Which of Newton's laws best explains why motorists should buckle-up? irjepa 97jarv 2z-dm t1.d.0w

  When you sit on a chair, the resultant force on y)n6+3xcn fk*4j bilntou is

  In the absence of an external force, a movinucg(i vagzbu;p /63( ut .t*nlg object will

  When the rocket engines ,s) h9hm3y3* wx pxa;mxad4 p*kaa4qd on the starship NO-PAIN-NO-GAIN are suddenly turned off, while travelimxmwdda33 4 a4kap* yx, 9;sah*x)qphng in empty space, the starship will

  A rocket moves throufbdr,umf y,f b9)-iy( gh empty space in a straight line with constant speed. It is far from the gravitfbr, m -b )fdyfi,9u(yational 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 moving bus, facing forwarh b w()xdc*ja.4wu v8bd, and you suddenly fall forward.jbhc8u*( )4wa bw.xvd You can imply from this that the bus's

  You are standing in a moving bus, 5:k c rc80ercf ryvn4yl*4o 4bfacing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force c480l 5n:ryycr ce4bcrv*k 4ofaused you to fall forward?

  A constant net force acts on an object. Deskq5e(( rx jfrn571iu k1en:js cribe the motion of the object.

  The acceleration of an object is inversely proportional tog7uue p0 j;fmim73rgc;6 3vpl

  A net force F acceleraterxf2n.ubt1w /qw vd(rm.7 3fs s a mass m with an acceleration a. If the same net force is aprbd7(vtwfnr .f2/s mux1.3wqplied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What s7-wn.rsphxqxlq+p- 0hx /5dacceleration results xpnx 0s wqshd-r+h /7xpq.l-5if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly aw hlsw6n6giji ** 3u; lam1cs1lay. This is an illustratija6lhw *cs1 *un 1l3l6 msgi;ion of

  Two cars collide head-on. At every moment during the collision, the magnitudc.1d: o(xng3gea * zpu2 bs7efe of the force the first ca:b 1(dfcopgas z.2uge3 x *7enr exerts on the second 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 object, the force which the objectx +ua :r1ks/zl exerts on you wilrx z1u:+lsa /kl

  Action-reaction forcesd k h/d5 +ngku.+3qkpz

  Action-reaction force: 0kq 0rly(tpapw c8pdxt0)k 8s are

  A 20-ton truck collides with a 1500-lb car and causes a lot ofql0i5s2xog fy: *1 lqp damage to the car. Since a lot of damage is doneigsxqoy :5p0 f2ql*1l on the car

  An object of mass m sits on a flat table. The Earth pulls on l rmdy5u a0mnji28 o7(this object with force mg, which we will call the action force. What is the reaction fo02muij l 8ar no5ym7(drce?

  A child's toy is suspended from the 1t p.qj:-vp pdz4ah 8qceiling 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," what is theq 8pzv- hap:j1 t.qd4p "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. The 9jy iwqrpdm1d2 g9m7h+l44kn ballgnr 7 y29lm4djwkhq9 1d+4pmi hits the bat with an instantaneous force, whose magnitude is

State Newton's three l6srsc + c3e2*jt6 l*njirdx3v 4hvc 5daws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Whic zj/7bny2cup ,6ef)yah of the following is true ab2 c/ey, pu6abynz)7jf out the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whf 1 iong3* qkeex*y8(i 2hpv4q p;bhcj68il :hich acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a p1q z)hzma.2/n9kwc rferson weighing 60z9kh)nw arz m.fq2 1c/0 N?

  A stone is thrown straight up. At the top of its path, the net force acti f ::o zhvi 8-dni+8l/vgug,gfxbb3 c0ng on fi:ig3+ovl 0zgvh-xn8, du:g / bc8bfit is

  A 20-N weight and a 5.0-N weight are dropped simultaneously fz)4 7kkb(zpmz0 dt 7 v0 sh*-muqmb6lzrom the same height. Ignore air resistance. Comk-)bb0zp7mvz mzk7( zsm*l 64 uthdq0pare their accelerations.

  A brick and a feather fall to the earth at their respective terminalw d:jlp1czy51gs y.3j velocities. Wc slpy5yzj. 3 wgd1:1jhich object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceilinko x d;0g9fea1k9 rvhm5a9,tf g of an elevator. The elevator is moving up at constant speed. What is the tension in xta;,akm od9hgv k90 fe1rf 95the string?

  An object of mass m is hanging by a string from 45) qjf (hjspothe ceiling of an elevator. The elevator is moving upward, but slowing down. What is the h5s4qoj(p)fj tension in the string?

  The force that keeps you fr;p sn* r81/nn/a wxuh0ag9jkoom sliding on an icy sidewalk is

  It's more difficult to start mov*9 ,kkx3 txcshanl(;b ing a heavy carton from rest than it is to keep pushing it with constant velocit lc,nkas;t(xhk x 93*by, because

  A horizontal force accelerates a box from rest 2mgv de ;t(4tgs0q/y d4kqbf5across a horizontal surface (friction is present) at a constant rfd0d ye qmg5sv;2 q(t4kgt/4bate. 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?

  A packing crate slides down an inclined ramp at constant vefw3xr* u/-ov:q en;bzlocity. Thus we can deduce thwn3u;:v -o/xb zq *ferat

  A block of mass M slides down a frictionless plane it*d:p.t tp)d snclined at an angle q with the horizontal. The normal reaction force exerted by the plane on thedt:dp).stp t* block is

  A block of mass M slides down a frictionless pf;77-w e drn 09 iig.bmt spz+4kabx8zlane inclined at an angle q with thxz8k79 dm bga74i.n+rtpz eif wsb;-0 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 inclined at an. 4o-fyr-ntl (kwg2 cb angle q with the horizontal. The gravitational force o ctrln (kyfg-w.b42- is directed

  Two toy cars (16 kg and 2.0 kg) are releaseq w,(gkit2vz1r0) fhid simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their ,h2(fw) gzikr q0t1ivacceleration after being released.

  An object sits on a frb jdrfqs4c+ rw ar+4xzz*23)nedu/3uictionless surface. A 16-N force is applied to the object, and it accele4es3 n4 uz3*addrrxc2+rjwbz f/q)u+ rates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from remg4x9hc( acfz (/ mrt-st to 27 m/s in 7.0 s. What is the average chmz( c-9g4/ fmraxt( forward force on the car?

  Starting from rest, a 4.0-kg body re5-f:c mgvkiu 1ewf /;gaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the bodykc-vm 1ifg/: w5e;f gu?

  An antitank weapon fires a 3.00n bw60qiusr+3 -kg rocket which acquires a speed of 50.0 m/s after traverubni 3q6w+s 0ling
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 forcem 5qd(a-nmmqepoqmd49 vmw9 *xe +;3pduti7/ that you push a 10-kg mass from rep qdu7 o m+w(e ma 5exvpd9*tmmq -m943/ni;dqst,

  What is the mass of a perrg6vzuan sw693/y w5w son who weighs 110 lb?

  What is the mass of an object that weighs 250 N on t x;u*quk5j2j*d;vrr w *rrb4r he surface of the Earth where the acceleratiork*r;*x ;*bq4w 5vjudrru r2jn 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 the1l5* :bncyee-;r oea,0n3amd;doi wc object on the surface of the Moon where the acceleration due to gravity is 3,0dbn olaa; - *encd:ceoy;e m i1wr5only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The f(:)si fatl ( zg0f9 eyc/1vgwMoon's gravity is one sixth of Earth's. Compare the masses of the obigl(ayz ec91(:fw)vft 0sf/ gjects.

  Sue and Sean are having a tug-of-war by pulling on opposinwd5*jbkkgyg41 tan1q d88y 8te ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's fo 8nkd8w *k4 1 tg1jy8qyn5dbgarce 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 oh;xhk,0e(ncn cu wri,pssbw-15g : a.n the stack, a u1hais (,.e:n0wbr 5;x-, hcpnsgwcknd 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 4.1 ;z6nkviq uowp)ml the scale be readinvik4zmw.1up l o q6;)ng when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevla -gx /w:lywc575y9p5 lm hmkator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration of gm5kx5lap 5wm:lclw /y 97 -hy$4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an a65a sis/7trtelevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an accele5as i7/ts6tra ration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kgbi.;q i;8 o/ajdh /rwz mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east .j; hza8rowb/qi /di;has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on thf 0d c5ho.)okce flatbed of a truck. It is held in place by metal brackets that can exert a maxim0.fck5doc oh) um 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 into the cab?

  An object of mass 6000 kg rxx. dn6 qf2e;sh2)fpiests 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 stoppx 2h i)efpn2.x6d;fqs ing 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, what ikx vw(srdom424.duv 5aj x 39cs the magnitude of the acceleration of the system? (Iwasd3x 4r 2vv4 xu9do.ck 5m(jgnore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig1 ,yfxeo1x4b b;uxq+b . 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignoroxyub;11 b 4x,fe bx+qe friction and the mass of the pulley.)

  A student pulls a box of books w5e y8sd/sx/s on a smooth horizontal floor with a force of 100 N in sys x8ws5d /e/a 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 oy 67rpbd,rlj: n 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 anjr:7,pr dyb l6d the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 3h rqr69l35kuz czq/cN is supported by two ropes as shown in Fig. 4-2. What are the tensions 59zq/ck 363hrcru lzq in the ropes?

  In Fig. 4-2, if the tensions in the ropes aree/ /eih6twvja :5k) gr y(sntz*we9p/ 50 N, what is the mass of the trafee(/5):yt/j6vie ha9p t/gnsz* wwrk fic light?

  Two boxes of masses m and 2m are in contact withxqu q4l/9+p uo each other on a frictionless surface. (See Fig. 4-3.) What is the acceleop 4l9quu+xq/ration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless sulxrz-: 7eds99l dp zp:swj 1tgcpx5 00rface. (See Fig. 4-3.) What j g:5sd0z:xs- t c9d7zl9pwr lp10epx is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a e( b4zic *(mguxn 7-asrope. (See Fig. 4-4.) If the forward force on the more massive iag-n*mzu 7cb es4x((box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by adh8hw.*mr bu5 rope. (See Fig. 4-4.) If the forward fo .h bmwh*r58udrce on the more massive 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 25xjz c6 1bsud(3vtrf in Fig. 4-5. Box sb5 txfu613z2dvrjc( 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 5qbf2(:rnf mtd -cy7u 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 fo mtc frbfy2:57u-qn(drce is applied to the box?

  The coefficients of static and kinetic frictions for plwoc6ma q,c82y1o7gu oastic on wood are 0.50 and mwqa,oy6 g17o2uoc 8c0.40,
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 +ko 5s/be ,xqod4ol uv1 )wd:aa level surface in the +x direction. It slows and comes to a stop with a constant acceleratis4lu/:5waqdok b, 1evod)x +oon 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 bygw nho.)5wz-.s5 gil b a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration osw5.onw z.g )h 5bgi-lf the object?

  A horizontal force of 5.0 N acr) iz lg+t((+5z fr:s:hk lsfjcelerates 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 an initial speed of 10 m/s. zl l r1gi:adwe0u:,( )sdv 6b.os 5xvdIt slides 50 m on the ice before it stops. What is the coefficient of kinetic friction betwe)wbl e: so ,r1iad(5z :xdlu0v6gd vs.en the puck and the ice?

  During the investigation of a traffic accident, police 5ubbsa l53dg0 find skid marks 90.0 m long. They determine the coefu30bds b5a gl5ficient 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 surface betwb1 bop -xr 7tf, cc+amgt/h4iv81uy)geen 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 fr1 4g 8gcyvbar -ot7,ux1pcb/mi)f +htiction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6 po7fw hlek+:2,dix r9.) The surface between the more massive box and the horizontal surface is smooth and the surfw2 peoifxk7r9d, +hl :ace 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 inclin;pkq7nh c*lby/, j(g ded plane. The plane is inclined at an angle of /hky(; gjd *7b,lqpcn $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hilp5 8 yk,9xsv 3ie4umwcl 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 y(gvp7s46t2s ,* mwvd g4eoa m1 alrvc8e(.tiangle 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 pla4tts;n 96jnnone 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 velx-0;uohomqk:h 5v- m 8mvi:y docity of 6.0 m0vm8om:yi o;-uqd-k v5hmxh :/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 hr6f5pn6 x/b kp69qnq 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 mass m slides down kc+c g*n ml0x(gcz/j (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 su: p1:x6zsd3wf9yy z;o fn bb7hv zn3,rrface. The cable attached to the log makes an angl7,fzyh1 9;nsp::6xo3bzbd3n wvz y fre 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 it6lj gb:mhe5rvhy grm4w0u 3 )4o4s*wf0c*jq nclined plane tilted at an anglee wlvmyor)03q urh0w5s6h m44* :jg fbtcjg*4 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 plane. The angyjam1f* s2xz 7yqb,p2 :vn()q h*bf sale of incline is gradually increased until the object begins to slid f*(xyb,nj*h:p2sa2f ) q1mqsby 7azve. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?