Which of Newton's laws best explains why motorists v./v4se6toyv 9lfp(t should buckle-up?

  When you sit on a chair, the resulta:5ll r5o.3ggzbfkm (yma1 b:p nt force on you is

  In the absence of an external force, a moving object wohg fix,9mp +g*8cpw .ill

  When the rocket engim3 ix)o:w/l bvn(3vlpnes on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship /x3:v)p(o3 lwmli bnvwill

  A rocket moves through empty space in a straight line witp 9;njc*ch9pqgu nt.:h constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force jngutphq:;9*cpc .n9 that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing fon xpg2m*lz1we +v0+upf pz(t5 rward, and you suddenly fall forward. You can imply fromvmzwn 1eup5z*( pt+lg0x f 2+p this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forward fe+zuw11y yp m-.z x-vas the bus comes to an immediate stop. Wh-xf uz.ewvy1zm 1-yp+ at force caused you to fall forward?

  A constant net force acts on an object. i52mj js7hpe+*rh . hdDescribe the motion of the object.

  The acceleration of an object is inversely pr4 vgkase8z27(e bgfr-oportional to

  A net force F accelerates a mass mh1iwbg.i3 08mrh6vbpt/ cks k f/3yy* with an acceleration a. If the same net force ivii/thb k /c.618wp0bk ryyfs*h3mg 3s applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Whmak,e5i:gonqfrh ; *z (n6,yvat acceleration resul i k:qymr,5n ;*n hofg6a(vze,ts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then relubnaa gj gr6) u l5drp2c;w -)5bt.(lmease it, the balloon will fly away. This i )255ga6 )cumpuljbanr w(-.t;rlgd bs an illustration of

  Two cars collide head-on. At every moment during the collision, the mohj bf) rc, nqsk ayv0j(5 1rj2g8fgpx z3f7,)agnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the s h80)5j2s,vcg1fjaf)nrfo7 gr,(zxp jky q3becond car exerts on the first. This is an example of

  If you exert a force F on an object, the force which the obj)n* swhbanm-q 7vt 3;wect exerts on you willnb ntsv;qhma*w 3w)-7

  Action-reaction forceq5ne +wf+gsh/0 j:zs-6 wdfvws

  Action-reaction forces aijvffb 2wr*d3m9op x 1u)za;* re

  A 20-ton truck collides with a 1500vzb sbv*ll*8dke; uku 3 9h;.s-lb car and causes a lot of damage to the car. Since a lot of damasbs u* v ;leh893 kl*.;vdukbzge is done on the car

  An object of mass m sits on a flatasnk)s7w1iyd(0s s (-g xzwq 5 table. The Earth pulls on this object with fq7nw s1s( isy)x-d 0(g5wakzsorce mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. Theygg. i,p1 c0qc Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force,"p.g1gci ,y 0qc what is the "reaction force"?

  Your bat hits the ball pitched to youvfmn+drk(ou;s2b294j pa nlbq90t l z7i0d , s with a 1500-N instantaneous force. The ball hits the bat with an instrjsd 0u(m9n;ldfzb2laqp0ki t9 42b, o+s 7nvantaneous force, whose magnitude is

State Newton's three laws.z8ypy0,+w byl

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of1d r iytch.,909 ktgf3-amr tj the following is true a,31-yt0 t9 h.grjfrak t9dicmbout the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distan+kl/z ucpj+e w4/ k:otce is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person x :18awrqgs8onjz95 d 5svn1zweighing 6n98s x dn8avgz:z5w11q5orj s 00 N?

  A stone is thrown straight up. At the top of its path, tsm++ n vvtkuic0t46 -qhe net force acting on it m0tnv t6ui+-4sqv c+kis

  A 20-N weight and a 5.0-N weight are dropped simultaneously from theqzl /(/do1ffnv5 pt9s same height. Ignore air resistance. Compzsd1pt / ffv95 q/onl(are their accelerations.

  A brick and a feather fall to the //pfxmrw 7 yf-t9nzf( earth at their respective terminal velocities. Wh9(pwfm/xr zff/ -tny 7ich object experiences the greater force of air friction?

  An object of mass m is hanging by a st;qnu8 jtdx;5rring from the ceiling of an elevator. The elevat;;xtr jqu5 nd8or is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a x (b:6s1sad+ioj rv),h9tcy6) e qygfstring from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the s6ytygj+bh1sxv)d,) f :(iq6r oa ce9tension in the string?

  The force that keeps you from sliding on an icy sidewalk is1 m3 e8wqbb0pen6vf 8j

  It's more difficult to start moving a heavy carton from rest than it is to keepkf 4p s2 e8a3kiv)m8ic pushing it w8)ef kiips v23m4cka 8ith constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface (iztb,qpt,8h q8 jzn:-,tlhw 3friction 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 acceleration,, zqqzlbnht- 8:h8 jwtp 3t,i?

  A packing crate slides down an inclined ramp at10roqb hl +hx) constant velocity. Thus we can deduce that10hrlo+ b xhq)

  A block of mass M slides down a f+e ,nn s8dqw6rrictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the q6nenw+,dr s8 block is

  A block of mass M slides down a frictionless planhtw1p lny2p 0lha8,x*3 jc 7zne inclined at an angle q with the horizontal. The normal reaction fo02 y, plt1n7xlcpjnh *azw 83hrce exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an g;2poq y .g0uaangle q with the horizontal. The gravitational force is gpua o.qy 20;gdirected

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined plan/xsgik lpksmku; c4d*iwb/d1l:79q1e that makes an angle of 30e with the horizontal. pc1x diw slidu 9/lbksg1mkq7k: 4/;*Make a statement which best describes their acceleration after being released.

  An object sits on a friction:jpxuq a v(lo2zzlwv3 /r/7awy- -g:oless surface. A 16-N force is applied to the object, andg:-w-wjrlv/quo 2 alyp z/v3z7 (x :oa it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 6t7qs /. abdh )pujsq1kg can accelerate from rest to 27 m/s in 7.0 s. What is the average foqtqb /j sp)7ash1du.6rward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.054ef. veb+v5c lp)ip v m/s in 2.0 s. What is the net force acting on ev p.cpvfb + 4elvi)55the body?

  An antitank weapon fires a 3.00-kg rocket wnn1 17p nt ybr.5/rvoihich acquires a speed of 50.0 m/s after t7i/nnb.pr 1 yn1 vort5raveling
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 6 rjlt+98qdp4 i gg+o)hon-xzmass from restoxh qtogj-zg6+p8)9l r+ndi4 ,

  What is the mass of a person who weighs jdgmlgg1 1 ).r*sbut2dzw gm1kk 2 :,9 tixue)110 lb?

  What is the mass of an object that weighs 250 N on the surfa(wbtfu0la 6g/ m.1eg ace of the Earth where the accelerationwlu tga /m0a(. f1gb6e due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. Whata.coat 9*c5u(i gl,gn9lt db* is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 al,.t gdniu9 a *ot*lccbg9( 5of that on the Earth?

  Object A weighs 40 N on Earth, and objl5e0m/m+scm rfy8oo/ q g:c ac mu.85zect B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth'8yz f8:ug+c ccm5aq// rm5mem0 os.los. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg roqo-kwf kt7h :o/j+; crpe. Sue pulls with a 15-N force. What is Sean's k crq/kf-+;:j7ohowt force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless su6m 6)-ioi pzjtnqk s95rface. A force F acts on the stack, mjq n 6i)9z kp6-5istoand 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 tht5 wnc:nlfsg;y,.re2e scale be reading when the elevator is accelerating downwl:ty e fc,s; w5nrng.2ard at $4.00 \; m/s^2$?

  A person on a scale ov,je b4o/ ;2jy ebd8undlu1 7rides in an elevator. If the mass of the person is 60.0 kg and nvobeyjjeu1 2u bod,74/d l8 ;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 el 7vpqo vn:a+22bvpg0d evator. If the mass of the person is 60.0 kg and the eleva b7 2v0p2gqnv:dpa+ov tor accelerates 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 fg ap5ux p2c.5yorce has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude o2y5xu. 5gpacp f 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbf0.qw8qcg(dh ed 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 iscf. d h(gqw08q not to slide forward into the cab?

  An object of mass 6000 kg rests on the fvsu2sn2ua3zxr 7 h(* tlatbed 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 misuxuz 3s2vr n7t *a2h(nimum 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, wz vdgbo2+ 8xs:(ygrmb ct6c77 hat is the magnitude of the acceleration of the system? (Ignore friction and the mb+ o rd8vz:x mcbcys (76tg7g2ass of the pulley.)

  In the Atwood machine shown in Fb,h8nsen0t4 c ig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore fricti0ct48 sebhn, non and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a forcm tkg7k8: uu5sdib +0k30tbyie of 100 N in a k5iyiubk0gkb :t 0ms7+ 38 dutdirection 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 (tax l u-+.tymbooks on a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of ytta(x+ - lum.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 supported by two ropes as shown in2e3rm:-kf6afbhxjt63 b sn +k Fig. 4-2. Whatfafh- mn+ s bkr23bx6:3kj te6 are the tensions in the ropes?

  In Fig. 4-2, if the d;m5.1t 5x5 cowhr /b:apks:n/ou hgxtensions in the ropes are 50 N, what is the mass of the traffi/:swn.ok:thxc a/ gu551xhrp b o;5dm c light?

  Two boxes of masses m and 2m are i oga+zqq8bqsv/uxluu 5 .1 (.jn contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive box?l xu bo qq58zja..1 +gqvuu(s/

  Two boxes of masses m and 2m are in contact withc or kr -ode 0wha9)-knx250wt each other on a frictionless surface. (See Fig. o50nwaedx9 o-ctr0 -h k) wk2r4-3.) 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 the 7d2ka(gk6z*kne4ea7 xy ;ef i forward force on t7ae7* akn6kd;y (fxgk4iez2 e he more massive box is 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-yiiaz3(d2j0 iur;hl the forward force on the more massz ;hri(0u i-ia 3yjdl2ive 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 in1 re 8mb4h /d:v)mqnmp Fig. 4-5. Boxnbhm:qre mvp)md814 / 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-kg box andhbcf aqw :8kf)riyt:-r dj6w*d/6y j;on 4ma) a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 Nf6r cj ydi ho:qnma-a 8w6 w;*jty)/rd:4)fkb horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0(q de-hzfz y)4;fal/b .50 and 0lb /-d)(qf aye4;fzzh .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 surfa ;v28w i qmav e60ujc;5hr;schkla 7z9ce in the +x direction. It slows and comes to a stop with a constant acceleration of aw;v h a;7j;ru28sm9z5vhic ql6 ce0k -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pullebqq3 *k,6l khd/;xxrd d by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the qdlrq* ,6/x 3;kkhbxdobject?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, fro;*ii 4avv/xls .sce;zzfk- f3m 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 k *0p7hwlt; brspeed of 10 m/s. It slides 50 m on the ice before it stops. What is thr;7t*b 0hlpwk e coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marud +nmu4m syae3,f+e ,ks 90.0 m long. They determine the coefficient of friction between t,ees m3ud+,n4y mu fa+he 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 and 3m are stac8qyr (dv d;oo;ked. (See Fig. 4-6.) The surface between the more massive box and the horizdr8d; voo ;y(qontal 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 stackedt*10f r (opbkvd7 ;cyd. (See Fig. 4-6.) The surface between t( b1dvtky7 r*p0cod ;fhe 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 between the boxes?

  An object is on a frictionless inclined plane. The plapwm) o5/9(plk xb0ebnp::.fe *erzn hne is inclined at an angle of 0fm :x9bb5wklop. :r)en e z*p/(phne$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angleam 8/5axo) y) oom9bhp 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 pla -ybb+3jgwn7v ne 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 sj,oqy;2. o8dljmbi0 g tz614jps7 xjtilted 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 constant velocity o4guw ch8k:1 yof 6.0 m/s.wh8kcgu4o1:y
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 an/x zi1hbj29n 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 rw /mmy/ +p( hll8x6fetough $37^{\circ}$ 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 y nflrz/+ xbz/nm0tw9ls;u0, along a rough surface. The cable attached to zb+z/mfnnxl, utw;0y9sl/r 0the 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 oplf b/ +* pwsqq8+qoo *suo(2rough inclined plane tilted at an angle of *bquwfqo2 o(/8q s+soolp +p*$33.5^{\circ}$ 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 anbeez 0a42j. mw3fdo9d inclined 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 coefficien.ee 02a4o3 bfdj 9wmzdt of static friction between the object and the plane?