Which of Newton's laws best explains why motorists sh*-c 3es6ast,v b:mj2vfezri5 ould buckle-up?

  When you sit on a chair, the r))y bi rb04ieui pq845nwi f-wesultant force on you is

  In the absence of an external force, a moving f d8/.sjgs(9usa.e v.5eylu robject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turnedaa i,j+j gh.+:sxx ;eo off, while traveling in empty space, iexh+jax.; +,sgo ja: the starship will

  A rocket moves through empty space in a straight line with.+kkzl 7ehd nlzur ,pf( ;p0s3 constant speed. It is far from the gravitational effect of any star .( f;lzrpslde+zk u7pn,0k 3h 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 forward, and you sudxyz2x jklp *4 bm 8ss1/bq,p4(m3 u7fcf6 gfqrdenly fall forward. You can imply from this that/42 *pc,yqm xg 6r7f1upf3b z8(lfsjs4mqbkx the bus's

  You are standing in a moving b*t 8:gw0yqwd3th0e efus, facing forward, and you suddenly fall forward as the bus comes tot0 :yf*e 83hgdqwe0w t an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the ti8go xxa /0(bmotion of the object.

  The acceleration of an object is inversels 2 dbdlppso8.w1e.,woj xr76y proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net fi zi3g9 y0hq5uorce is applied to mh yi9 zg53uqi0ass 2m, then the acceleration will be

  A net force F acts on a mass m and produces a0-j mm,kkqxe rzg)5: zfxh-r -ap7mj5n acceleration a. What acceleration results if a net force 2F acts on mass 4kkrem0jz q)h-- x5m -x gmz:r,fjap75m?

  If you blow up a balloon, and then relqii y1mbl ..+yease it, the balloon will fly away. This is an l1q.i+bmyi.y illustration of

  Two cars collide head-oigr yp fcj k+;h/7 fnw1k-du88n. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal tor pf+kw/ng1j7-kdf8h8y c; i u 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, tqy8pu/ gi39yw4cq5ie he force which the object exerts on you wi/4u cyeiy 85g iq3pq9wll

  Action-reaction forcef8u4 a d6j djf,ld::zws

  Action-reaction force8fotkq f,1z7,b ghs )guea6(us are

  A 20-ton truck collides with a 1e ;uzg:qv 4a7-yz :wfx500-lb car and causes a lot of damage to the car. Since a lot of damage is done on twz:4z;fxavy -u7q: eg he car

  An object of mass m sits on a flat table. The Earth pulls on this obi3il d/9no9q s; bni2 0y; x+ejt:fmdbject with force mg, which we will call the action force.qnyd9 ;03/bdns;b +iijot fmi :9x2l e What is the reaction force?

  A child's toy is suspended from the ceiling by means of a str m:y5zax(m:-esl2tp5 ( jsjiling. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is t(l(:5z2 js5 la-xit:mjmypse he "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous forcedow. r 6ur,ha, nyhsh7,z s)i2. The ball hits the bat with an insto6z,sh ).7u s inwyha,r dr,2hantaneous force, whose magnitude is

State Newton's three lawdv.v 4 d:qj f,k7pgg*os.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Wh,elh7u* 4 kga,h7 ux6cg+klhhich of the following is true about the mass and weight of an astronaut on the Moon's surfahuc7h ,kxg7 ka, g+u6l*he 4lhce, compared to Earth?

  An example of a force which a/ps)v x4rsey1g.bh z9.+pq hu cts at a distance is

  Who has a greater weight to mass ratio, a person weighilmyfn1e/k;1)e fp6 ar ng 400 N or a person weigh /fylp)61rkn; af m1eeing 600 N?

  A stone is thrown straight up. At the top of its path, the net force acting oxui yu y/p.6f*k4+ 3exqro; fdn iyi ;e.p4*/k du o+ruxf6q3xf yt is

  A 20-N weight and a 5.0-N weighxi1 mf,m-ryg*th7ma 40 dda :wb,*ho rt are dropped simultaneously from the same height. Ignorema d myg:,rdx hw,7r1f0b** ha4toi- m air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respec (swd5;ve)kmptive terminal velocities. Which objec w5kvp sm)ed;(t experiences the greater force of air friction?

  An object of mass m is hango4.i(jcuxr/ 1mm/ is9lcc m7ying by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the st7c9j im/xio4 ym.cl/ (mcu1srring?

  An object of mass m is hanging by a strw y .ejzg0*w,tikh(y 1ing from the ceiling of an elevator. The elevator is moving upward, but slowing dow*1 .0etyy ,kw(gjz hiwn. What is the tension in the string?

  The force that keeps you from sliding on an i-4cad d4(2qk5 m evxvicy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to keexbg2n2 tg) l,ip pushi ) 2ixlgnb,2tgng it with constant velocity, because

  A horizontal force accelerates a bo o 7et89kjcbhgg:4m.ex from rest 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. 8:7o4b. gjctkhegm e9 What happens to the box's acceleration?

  A packing crate slideso(h u 9ek6)mf6ucvu ,lmxv27w down an inclined ramp at constant velocity. Thus we can deduco(umw2 c 6v,l9mh u6)fekx7uve that

  A block of mass M slides down a frictionless plane ie)nbwf9pyh adc9 +yi2 y.u9 s3nclined at an angle q with the horizontal. The normal reaction force e+b3 a.c wf yy)uidp9yn2h99sexerted by the plane on the block is

  A block of mass M slides dow/+o :f8 iw od6av,+i0 ym6bq)ehdddsmn a frictionless plane inclined at an angle q with the horizontal. ma+:ifwdqdobs/0 e i h 6y+m)do,d6v8The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frv+ddt.a)c6j, s ezvfen vj1z+x2h 65fictionless plane inclined at an angle q with the horizone d2v 5 fdv++zjsv1e ),hafc.t6j x6zntal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclinedn dh.in6 zdz1) plane that makes an angle of 30ei hnz z1d6d).n with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appi dr-lf;jvb1dr/3 z i)lied to the object, and it accd;r f3 lj1divbr- /iz)elerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest cxaj5jcaf8l ./pfsb jt 9b3n+(o1e e, to 27 m/s in 7.0 s. What is the average forward force oejpx 8clbsj 3 anf (5taf19. bo,+cej/n the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. W81v lhv m80x-p3qxfbmw.baw)t oj83rhat is the net force actingvab) .v x-3pqfmwj l rh1w30 t8x8mb8o on the body?

  An antitank weapon fires a 3.00bwsr*eqy,:h0 3keuqgrg ,6 d5-kg rocket which acquires a speed of 50.0 m/s after travelin0hyk3,d be w5qurs q:e*6grg, g
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 mass f q hyntgv/h:s,a12/ xcrom rest,xscn2:hv/gtha/ y q1 ,

  What is the mass of a person fv2+ wx3pu;zyv 38( oh0 hnffgwho weighs 110 lb?

  What is the mass of an object that weighs 250 N on the d ,)e /2i-e(mds1 ,dkuaauwd osurface of the Earth where the acceleration du dwu1(-2duamo sk,id,ae/d)ee to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What i8*2xcke7, nco1vmh xdp 8z8 qks the mass of the object on the surface of the Moon wher pvc,7q 8nxh k *1xocme8zd8k2e the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on )nhr./ij ss j93g*e blEarth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth.lh3 *)b/ijjnse9 rgs's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of*x2m1wavf cj1*u 1lg)x syd: f a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope acceleru jfym:fc)sdawg21 ** lxv1x1ates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. Adcr51( gz1 +/c t;lllwcfwy *rdvy,5a force F acts on the stack zfc5cy gl,d1wlvcy*t( a 5r;/+wr1dl, 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 kv l6* ewyjd 49)em1nkan elevator. What will the scale be reading when the elevator is a61 )ed jwn*9kymelk4 vccelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. bqjr162h bqd) If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration 62qd)jb1rbq h of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. I ,ld4dqucqc sine-:9(f the mass of the person is 60.0 kg and the elevator acceler s,d-cq4: nd9i lqeu(cates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act iu24 wpi9*ol;ap9 vdeon a 5.0-kg mass. One force 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 accelerapup2i4;*aw o d 99eilvtion of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in plald(h* *zkci ce4(l.xkce by metal brackets that can exert a maximum horizontal force of 9000 N. Whk(.ieklch(d4 * *clzxen 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 the flatbedu gsn ad;+yc;, of a truck. It is held in place by metal brackets that can exert a maximum horizontal;+syaun ,cg;d 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 Fisvq+ r.jns2 /hg. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magr j.+sqvsn2h/nitude 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 = qfyx ( .zvw(ed7 c:1es0.40 kg, what is the tension in the string? (Ignore.qv 7((dxezwfc1: s ey friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force3wvu 0 ogj;(k2eiik; k of 100 N in ok;g (0;2uevj3iwkik 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 horizontal floor with a forcp t di2m mz;m,m tzzja(4-s9aah5q+e1e of 100 N in a direction of 37.0e above the horizontal. If the mass of thz mpta2 45m-jh;a,mqa mzs1d t+z9ei(e 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 sz6w zm a3skm901oxnc 8hown in Fig. 4-2. What are the tensions insa38n0wz9zcxmkm o16 the ropes?

  In Fig. 4-2, if the tensions in the ryi zln9s 01ln-opes are 50 N, what is the mass of the traffic lnyl zis 9n10-light?

  Two boxes of masses m and 2m are in contact with eacrqku3f (n6: ldh other on a frictionless surface. (See Fig. 4- 3ukl:6n(qfdr 3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other8m v0ba+ byikp: s8an7 on a frictionless surface. (See Fig. 4-3.) What is the net force ony+7s0a8: nmbpiab8vk the more massive box?

  Two boxes of masses m and kzat0 bah x0q3p r2++v2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in qprx +0b3h+zv02kata the connecting rope?

  Two boxes of masses m and 2m are connecxcw+: phl6q,9mvr:jo .c zi3 y1wyr /vccc- n+ted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the leqx cwhmyly-cv .3:c:o6pzvi 1rn,j+c wcr/ 9+ss massive box?

Two boxes are connected by a c8ao ,w+vx uw*w7pn bh6ord running over a pulley as shown in Fig. 4-5. B7 ,w n+auw*pvh8bo6xwox 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 fricti /3,yo dn6m:zo:itelsl+ z9 g+jwi vb8ons between a 3.0-kg box and a desk are 0.40 and 0.30 izew9in8j6zol bd3+yso:gvl: +, /tm, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of stamd0et tw9be6vq u 126stic and kinetic frictions for plastic on wood are 0.50 and 0.4qbew vums0692 edt6t10,
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 liv:7 f1aey.xc evel surface in the +x direction. It slows and comes to a stop with a constant acceleration o1y ixac.:ef7 vf -$2.45 \; m/s^2$. 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-Nfmzsq.5 e0qnni1h 0h5 ,wgf8 f force. A 3.0-N friction f.1qigfh efq8n5mfn0 ws,50z horce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N acceleratesb ):le4sc;h9ry p k;9e rxc-hy 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 initi;2aet tk1 6wdcal speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck a wc;attk2d1 6end the ice?

  During the investigation of a traffic accident, police find skge/gp1k si w1) hyn0cw+f4cp+id marks 90.0 m long. They determine the coefficient of fricp yf+p+ c1ke gwn/0gwi1s4h) ction 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 )jc)mf k59octm7r:r)qm;yb i.) The surface between the mq7kfmmjy)t:c;r )ic) 5o r9b 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 the less massive box?

  Two boxes of masses m and 3m are stacked. (Se+r qjrdc )3xpiz3vi(6e 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 tjxv3rrz 6qi+p(di )3che 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. gtg h h,t,uf7)a /zs9u The plane is inclined at an angluz, hgg9t/ah u),s7fte of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an4xe* ,hmjdi-5vm5 xlpt;os*p 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 angle ofu a lznt;32+ 8xjmjs-j $37^{\circ}$ 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 plane tiltedryw5 2-mz1vhx)m won* f:bu,d 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 downxnt o. xx-q; tb5m:ig+w7al-p an inclined plane, at a constant velocity of 6.0 xbw5xmxnt7 q-go; :-. tipal+ 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 masdgp*n gy3 mo1dlk05 t.s 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 a rough i3wkbyv,w9q ql ,c4x1x8o2 jp $37^{\circ}$ 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 wei 1 m1a9pw*g/xek.gcpum 6jiw: ghing 500 N along a rough surface. The cable attached to the log makes an angle of .9 mp/ k1:u gw*a6 jcgwxipm1e$30.0^{\circ}$ 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 auc,j1bnui7 asj-+jz2mwa ouo ,)z0d5 t an angle o) ajaon-j ,m7 1scdz wuz0+buji 2ou,5f $33.5^{\circ}$ 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 d e+3a0*2t oyeyo.jn vincline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static fricti*va+e oe3 y0n.ytoj2don between the object and the plane?