Which of Newton's laws best explains why motorists shou/ u3ds 4 3uy ig0hzehzt)cqu.rh5cq 0xhb;)5bld buckle-up?

  When you sit on a chair, the t19.bhrl r 9wmresultant force on you is

  In the absence of an external force, a eiqa;9i bv).c+f ue 55ti6uz xmoving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sucdeko8+e(uxsyn5u*7 ddenly turned off, while traveling in empty space, the (eo7nxu5s uyc de8+*k starship will

  A rocket moves through 2i/ 8qwhmvf4h 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 foq2 mhiv48fh w/rce that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forwarn7i6xru. yt-o d, and you suddenly fall forward. You can imply from this that the bur.7x6y oint- us's

  You are standing in a movin4ev( kun t(m-eg bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forwa kv((u-n em4terd?

  A constant net force acts onv yh;e0vcbb :11wio s0 an object. Describe the motion of the object.

  The acceleration of an object is inversely proport5wa/ onsi4 ;ly+ynbb* ional to

  A net force F accelerates a mass m with an acceleratio t8eu*r )wzvdx3w-h .on a. If the same net force is applied to mass 2m, thew*)udho. zv8e 3-rxwtn the acceleration will be

  A net force F acts on a k s3z15vuv2 rrmass m and produces an acceleration a. What acceleration resultr2v su1rzk3v 5s if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thgud 5nkrz9 4-1n zq7xvwrs:8d8foqu;is is an illustr-kfo g7vx51usrwz8z8; ddn nq9 q4:ruation of

  Two cars collide head-on. At every moment during the coo ;sbb)w ha8v +;lm;rrllision, the magnitude of the force the first car exerts on the ml) ;s+whvb;r8;b aorsecond 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 *.:zewhz4i8mq 4q .d:kvz otlobject, the force which the object exerts on you wil8.iz e qzo4 4:*t:.khdqmvzlwl

  Action-reaction forcvkalsq(3f)r wqb 63)ww 6lqt, es

  Action-reaction forces arenm oh;,rwn rdww,)* .i

  A 20-ton truck collides with a 1500-lb car and causes a lot of damagew ln59li5gz7l7q ylw7 to the car. Since a lot of damage is done oy77w z w5nlll7qg9li5 n the car

  An object of mass m sits on a flat table. The Earth pulls ogl: b5bxwxi;fo 9lqe-a + co.;. 2xzgxn this object with force mg, which we will call the action force. What is thglzgo2;+w5: a-9el c. xqx.fxbxb;io e reaction force?

  A child's toy is suspended from the ckq(i a83 xbtcfk1tta60*gxba8 v6 .fceiling by means of a string. The Earth pulls downward on the toy kxa6t0fca (bb8t gfq c*3ik.6 t8v1axwith its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pfeluff:i 0.w+-jeh )jdjkp3f 5k c/m6 itched to you with a 1500-N instantaneous force. The ball hits the bat with dk hflkff .50wjmu: fe/-e +jjc 6)i3pan instantaneous force, whose magnitude is

State Newton's three lawt)h9g:;itpm jrx p.d(s.

  Mass and weight

  The acceleration due to gravity is lower onhc*ec3 -h7/eiujst /l the Moon than on Earth. Which of the following is true about the mass and weight/s/cj 7tih*l3uech- e of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distak.6 x5s*l,l9o uya rmynce is

  Who has a greater weight to mass ratio, a zpb(qy24d m.wperson weighing 400 N or a person weighing 6pqby. mw4d(z2 00 N?

  A stone is thrown straight up. At the top of ;hs/ t)2g:bmm u+d h(s8fq1*i k plyvsits path, the net force acting on /v;g*sld:sk i(bfp+21 8 t mhy hmqsu)it is

  A 20-N weight and a 5.0-N weight are dropped simu )+uq m80jedyrltaneously from the same height.e) qr+m0u dj8y Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocdj *69va+dza iities. Which object experiences *9j za+d6avidthe greater force of air friction?

  An object of mass m is hanging by a string from the ceil ,3pt z rh59o i+iahbie53n4yxing of an elevator. The elevator is moving up at constant speed. What5+ihi 5 b,hx 33t 4poaezyi9nr is the tension in the string?

  An object of mass m is hanging by a string from the ceilingqxmg/fa k 8(8z of an elevator. The elevator is moving uzm x a8gkf8q/(pward, but slowing down. What is the tension in the string?

  The force that keeps you from slid(hxv,jeb; .* wbj ip3iing on an icy sidewalk is

  It's more difficult ts6h14c q e-:jzksa9i io start moving a heavy carton from rest than it is to keep pushing it with constant velocisqze:ks ai 4- ih96cj1ty, because

  A horizontal force accelerates a box from rest across a horlx-6fnm1uiweu 9;iw)(yh 5p sizontal 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 u9l6mn 51f) ; yisex(i- puhwwhappens to the box's acceleration?

  A packing crate slides down an inclined chi ezgi;1uog-qi 4++ wk0-p gramp at constant velocity. Thus we can deduce tq ;wgip+uoeki-0g4- c g1zi+hhat

  A block of mass M slidqqxtw3bb8epl 4,gzg 8ct*z: 7ehdx 3 +es down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block ist7x,:lbp3* ec3z8etb 8 zwgqxgdh 4+q

  A block of mass M slides down a frictionless plane inclined atuhdglabuod6:( 7dj3 3 an angle q with the horizontal. The normal reaction force exerted by the plane on the block is directed d( :3guabu dho6dl73j

  A block of mass M slides down a frictionless plane inclineda89h1f nx.jlmh;gbi 0 at an angle q with the horizontal. The gr g91bhhn0lx8m;fa .i javitational force is directed

  Two toy cars (16 kg and 2.0 kgu xn7zjcv-+dop. h1p9 :l +-gp2(xygsp.nwe o ) are released simultaneously on an inclined plane that mg:nhx ev+ d 7sp- pxoyz.+.(upc j1wn9l-po2gakes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surfacl -epnbg1 -wu3e. A 16-N force is applied to the object, and it ng3u-bl-w 1p eaccelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass ouf6v65 2d con 1 gh 4pfmh:5rrwp)v4j1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is thf 6:vhcj rf2dmo45vowp5 phur 4g1)n6e average forward force on the car?

  Starting from rest, a 4.0-8n s5dg( pxdk+kg body reaches a speed of 8.0 m/s in 2.0 s. What is thdk8 (+p5sdngx e net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket whzuqs, q i;,w8df a52chich acquires a speed of 50.0 m/s after ,f2w aqz,d 8sqc;h5 iutraveling
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 tha :t 0*vuoyw(dcoz jh-,t you push a 10-kg mass from rest(yjw,- *:z oh0cuodtv,

  What is the mass of a person who2hl+z (w2m.sf4w cnf k weighs 110 lb?

  What is the mass of an object tv by(sotp 2a,*yzsl :3hat weighs 250 N on the surface of the Earth where the acceleration due to graab,y3 zss(o *v: 2ptlyvity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the ob u ).x4en0fim:gb2hx cject on the suf2xigmue c 0. x:b)hn4rface 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, and object B weighs 40 N ondm4lz5ip,zaufa cp 88o4 (: ty9zl-xp the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objects8p,-z44zlu oxy (5atid l p 9af:8zpmc.

  Sue and Sean are having a tug-of-war by pulling on ops9ugc,w jsh92, u+q kaposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is j,cg+29k,wsu hs uaq9Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts on 5p+/g g lh1lk 6mxmi-lthe stack, and it l 6lhimklg/gxm+1 p5-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 sctvm m,,oiz/- cale in an elevator. What will the scale be reading when the elevtic,o,- v/mmz ator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides ,cc7( aojd6 fau;uos6in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration ; 6 fjaucsau7doo6(,cof $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of t-z;ja5z4c s rphe person is 60.0 kg and the elevator accelerates upward with an acceleration of rj45;z sacp-z $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg kfi1x:ho8w 4amass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleratio4 i:whkfa 8x1on of the mass?

  An object of mass 6000 kg *lrl++6ceksc b/vs i -;thr f*rests 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 travelingcrsk cse6t/+v b i *h;f-*lrl+ 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 +.uo gjihot p 03ai/4don 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 time if the load is not to slide 4toijo/.+guad pi h03 forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.6x4ws( t7 r5l).u:/ m wkiujgtm0 kg and m = 0.40 kg, what is the magnitkmu5s (tmr.l)wg t74/x :uijwude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown im b 4u.jms8m0an Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the p40bmasj. 8umm ulley.)

  A student pulls a box of books o w3e.p:iy :wj-vl2zq on a smooth horizontal floor with a force of 100 N in a direction ofojqp:iw e3 yz l:-.2vw $37^{\circ}$ 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 foru b od.yq/y*b*ce 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 nor*. y/d qby*oubmal force on the box?

  A traffic light of weight 100xxoujkcl,)i84i4 x0l N is supported by two ropes as shown in Fig. 4-2. What are the tensiou4)x i8cx0 ixoj,4llk ns in the ropes?

  In Fig. 4-2, if the tjjptydp ns8ct24 x5fq:- o(mu,wu;8 densions in the ropes are 50 N, what is the mass of the traffic licjo t8fq m:xdst;(8u pdpw2,nuj 5-4y ght?

  Two boxes of masses m and 2m are in contact with each other ongimy/m. tuoxp , s 7n qi22(:(erm;iaumg:y6p a frictionless surface. (See Fig. 4-3.) What is thtm i7;/pmo pg x .syu2 gma2rnuii:e((my6,:qe acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with,bo oe3z .:vww each other on a frictionless surface. (See Fig. 4-3.) What is t 3owv:bwez .,ohe net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If th*ej* jlzx021(zwfkl fe forward force on the morlj0l1x(* f w*ezzfj2ke massive box is F, what is the tension in the connecting rope?

  Two boxes of masses x)l3 ,j 9f wqd n6p2fgqzusi/6m and 2m are connected by a rope. (See Fig. 4-4.) If the forward force fnf,j2dg93/s xwl z q66)uipq on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running ov wi. ( nd+zj1;ixz sczdgax64;er a pulley as shown in Fig. 4-5. Box Iad.1snjw ix+i4 z6d;c g ;(xzz 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 kinety06ekdu5 5adeic 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 wku5yd5a6 d0ee hen a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictiorm2h2)xig (of ns for plastic on wood are 0.50 and hx 2 ri(fg)mo20.40,
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 surfac z9.h -shrf1ut*jni m8 fa( c/jt5g8qoe in the +x direction. It slows and comes to a stop with a constant acce9f5gj .i-h(8*sf zh81um jortacn/tq leration 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 horizo*g.j7raxgl jr3 cl,acb)h:z *asi/o; ntal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleraaz3,i* a;rx 7): a *b.gjh/ocjrcllgs tion of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a revxky;rt+ * n1ate 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 speedqbv q q-:ktdc;a66tp ; of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient ofbd aqq 6qc;- v6t:kpt; kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 msx *5meb5 sns) long. They determine the coefficie)x*sbenm s5s5 nt 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 and 3m are stacked. (See Fig. 4-6.) The suthuup.73mw-ux4 d sm:pwc* g*v:b0i trface 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 slide on the more massive box, w bvdwp4x:cum0*. hwgisp:-* tm37 utuhat 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 becgzq+tl,uw *to/ )0-i wfw 0mltween 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 slide on the more massive box, what is w/w-c iu+gwl0t q*f)zlmo 0t,the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined at vj:2 j4s gsca:an angle :jss :jg4ca2v of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hhpl 9+wyd pc0/x z8t:cill that makes 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 inclined plane with an anglezz xz 5r:a:0i/igk. mjnka) 7v 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 94 wvaw :l;s b synnv4:l;wd:winclined 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 constant velocity ofz3n70rfb1*vfs f7w2 m .ydvsq 6.0 m/s.3rs7b 0 d2y*zvsmq17f fn.fwv
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 slidd-o ep*c:tz +ues 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+ ikan,1gebopt2c h)yr0g q4- 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. The cable at.y.17 d5a aeoed7w 3vh lk5rpstached t3. 1earlo7akey5s57. wv hpd do 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 from rest on a rough inclined pz4fms nqe4pkh x*.s** lane tilted at an angle o4kp*zsxh 4.m*ef*s qnf $33.5^{\circ}$ 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 ob gc*064dkxb fn an 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 co0bfk* g xdc4b6efficient of static friction between the object and the plane?