Which of Newton's laws best explains why motorists should buckle-u10f vfpu x7 masa 36dyrb6/bd:a6n)ja p?

  When you sit on a chair, the im2ds135 mgg gresultant force on you is

  In the absence of an externalae7 iec zs/n,8 t8gz3az0j 1ie- jbhh- force, a moving object will

  When the rocket engines on the starship NO-ode,,8 roes4dPAIN-NO-GAIN are suddenly turned off, while traveling in empty space, thes8rd 4de,, eoo starship will

  A rocket moves through empty space in a straight line with85;ksyhz afw71k r4bj constant speed. It is far from the gravitational effect of any swkrhk 5j fb8sz; 4a7y1tar 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 forwzsx nm8lvl*xc ,(88ceard, and you suddenly fall forward. You can imply from this t8l8 zxvx,e lcmc (s*8nhat the bus's

  You are standing in a mov9+ zq (9mw2ey2rr5f3xcr ufciing bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force rrywzr9m ecf uiq+2(f3c2 5x9 caused you to fall forward?

  A constant net force acts on an object+;o 1 a ,jdsev f14*u5moese(9xbv tsb. Describe the motion of the object.

  The acceleration of an object is inversely proportiono:bc:mt8wf;)s wa9 4qe2 jzerlgxx*0 al to

  A net force F accelerates a mass m w9zn:38 -0ocav7sut:kyjbi *oh g)lc lith an acceleration a. If the same net force is app-*:iyl0stj vcgbkc o h)l3 oa n87u:9zlied to mass 2m, then the acceleration will be

  A net force F acts onsjau;bk l. gh6z+afy*5 cox3- a mass m and produces an acceleration a. What acceleration results if a net forcej+x* hgf-3blayc56au .zo ks ; 2F acts on mass 4m?

  If you blow up a ballo8z-wbu9.fynh 16x8 b yvaz xo*on, and then release it, the balloon will fly away. This is an illustratioobf 9 z nyb-xzx6hwy8v.u* 81an of

  Two cars collide head-on. Amx,ggi vfl*9jx :8y5e y4xr/bt 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 ci9:j ,8mr yfyl bx*v5g/e g4xxar exerts on the first. This is an example of

  If you exert a force Fbhay)(pw6 4yqswd6z5h5 lk) f on an object, the force which the object exerts on you wi6bw )h(y qd4zfhp56lk5ay)swll

  Action-reaction forces6zjn k4 6gz,n lpdt;.s e,wbcg aa899f

  Action-reaction forc/xd :0ok*mucv (90ny l* faclhes are

  A 20-ton truck collides with a 1g*j r,b*iv) jba/ cq nwq+qs(,500-lb car and causes a lot of damage to the car. Sig, rw+b v)(si*q abc/nq,* qjjnce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this gdl *uz+j;tk :object with force mg, which zu j:;t d*+klgwe will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a strxybvp+k6)sa8v4l9iy ing. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is vb py9+4i)svl8ky6 xathe "action force," what is the "reaction force"?

  Your bat hits the ball pitched to y1 mk,.bh v+4ugwgke0s rr pxumx 6z41,ou with a 1500-N instantaneous force. The ball hits the bat w6rge1m+hk0,4,usru .xm gxvk b 14 pzwith an instantaneous force, whose magnitude is

State Newton's three l3s8 -418lqlhfs*oj;t ir pbs raws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Eao7 i+ct(z0pncao:5js6h w)s n/q5 ofprth. Which of the following is true about the mass and weight of an astronaut on the Moon's surfacznt a )0(psosoci /qp55w76hon:jf+ce, compared to Earth?

  An example of a force which acts at( ej- 3zbx6 5bqtrd9yi a distance is

  Who has a greater weight to mass ratio, a person weig nvh3w ::tx7gphing 400 N or a person weighing 600 g :pwx37:hn vtN?

  A stone is thrown straight up. At the top of its path, 3bil+a5f8iq qq buk( u-)aw8fthe net force acting on -uk()i ba5q3liafbqf +q8wu8it is

  A 20-N weight and a 5.0-N weight are dropped 1o8yv d0u)go** zi/b rcz( xl.bymn-ksimultaneously from the same height. Ignore air reszi ox0mn8(cg/ d*by vy.klubr)-zo*1istance. Compare their accelerations.

  A brick and a feather fall to the earth at their rc+ 0,ssbh8h;z.vbv r 7xhrb-3g,uit xespective terminal velocities. Which;hr7 xgts3sz, 8x u, bvrh0bhi+.bc-v object experiences the greater force of air friction?

  An object of mass m is hangi+yu*ri,b;ef29bpa d4 n iq+a0be z2n jng by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the striqezu *2r0fb9 n yjnaii e2b4+ ap,+;bdng?

  An object of mass m mysn *io nuix0xo+m ca,-u103gemt+) is hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowi0c +,u mxuon*3 o1 asm+y iiexmng)t-0ng down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewalk 8je- 1pdb9 2gft+ab zeis

  It's more difficult to start moving a heavy carto6q( wv j2u 6l0mie/r;w9sqgkb n from rest than it is to keep pushing it with constanu2q0 qvkb(gw wlm9e6 ri6/ sj;t velocity, because

  A horizontal force accelerates a box from rest across a horizontal i) od1vfthu7) ya* n;xsurface (friction is present) at aht* xf oi;7vd)yu1n)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 b.eq2qx/ 2;2 t zmatdodown an inclined ramp at constant velocity. Thus we can dedum 2odq;/.ttexa qbz 22ce that

  A block of mass M slides down a frictionless plane inclined at an angle q with x.df l7z; pq(jthe horizontal. The normal reaz;pj .7l( xqfdction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at ancy,vwwsff9ex. k6 9ulm)s -f/ angle q with the horizontal. The norma-l/wu9vc m. fx6s 9)efykf,ws l reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an5c qyoj1ugc+8c4 5 vwu6a:gihnbj z*3 angle q with the horizontal. The gravitational forc8wnu 1y 5bc 4: jchcv6iuz3g*g5q o+aje is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an incline tzt9au.o1l 7vd plane that makes an angle of 30e with the horizontal. Make a statement which best describes tat 71.9 zoltvuheir acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is a(yefex.8 l3lapplied to the object, an(fe 8l yl.xae3d it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 h5:hpqx7vmds6287 wxl1zrn im/s in 7.0 s. What is the average forward force on the2: 8mr67d7ln qphs5hix wzxv1 car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Wk wqd9;9ft3u6y0ctfl*o:i mb hat is thft9q3f t ym l06c;:iowuk*9bd e net force acting on the body?

  An antitank weapon fires a 3 ls5nsx )vh*y,.00-kg rocket which acquires a speed of 50.0 m/s after traves 5,hxylns*v)ling
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-kgkyzm. w38wl:ghmw;b 3 mass from rem:y;b wlg8h .ww3kzm3 st,

  What is the mass of a person who weig p db+2wphd4pta5vd02xm o-c3hs 110 lb?

  What is the mass of an object that weighs 29og k-sl4f7cf xd6vu 450 N on the surface of the Earth where tcu d4glov9x7s- k46ff he acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What igi )qx- b8n wg:ld:y9ns the mass of the object on the surface of the Moonlwx)nndq8bi9g g:-y : 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 on the Mo dy:jaouy)(( aoer 50pon. The Moon's gravity is one sixth of Earth's. Compare the masses o( ajp( uor5 yodyea):0f the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg b yc8 va68 6qnayw7ob2rx l9r,rope. Sue pulls with a 1w67bv 6,yay8 xoqlrbc r2 na985-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 hopu8u .-i1.j iyhu fak p08t6acts on the stack, and it accelerj8k-u ufi8 .u.app1 6hto0 yhiates 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 elev x vdykchw-/;j(dr8 zk8b6/ctd ox ;;cator. What will the scale be reading when the elecdy(;obddz;/x6 tkxrv8 /w k cc-h8j; vator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 kizjg+n3zj/; c5: u+1vukr9bn e 1eqy og and the elevator accelerates downward with an acceleratg+ci;+ y19bvj ejq zkunn5zre/u 3:1oion 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 kg mdiy-m zn92d7 and the elevator acmn2mz9di y7 -dcelerates upward 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 h+do bbgk7gd4uhshxw3,j ,;v)n p,8kk as a magnitude of 8.0 N and is di u3owdsbp8k;4gx,)v dkkj ,h+7hb ,g nrected due 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. It w8 ng.gu- m2jahcu3d:is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Whe .ju83d -w2uhgmga :ncn 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 xu9-xa) hop( i8m/uns the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal forcp(x xanosh) mu-i9u8/e 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 = 0adhh 0* fc1 tlwyf*fplt0u902 .60 kg and m = 0.40 kg, what is t0ald f9uth1fhlt*0wpy c*0 f 2he magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg,-c( u+dq5nohnb c;l4ynm9m9)zo (bfm what is the tension in the string? (Ibfh o5(n 4yomdu 9+ cc-nznq);9 lm(mbgnore friction and the mass of the pulley.)

  A student pulls a box of booksixw ;0h7v.dbxvl yv:*( u s2orua 6+ae on a smooth horizontal floor with a force of 100 N in a direction of vx*;0x(u6 +uw:7v a hr ys2obd l.avei$37^{\circ}$ 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 smootkmp8zj8b h.u) t i7vq/2vh z7oh 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 pju mh/t)b87i hzvk8o72.vz qbooks is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is suppool;qefaa2t2 2rted by two ropes as shown in Fig. 4-2. What are the t2e a2t;ofq2la ensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes r4.a vu) lax;aare 50 N, what is the mass of the traffic lia. uv;laa)rx4ght?

  Two boxes of masses m and 2m are in co*t x8 *i2scbg)bw) rhuntact with each other on a frictionless surface. (See c2 8wb)x *hir) *ugbtsFig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each othecj ,kvibf0+8bk v/: v sapq04zr on a frictionless surface. (See Fig. 4-3.) What is the net force on the,v:0sjk fbkzi0v bap4 q/ c8v+ more massive box?

  Two boxes of masses m and 2m are connected bfevqt6nw ,0u2*m o6dty a rope. (See Fig. 4-4.) If the forwardtveqw dn6m0 t6u2fo*, force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a0p4 z nal2+a66skyxlewu7tmhs .t *z) rope. (See Fig. 4-4.) If the forward force on tlwa 0mzhx *tuss 62 6) l+zye7pan.k4the 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 in Fig. 4-jdbvdcx/i 63e j8j)i7 5. Box I of mas 7ebvcd6jd8ij/ i) x3js
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-kg box qpnq.( a t1 m07ui6nyaand a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force 6y7qpn it(m1q0n au.ais applied to the box?

  The coefficients of static and kinetic frictions for plasti:5vdbnahz+ 3l c on wood are 0.50 and v 35+hal:bzd n0.40,
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 o+6 8ehcrskl 0 jgk*sk1n7c-u+x direction. It slows and comes to a stop with a constkc1 o- c6 ehks*krgjn0ls7+8uant 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-Nh(w-f9.vuteh k6m 6ni force. A 3.0-N friction force retards the motionvnf6ihh9t.u-k w6 me(. What is the acceleration of the object?

  A horizontal force of 5.0 cgcs zy; f;*0:dzb0t 9 3lcyx lf4hm+zx)a1saN accelerates 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 ph;ta -gi92 wdvjl4t(m/s. It slides 50 m on the ice before it stops. What is the coefficientl- ;t t4p9gwd(2hva ij of kinetic friction between the puck and the ice?

  During the investigation of a 9,igdcd(p +ki0*oh js traffic accident, police 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 co+k ,ih ps0dcgj *(ido9nditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m v5 n+b-vhye x4are 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. Ifbv4e5vh x n-y+ 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 stacked. (See Fig. 4-6.)ckdf2g3c.sq - The surface between the more massive box and the horizontal surfac3scqc-kf2 gd .e 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 friction between the boxes?

  An object is on a frictionless ,6 rhvg7ib xjqn,3if *inclined plane. The plane is inclined at an anglivb 7 qhrf,g3nx, j6*ie of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an anglej *cbd t 76kp+sqe(n;v of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smoothlb*spo k mw35( inclined 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 smooth inclined pl 1hhfzd8z*.zpdu+:3xuf cpe9prdo 0( ane 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 incli .od +v1ilwvi/ned plane, at a constant velocity of 6.0 mv1/.iod+w liv/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 slides down a 8/qwsrs0sf tmfnb,rhc ;, 16t 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 a rougrzv0 kd bw+ x6nf8.gi)h $37^{\circ}$ 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 v6 ce6znp j)u1mzg9.kcable attached to the logcn66.1mzj epk ) uv9zg 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 ft0. f5 a82pq losp q/s6;pl1viv+xl yrrom rest on a rough inclined plane tilted at an angle of x8 q1;s+.i5 l/apyrl0qfp2lp6vsovt $33.5^{\circ}$ 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 inclinenu 8g3kp r(.xmd 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 coefficient of static frictionu(mp.rn8k3 gx between the object and the plane?