Which of Newton's laws best explains why motorists should b dbbh00/gh*l qh;mb)muckle-up?

  When you sit on a chair, the resultant mdc5lh j4gyfp lo+oy- d,11u ;force on you is

  In the absence of an external force, a moving objec6 bwi-kge et-x7.e e3nt will

  When the rocket engines on the starship NO-PAIN-NO-GAIp0wl il5opu2l/1c5x 5h e m2apN are suddenly turned off, while traveling in hppl5mlp c2uo1 0w2eila/5x 5empty space, the starship will

  A rocket moves through empty )o/o f+pc 8ixbspace in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be app8)bi/coo+ pxflied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward,)e - hyb:a5jxvui443iwyko3uer1) qi and you suddenly fall forward. xay1j q:uei)e5i bi)- 4yvkow 3hur34You can imply from this that the bus's

  You are standing in a moving bus, facing fv-a93 s94lzr2na :q/iw eif;:(oi j zyxyno3lorward, and you suddenly fall forward as the bus comes to an immediate stop. What forfalzasynw j-r( q9i:ne/izi 3 49 vy;:l3o 2oxce caused you to fall forward?

  A constant net force acts on an object. Describe the motieuk1kf-hr6g4( zw 5cv on of the object.

  The acceleration of an object is invvbhw o xv+l8.3ersely proportional to

  A net force F accelerates a mass m with an acceleration a. If thejpar+tckr8/yu fcr dnx )58 71 same net force is applied to mass 2m, then the acceleratio) c 8/uj7rfad1krprx8ntc+5y n will be

  A net force F acts on a mass m and produces an acceleration 16d xh d/cuzgqm y.u-5a. What acceleration results if a net for5dc-u g/q dh1 .xmz6yuce 2F acts on mass 4m?

  If you blow up a balloon, and then releastxvv,dl yws,y5) /9 rme it, the balloon will fly away. This is an illustrs ),y xyr59,tdv/wlmvation of

  Two cars collide head-on. (j cy-gp )/kkfkfx.sot /zt0; At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is fjgt-/z. ;fkpx0toyc)/sk (k an example of

  If you exert a force F on an object, the force which the object exerts on y8: nkw951o u u4fw s3kthyz w sr60elj.t0g*mjou wihw853 ejgy0j1mttk9rn 6uk0ou * zs .flw:w 4sll

  Action-reaction forcos**7 ojadg .t*sf5yres

  Action-reaction forc49fy:nupa +1e1dbjn ses are

  A 20-ton truck collides with a 1500-lb ct9 up1jbim af:( -q6ow d*fbc2ar and causes a lot of damage to the car. Since a lot of damag6j dut( a9f2ib1*-fqm b: wcope is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this ceafz/ 4n; 1csbp. a+8flx3ib (dx-rh object with force mg, which web.xinaxar e ;fhf-s+4pz(l138c / bcd will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a st.oqlt.oen s9t;qp- r4h-gv,w zs /+u rring. The Earth pulls downward on the toy with its weight force ofq owq.9 r + s/4,uohpg;. tnet-vrlzs- 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 15v g qrn9-fo7g/y*-i gvjp1a/c 00-N instantaneous force. The ball hits the bat with an instantaneous fjic*- ggpa-q/91 vyng/r of7 vorce, whose magnitude is

State Newton's three e)umli viucg60t/0 irv/e q71laws.

  Mass and weight

  The acceleration due to gravity is lower on t+s qt8u+wx1vvi l9uc +he Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the1 i +x8u9ucvs+tvlq+w Moon's surface, compared to Earth?

  An example of a force which acts at a dq8(ran1, w /af;xzyd;gbl q*6smrt8d istance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a8g0e+*,h (hhd) skt hroi3n(mtzm*kr person weighikshd+km(g0 hr i8htn*)e,z*3htm(r ong 600 N?

  A stone is thrown straight up. At the top of its path, the netz 5o5tx-in q lds pik3ng25.o4 force acting on gzdn4k5n s35p i -2tqi. 5xoloit is

  A 20-N weight and a kedac-/ i,6p1j)r -tk kmiub25.0-N weight are dropped simultaneously from the same height. 1e kk-id)bc,tm/p26- iu arjk Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to t1 wfmx+4+jhw;g:tz tkhe earth at their respective terminal velocities. Which object experiences the greater force of +zxw; mf+4 t whk:1tgjair friction?

  An object of mass m is hanging by a string f:0soy -6lo2tx ;ijr /lzduz t8rom the ceiling of an elevator. The elevator is moving uouj 2lty06 ts; zrlzi 8o:dx-/p at constant speed. What is the tension in the string?

  An object of mass m ike(+e mc db( 9t5pr4jz-sru* ns hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the c 5edu m*-spjt4e(nkz(9b r+rtension in the string?

  The force that keeps yoxn(hsud*,6 sz u from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rei md0d;q nrw.g4::mdtst than it is to keep pushing it witg wd 4ddirnt :0mm.:;qh constant velocity, because

  A horizontal force accelerates a box from rest across a horizon p/k nwqm6q3yy ,qj6+k1 d4nspnimx6 0tal 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 the bn +0k x41ymqsmp6k6 qdn/3,q6j wnipyox's acceleration?

  A packing crate slides down an inclined ramp at cok9d8r 0z kzy .v45apxanstant velocity. Thus we can deduce thak.58yvz9r 0za k p4xdat

  A block of mass M slides down a frictionless plane inclined at an angle q wl1hsjf-h3, v (w1yrh 6m4 taghith the horizo4,m(wfj-ahsvr1h36gthy l 1 h ntal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle-vt2d gz mfi,8even9 9 q with thgf9 -98eedinvzv,t2 m e horizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incli pb9 -j22hpb kg*k+kcsned at an angle q with the horizontal. The gravi9+ 2-spk*pk hgbj kb2ctational force is directed

  Two toy cars (16 kg and 2.0 kgon-ptr +k*u tok 4+vp mi(wty-5+(y bz) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a sm o+yz(( 4it- u-+p +t nrtpkw5ky*vobtatement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is a6a a nh* i2h 7f4gmd3uuokd0(spplied to the object, and it accelerates asaa 3do04gk67f*uh (u h nm2idt $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000vfd+ns0elucgx nq30cr 3( x/) *n)km x kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward forcemnkxv/ cu+q03 xc*nfes0rlg d) )3(xn on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/si*rxt) sosk51 in 2.0 s. What is the net force ao)txir s1k 5s*cting on the body?

  An antitank weapon fires a 3.00-kg rocket okyjoet0v;x ,u j6 g(8which acquires a speed of 50.0 m/s after traju ;egvt0x8ko(y 6o, jveling
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 masn -zp*gx a2ukwsvj(v ,th1dol5/q1 m7s from res 5t*-wj1vx,lv um pq(g1zan sk dh2/o7t,

  What is the mass of a person who weighs 110 l4s gf j5x ;rk4;o u2i44pbuwqssr4de0b?

  What is the mass of an object tha d j:9b5pawtdck1c /i,t weighs 250 N on the surface of the Earth wherej/9, i1ca5d tbk:dcpw the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object on q3ljl9uq 8w9dthe surface of the Moon where the acceleration due to gravity is only 1/6 of thqqd8ull 9wj3 9at on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Moz e t,755cnqy bzkm*6ulitbe5e)wx4*on's gravity is one se 4n x5 tkcuemb*y5)*q5tiezl6wb,7zixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends ovtqpxkzo + 4pw; :)s:nf a 5.0-kg rope. Sue pulls t wpozpqs)k;v xn+::4 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. A force F 1zrg 5g k.fj7gacts on the stack, anzfr 1j7 .gg5kgd 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+3xggb3t e;w 0rh fh4mands on a scale in an elevator. What will the scale be reading when the elevator is accelerating downe0hwx43g +mgbt;fr3h ward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If /iao6b1 ux9ql*/p0u mc byn/e the mass of the person is 60.0 kg and the 06u o/inbmya 1p /9*qcbx/ eluelevator 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 elevat0 ttm zw:f1s4y2szi . lbkq5j,or. If the mass of the person is 60.0 kg and the elevator accelerates upward with anlzkbtt2z 1mq 0w:f j 4ys5s,i. 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 haryko 8 udc6hsaz+)q5 5s2 v1zxs 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 thx6 51rz8u5oyh as+k)q2vdcs ze acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in plawxdfgwp3 xzn5g2n+ jw-1t4 y5ce by metal brackets that can exert a maximum horizontal force of 9000 N. Whenn 5ggyxt1-n +pj w4dxw2z53wf 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 heo(hhxg4 hr85rbc,)8 j9 dxfdw ld in place by metal brackets that can h, j drbrxg8(8hfd) co9whx45 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 forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg av f ee6:meo6. lbiq6*rb+xn 19ar :vtcnd m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction+:tem i :l1ro9q* bvxnf6vec.b ea66r and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 7 gj8xiq0(rzs.r1 idmkg and m = 0.40 kg, what is the tension in t7ji.z( rs80m ig1dxqrhe string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor -k g.j ; scjvp+1 0gcfps2bpw;jt59lgwith a force of 100 N in ajwk-fs;s290j g 1l ;p.5 cbgj vpc+tpg direction 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 z kr 3k8s.b/*vixwh7ron 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*7z.3b 8irxkvwrh /k s books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 174n .iks1wc-2uq olmv +b jw4w00 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the ropes?ucio m2 q.n-w7lv1kw 4sb4jw+

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the wdxs2 dka2 jy;q: t3qs:e)ds*mass of the traffic light 2*:dkse txqswj3q)d;y sda2: ?

  Two boxes of masses m and 2m arz8 o)ee, e9c. gdvcv()a.xczf e in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of th.og)vcz) cz x.a,9ev(8fe edce more massive box?

  Two boxes of masses m and 2m are in contact with each other o,il )t)d7/e kab+lp hfn a frictionless surface. (See Fig. 4-3.) What edlki+pt7)fl)/ ba,h is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4 cm ef5 ;f8b2hmr9:upe-4.) If the forwaf8h;bp cm:5 uf2e9merrd force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 28pk+vm*ty6n e nx ,,pem are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of t v p km+xn,6nt*pee,8yhe less massive box?

Two boxes are connected by,;43o j-ix/tgue quq x a cord running over a pulley as shown in Fig. 4-5. Box I q/34 jqo;git,xx -euu 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 fgrv mwr03i6 3krictions 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 applied tki33vw rr6gm0 o the box?

  The coefficients of static kg57jq sjf n5:+ ;fi jikeb.-zand kinetic frictions for plastic on wood are 0.50 and -e5k5biqfs; .+jz7g n fj:ikj0.40,
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 directisdxf5p-0 x2kqon. It slows and comes to a stop with a constant acceleratio-xqdf0spk2x5 n 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/lf:icjhz::3 w qon6q.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of to z:: 6hqc/ :lqjiwnf3he object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from pzmz*7p95:payj j (xtz- zuf7rest, 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 r u ro41 dk3jd(h /(fnbfh;zkk s44*gkspeed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic frictiz/ 1 4;(gnkkfhdud4okh*(rr43jbf skon between the puck and the ice?

  During the investigation of a traffic accident, polic:4upib ge3bp)e find skid marks 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. Estimate b 4bi:)p3pugethe speed of the car when the brakes were applied.

  Two boxes of masses m ankkp/ 8re7ahgovl uk(yiw4 /q;-ru:n0d 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 static f rn/;yh8ki7ulov4qkk pu-/w: r g0a(eriction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4+j)b gs;n+ dno2khs5*gbtj i1/uy ,ks-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the box*j2 ob5/dnt, y)k 1ih +g+buj ssnks;ges 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 inclined at an angro3ckh4v 4u te7sf jma8;b2-lle u7cv4 r8-4 3mhkjf toe2lsa;bof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an an8j l2ez14 nc kv2u2q,/wkp rxrgle 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 inclid m+:;my:pe:htrcy 6tned 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 sm,p98m, fgg3 6p mfiytmooth 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 constant velocity s81 an0 4dmnitof 6.0 nsmt4n8i ad10 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 mass m slidlj w9b /zx4xaua . a+ya8y/(tves 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 slirfz54u4l fm9jdes 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 506rbq 2r cu gzkk537qa,0 N along a rough surface. The cable attached to the log makes ang6q,b7 u5zkrq kra32c 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 wuzf7oy0 *si-0 si5gs from rest on a rough inclined plane tilted at an angle of5-iig zs *0o7y su0fws $33.5^{\circ}$ 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 plane. The ang9.k*sw8,p skj ij pq;rkfc/ 9any- y8kle 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 of pjs ykscw ;9jik/ -k,r9ayn p8.*kq8bject and the plane?