," w1l*0qwx6t*xjb,3h;z l jfnpd hat is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous forceu,um/j16ghu. (zzpxp oy (kz9. The ball hits the bat with an instantaneous force, w xp6/ zpukjum,(9. (ogzyz1huhose magnitude is

State Newton's three uu*oc -+6xwki, d*gzylaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than onec,zfpa g16 7p Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surfpg ,7aez1 6cpface, compared to Earth?

  An example of a force which acts at a distance iolmbit b*l-- 2s

  Who has a greater weighth yx+d .s0obz0 to mass ratio, a person weighing 400 N or a person weighing 600 by+s x0h 0zd.oN?

  A stone is thrown straight uprpwo*+j v)* kzl 2*gqn7o;nri. At the top of its path, the net force acting on it ) lzvonr+nj i;2*kq** wpo rg7is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the samt7oycolnhd,*j- gsw:e0 s;ag-) u5ik c(6gace height. Ignore air resistance. Compare their acceag*o7gh uy:je c0k-s;6l ct )(g i,w5do ancs-lerations.

  A brick and a feather fall to the earth at their respective terminal velo,;z+ -o(n--3hbiienx xr lon nlv)*f fcities. Which objecn-xff* n- ;+, (l obrxnlve n3hiio-)zt experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. The )cz*. yd25.yjwuouvo elevator is moving up at constant speed. What is the tension in.*cd).yvuwz 5jyu o2o the string?

  An object of mass m is hanging by a string from the ceiling ofd3-v uc409iq8mum:ytcyo0*:qq tjer an elevator. The elevator is moving upward, byy0 u4q9q8m*tdqt jr0eu :3:cc miv -out slowing down. What is the tension in the string?

  The force that keeps you from slidwp a rmqglaee4u+)r* 48o; /jcing on an icy sidewalk is

  It's more difficult to start moving a c c8z*ow3 y tyjpa+(5uheavy carton from rest than it is to keep pushing it with constant velocit*c5 ju( 83oy y+tzpawcy, because

  A horizontal force accele )(:ve7l ve*twcm -smerates a box from rest across a horizontal surface (friction is present) at a constant rate. The expemem(:v) et v*-7c leswriment 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 an inclined ramp at constc0o f4d e*yku9ant velocity. Thus we can deduc4uk9ef*d y c0oe that

  A block of mass M slides down a frictionless pla(8ymv8hxc 0 kj*9jimfne inclined at an angle q with the horizontal. The normal reaction formm8j0 j*kc x8 h(9yfivce exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q with wzg : /bv(,mgtzz+bh1 the horizontal. z:,bgh mvb( /tw+zg1z The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictio q z7ru)h0pqy no:qe87mt+8rs nless plane inclined at an angle q with thphqt)0soz78y+8n: qru 7qrm ee horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simun j9b (zqusq/*c*iim, ltaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleratioqiu/qn(9zc*i , j ms*bn after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the objecyyh8-0wxy 7v gt, andvyyh07 w8-ygx 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 rest to 27 m/s in 7.0 s.uk /m+eyfz-p 9 What is the average forwa9myp /- ek+zufrd force on the car?

  Starting from rest, a 4.0-kg body reaches a g v, 9csj9qhf.speed of 8.0 m/s in 2.0 s. What is vc s.,9 hfgqj9the net force acting on the body?

  An antitank weapon fires a 3. 84ojpt -y(vnhs0u)xfo(kc .u 00-kg rocket which acquires a speed of 50.0 m/s after cyj u4(uot)nph-(ok 8.0fxvstraveling
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 that8wz9 vpq znj-(ia x3dn:i .,mm you push a 10-kg mass from res9( 8xi:iqd,n.vm zz-mp a j3wnt,

  What is the mass of a person who weigeel5x+ s ;n6tc8wekxl9z2. 3+qbtdl(fslhn8 hs 110 lb?

  What is the mass of an object that weighs 250 N on the surface ofds9vpl h,ukhrn+z6pl n-d8:2 the Earth where the acceleration due to gravity dvzshkp+r8n:6d h,ll 2n p-9u is $9.80 \; m/s^2$?

  An object has a mass d;hutqo; zf,t-d7y bu ) /xxk4of 60 kg on the Earth. What is the mass of the object on the surface of the Moon where the accelqtfdd/ -zo7uu4yh,;b xx tk; )eration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and g2 u-m+dq(mat)w hm el8q-8ngobject B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compe(8)m+8 --dmug wgq2lahnmq tare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-k8cuvik 1 bxr*2g rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue atb8ki1*c2 vurx $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A fov2.uvkvd q3:t rce F acts on the sta3u: k dvqt.2vvck, and 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 48uifk;t2t s;z.e+cb (b0 N stands on a scale in an elevator. What will the scale be reading when the elevator is acceleratis2bucf; i(b z.t; +ektng downward at $4.00 \; m/s^2$?

  A person on a scale riflc08iv vrz+6 des in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an accelera v0lz6+c8ivfrtion of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an eleva/cb cx0 opm-m/tor. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acce ox/-/p mbcmc0leration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces a/msri: y k;ks,ct on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitudery;ss ,m/ki k: of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests t4juo7v. h3bo695mg1nospp-sj.cn u 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 load is not to slide forward intoj jnt63mhuovs s9 45-1gpo ubo.cpn .7 the cab?

  An object of mass 600h 5:wx5xf(2 a -*crfv; jpdrem,rw4ac0 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 4wjhv5(r25 fp :xm-rxd c*weaarf; c,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 mjb6om, r28o f;dyzw(bd;rty5 = 0.40 kg, what is the magnitude of the accelerati tdrdy ojrm8bb( ; ,w2yo65zf;on of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg ok p-p sezou+g7160rkvlv*t ii8+5gswx v:9 gand m = 0.40 kg, what is the tension in the string? (Ignoreu0kpe7t *or-gp+vos89zg1i 5x6s :vkil gw+v friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a ,o;r ,wyd1aeo force of 100 N in a direction 1ywo ,ed, a;orof $37^{\circ}$ 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 a force of 100 uxnr*-oc7 -yv N in aox r7yv nu-*-c direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is m)uwerb.q0uq(tr p + 4supported by two ropes as shown in Fig. 4-2. What are the tensw4qq(p rtu u.b+e0)mrions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the/f m)vhs:t 4au mass of the traffic ligua4 mv/ft: s)hht?

  Two boxes of masses m and 2m are in contact with each other on a frso8y 55bd, eedictionless surface. (See Fig. 4-3.) What is the a 5o8 5ee,dsdybcceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each oth7-*l1u g zitpbb4eypk*;pl 9x.tj/g d2;jn f eer on a frictionless surface. (See Fig. jfxpgz;-7dnep*t*9 blp1ky4l2j e/ ;tbig .u4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (S8qx p(2lyt /xpee Fig. 4-4.) If the forward force on the more massive box x /pp8l2tyq(xis F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If thpzpn*rw0 uxq/pw dly t(7v., ,e forward force on the more massive box is F, what is the acceleration of the less masut*v dwnr(y,, pp0qp7/ wlx.zsive box?

Two boxes are connected by a cord running over a n+aj75t :v +zsktwy2vpulley as shown in Fig. 4-5. Box I of mass5w: t+jtvnk z+27aysv
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 c mas8k4 skp9iq e3(h3frictions 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 horizontal forss3983ha4ckeqip (m kce is applied to the box?

  The coefficients of qzjtym 9 tz1,-static and kinetic frictions for plastic on wood are 0.50 anqtz1yz jt m,-9d 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 the +x direction. It slows and comour)sc 6sbo8 u i.8kya rf154des to a k4b58 oarsofruy8 d)u1is c6. stop 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 as 4gcppr *ob9, horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motgrpo p9,b*4 csion. What is the acceleration of the object?

  A horizontal force of 5.0 N accel(j ;y-7u:rvxl2 ms1 bfymt:u uerates 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 a3- sdtxzbd9t 91jwe rs:t ;al7n initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic fris;-t 3bwra99d71 j :exl szdttction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks--f;q)ypjfr8 op gxs 6 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 conditions. Estip yq--o) p8jrxf ;s6fgmate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. 64a x -a dron5t ak2nfbu94oltb)9vi4 (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rougb9fb)al kxu6n v4 no 54t294atiadr- oh. 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 7:egamwg2 j3x between the more massm 2we 7j:ggx3aive 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 between the boxes?

  An object is on a frictionless ins 67y xzx-a9 7md;xrusclined plane. The plane is inclined at an anglxu76 syxsz ;r -79xmade of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an ang gx ,tdv.ow imd*c45ue41 jrhiqav3)4le of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smoot n52gekd 0x;jlh 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 angle of;m c 2s d4j1pbfn41meu $35^{\circ}$ 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, av9+.ws gyo8lzzwb4 os9ug1c8 t a constant velocity of 6.0 m/u8wgy vlo8owg91b 4c+z 9s.z ss.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass w hf65tyx+.ycwef+0 cm 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 slz vc);der5pl.buhdi 3j;t8df:8h e5jides 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 rel(qc,3hx5fbco +qn 5c-8smj ough surface. The cable attached to the log makes ans-5n xch cl eqm+c (8,f3oqj5b 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 frct0 bmhon 1r(zyfyx,nw n/j+ cf :.94irc 6mx;om rest on a rough inclined plane tilted at an angle nyyi;rm6xmtw z: nhbjrcx1o .9 0+c4 cf(fn,/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 wgb*w5e6vird ,uy- ya lau5tjc 1+f.;inclined plane. The angle of incline is gradually incred y;6buj55 lveiyww+1u-t.facrg*, aased 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?