Which of Newton's laws best explains why motorists should vp okf+g;kf 14buckle-up?

  When you sit on a chaiucw c* q ozdgw)q.+:g 8m.*skvr, the resultant force on you is

  In the absence of an external force, a moving object r j+r7olm vp; :fdhv*/will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sudd+qa2r3bugb ij7 -q fri2i/6ypenly turned off, while traveling in empt7riy b/i2a6j q +3p2fiqg -urby space, the starship will

  A rocket moves through empty space (9hh h z0pmwrkqx9t.9in a straight line with constant speed. It is far from the gravitational effect of.hwhrxk0q z9 (t99mp h 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 fr87jl gd(f sn-orward, and you suddenly fall forward. You can imply from thisd7lr- jn8(gsf that the bus's

  You are standing in a moving bus, facing forward, and you sud1lqz b4dg+o3xr(y4jwdenly fall forward as the bus comes to an immediate stop. What wlq1 j r+x4gy 43ob(zdforce caused you to fall forward?

  A constant net force acts on an object. Describe the motiori ts.gcf-9)gn of the object.

  The acceleration of an object is inverse:ij: f*sy r;rzly proportional to

  A net force F accelerates a mass m with an accelerationql/9c 63*sgj j ;+pr.ipn7k6onxvl xq a. If the same net force is applied to mass 2m, then the accelenqk xjojci/+7x6;6pqls 3rv 9l np*.g ration will be

  A net force F acts on a mass m and produces an accekqgjd,+77u kwhu;1xg/ xjzf6leration a. What acceleration results if a net force 2F acts on+ ufd,k u7gk7; hjwg1zj6q x/x mass 4m?

  If you blow up a balloon, and then releasyviud9: g gc61e it, the balloon will fly away. This is an i:cg vui61ydg 9llustration of

  Two cars collide head-on. Aty)tyy0f dmx(1co7 2hj6 i d;kh every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnit6mxy7 )hyd;1j i hkcf2ty0(o dude of the force the second car exerts on the first. This is an example of

  If you exert a force F on ax5 u8zg,dkdnje9jb +5kj7 kp3n object, the force which the object exerts on you widejz dk3k,n+ u59kxjb pg58j7ll

  Action-reaction forces k9khab fah2,4ke6h:u

  Action-reaction forces arejxekm jfs6*8 jc6 cmd6 ce97h(

  A 20-ton truck collides p60 ,m3t,4l10 bskaddxuod a ewith a 1500-lb car and causes a lot of damage to the car. Sin006xla u bakdme3d,dst,4o 1p ce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object wi5j;svd. te fj5th force mg, which we will call the action force. Whjs tj5;f. vd5eat is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Ear.89qher9v. 9jxoqhq ath pulls downward on the roje 8a.qq9h.99qxvh 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 1zke7qm5gpm2 qbe:x + 8dp;.hr500-N instantaneous force. The ball hits the bat with an instantaneo;:2gp+5h 7 zqr e.qmdempkbx8 us force, whose magnitude is

State Newton's three lalw;i rgxjifxi5 e;3- i otu2;5ws.

  Mass and weight

  The acceleration due to gravity is loweo g*4bqtjr)3v r on the Moon than on Earth. Which of the following is true about the mass and we )vo*qjgb43t right of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at .j+i2(d *chbd*qj xtm a distance is

  Who has a greater weight to mass ratio, a person x8 58e9zgb h 3xpm col/+ket,zweighing 400 N or a person weig8z,3/b +8 hpk9 ezmctxelogx5hing 600 N?

  A stone is thrown straight up. At the top of iti(ik9p6 1gi nis path, the net force acting on i( iikp16 9ingit is

  A 20-N weight and a 5.0-N weight are dropped simultaneously fromh ;lfqx;z9ena m yxdpy7j,69+ the same height. Ignjmn7fda9hexl, x; yyz6+q;p 9ore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their r. ty/g)bm (xo7 c9v+uj2yackrespective terminal velocities. Which)b2coca.r9+tyy (mu vjx/7kg object experiences the greater force of air friction?

  An object of mass m is hang;ze/ rb5hld1w,)x aioing by a string from the ceiling of an elevator. The eleox5w;zdbi a1e/ hr) l,vator 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 akg:ead;-( y,v55nq0hh f7vgmual dq 5f3 ,urelevator. The elevator is moving upward, but slowing down. What udl 5a0y n 75r5; vu ffahvk:q,, g-e3ahgdmq(is the tension in the string?

  The force that keeps you from sliding on 8 /w8(q) m7a z37cst;p gfoqe+a koridan icy sidewalk is

  It's more difficult to start moving a heavy carton fro;vk i(;q1ky1+f1ar u//rk gr trspb -h+gnb1fm rest than it is to keep gvf k/+ huf/rrb1;; 1yr-qgras k(i+nb11ktppushing it with constant velocity, because

  A horizontal force accelerates a box from rest across a 94o*5u, :peo.cvh r9r,mpvy zy (szqvhorizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the h 9srov5(*uvprv.pz,yezoy9,m4c h : qorizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus we cam.;vv;+rl:lp w8q p ynvg +pt9n delp:.;++npvql;8gy 9 w mprv tvduce that

  A block of mass M slides down a frictionwxqq6h5z d/- oless plane inclined at an angle q with the horizontal. z6wx-qh5 /qodThe normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle11j;l8p:pf7u7rfy qx/gzpz 8-f z2kcozz cn8 q with the horizontal. The normal reacti8zp 28zn f8kgz/ 1f :pcczlp;xz7 1fqy7ojur-on 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 tco)bastp*;bos 3 a;y4tx5e0h zv 5j 0ehe horizontal. The gravitationaabse jzph*y4c xo0beva3) s5tt; 5;0ol force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined 2 xdv1 (pwbrv(gzgiv4k l sh:tg(ks0*p3/g5h plane that makes an angle of 30e with the horizontal. Make a statement whirb5tgz4g/gshgpd*2vx w(:s0 i1l( k( vv hp3kch best describes their acceleration after being released.

  An object sits on a fric87+psb tcn7t4 n qg0z(n jhb odwv/)r;tionless surface. A 16-N force is applied to the object, and it accelerates 0wdnnj7btob + n (48h;rpz gc /7sqtv)at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerat,oe2mp hs6h0vx o ,4jbe from rest to 27 m/s in 7.0 s. What is the average forw4xjo0 b hm ,oe,6hps2vard force on the car?

  Starting from rest, a 4.0-kg body reaches w c5)to ltj/vz d0+6nca speed of 8.0 m/s in 2.0 s. What is the net force acting on the c clz+j)50vw /ndot6tbody?

  An antitank weapon fires a 3.00-kg rocket whicht tq4 5nm;pts7 c0wyk0 acquires a speed of 50.0 m/s aftemqcp74ns;wy 5tt0k 0tr traveling
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 massqftmejw) )i(; d,iyb- from resti , jidy ;)(m-)fwtebq,

  What is the mass of e8ad75z qjqv p:4 y(fna person who weighs 110 lb?

  What is the mass of an objec6 jd+ gwy8*zqxu) .pmrt that weighs 250 N on the surface of the Earth where the acceleration due to gravity i 8j+zurmy qdpg x.*6)ws $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object owa lski yan99 .4,dq1kts3w j290mzpzn the surface of the Moon where the acceleration due to gravity is only 1/6 of that on yikas42s9, dmzj a1 9wzt0 n3 qk.lwp9the Earth?

  Object A weighs 40 N on Earth, and object B weighs 4cc wb))abztdb 4n(td fej. s jv:.7k7+0 N on the Moon. The Moon's gravity is)tnta)+e (cvfbsbbzc4 7.j : 7kdd. jw one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pufqo45kybs q/ ovs73o t1x66-2ebz ohulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope acceleratev 65q esb-1zqo4/ s 7t2oboh6fouxyk3s toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level fricu5(,.l s/jvae nr0 olotionless surface. A force F acts on the stack, and it accele0sv or.lo( ,/lj5enaurates 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 )9iph tqsd:--culj 9selevator. What will the scale iqtdjp-h9: l)c9uss- be reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass 8 8,xnwxd8c-ii fc/dvof the person is 60.0 kg and the elevator accelerates doxxdc8vi8i/fdw-n8c, wnward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ridesa4kgp1:oi 0dud9y) lw in an elevator. If the mass of the person is 60.0 kg and the elevkudda 4w 1)pgyi0o: l9ator accelerates 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 has a mag;ngok: )*qfzbu(com6nitude of 8.0 N and is directed due north.*f;(6n u kcogbqm: zo) 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 k +c/c*oqe4att g rests 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 stopping distance if the load is not to slide forward into the cabq/cc*ao 4t+t e?

  An object of mass 6000 kg rests on flr0a)ex .-rrthe flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Wh -f) 0rear.rlxen 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 kg, what *x/ 7u btnmtq(nkvn/5is the magnitude of the accelerationnq7(/ ntxvt knb5m/ *u of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, .q-3y /jcwbtb1 a es.yif M = 0.60 kg and m = 0.40 kg, what is the 1bt w/.e sc- 3j.bqyyatension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor wit7rp jmsj6 6pf7dt -4wyh a force of 100 N in a dire 7rs6ppj- yj4mt76 fwdction 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 horizontal floor with a force of 100.mi; 1bajdnln;4c hj+ N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, what is the normaln.1lhn+m; c dijbja;4 force on the box?

  A traffic light of weigh 5:20p ccjpt6 vydsui.t 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensit6ysccj25ui p.0d: vp ons in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is6w e o s+fdh gep90p,x;cdl7,q the mass of the traffic lip90co 6,s7d+ ge,fxedpq hlw;ght?

  Two boxes of masses m and 2m are in contact .dx cem1gom-.with each other on a frictionless surface. .mm-d 1o ceg.x(See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in3, h l 8my+4y5q5476 yjmgdhdfld hasb contact with each other on a frictionless surface. (See +hah bj4f g54d,mydsyhmdly583 7l6qFig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If nrfxs7y 7i19)td feg4c 8kn,dthe forward force on the more massive box is F, what e 77fdc)tyn48kris1 fngx,9 d is the tension in the connecting rope?

  Two boxes of masses m and 2m are connecoeu.oxrq)+ y3,+w tac d rq-4kted by a rope. (See Fig. 4-4.) If the forwarxo3+d)rqtwe c y, ko4q+.ru-ad 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 p8mpm-k)cx ztz 1c:5 qlulley as shown in Fig. 4-5. Box -k:5zm tpmlzq8xc1 c) 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 frictio(36x q lwqz rjzq+z,ks0u03eqns 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 to3ex,l(uqs+qz6w0 r 0jqz zk3q the box?

  The coefficients of static and kineufxj :.vprrr dr1w *:2n gj* 043xjcjjtic frictions for plastic on wood are 0.50 and 0.40,0:rdjgj1* *jrfuxp:w2 4xjr vnc3rj.
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 direction. It slows and * nb z6z5 s4o*zqtje,icomes to a stoje45zs nb**q, 6zi ztop with a constant 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 horizonlweb3y s0k17yx: :b mrtal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration o7e:wy:ysbx0 r1lm3k b f the object?

  A horizontal force of 5.i( hskf1/xw.1ue0 wox0 N 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 1ba3fc6h:*ewc mu*-e ,ea s;pg 0 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic frictio,se- *wc:pe h6ufb;m3gcaea* n between the puck and the ice?

  During the investigation of a traffic accident, police find skst tje-h:k ,n)id 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 the speed of the car - ehjt ,:stn)kwhen the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) Thewzu6 m1fdjx p /ik,5t9 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 friction force on th ,9kt6z1i wxd5mj/fupe less massive box?

  Two boxes of masses m * snp-.o8p 3/z4 xt5fjisgbrzand 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 s - *pz /3jrzbx8nsopgt5.fi4 the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless incl2l)ra6m: zxele) o -wnz*lm)iined plane. The plane is inclined at an angleeelm)* 6m:nz-xoli)zwa) rl2 of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a fla sen8nv66f4lm t hill 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 z*yhwowep6dx ij ;;6dc8t9-w smooth 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 b.u +n ;ne: 4.xx zzlwrpx(ps7inclined 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 pc*.dwv50wwf gcc7be6 lane, at a constant velocity of7. vwcf 65ccedw g0b*w 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 slides dow:4sn 1ywtfh0 wkk a-4pik3 ilgg)5p8qn 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 slidpqjb a2 6bbxuq 3,vwd6p clhkxn+- -w7n)*1qees 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 rough surface. The cabl p39pk7 :q.i0t t:ulhmr2km ;mspbo,we attached to the bpq ,:: 2 rpu tim7pm03mhok9stkl.;wlog 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 incvbhb8fw 47c:28nm+mmoe0 nnb lined plane tilted at an angle of 280omen84nn hb7b + fwcb :vmm$33.5^{\circ}$ 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 angle of incline is gtv3i7 -vs3 hhqradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of statich33vtqs ih- v7 friction between the object and the plane?