Which of Newton's laws best explains why mottt0;2txfe (vh- yy g9lorists should buckle-up?

  When you sit on a chair, the resultant force on you7fg od9wj84rha p9c k1 is

  In the absence of an external force, afxu j:thiy gu x8-+8qpflg1.kf +4c.e moving object will

  When the rocket engines on the )e w z(xdb3qg(wh,m v0l4z.hq starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty sm0z q.( 4 wew(,xdzbv3qh)glhpace, the starship will

  A rocket moves through empty sngaj;.b , f)vmpace 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)jma f; .g,vnb be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fftxqf.)(uv- .mc x2tk all forward. You cvx2)- u qfttx.mfc .k(an imply from this that the bus's

  You are standing in a moving bus, 8i fb4p by2d5hfacing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forb yb5fi24h8dpward?

  A constant net force acts on gd tdo x. 7+zt*51rrznan object. Describe the motion of the object.

  The acceleration of an object is inversely proportionkra1h2r mx4inn ;.qy-al to

  A net force F accelerates a mass m with an acceleration a. If the same net fo 0 5zp4p2do oso3uk5knrce is applied to mass 2mop2po5 nk45u z3o dk0s, then the acceleration will be

  A net force F acts on a mass m and pr3x:gb *h wq4 1* mwsz7hs;vtvloduces an acceleration a. What acceleration r; shv s1bm*zhlww4qg *:7t 3xvesults if a net force 2F acts on mass 4m?

  If you blow up a balloon, z:ggf/( bkw7s and then release it, the balloon will fly away. This is an illusg: (gskfzw b7/tration of

  Two cars collide head-on. At every 65brohfbk-,z-2 zy kvmoment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnith yf56v-kzb -b,o2krz ude 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 :(*t zf riij+j,ats:, jzkww2 exerts on you wikwrjjt:2+(: sf,za,iwizj t*ll

  Action-reaction forcesoc1f:0v ahvk15 w1ku*ewy qg*

  Action-reaction forces ar m1: 8 pgp7avtaif+r)gte9/ 4y1ozsjde

  A 20-ton truck collides with a 150;h8 zscjz6l / x3orn;o0-lb car and causes a lot of damage to the car. Since a l38x oc r sn;j6zol;hz/ot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pullsk ikrr6:e ay8q.gj :g ;+*ioab on this object with force mg, gjok:y :gqk6 r * iriabe8.;a+which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a srdm 7*qzfr ,;cnt20og gy(xv +tring. The Earth pulls downward on the toy with its md,7*qtyr + nv gfc;o zxg(2r0weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitchi oy (+i9p+jag sts6;red to you with a 1500-N instantaneous force. The ball hits the bat with anpia9s gyr+6t isj ;(o+ instantaneous force, whose magnitude is

State Newton's three lawsc4w4bemku .f +(w wpo7.

  Mass and weight

  The acceleration due to gravity is lower gub8x4uo m;)pxf 3n4s on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Eaus4n ;of3upm b4 g)xx8rth?

  An example of a force which a4( 1srsrz +qbjcts at a distance is

  Who has a greater weight to mass ratio, ame;/w/bkq(: 4 j ubr7rxr ma/ /uid1t3,w kyya person weighing 400 N or a person weighing 600 N?kuwk:eb; /r/, am( qr/13 4 amjr/ tdwixybyu7

  A stone is thrown straight up. At the top of it4ub9-v vl zxv --odc;as path, the net force acting on it isz-cxvv d9a o-4;- bulv

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the s 8(w6 t3n0liut.i duflame height. Ignore air resistance. C 6tdlt 03li(w8uufn .iompare their accelerations.

  A brick and a feather fall tw-g .n xwv5 ak0thuo:.o the earth at their respective terminal velocities. Which object experiencesxg0wu n.a 5kthwo:.-v the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling0kw )k-euui 4d of an elevator. Thek4e0wiu- ku) d elevator 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 m.sva6l jxk8 -of an elevator. The elevator is moving upward, but slo.jvk-x lms68awing down. What is the tension in the string?

  The force that keeps you from slidingb18p9sdy* ih vo9f*skc3h* ug on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than p:ns2g .o-gio t x02qait is to keep pushing it with constant velocity, bgoxp2 n:-go s0i qa2t.ecause

  A horizontal force accelerates a bo 6i7oio b:bskpe4;az8lz .9wyx 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. What happens to the box's ackwza7.ibp9eb 6olsz: 8;y 4oiceleration?

  A packing crate slides d(s/:m 4lqxe bzown an inclined ramp at constant velocity. Thus we can deducee/sl( z xqbm4: that

  A block of mass M slides down a frictionless plane inclined ath lv,hxd eomr1m,84u( an angle q with the horizontal. The normal reaction force exerted by the plandh(m,8r vx1houlm4,e e on the block is

  A block of mass M slides down a frictionless v. lyh ml8;4,emlhskc9vt07h plane inclined at an angle q with the h7;9h4m .,vc 0klvtshlh me8 ylorizontal. 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 witalndvb 8)4ogaxle) -5h the horizontal. The gravitational force is on)4a e)dgx 8 valbl-5directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined pldk-r a/m6qns8ane that makes an angle of 30e with the horizontal. Make a n q6a- dsrm/8kstatement which best describes their acceleration after being released.

  An object sits on a *amkoml+t) 1wn 8u 8wifrictionless surface. A 16-N force is applied to the object, and it acceleraw+loin tm1w8)u*kam8 tes 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 eh5g.ru vy+ 3,v 0bray27 m/s in 7.0 s. What is the avraeu ,vyy30g5vbhr+. erage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 +u m4+go6r+* ghd-n7 o seijympb-+zqs. What is the neu-*+p mi+mgz -+6yh+jb snr7eo4dqogt force acting on the body?

  An antitank weapon fires a 3.00-kg rocvbz;pf(4nu wy9j v1;k ket which acquires a speed of 50.0 m/s after trave z4; fnvvy1 wbup(k;j9ling
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 samel4ti(lx k(,e8bw8 pvp force that you push a 10-kg mass from rest,48i,ekxvp( p blwl8t(

  What is the mass of a 3lkl, :bikljox g7 6*wperson who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Ear xtl(g*dmu ql17 ptv+6wf*kmhv25 x*v th where the accelera tvpm 75x*k( gth*mq+v6lf*d2wxvl1 ution due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mauq liuzf2*t obr6* :6ess of the object on the surface of the Moon where the acceleration due oefbtzu:q6lr 2ui6* * to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N fb o6nwlkbs-/i z w dn(7m )h+4u,my*don Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth /ysn *lwmmw ,7o-(k6u4d)fbhizd b+nof Earth's. Compare the masses of the objects.

  Sue and Sean are havingfll:4x w39 htd a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's fod4 lf :9xwhtl3rce if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level fric7w:t 1v 4zhwhltionless surface. A force F acts on the stack, and it ah7w1lv w:zh 4tccelerates 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 :)jqrw .h:tzifm 7 bh g259wsywill the scale be reading when the elevator is accelerating yih79z2b rhjf::gs .)wm5w tq 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 kg osvy))(pt i m4and the elevator accelers py)v(4ti)m oates 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 elevatk4 )t5lwxrvb3 or. If the mass of the person is 60.0 kg and the elevator accelerates upward with an accelerationrblt) 34kwvx 5 of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5. o-t9rw (( s*gp j)9ah,bkqdr9oufqm 50-kg mass. One force has a magnitude of 8.0 N and is diraqjpt9r9-d9h*uk()mgb5 s(oqo w, rf ected 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 6000 kg rests on the flatbed of a truck. It is held in playd 58e u34uh xh4vdn2xce by metal brackets that can exert a maximum horizontal force of 9000 N. 32dnx hu8 h44 ue5xdyv 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 zrotsgl4c+g g0e-i ; (tf.4o aof a truck. It is held in place by metal br+g.4aizcrte4 (lft0so;gg- oackets 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 kg, what is,qe08du iv-el-usiq6 the magnitude of the acceleration of the system? (Igdeqi -vls- iu,qu 0e68nore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig.)s0 5 kzyhs5zmk.abwlq3a0r0 4-1, if M = 0.60 kg and m = 0.40 kg, what is thea5rs5.0y ks lqzmw3z ak00h) b tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force op,l+);dlfb me f 100 N in a direc)l,d+p bf;l emtion 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 wit30elkx*67s,cg s ovk q-b kh3)ybez 6bh a force of 100 N in a direction of 37.0e h k0, bey66szkqc s- lb3k)v*g exo7b3above 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 two ropes as shown in Fig. 4-2qb6w1ua,gyv l+lje*4/a o( fq. What are the tensions in the wa4 , f*evq1yq j/gl( 6lu+oabropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of thnpw 8 sr(4v4mges wet6 (h8a5ye trafficesr ns4tg e84 ma( vw8(6hywp5 light?

  Two boxes of masses m and 2m are in contact with each o 5 w kvgn.bzcqbs j,3r9ht,s03c5nu*ither on a frictionless surface. (See Fig. 4-3.) What is the acceleratiowz3.cugbnq35tck 0v,j iss 59rhbn , *n of the more massive box?

  Two boxes of masses m ke2zk+xf4l22qbg g) c e7(jfztg .fy2and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What( ycgkqjt2zfzf2 .e +2f47 lk2 ebx)gg is the net force on the more massive box?

  Two boxes of masses m and 2m are conne ,kyuunw xkep) vh+2/,cted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the +k, u)wpun 2hxkv/,ye connecting rope?

  Two boxes of masses m and 2m are connected by a ro7t1 4ptfnzb/ 1xvz 30 z)qbbcepe. (See Fig. 4-4.) If the forward force on the more massive box is F, wh)3fp en4x1z7t bqvb c /z0tbz1at is the acceleration of the less massive box?

Two boxes are connected by cdlcf,apqj1oak 9(rfffsg9 4 -u:73t a cord running over a pulley as shown in Fig. 4-5. Box I:,ptf k9f aca cql-1rjs(43ouf f9g 7d 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 frictionsm:duth e2u66nby:4tw0 arday qu. .5l between a 3.0-kg box and a desk are 0.4 :ant u.56uu w l6dr0 .:bmy2hy4edqta0 and 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 wood 2 /ra7dcs6nnd9p,sww are 0.50 and 0.sw9, /c sn a2pr7dwd6n40,
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 r9x5w f3-g ifcubg7( ito a stop with a constant acceficgf9ub5-ix r gw7 (3leration 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 horizonta)xpev2/1t dxjl surface is pulled by a 5.0-N force. A 3.0-N friction fot2 x1x)pv/j derce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, foazm,u)i8;/ ij1rawut0g( 4ald7fj irom 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 initialqw r2ectz3e 2h 35p4z2k w(qow speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic fric3qrwz2ok2 c2w (zeh53q 4tewption between the puck and the ice?

  During the investigation of a traffic accideak9q *us;vt lj *msx6:nt, police find skid 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 whes*aqj;6 9txk:s*vm uln the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fiwgx b9mmee.1o ;yr0: jg. 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 jg 1o; 9:r.me0ybmwxebox does not slide on the more massive box, what is the static friction force on the less massive box?

  Two boxes of masses md+te l: oi.ib24(ztdo and 3m are stacked. (See Fig. 4-6.) The surface between the more:ile bitd4+odot.2( z 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 coefficient of static friction between the boxes?

  An object is on a frictionless incjcrg h6dc7 g 2o/nz*z)lined plane. The plane is inclined at an angle ocrgz2ho)n /gd 7c6jz *f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a fl -0 qswbp5mm3f r2om6mgh) ai.at 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 smooth inclined plane withfg+s0dzsqmch+o;nc 14v: k9f 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 tilq;dy u1 oc q8cj.xt4a/ted 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 incline*lci2g fg 5:zzd plane, at a constant velocity ofi5 2g*:zfz gcl 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 s3 4ph) p8h 9w8.wwc5fvvrgblalides 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 agb1 yf-uc esx8h76.ucn: cyj/ 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+1 wohjkj+.dj weighing 500 N along a rough surface. The cable attached tok. jwdj1++ojh the log 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 tiltedhr qy6je+ ;l 0qbtix;8 at an angle of;xel+ry6;h qt j8 qib0 $33.5^{\circ}$ 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 gradut+faf/h dl/ 5zally increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static frict t+ 5z/ff/hdalion between the object and the plane?