Which of Newton's laws b+hch7685n)siszi ff1x ; qqmqn*uzj( est explains why motorists should buckle-up?

  When you sit on a chair, the resultant forces-xi3u rgh.l1 on you is

  In the absence of an external force, a movingi(mhf ;qt13 cty) tb,y object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sudde2.v4twu 6 v(- tw zn4yi3prs1s)z qcgcnly turned off, while traveling in empty spac zsq)i .zs4gt2 p1n4-vw6(ycr wtu3v ce, the starship will

  A rocket moves through empty space in a strid* u n- h )u2t3ley;bkc76aotaight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to si -u* t)a 67lo;dtyubkn 23hecustain its motion is

  You are standing in a moving bus, facing forward, and you su ;uyg, f,sarb+ddenly fall forward. You can imply from this thatbs,,ur; +y gfa the bus's

  You are standing in a movx,2ji nn0dat6cgg 0 u1ing bus, facing forward, and you suddenly fall forward as the bus comes to an immediatenuni0g1 j,x2cg ad06 t stop. What force caused you to fall forward?

  A constant net force acts on an object. Describ)u7eyy z1 rlb8t:w3 vke the motion of the object.

  The acceleration of 54knlythu 50/ y. blo9ipbo6kan object is inversely proportional to

  A net force F accelerates a mass m with an acceleration wf(q4jh q0 o- fa:d7nda. If the same net force is applied to mass 2m, then the acce04w j:daq(ho-q7 fndfleration will be

  A net force F acts on a mass m anl k9i;z7si8mhjr, xa igm-o)ia, 0*lid produces an acceleration a. What acceleration results if a net force 2F acts on mass 4m9aim-,lki8xizir so hmij *0ga; l7),?

  If you blow up a balloon, and then release it, the ballo7 uuk a,-zsi-son will fly away. This is an ill z7skis, u--uaustration of

  Two cars collide head-on. At every moment during thwtqg9q0e596cn2o7 u rbeex q8 e 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 theeqt0q2cobq w69 ur57g xnee89 first. This is an example of

  If you exert a force F on an object, the force which the object exerts ohkao3ik 9- )pjn you wil 9apk-ki oh)j3l

  Action-reaction forc,brk 8i)1+rssrst hh/q c.0ai es

  Action-reaction forces a22tivav xi 2 (nyy(*gere

  A 20-ton truck collides with a 1500-lb car and causes ((tg bajj02 rhtm7jg tkiq 06j 1l07cwa lot of damage to the car. Since a lot of damaq2 (6jlittr0jag( mbwkg70 tc 0j1h7jge is done on the car

  An object of mass m sits on a flat table u;u.s9nexh) ,bzksl0y s3:jh . The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force?3u9;s,shnul .x) y b0jz :ekhs

  A child's toy is suspended from the ceiling by means of a zsadjimn.:8cfi+5b+kd x .x- string. The Earth pulls downwardnzkx miad+d8.b5.sif c-x: j+ on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. This;8u lt(x7is:6/ e 2tn1rhmhuint z; e ball hits the bat with an instantaneous force, whose magnitude iinsxien/sl8 uitu;t 7; h( h6: 2mztr1s

State Newton's three laws2r 9s fk85lpb8lzzwhn6uo6 * t.

  Mass and weight

  The acceleration due to gravity phoxt7rey y95m:qb0 .is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut e r :7 ht.qy509poxbymon the Moon's surface, compared to Earth?

  An example of a force which a,xk xeshmi+jmrdq6/2( a0 rt3 cts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person dwg.0p66,6u d tq awphweighing 600wg.pp wqd6d0t,a6 h 6u N?

  A stone is thrown straight up. At the top of itekm w./4jqn (os path, the net force acting on it /(em4on.kq jwis

  A 20-N weight and a 5.0-N wei0/3ea 7o)4jlf*ye2pyj)f n coiwp 4v vght are dropped simultaneously from the same height. p32)*j4/ofjiwp74vo0ay f yn)e cev lIgnore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respecti )8kva f7rb;bm uek1m:auv (n1ve terminal velocities. Whiv7e);mnfurb k kavm: ( ab18u1ch object experiences the greater force of air friction?

  An object of mass m is hanging by a strini8nnu/np 8d x,g from the ceiling of an elevator. The elevator is moving u up/x,in88dnn p at constant speed. What is the tension in the string?

  An object of mass m is hanging by a sv;d9ugpb. m1wjfvp 7 3tring from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension i.u mpv;bfdvw3pj9g 7 1n the string?

  The force that keeps you from sliding on vnzq-qf blr)2qs/7l/ay ) b if/b94x san icy sidewalk is

  It's more difficult to stn1zjn;no8 /.h i9p* rzdyzxj) x7jo 46atj.pyart moving a heavy carton from rest than it is to keep pushing zny6jo) 4.py7hxx8jnj* aptndz19r i;/. zoj it with constant velocity, because

  A horizontal force accelerates a box m4-6wf.g/mkx gh )p)b-vn f 00bmn* bm,btqvwfrom rest across a horizontal surface (friction isq-b. mm0 4b)w mvmkgw)p*fbf,/n 60-vb gh xtn 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?

  A packing crate slides down an inclined ramp at const x -2 vb6hx2ylc:iv*dxl;rdp*(yxjxr2cf n78ant velocity. Thus we can deduce tha2b xllxdnr72(c x iyjxpdx:-8*;2*hf6c yvrv t

  A block of mass M slides down a frictionless plane inclined at an angle q with6 d ) uf/tzs+q;u4)c hx9iiugck5u kv2 thecix;fd6u92/)h5 )+u q4itukvs zguc k horizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a fr)-46 )xoda obiwmu* dvu;b bs:ictionless plane inclined at an angle q with the horizontal. The normal reaction force exert dux*o- i wm;bsbo):6 vabud4)ed by the plane on the block is directed

  A block of mass M slides downwht11s*u9l5h8w wcs)u7 psey a frictionless plane inclined at an angle q with the horizontal. The gravitational force is dwscw s9 p)yhlh 15*su7t18uewirected

  Two toy cars (16 kg and 2.0 kg) are rs:8i( 7.rll ela,phu qeleased simultaneously on an inclined plane that makes an anglequ : 7shia,l(p8.ll re of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a fri0.ba2k x6bnu* a6 zj9tsb)fshctionless surface. A 16-N force is applied to the object, and it accelerates at n. 9bs6f2 u6ba0xjkz*shb a)t $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelera r)i+o:gfpshup7 j n/5te from rest to 27 m/s in 7.0 s. What is the avera7/r f u5npjh+ip s):ogge forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speg rr:;i encm//ed of 8.0 m/s in 2.0 s. What is the net force acting on the body? rr/mci :n/eg;

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s aisy 46x2zzd3j8mrt v (fter traveji mt42 sy(dvzx863zrling
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 mas6k g.bfqwnv 3dgi m q/p7)1q3es from res kw1bq/mgn7 d.pf g) vq63qi3et,

  What is the mass of a person who weighs 110 lj8*af w1 ak;vb zdw4;nbg9m k,b?

  What is the mass of an object that weighs 250 N on the surface ofnr5pss /0;8e3el xsd2iyl-0c . xv npm the Earth where ths3n .leppyer;0imsv l/n2s 8-d xcx50 e 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 u,cg-tpt e q w,1cobp4/*pu,la7v1jlobject on the surfp,-tvp,le1/7ct pg 4ju a1u c*wqobl, ace 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 +xrp oi) i9,ugq+xkb6weighs 40 N on the Moon. The Moon's gravity is oi +6,+qx9)b kuxigr opne sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war bzo-q y/o93ex;umi ,kfy pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accele 9kz/yx o3-euio ;f,mqrates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force Fdnp -q)zh6ww . acts on the stacqp.wwnhz 6)- dk, 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 stands on a scale in an elevator. What will the scalek-gfr-efydi(:vk .ud (+ lvb4 be reading when the elerdfkdg(i4.f(u+ k: e vy -vlb-vator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. u ccra5h/kf6j1 0rpz;.q pgm9wb3 n4pIf the mass of the person is 60.0 kg and the elevator accelerates downward with an accelerh rkbzp9cn 4.f13p a/m5rpu6cq;g0 wjation of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 kghk-s+*)xc6k;ojp8r 1 czx bec and the elevator accelerates up-j*xc8ox kc )zsrb6 +;h1kp ceward 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 force has a magnitude of 8.0 N t;nwcm g 9*/x.bq)y;9swuyt j and is directed d/tqbscjm wx . 9w t;g9;yyun)*ue north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. xsl+)f;eh o*wfq6i(d kjpc,/ 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 is no wf /(hs+;p,xijed)l*qf6 okct to slide forward into the cab?

  An object of mass 6000 kg resth*4q1 g jrwc8jrd,u3 ms on the flatbed of a truck. It is held in place by me*4 1qjjchwdr u 8rm3,gtal 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 forward into the cab?

  In the Atwood machine shown in Fig. 4-1:0eowamiivqd ll 34ccreva4s6:;5* g , if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frig5wa3la:c4;e:is 64m vec dl*vrqoi0 ction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0vi5m; ,;difw77ix y2 rrd v5dn.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of 7; v m,7 ;divn5idrwxrfid52ythe pulley.)

  A student pulls a box of books on a smooth hori(x ttyz0jiqsak; ).; ;z)joekzontal floor with a force of 100 N in ;ezsk.)tt qj(;j0ka ;ix)ozya 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 ndbt 1f9qfc* qld0yj9tf:n-6 of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass ofnf6t cdy-q f9d*t9nb1l0jq:f 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 efws x+(,g+jjea bj(. shown in Fig. 4-2. What are the tenf(g. je j+s(ajx b+w,esions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what 2w )cz nfm,hs3is the mass of the traffic ligf 2zs)mh3w, cnht?

  Two boxes of masses m and 2m are in contacx+ ;frp hnct 4rij3.d+8 crjl;t with each other on a frictionless surface. (See Fig. 4-3.) What is tnr.fjhj+4 ip;3c t lrxcr+;8dhe acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with erur-qe-rq z+ .jvx;qiw 8y01yach other on a frictionless surface. (See Fig. 4-3.) What is the net force on thvq; 0iewr+8x1zr qq-yr.y-j u e more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fign),0ah3 y) nskk(x ruu. 4-4.) If the forward force on the more massive box is F, kykn)a)3h ,0u (nrusx what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. k,-+tsf6nevqi8 tg b:4-4.) If the forwa,qgni e8b :kf+6st-tvrd force 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 z51(57ittwl aykpv 3 qas shown in Fig. 4-5. Bo kl1(ypaq5 ti tvw573zx 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-k e-jo0 v6tfkno78h0azg 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 toza78 60oehj0f ov-t kn the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.:k ui.c v8pdr250 and 0.40,ckv2r8 .ipud:
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.txaai j4:f,f4(izb pi: b1hoe in the +x direction. It slows and comes to a stop with a constant accelerzi(ff,p.jaii: 4h1xo4b b a:tation 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 5.2 ao ;37os .dkm 9khygu*+xwec0-N force. A 3.0-N friction force retards the motionkum*;c o dk.23eash xwyg7o 9+. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, (yhir ohsrhw.kf- ,3c n1w r(8at 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 gi idfxg 75rngr5 x:(3ac t;mcu/qeu2q; ven an initial speed of 10 m/s. It slides 50 m on the ice before it stops.u/tn2ecaix;f5 r5:gc;7ux (q gqmd 3 r What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90ixzi7r g8s2 *b.0 m long. They determine the co r* igbsi7z28xefficient 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. +i mniu .580l7lrdgbe z5 9-ev, ctivq4-6.) The surface between the more massive box and the horizonttnce,eq- z+b.g85 i vm 07lvdiul5i 9ral 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 stackede.wq:yv2hl n4. (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 coefficient of static e4qwlvy2.nh : friction between the boxes?

  An object is on a frim4*b4/ik (ukdq :zgx actionless inclined plane. The plane is inclined at an angle kg*(xqdk4 ai:z/mu4bof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat f*o fmfiy5 0l9hill 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 6w*t +x r0 fgg./ ycrwvcc4j8qangle 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;:nhngcn;:.r2k y8 cmbcm.s f 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 insze u yd,n* 6hi,6pql3clined plane, at a constant velocity of 6.0 mhuqn3,zy p eld*is,66 /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 srqwv/ykl4af 07c; -julides 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 mli:xhgpvkyk 3cl0b(2 l.b */p+4 sxep-fox .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 roug5+mhab. 5buwpzeevz *t/l -w2 h surface. The cable attached to th5v abbt u*wzwme pz+h-/.2el5e 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 plane tilted at an+edi a sn 0w,+gneey5h 6o6wr4 angle of ,ind6n wga hyewse+4o +650er$33.5^{\circ}$ 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 anglx yt4;1lq66mkiwq1w le of incline is gradually increased until the object begins to slide. The angle at which this x i;61mlw wqty14lk6qoccurs is q. What is the coefficient of static friction between the object and the plane?