Which of Newton's laws best explains whp8:gb- zkzth)h lh8 fg)zge5:;klac,y motorists should buckle-up?

  When you sit on a chair, the resultant force on yoog96hfh ,.6(l 5r7u-t qnsg wxovbd-lv/, ffiu is

  In the absence of an exte eyl9qit/, +asrnal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN arex12 af;c xequ: suddenly turned off, while trave2:a1e uxxfc q;ling in empty space, the starship will

  A rocket moves through empty space in a straight line with conspa* z57m *7t8 wap,ev ycr(sjjtant speed. It is far from the gravitational effect of any star or plaw,j z7 e pap78*m(rjct*v5 ysanet. 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, fazjf -c43y dl;gcing forward, and you suddenly fall forward. -cfg z4l3d;yj You can imply from this that the bus's

  You are standing in a mov0 tz8mbg))y7 daxh) aping bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fah mp a)7y) zx80gbd)tall forward?

  A constant net force acts on an object. Desc5/ci9*-jqfcjz:e,/s eh3gg n cl d8ruribe the motion of the object.

  The acceleration of an object is inversely proportio- p3ma xmfaffy,a )k4.nal to

  A net force F accelera8roq 1ww bu0pw )d5)oltes a mass m with an acceleration a. If the same net force is applied to mass uqdp1bwro)wl ow) 0582m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Wha- 3efs ,agvvj9 dpv8*ot acceleration results if a net force 2F acg*,v3s9va8 jdeofpv -ts on mass 4m?

  If you blow up a balloon, and then release it, the bnmw*adty2on v/-f4 4ialloon will fly away. This is an illustration mn4/ vn2-i4afd wt*o yof

  Two cars collide head-on1:3e c:r fbbga. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the 3re bagf ::b1cmagnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F o-)m 9yxl9h4z4yo0i mmf6jsvpn an object, the force which the object exerts on you will9-6mvlo mmx9yp4h4 zj y)f si0

  Action-reaction forcesewi-4;lwhd p6tq 5x rv7v6v0 )ih ndq1

  Action-reaction forces0l sgn)s6 zx-xk6,h ps are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damageag73bwtgrz w.2 :x*ox to the car. Since a lot of damar7*awtw xgb :zo. g23xge is done on the car

  An object of mass m sits on a flat table. The Earth 554bgx; jrpx3lrh n7 ppulls on this object with force mg, which we will call the action force. What is the4 7 hp;bxn5xrjg3r5lp reaction force?

  A child's toy is suspended from the ceiling by means of a string.,rtdk,np0 jsgjxvmu2 3)e+r9 The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," 2d3ktv0,u ej prgr)jms,nx+ 9what is the "reaction force"?

  Your bat hits the ball pitched to you with ze; zhwk 6)z+7c u.gjla 1500-N instantaneous force. The ball hits the bat with an inszuc7;hgz).6 we+z lkjtantaneous force, whose magnitude is

State Newton's three (+jwuie 68jz6j u tht4laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which ofht*8va +fm ,+rqh q3eb the following is true about the mass and weight of an astronaut on + h,q8 rmeh 3qbfv*at+the Moon's surface, compared to Earth?

  An example of a force which acts at ;342 orzgm/ vl8zzrd xa distance is

  Who has a greater wez6b6y piymp5uhd 0y0 gl1 6dc4ight to mass ratio, a person weighing 400 N or a person weighim6cdliy 5hb6z yd00yu 4g 61ppng 600 N?

  A stone is thrown straight up. At the tofo3di ,g z3 -:l y.y-tczx/ohpp of its path, the net force acting on it isy,od-g: lzo-yi3th fcp .z/ 3x

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the samebsmms: wvd.:; height. Ignore air resistance. s .:; mmd:vwbs Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminaxqkldc1shx 6 3,0.wcgl velocities. Which object experiencelx.,1gs 6qc wk 3chdx0s the greater force of air friction?

  An object of mass m 4k4dgtjpe5bm2 nf l dj 6kdv8s 1(.-dfis hanging by a string from the ceiling of an elevator. The eleva5(n vl g2jd- skpmj6bddtkfe 48f41.dtor is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an ejc i7:dhhut 3emv 2 5*yf90zgulevator. The elevator is mov9jztghf : 2h vd57u30ceum*iy ing upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding ge ,y14kmmv(lon an icy sidewalk is

  It's more difficult to start moving a heavy carton from n7nu .dsup ;o:rest than it is to keep pushing i .nsp:;ud7unot with constant velocity, because

  A horizontal force accelerates a box from re wyy+scu(iv *(st 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 th+(uvi(yy *scwe box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus uc6 eg) h(q2i5abikg7/ 7hnjtwe can deduceqeg5b 7kh62( /ta u nichi7)jg that

  A block of mass M slides down a frictionless plm p ej7kl v5hqch:(e)w0rj 8)xane inclined at an angle q with the horizontal. The normal reaction force exe)c km7xe p 8jhvjrqh) 05ew:(lrted by the plane on the block is

  A block of mass M slides dops137f.9 xu jvq 5npffwn a frictionless plane inclined at an angle q with the horizofupfpf j3s9 57 q1.xvnntal. 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 angle q with s6uh ojh+i04 nthe horizontal. The gravitational force is directed+4j6siuhh o n0

  Two toy cars (16 kg and 2.0 kg) are released s3y; jfy5 yrr02riddg56 ow2ts imultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being re5i0yr2f;g 6yods 5yw dtjrr23leased.

  An object sits on a frictionless surface. A 16-N force is (03eunsg; fwvapplied to the object, and it accelerate3uvefgw0; n(ss 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 m/s in 7.0 s. What oiw;ju() 8bdhis thhw(bj); id u8oe average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s irph. vv 8 s1-s+kn*x*6nfnkuxn 2.0 s. What is thkpx+ * sv vnr16u-nnk*hs.xf8e net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which azn 6l2z;9yxnmcquires a speed of 50.0 m/s after t2 9mx n6nylzz;raveling
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 withrc1414+ vdn ctsj9 fjap-xgr0 ;wr)u l the same force that you push a 10-kg mass from rest91n4rgxft w)r+jr sj1a p-vu c;lcd40,

  What is the mass of a person who weiggyx,,ui mh123.)txa vd2cq/ d( mwsji hs 110 lb?

  What is the mass of d6yvg6lg yyoc k4.7,lan object that weighs 250 N on the surface of the Earth where the ac66ldgycgylk 7,vyo4.celeration 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 wxf8vynn1i+ jz2.d(rthe suri.r nzdn j+wf 81(xv2yface 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,1g:+.h ovz k2:qajibq and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the kba.o+:z i2h:gqjqv1 masses of the objects.

  Sue and Sean are having a tug-of-war b3)lg/d kjf0u1u 8hg1txdytt m3j;,hoy pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N juxgy,mkg o;hjttdu1/1lt8 )3 hdf 03force. 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 surfacnhurc + *ac81 g(g:rm9sopq-qqd. tu3e. A force F acts on the stack, and it accelerates at 9qcn1t *:cruq8u(r h mgsqodg .3p +-a$3.0 \; m/s^2$. 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 4j feo6*j a:dgzp,i-welevator. What will the scale be reading when the elevat6, da:wp*giojz-e 4f jor is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of gla*hv sd)q zg(4;k -xp3wk4xthe person is 60.0 kg and the elevax- (dw)kz glhqv g3;* xaps44ktor 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 elevat xfgcm/nt w51)or. If the mass of the person is 60.0 kg and the elevator acce5n/)xcfwg m1 tlerates 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 foq0yl dad- (jo+rce 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 acceleration of the masso+(-al 0yqjdd ?

  An object of mass 6000 kg rests on the flatbed of a truck. It a;/2y0e wamk ,cddv* mis held in place by metal brackets that can exert a maximum horizontal force of 9a*wa y/dcde,kvm 2m;0000 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 rests on t38pwfs6m8 sexdm 6gb3he flatbed of a truck. It is held in place by metal8mswsx3em3pf6 6d bg8 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, if M = 0.60 kg and m = 0.40 k -yb/(gwafd7xj)j3mpg, what is the magnitude of the acceleration of th) - xgb(yap/wdf37jmj e 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 k nvj4v*ertgz)t3d 73a -lbw0e g, what is the tension in the string? (Ignore friction and tz3v 3l*7ebte a-vr j0dgt)nw4he mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor wirw b 8s g//imwi;o2b4eth a force of 100 / w28m4 sib/i ;wogbreN in 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 on a smooth horizos;cr2f dsi9bwcy: +m10t s wu f)bd54intal floor with a force of 100 N in a94iytsddf1 w)2+ i mbwr;sub:0cs5 cf direction of 37.0e above 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 100 N is supported by twogn,uw8hpa.-e uv5* 7x e(k ijo ropes as shown in Fig. 4-2. What are the tensions in the pnve-*ojh85uge7.kaiw u ,x (ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what q3xsg :cu +8ut ge74cyis the mass of the traffi7ug+ qy3ts8 exc :uc4gc light?

  Two boxes of masses m and 2m are in contact with each other on *tb3qd;7izun.hn ;gjunl p0. a frictionless surface. (See Fig. 4-3.) Wha3zb ;; pgi7.nd*qu.nlt0nhujt is the acceleration of the more massive box?

  Two boxes of masses m and 2m are f4p07hc v76-uhmvc cu in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the7-0fvc h47u u phvccm6 net force on the more massive box?

  Two boxes of masses m and 2m are connected 0*zqex 6sg6ko by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connectik 660ox *sezgqng rope?

  Two boxes of masses m and 2m are connected by a rz,x9lmea- j*l l,c* gjope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the accelere ,z9gx , a-ljl*lj*mcation of the less massive box?

Two boxes are connected by a cord r u4smv90hub/3(cp:mqga1dh dunning over a pulley as shown in Fig. 4-5. Box /h b 1cadupvg0mh(qud3:m 49sI 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 stomv3o7gn3,qil m;4 dm0+ kx fmatic and kinetic frictions between a 3.0-kg box and a desk are 0.40 andlo im 3mn,g;o3k40md7 mv+xq f 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on c9yg m da0:1grwood are 0.50 and 0.4cy1gm 0 9ga:rd0,
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 o0 lg9*7fo4vwlv:ujh in the +x direction. It slows and comes to a stop with a constant accelerationf4uog:90whv 7ll ojv * 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 pull(k y )u *6tehnq(qchw*ed by a 5.0-N force. A 3.0-N fricqhwt ( (nu*ce)kyh6 q*tion force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kh(wk7j 1 )g w-ga7soljg 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 spe r6b, 4lvelp)med of 10 m/s. It slides 50 m on themerp v6) ,4lbl ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident,i 0id2st(kp9;ik-u ;fd o9fyd police find skid marks 90.0 m long.iotd; d(0p-;k99df y2kii fsu They determine the coefficient 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 ar blu2;bimw) ,oe 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 l2uw, ;obmb)imassive 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,bt+qjw x+( 5zu86gtdozdqm t:)(ft z-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. q +x zgdq+(bo85 d(tju,t:tt6zfwm)zIf 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 pmrqtl 5:l4t deb1ia,p++ s (fzd0l4iq lane is inclined at an angl(mdli q: l tlrtz+i+a50bp4 4dfse q1,e of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that maket*0xrzq8h4v:; jsur7bnld .ms 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 angle6oca chl. w6qe2, kxbt 5i0sv3 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 incl ts.,mn94b1 ;r3 gzl:utny vaiined 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 velo7qz:+ju vjp 41j por-scity of 74o:z q j-juprj1pvs+ 6.0 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 mass m sli(/3 z)djha 8op+dbfckdes 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 1/0r wxy-m nfkdown 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 sur8f8-t co/ woqf) rwz/nface. The cable attached to the log makec/ o ztf/8rwq wofn)8-s 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 angle z8pk9anf,)( mix*e q6ec9c dw o fen,p9*c wkx8z6ace9d)m iq( f $33.5^{\circ}$ 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. 06tts/vs k-apshb64se .wkz 9The 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 betw.69vtsz6s ph-ws4kbekt/ a0 seen the object and the plane?