Which of Newton's laws best explains why motorists should fjr-rwsg*0z i5 p u+4hbuckle-up?

  When you sit on a chajp/b6*nuj+, 06khqze4 gwo 9b-rjsqu ir, the resultant force on you is

  In the absence of an external force, a moving object c,v,.wro3bd *(v8o6pefda cswill

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned orn4 x6wor39f vff, while traveling in empty space,xn934 wrfv6or the starship will

  A rocket moves through empty space in a straight line with cojtz8ga ah- q:,nstant speed. It is far from the g:jg8a-a,qt hzravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a movingm6ubescyck3ii0p(my jw)ntel..:i( a- 7 6pb bus, facing forward, and you suddenly fall forward. You can imply from thisca3ubb( cmn p y.p :iys.7jwmltieke 6()-0i6 that the bus's

  You are standing in a moving m 3 evjtzz yp.3-9fq5xbus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forwax 9- e3z3mz5jfvq. typrd?

  A constant net force acts on an object. Describe the motion of the ob xv*7 9zwfx4qh xb*8itject.

  The acceleration of an object is inversely proportionagiwn k;b8i lr)(ro 7:ll to

  A net force F accelerates a mass m wivec 6;j53ukz1 - 1b(yn ctialsth an acceleration a. If the same net forcei 6 t3-uka51y zv1bn;ejcc(ls is applied to mass 2m, then the acceleration will be

  A net force F acts on a mas9+(s:l;b6zbm ummd 0vktfa0s u, 5mfss m and produces an acceleration a. What acceleration results if a net force 2F kfmm ,vu+5 b0mzdf0s:9 (tulsb as;m6 acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thisg,vfn3 47n sher4o aau6e*i 60khfum +g xkp55 is an illustratioai u xn3 hff64 * 4pghgr07v,mno5suek+ake5 6n of

  Two cars collide head-on. At every moment i uhw5gy h2gj qr-m6hm5m-n gw:-2 rp8during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the mpm5rj -2qrnm g-w- 6hgg5h:uy wh28i magnitude 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 (ha :h4 hk9vzxaro7l,object exerts on you wi9rkx ,h74lhzvo( : haall

  Action-reaction forcdmqx7l .2e2et es

  Action-reaction forcehl,0 hjkld. 3zjec;(ds are

  A 20-ton truck collides with a 1500-lb car and causes a b ibp(n k/+4sxlot of damage to the car. Sinc b(xp/bksin4+e a lot of damage is done on the car

  An object of mass m sits on a flat table. The Edl( fd:1clx 3tarth pulls on this object with force mg, which we will call the acti(3fx :ld lcd1ton force. What is the reaction force?

  A child's toy is susx :-; zs t2a4daqqggr1pended from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what24 ;aadqg-r :sgt1qzx is the "reaction force"?

  Your bat hits the ball kcqtpl9 +)o- dpitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous fodpt)c okql9-+rce, whose magnitude is

State Newton's three la5oy dp1.u)yzu ws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. o6j 1dslsgqr;zgqmyjf/i c 7,2f7n34Which of the following is true about the mass and weigfq qd1 rgj/gij3cm;7s,on fl 4s26z 7yht of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a q8by*tz r)q3-ppo;kn distance is

  Who has a greater weight to mass ratio, a person weighing 400 N orngo bitfq68x db7-(x:v qa8 kg )u;8dp a person weighidxdvok ib8-)8q:g un8 gxq7 t6bap;f (ng 600 N?

  A stone is thrown straight up. At the top of its path, -9k ei 4 kzv..xht6qn l8fxtw6the net force acting on it q.tvfxzt6ie.6h kx9lnk w 84- is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same )w:q6olv9qlmv/ sr r5height. Ignore air resistqo m :5sqv6l/rlr)9 vwance. Compare their accelerations.

  A brick and a feather fallus y70cwjo,7 o xlvq +fs( ,bez;;uy9p to the earth at their respective terminal velocities. Which object experiences7obzl po9, uuf;cysvs; y ( q7jew+x,0 the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of9-h,pp h7,t9z fwxrr:ogxyx7 6jn- jv an elevator. The elevator is moving up at cr7 6w9v ypr9-gpjzft,7 jxxh :h-,o nxonstant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceilingb,wxwi,q lw( , of an elevator. The elevator is moving upward, but slowingixb,wlw ,( w,q down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewalk iswlfg7k pxxf8s 71o.u8s.-f tt

  It's more difficult to start moving a heavy carton /t.b duax; cp9xehw bd5nj:27 from rest than it is to keep pushing it with consta/ hbu2wjbc 75te;9xx.: ndpdant velocity, because

  A horizontal force aw5hp7xx 9+4lnf5 n1x*cc dykd ccelerates a box from 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 happens to fknwxd 5+ dl7xpc*49cxyn h15the box's acceleration?

  A packing crate slides down ag +9rc78l5cbrq/ 8)k bap sqswxc-ir:n inclined ramp at constant velocity. Thus we can dedus+kwr/c5q- 78)8lbca pr c 9xs qri:gbce that

  A block of mass M slides down a frictionless planks:ht +l0 2mhse inclined at an angle q with the horizontal. The normal reaction force exerted by tt02h + skhlms:he plane on the block is

  A block of mass M slides down a frictionless plane inclined at an anccr(1-h+yg 4lyn kui3 gle q with the horizontal. The normal reaction force exerted by the plane on u cnyk( -lr13chgy4+ithe block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q wity 4t/d0ubw-n tr 5tsf-5wjmkv/4; 0 w.helyd sh the horizdrt;0t5k/hsmud w5 fjw bt0lyve-- .4sy 4wn/ontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are0 u5jopjb+q, e released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their accelerq bjuop, 0+ej5ation after being released.

  An object sits on a frictionlessn-fc17,l :si hop:gn i7r9pvw surface. A 16-N force is applied to the object, and it accelerates at v:9nn7rc -pgf 7w,hp o sl1i:i$2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from c. e-rg)x3 +/( inbiibxd .jaorest to 27 m/s in 7.0 s. What is the average forward force on the car.b xcrb/d 3xg)io+.n-ejiia ( ?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What c4erc.oe /x*mis the net force acting on toc*xm ee4./cr he body?

  An antitank weapon fi1. p aq9yfm0 lw 68:dohd0ypdqwl/1tzres a 3.00-kg rocket which acquires a speed of 50.0 m/s afte8p d yllwy0 a0: 9qpt1 mwdhz6d/qo.1fr 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 thato6.vbf -1eaonl1; zld you push a 10-kg mass from rest,b azoe;.l1on dvf-1l6

  What is the mass of adecto)pvbb(qi p 5.,9 ncep8dtx 22r6 person who weighs 110 lb?

  What is the mass of an object thaxn vb84xqg1s i -1.qwwt weighs 250 N on the surface of the Earth where the acceleration due to -wgqbq48x1. x wsvn1i gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is tfo15.juv(nm88 e kun( vr -rnshe mass of the object on the surface of the Moon where the acceleration due to g-ekv (nj( nmfu r8r.u 58so1vnravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object 4z.vo otx4zm2 B weighs 40 N on the Moon. The Moon's gz4. xvz2oto4mravity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are havij2uj zrmz ud0-*cud(-b,rc7z ng a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 1r,0r cm-jbu(jud 7dcz*- zz u25-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. A 7(bpk ,xs m*lfforce F acts on the sta f*m7,ks(pblx ck, 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 480 N st*f w dip w42meay f(u80;5uxeeands on a scale in an elevator. What will the scale be reading when the elevator is accelerating awe *u(fd;pi28 5x4f e0wmyuedownward at $4.00 \; m/s^2$?

  A person on a scale rides c ( lselox4p60in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an accelerase 0p6xl 4lc(otion of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the masl*whs4f( kukke 8( v4us of the person is 60.0 kg and the elevator accelerates upward with an acceleratik wu4 4k *u(e8lkhs(fvon of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a (pj06/hvvyh0m 1c h 9/i-e7e n oousjb5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acj onbi/ v yu0-c1/hee09 hoh76(vmsjpceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in plxk27y5e uke:4 p r3cgdace 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 x:kp 5ry2ee7k gdu43cif the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It ise*p s 67, nzq-0dpfreq held in place by metal brackets that can exert a maximum horizontal force of 9000 N.peqz70q d ,pnr6f -*se 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 Mvy ,l;;hifc4w = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore fricti, 4w vfhcl;;iyon and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 1wztoop no-; w,p9 :qv0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignorevn ; ,q-tw p1o:o9wpoz friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor wi d 5bcshd4vbcl4o(hc5 (;alp+th a force of 100 N in a directibdovhc(5l (5a4h;4 lpbcd+ s con 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 .om)8rpnuiqa8why1vyisl.)p+ bt . :smooth horizontal floor with a force of 100 N in a direction of 37.0e h q)+uwb8s.8y1m i iva.np tor)y:l.pabove 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 100ezhr td e9www;.x0, s yn:r1j* N is supported by two ropes as shown in Fig. 4-2. W 1n;*,j zewwert9h0:xywd.rshat are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is t8 r nmfg8hojh:9m-(efhe mass of the traffic ohmhf88r(g nj :e9f- mlight?

  Two boxes of masses m and 2m are in contact with each other on a frictioned -s 1fp0zn4/ ru:+cczd4 r*whij *mdless surface. (See Fig. 4-3.) What is the acceleration ofd*4n:rj4dc -p+wiezrd ucz m1/h* 0sf the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictvof:2j-;)r .w3wfad c:knkl p ionless surface. (See Fig. 4-3.) W 3or2 ;kwaw:kvj-.:dcfpn lf)hat is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by aj.5 2ngpxfws6 rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting jnw xp.s26fg 5rope?

  Two boxes of masses m and 2m are connected by a ropepm9bo2cteam+k z : ,(y. (See Fig. 4-4.) If the forward force on the more massiv+t9: (kp 2y,ceaobmmze box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley 7)mvqpc-+k mp400gnsr2ui mc as shown in Fig. 4-5. Box I of m+ 0mkipm-n4 vc curpmq)s70g2ass
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 st:9cyp* z oc4mgatic and kinetic 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 horizontal force is applgmz49:ypc *coied to the box?

  The coefficients of static and kinetic hc): r7t+zd:q dlh o)e ug 4(*ydccm7xyw 2x1gfrictions for plastic on wood are 0.50 and 07hmcq) cg1*::dld u2t7x w) x4oc+ze drhgyy (.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 dlyc, +uu3evy:m 9s bec3;a z7qirection. It slows and comes to as;uu 3l,mae+ccyvz q9e73y :b 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 a horizontal surface is pulled by a 5.0-N fk j nci)+*3pu (hr1q12kyq0 aegxwg8o orce. A 3.0-N friction force retards the motion. Who)3qh c8ra pgy(j2x0 eq1*nku+wigk 1at is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, -j8jif ug1g5 tfrom 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 slzkfue1)n8 ph/z lf5x)ides 50 m on the ice before it stops. What isu1 hp)8exzkn /f lfz5) the coefficient of kinetic friction between the puck and the ice?

  During the investigation of ahd,bs ( jd.hnn+-uqa5 traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between hnusnb d q+(,5h .-djathe 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 s:c 7 ptsnme4p.m lb9y1q/)vvFig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and1qvp7s9bm4/tmspy.l:e c ) n v 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 mm) x7s7jxga:b and 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 is rough. If the less massive box does not slide on the more massive box, what is the coefficb:a7s )x7xjgm ient of static friction between the boxes?

  An object is on a frictionless inclined +g8rq 1m g doyq (904bqvweb+wplane. The plane is inclined at an angle of o (b0m++y q grgw 8qwb1ev9dq4$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides d4 ,hszyhzlwm r1-lkcf77 3qb4 own a flat hill 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 wi mm73u61 evy0k r1tebe-iow/ith 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 tilypxb*bn7hdf q4e9r59 :,o,, awsj d vrted 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 u2p*6g oup-1f ug1zkf ytpkmmvm ;p**- f+(dza constant velocity of 6mo-1*f zum(pyuz d2g*g pmkpv* 1u;f- +pkft6.0 m/s.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mashhyrd/ / -v.-siof j 3.q: /elf8bhibus m 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 masso1 ss3l i0w)bv6z, 26gzuesc o 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 weigh t-z:nmcn+c v nk66q4ding 500 N along a rough surface. The cable attached to the log makes an angl+ncc46mqnk- nt6:dvze 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 plane tiltedupa76 ekrczp7higzw8( (+op 4 at an angle heu pokc8+ z(7ppia76(w4rgz 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 inclined plzmgd hhyfa+ v ,8.3ip3ane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object azmpifda+.,y h3 g3h8vnd the plane?