Which of Newton's laws best explains why motof8f3 blz+( rk,xn 1gojh4 +mb bfjx:(hrists should buckle-up?

  When you sit on a chair, the resul -,g-n ht qtlw;)m+gnitant force on you is

  In the absence of an external force, a moving object will eu1u38p6me) v4ryd ji

  When the rocket engines on the s5p8s43ts tly yp4t e4wtarship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space,4ps8 yty s4pt45lw3te the starship will

  A rocket moves through empty space in a straight line with constant speed.0bf9l lgf qs+/um/l )m It is far from the gravitational effect of any star or plane90+ml/ufflgl mb) s /qt. 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, facs1k)g5dw ,9gc6 eopzwy 2+jgping forward, and you suddenly fall forward. You can imply from this gw2 e5+pgy9 dsg1ocj),k wzp6 that the bus's

  You are standing in a movih0 5/h m9oogrlng bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force g0hl o5rmho/9 caused you to fall forward?

  A constant net force acts on an object. Describe the motion ouj+ 2kd z.v813ydjzrk f the object.

  The acceleration of an object is ini+ w 06zb pz/8tqkd,ezrtk/a; versely proportional to

  A net force F accelerates a mass m with an acceleration a. If the +kl,gzluyzuh3a (/v 3same net force is applied to muz3ay3u,z gkh v+(l /lass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What accele v6b1yvhoeuwaqp4 ; v2-5.rzfration results if a net force 2F acts on mass 4m?v5 v.zbaepurwyf 26vo- 1q h;4

  If you blow up a balloonaily.d/,wcv n*hn4 (h, and then release it, the balloon will fly away. This is an illusc h(nv*.halw,/yn di4 tration of

  Two cars collide head-on. At every moment during the collision, the magni,m s (dvs.noqvd-iry )e1)/ ahtude of oy),/.eq-idhmv ( va rsn)s1dthe force the first car exerts on the second is exactly equal to 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 objevj 8 n;/32hq4klfdipnct, the force which the object exerts on you wil3n; h8ndqv/f42jikp l l

  Action-reaction forcrbg5 zls8zf 7o fc:96ues

  Action-reaction forces ardwfqbevv/e- ;i *h39a e

  A 20-ton truck collides wx ,(( nf*8w zbay4duqbith a 1500-lb car and causes a lot of damage to the car. 8 f ,*bq(znxb(dwyua4 Since a lot of damage is done on the car

  An object of mass m sits on a flat table. The Ea s0a1w f.xqn;u(n;tu yrth pulls on this object with force mg, q01nw ;uauxy ft.;ns(which we will call the action force. What is the reaction force?

  A child's toy is suspend5u1a5t4uld s.y z n7uped from the ceiling by means of a string. The Earth pulls downward on the toy with it4tdzal57 5u upunsy1 .s 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 1500-N instaax3pzqauq)7og b k f81 -w4xa7ntaneous force. The ball hits the bat with41x)oq g x q7b-a873u zfwapka an instantaneous force, whose magnitude is

State Newton's three laws. 1n/iv, kijh0hxa+9,- bzv7ktxh)igi

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which j34 /h j0-jqdvmh-va3ay) xxyof the following is true about the mass and weight of an astronautyy)j0 /h43j-a-a vdx3jmxvqh on the Moon's surface, compared to Earth?

  An example of a force which acts at a dist gc4o0i) k iu:zia1bi)s ,nf8eance is

  Who has a greater weigh:y+wh;3wff;f *6hqptldlz 0p t to mass ratio, a person weighing 400 N or a person weighing 6 +f 3fq*w6lwpzh:yd tp;0;hfl00 N?

  A stone is thrown straight up. At the top of its path, the net force acq3es. 5a nwbd6tar t 8.3q3iprting on it is ei3tnr5a .tqw6b33p8q rsa.d

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the samxbjr k n6d/,ogq*b8a1 e height. Ignore air resistance. Compare their acc8jxoq ,a6rb /g1*kbdn elerations.

  A brick and a feather fall to the earth at their respective termin)ftxy/.cib4 lal velocities.f)cyi/bt x 4l. Which object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevat8;uwjfj-gh yw0 83lywor. The elevator is moving 8wl 0g;jhwwy-u3yj8f up at constant speed. What is the tension in the string?

  An object of mass m is hanging b82us3q + c gdsb.8,tigqaqhf3 y a string from the ceiling of an elevator. The elevator f bs33 .g+sqit2 ac8gqu, d8hqis moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding 6h/;b xrjsc04 knbhf9mmz11;(h:u:dlaon hyon an icy sidewalk is

  It's more difficult to start moving a heavy cartonq- (k kz 85gj /+vtmuwxy(kq law9:x7k from rest than it is to keep pushing it with constant velocity, becaut k k yq(vxk58ja9zglw 7kq-wm/:(+xuse

  A horizontal force accel7q9kp.fuks h1x t5q g+erates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain fhx 15. kqg9spqt+uk7 the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slide4oh 09d1 d0uvvafmn1/gn c,g rs down an inclined ramp at constant velocity. Thus we can g, nrag v 0vofn14duch1d 0m/9deduce that

  A block of mass M slides down a frictionless plane inclin5o6 iu(+ mlisied at an angle q with the horizontal. The normal reaction force exerted by the pl+osi ui6m( li5ane on the block is

  A block of mass M slides down a d,w2 5rr f4bgwmg2 nt3frictionless plane inclined at an angle q with the horizontal. The normal reactir34wtgf r25mbn w2 gd,on force exerted by the plane on the block is directed

  A block of mass M slides dob99jsacq d , e(nza-hom.+d+ uaj88u wwn a frictionless plane inclined at an angle q with the horizontal. The gravitational force is dir,e n qu8+odua9m(azw+b 8 -adhs9 jc.jected

  Two toy cars (16 kg and 2.0 kg) are released simultaneouf *6 )z4a2 r;ssdi, n5fcetzhlsly on an inclined plane that makes an angle of *sadih,)scz 62 54;rteff nzl 30e 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 appliedf9sr py+qhjm8o h 0sv7e)7z m6 to the object, and it accel+ hyez j09q8s76ovf7pm)mhsrerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of massqbk30g3f*c tpw67nr kxym2-j 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average for ky3fmbk6qc jxw*2 p0tn7r 3g-ward force on the car?

  Starting from rest, a 4.0-kg body reachesr r9qdfd ya+:ud5o9y*7k l0z bn+ozd- a speed of 8.0 m/s in 2.0 s. What is the net force acting on the boy 7 0zldn9*9daoqbzrr-+dk5 :f+ duyody?

  An antitank weapon fires a 3.00-kg rocket which acquirespd ekfp, lz0q*j2az)/ a speed of 50.0 m/s after,da*jpzkef) qzl2 p /0 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 2vp7p5kd* l 0(unxnf gs6 y;czv gwm+3push a 10-kg mass from resfxnglpsv;6dz g y+7u025n kmc3 *wvp (t,

  What is the mass of a person wlspvom qs /+91 tr o1t/wpr3)zho weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surfa gocdt na gd1atnm9 3.i-8ol3/ce of the Earth where the acceleration due to gravity i/tdm38ngoclna ag1 .dto-3i 9s $9.80 \; m/s^2$?

  An object has a mass of 60 kg ogp /vht3bo uy.y;7qrcpp:)h9n the Earth. What is the mass of the object on the surface:p/ho7 3 9cguty;qh)b pyrp.v 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, and object B weighs 400e9-fpb bzp3 a N on the Moon. The Moon's gravity is one sixth of Eartp3- bea9p0fb zh'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 rop9tu, .wfen7g/spf rw: e. Sue pulls with a 15-N force. What is Sean's force if the rope pg,fe9/ w.us w:tnr f7accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surf b)zj d43*hyes( 3 yep2*evtwqace. A force F acts on the stack3he ( be4v2*qyz)ysjw3d tpe*, 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 6x7n-rk bfv2m 5tpvz :an elevator. What will the scale be reading when the elevat mvbk2:-rp7vn xt6z 5for 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 p/ tn5uyq-jq+ 7/ zotvkg and the elevator accelev+ot- q5qnz y7/pu/jtrates 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 elevator. Ie zsif)1ery3lig:o*8 f the mass of the person is 60.0 kg and the g y3e 8sz*ro)1e il:ifelevator 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. On3j1rb*x n;4n7g 5dghc je9sj me force has a magnitude of 8.0 N and is directed due north. The second fornnem *jhrs4c x7gdj 35;g19bjce toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg restsi 2+gklf l4/ mxwl1;h :cjk5lm 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 +k2m14fk/l mcglx5;: llwjh istopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the f vyspw0;c 91eaj c6rx+latbed 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 r06a ccsx9e1 py+w;vjtime 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 j8+.yr1g d pkjqbiv mxkx4n4h09 7-xpm = 0.40 kg, what is the magnitude of thed9k4.pmv + bpr jinh7j gx8k1x-4xqy 0 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, whn yy93pv9 mm8 6q(5uus 0xdiczat is the tension in the string? (Ignore friction and them nm8dyp9c3uvqx6 i sy09zu (5 mass of the pulley.)

  A student pulls a box of books on a smooth horizontal m u:t );28/ rpcedb:3syggpopfloor with a force of 100 N in a direction m) eps8 ;tg:ppuo b/rcyd3g2: 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 4 0thqdd3.mqq floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and th. h4tm0qdq3dqe books is 40.0 kg, what is the normal force on the box?

  A traffic light of wei:x c(t+ xnyq4mght 100 N is supported by two ropes as shown in Fig. 4-2. What are the mq:x4 xcn+ty (tensions in the ropes?

  In Fig. 4-2, if the te 1j;t+cr wfnmu7r(8v unsions in the ropes are 50 N, what is the mass of the traffic ligm+8ftwjr7nvuu;(1 rc ht?

  Two boxes of masses m and 21ixkio7lgy:nr p98ki5( hj9 im are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more 7h 1 :ni9ilkx y (ip98ojg5krimassive box?

  Two boxes of masses m and 2m are in contact with eachqed s83-il g33,r r;bbfj sul; other on a frictionless surface. (See Fig. 4-3.) What is the net force on thelj srrs,8dbgu- e33; ;iblf q3 more massive box?

  Two boxes of masses m u3 ds68qc8dmqand 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, wh6qm8u3c s 8dqdat is the tension in the connecting rope?

  Two boxes of masses m and 2m are conn: e6s3o8y0lhfeb3d h wected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, wh:wy68bdheol e fs330h at is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-55 qv *0r tukbh;j6pcjb :v)sy3. Box I 5jtpv)63jsqcy*0v; h krbu: b 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 kiy6a nz x;)mp.rgo)o54t) eghxr /f-+eyyyom4netic frictions 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 appli;rgp5mn ) aygy/o efm4rxo6yx+-4oe)yt) .hz ed to the box?

  The coefficients of static and kinetic frictions for plastic on wood arrxcp:65f gr/. jakqm b,z7n,,/vz i)nlwg h3re 0.50 anj:5zn3wr ib hza.7v)6nl qckf,r,r m/xp/g g,d 0.40,
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 +x direction. It slows and comes c7j/* ihyac0i;x.j 7ywwm/ xzto a stop with a constant acceleration owxx ;7h*y /7jiwyj/ z a.micc0f -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pullej4b33pib pum 4jo s0l8d by a 5.0-N force. A 3.0-N friction force retards the motion. What is the accelerat 0ilujpm3 s8o4jp b43bion of the object?

  A horizontal force of 5.0 N acce4;lw92u( ajx2khgs5 )a w lktnlerates 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 is8 t/gj *c*m w(5qksgfg3yb hka ,/xgt8 given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kin* xt8gc b,5mkfgsgqh8yw takj/(/3*getic friction between the puck and the ice?

  During the investiga i ,bk03k;fdwv;u+alo tion of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires a ;d,fio +; lkw0ubka3vnd 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.) The surface b8g eoakofb)tb .v6 -v1etween the more massive box and the horizontal surface is smooth and g 6ek)tb ofv-8 oa.b1vthe 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. (See Fig. 4-6.) xszt9)2-m yqc mt,n)v8 ,;rqgsg pj 3m The surface between the more massive boxj )n,qpvr q x,g3)ttscz m9m 2y-s;mg8 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 coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. Thggv.*vpn/ ) l0.0 arzyw4z jhse plane is inclined at an angle o. y n*0 ) .hvs4ggwzz0ajpvl/rf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hillfxl3+c*rw xyj-y)9 va 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 smooth inclined plane with0 t(8 ,sqiep;cqq-sqgpg-ho6f:; g xi eyk6 7v 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 plane t2/thi2v /t.yydaf3rfilted 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 gzzzs0t +qg, rnj70s,ned plane, at a constant velocity of 6.0zrz ,zq7s ts0g,+njg 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 gxb;qs7kjl/lc+ 4 j;kslides 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 scggg3t1e (e gx0pp(vi2q3lwb n7,*r llides 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 cable axfq0( 3el4 1urs -ymisttached to the log makes an angle of 0umyeq s3il1rf(xs- 4 $30.0^{\circ}$ 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 iba f s5mz9z:z0vi +m zc+x0;grough inclined plane tilted at an angle +mmz c0s0: 9 +g ixiz5fbazz;vof $33.5^{\circ}$ 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 9ggxzoj9t. p lmrx o((zo s9+-gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction betwee ltmgxsrz z99-g o9+(.j xo(opn the object and the plane?