Which of Newton's laws best explaine6ya5 c vf-fg+s why motorists should buckle-up?

  When you sit on a chair, the resultant forceefr9 *top;gw. z:47xwm dy3vu on you is

  In the absence of an external force, a moving obq s:jb*ve;)ja2 ibak-ject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN a*dnasnwr1g 6-,y - bk*sj y1 y3*bqyudre suddenly turned off, while traveling in empty space, the sta- yyqbjy g *ad1s3u,n br6 sdkw-*y1*nrship will

  A rocket moves through ed2+wwot g t 7 ulw5i a*pm1bf/gdb:+1jmpty space in a straight 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 i +7dp+wwamb f /t uo*jg1b5g:tdw21l the rocket in order to sustain its motion is

  You are standing in axs5idc):p zl.0fhx w: moving bus, facing forward, and you suddenly fall forward. You can impx5:d zcflhp0wi :.sx)ly from this that the bus's

  You are standing in a moving bus, facing forward, and you sut f 2dn)o 1rpboyf,n7msvzv+d/y) u/;ddenly fall forward as the bus comes to an immediate stop. What ofm //vyv1+)n)td2orunbpf;sy7z d ,force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objet b9hmavv0 b:z)3zwy4 ct.

  The acceleration of an objectthw)+i/ga7 nrfa8 sw9 is inversely proportional to

  A net force F accelerates a mass mwltqq 872dq;(l+in e k /wn4kq with an acceleration a. If the same net force is applied to mass 2m, then the accelernw/e2;n8q(wldtkq47 qi q lk+ation will be

  A net force F acts on a mass m and produceufj 5j c78giuo ;(f7cys an acceleration a. What acceleration results if a77u ufy;cigjoc 8f(j5 net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fpfvfr + t2ak--ly away. This fvtfa--kp2+ris an illustration of

  Two cars collide head-on. At every moment during the col8qup6x/0c4d xf1io 9pmpw-a mlision, the magnitude of the force the first car exerts on the second is exactly equal to the magnm a091-uiow pd x pxqmf/8p46citude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an object, the force which the object exert mo2u/t ,m;r)ila,s tq:u-wid s on you wim 2s t/du,;:lq)i-mitaw uo, rll

  Action-reaction forceb qj88xg 4bce0orly 90qia3)fs

  Action-reaction forces k8;iemki txcg(6li. *hf5i5oare

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to2az( 63 l2o -wc5cas;;e y6l vg9xsf pnle0gzk the car. Since a lot of damage is done on the c;56 zofn2zlea -2ks9wlxv6clgg3 pa 0(s;c eyar

  An object of mass m sits on a flat table. fmg.ww; b6h)qThe Earth pulls on this object with force mg, which we will call the action force. What is the reaction fowbm f;)q w6g.hrce?

  A child's toy is suspended from the ceiling by means of a string. The Ealrnpx v e9 ((gb.3io*yrth pulls downward on the toy with its weigy (bg9pir.(3oel xn*v ht force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched treqao g( r. i,e+(7;arrl5i+o 5lack bo you with a 1500-N instantaneous force. The ball hits the bat with an instantane( argrr ( ae+obqi,o+7 eia5; .lkl5crous force, whose magnitude is

State Newton's three lawjf huz*kdv5.*0te y e8v /h(dbs.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than i)w5gqerqipt 8u9 s2.k,(ye+rqm f* l on Earth. Which of the following is true about the mass and weight of an astronaemlf pg89 5. +2q,qy) rsq* trukwie(iut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance 9f : 5eoj 5wevhnamsw x./z98cis

  Who has a greater weight to mass ratio, a person weighing 400 N or a 2l-vm;p/q -v*vgnl tc xdf2.p person weighmd ;v vl*2nl2p c-v.ptg q-/xfing 600 N?

  A stone is thrown straight up. At the top ) ;t; 5jjsxqviof its path, the net force acting on it is5 ;jtqx)ij;sv

  A 20-N weight and a 5.0-N weight are drop,f ua) v gw1:ufjztb v;q: 5bl2pbi*r,ped simultaneously from the same height. Ignore air a 1jrtb,b pfw* f:qugv v2:zlu;,b i5)resistance. Compare their accelerations.

  A brick and a feather fall to the earth a ke5:avpf pi1)t their respective terminal velocities. Whichea1kipvp5 f): object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. Th uuwkm :ucf bv6;v25p(0tijs 7e elevator is tfuiu 5( sck6v;:mj2ubwp0 7vmoving 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 elevator. T ihr8ycry+62-tt gww4 oz8 gs)he elevator is moving upward, but swr)-yg t2hyzo sr88gcwt+64 ilowing down. What is the tension in the string?

  The force that keeps you from sliding on f 4uwf-0(* c xdkvt1zcan icy sidewalk is

  It's more difficult to start moving a heavy carton from rest th9l r;0a2gjo btz: c;l og 0d+pnul2h8ian it is to keep pushing it with constant;jb0; ruo2 ngg pdh+a8 zcil0:2o9 ltl velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface (fr8an ms4 xwf6x95.won6z,tuf biction 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 the box's a. ntzba 86w f9xosx4,wmfu5n6cceleration?

  A packing crate slides down an inclined ramp at const* e) hb 2ua2ki;wu1gnnant velocity. Thus we can dub*n1 ) ;wg22naehiku educe that

  A block of mass M slides doson5(4o) o qxspctz.ws57 jn;wn a frictionless plane inclined at an angle q with the horizontal. The normal reaction force oonq( 55o wt)j;4s p7xsz.s ncexerted by the plane on the block is

  A block of mass M slidezswp1d. -p2,g h8; k mctip4chs down a frictionless plane inclined at an angle q with the horizontal. The normals;1d.hz g2 p,imhp-kpwc c4 t8 reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined atiac5zt*2gu .f(eq0a0ff . gjp an angle q with the horizontal. The gravitationa2 agu zq (ef*5tfc0j p0.i.gfal force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneouslyo2 k.c -eali iz1-nbnu-f7 dj6 on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acc7kcu-fz-d-ia .n j1l i2oeb 6neleration after being released.

  An object sits on a friclqm *gk w, a8rpaj0m.*tionless surface. A 16-N force is applied to the object, andg ,ma0r j8kl*wqm .ap* it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg ca+o:xvltou am8 g x)mr+y47b +kn accelerate from rest to 27 m/s in 7.0 s. What is the average forward for +l:o)xgb+vy mo+8mu4x artk7ce on the car?

  Starting from rest, a 4.0-kg body x6 oe h:z6l+3iggg- s4hn(tvqreaches a speed of 8.0 m/s in 2.0 s. What is q 6tz x6-soingh( ev4gh+lg3:the net force acting on the body?

  An antitank weapon fires a 3.bqycy9 e.bm4j5wns7rt:s(ytg8* f e/ 00-kg rocket which acquires a speed of 50.0 m/s after travelinstb yr y478 b.:gcyf/* 9j(wn stqe5meg
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 icos y,1+xfp (mass from resy(+cf1x, spoit,

  What is the mass of a per2:y n hi;tupfzed ./,di5cs;rson who weighs 110 lb?

  What is the mass of an object that wnxya1n ymy;: .te1b rg8/n5yv eighs 250 N on the surface of the Earth where the acceleratio1na nn/5gm8yy bxe. ;1try:vyn 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 zk w-bm2n yv1ev*zb7(the object on the surface of the Moon where the acceleration due zn(v-2 zvb7wekbm* 1yto gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B wt g2 wtj1c-hh:eighs 40 N on the Moon. The Moon's gravity is one sixth of Earthg1-htt:jh c w2's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg f 8lodwze.b;d *w;tfr2-oel7 rope. Sue pulls with a 15-N force. .f7;loe ob*rtfw-2z8wded;l 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 acts on t.go. 0nvq 0 9om3ovsdrhe stack, and it accelerates q0ngs3.mo9oorv0v.d 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 scaez,b9u/ 0bur da8m. f-6h(z(jxapcyy le be reading when9j8, ap( uz/dcrx- h. 6ye0b(uazyfmb the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If th*ab2*ce(/ 81eae;g j tfbpdht e mass of the person is 60.0 kg and the elevator accelerates downec heb;d *a*tp t/1efjb 2ag(8ward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the nz:fzqwf(e7 8mass of the person is 60.0 kg and the e(:zenf q8w zf7levator 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. Onx+mxpx*pztbd:1av(- e force has a magnitude of 8.0 N and is directemd(v:-bp+az txx xp1*d 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 6000ks s-y hx9 gvy6j i)9c0pt93pa kg rests on the flatbed of a truck. It is held in place by metal0jscg 9h3i99s6k)pxty - ap vy 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 cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is hr a56je,a5 o7 jqt.mvjayb.l4eld in place by metal brackets that can exert a maximum horizontal, 6tjqa7jyjvr ml.b4a.55o ae 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 kg3eqmi*11i nh9 ; ,eyaqywsbw:, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of theqi13ie bn *meya 9,wsw:;yh 1q pulley.)

  In the Atwood machine shown in Fig. 4-1, if yxl0l9kc *m3pM = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the massmkx09pl* l3 yc of the pulley.)

  A student pulls a box of books on a smo(a xo 3s m7epvn30a-ozoth horizontal floor with a force of 100 N s p3mao0nzo73v- xe(a 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;j zc iau7f62o on a smooth 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 books is 40.0 kg, what is the normal force on the box?;uo6 icfa7j2z

  A traffic light of weight 100 N is supported by twovfp9em1.ln d4 *m3fmf1w:q gt ropes as shown in Fig. 4-2. What are the tensions in them1p4 tf.9fm mqnd1:lgf3* v we ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what i gi5j-v cm,)wszxvr0t. gyo6. s the mass of the traffic lightr cj)w5i-mv sg 0o, .zgtv.6yx?

  Two boxes of masses m and 2m are in contact with each other on a frictionless se 6ayl nlq5 wr zv5(p3yu18r)curface. (See Fig. 4-3.) What is the acceleration ly wle8c5zvqauy1 6(3 p5)nrrof the more massive box?

  Two boxes of masses m and 2m are in contact with each ot o;s 3x;g5kvv)r sdmf3* .tl3jhhr4qcher on a frictionless surface. (See Fig. 4-3.) What is the net force on the mo3kd4 xh*f;sc rh3vl; tm 5.s3jrqv g)ore massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-eb+4fgv8-q,6 vsh54 n ghhw ee4.) If the forward force on the more massive box is F, s4vfheh+w4geeqv6, 85-ngb h what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connecad ghld5 1d;k/ted by a rope. (See Fig. 4-4.) If the forw;add g1h5kd l/ard 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 as shown in Fig9 kk 4af7lzg26:bava z. 4-5. Box I of maf62bg zk49a vzal: k7ass
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 , uf8pgaz cag3s5e/pxcmc 2,po m s-*7and a desk are 0.40 and 0.30, respectively. What is the net force onp,m*mug7cp s /a2 8os-cgz3,ec a5 fxp the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions foe 5.,fdfxhjt43wj ;dm r plastic on wood are 0.50 and 0.f4j; hjmf,.xtded3 5w40,
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 comet5 e pj/njm*v/s to a stop with a constant acceleration n ej 5/mjpv/t*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 hohn h1gw,rn r s9w)5mrmd3g+x1 rizontal surface is pulled by a 5.0-N force. A 3.0-N frnd9g 31hr+5m mg, )whsr wxnr1iction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg ea)// 0 tz0ua6t9hed qym 9hnzmass, 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 ,psdl/8hzhacz- lb0;initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetiahl -b0,p ;zzhcdsl8/c friction between the puck and the ice?

  During the investigation of a traffic accident, 7osxjb*5iu jcmqh f/kx* 2) /kpolice find skid marks 90.0 m long. They ism5k7fo*2jq u cx b/jhk*x)/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 are stacked. (S0sht1 )ko3:fm e9d vu e--fskcee 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 static friction force on the dcff- 9 e3m0kkvs:s o-h1ut)eless massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4 m/de;xsp:; xa2ek7x u.4h dmw-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. mpmsw ; a/ek4ued2x x.d;h:7xIf 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. Tgq 0/duzki:e.ka8n kb g)ay+ ;he plane is inclined at an angle g;ai0qb kak:k8gy ) dne.+/zuof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an ar+ftseit 9t5n+w3n 7 lngle 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 i k+e lewe- w165zr5/vj0f,n6 wxnmtqmnclined 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 ixz :d. i8,y yh r5fzitfux7o9/nclined 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 vyq;a(o9e i6o5f,kruh elocity of; uho,qi eor 5k(yaf69 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 2ccuxp/(yn 2m 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 5mtkw:nx829ix fw *prm slides 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 aloc- 3ixmbg+x r,mvq-.png a rough surface. The cable attached to the log +v-g m3-q.c pbx,mirx 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 angle2q ifl zgt2toz*h +3a4 og3q2tz tlo+z*f ha24if $33.5^{\circ}$ 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 indszlt oec*3i)37oy /z clined 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 friction between the object i7 / dtz*3cz)yool3se and the plane?