Which of Newton's laws best explhmm d,bt iq(3pf93:w: l)aavcains why motorists should buckle-up?

  When you sit on a chair, the resultant force on y v2yr3m5u)1g8nxnvmofp qk 3. ou is

  In the absence of an external force, a moving objecbv:vj*kg.5 zb (c v+oet will

  When the rocket engik xyp/efq tjm3)*ho :;nes on the starship NO-PAIN-NO-GAIN are suddenly turned off, while trave*3j:)xetq /;fmho ykpling in empty space, the starship will

  A rocket moves through em;jfsmtzk8; 2x:d + obkpty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the f 8fk+k j2;;dxto msbz:orce that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and-p ucu +yv()cm:qdouoa6 ,vn* you suddenly fall forward. uoomu - :,yvc+(ca6) vndpu*q You can imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall9v d)vnjbld/ 8 forward asdv98vn bd)j/l the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the mo bty/y0 bpyld4k3 heq,0(*diftion of the object.

  The acceleration of an object is inversel ,r zwzipo+;x8* aod;qy proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net fktj88-mvs g g*orce is applied to mass 2m, then the accelers vgjm*t-k 8g8ation will be

  A net force F acts on a mass m and produces an acceleration a. 4uioknkyw1lt/ m i5y2y/(k x9 What acceleration results if a net force 2F acts on ma k/w4iyol1t m u(25/yk9xinky ss 4m?

  If you blow up a ballod:ekg:k c4, qfon, and then release it, the balloon will fly away. This is an illustrati,e4f:ck kqdg: on of

  Two cars collide head-on. At every moment during the collision, the mav +cx cqk9v4z4gnitude of the 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 avc xv+kc 9q44zn example of

  If you exert a force F on an object, the force wit c: mpjmdipr sf,7m9 +75q8ghich the object exerts on you wir:t+ifm,q8j79c5sp m gd m7p ill

  Action-reaction forces 9l8xnr5hh13ul *yo rhhr0dz)

  Action-reaction forcess fme c-81v95up8 pwttpri3o3 are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to thlc/8v+ vhxl8paf:e;9u:l h ere car. Since a lot of damage is done p xhhvr+8ce u9v/:;8l fella:on the car

  An object of mass m sits on a flatorix*jx9pk,tt1)iv u/ rsn ,* table. The Earth pulls on this object with force mg, which we will call t * )r v,xsxktnrj9 u*/p1ito,ihe action force. What is the reaction force?

  A child's toy is suspended from the ceilisnfko /g8,.u9dr9 vyang by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reacks a9 ug8rv9 f.,od/nytion force"?

  Your bat hits the ball pitched to you with a 1500-xa*:b.ed e 7 gcj6 f2u px2evhpu4)*haN instantaneous force. The ball hits the bat with an instantaneous force,6pc*7bfp dhxue u2e2ha :*4.j g)aexv whose magnitude is

State Newton's three lais3mw 5759ohxz)uzjud )w7 htws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon 6d9f1i,sns 4pthq9of than on Earth. Which of the following is true about the mass and weight of an astrona os i,sdnh99tpff q614ut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dis+v 8,sik:njbitance is

  Who has a greater weight jmebkwvx o: a*+k.0j) to mass ratio, a person weighing 400 N or a person weigjevj0 a)wbk:k* x. om+hing 600 N?

  A stone is thrown straight up. At the top of its path, thezd:qnri4fff .ll)bzty:t q9/zh0 51 z net force acting on if nb iz1 z4lzh. qyl05ft:q/: rzt9)dft is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from uj( htlqeahh g3+e 9:5the same height.+9get:h(haq35j ehu l Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the hg p60,09yp-dxabh oc x9ixueo2i4d;earth at their respective terminal velocities. Whicbxx9o0 9cedoi4gp,i;62 - yhha dxup 0h object experiences the greater force of air friction?

  An object of mass m is hanging byq7cyrv cs4 m58 a string from the ceiling of an elevator. The elevator is 4rcq5 s8v7cm ymoving up at constant speed. What is the tension in the string?

  An object of mass m is hanging beb)lw4e6b,npv)9y 1 y+gjqrly a string from the ceiling of an elevator. The elevator is moving upward, but slowin 9b4)q6ew), jyv l ngye1p+lbrg down. What is the tension in the string?

  The force that keeps you o7m smad3z-getvf58 4 from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is too:t a0nhr-,br x-.gc0zumgm; keep pushing it with constant velocity, because0n tczmx -:.b;ru-ghgora 0 m,

  A horizontal force accelerates a box from rest across a horizontal surface 3ujqok -r94qi(friction is present) at a constant rate. The experiment is repeated, and all conditions re- o9kuj 4rqi3qmain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined r5*,.r qahgn x0bvppre -5;u f ,w w7lpjgkgv3;amp at constant velocity. Thus we can dedurn.wr; f p5uwg-0vg 3,,jp aeqlk5b vhxgp7;*ce that

  A block of mass M slides dom1d d;gi o2n4y dir-iq8ln4w+wn a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by thein oiq 2g; 8d-ld +nw4myrd14i plane on the block is

  A block of mass M slides down a frictionless plane incline2mj3ox(hw15fgg ( ,by3ylbao d at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is di(ggfw ,53jym lo (x3ba 2oby1hrected

  A block of mass M slides dg*p; 8uipq v/ig7 +fhnkv9-mn)z dur/ own a frictionless plane inclined at an angle q with t9)v ;mzufgrk pnp nidgu-h7 / i*8q+v/he horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are r,b 8.yhpm(bqu m /n9obeleased simultaneously on an inclined plane that makes an angle of 30e with the horizo 8/bm( up,o .qybh9mnbntal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is aphe /jrgp5 d yl5kfe-m+.,idre1z3x , wplied to the object, and it acpzdegd5, f w3rj r/mxl-e i,.k+h 1e5ycelerates 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 27 m/s in 7.0 s52:bo5 nih oqn6mi9d8:ck7 ;o ujy mgl. What is the average fcm;:m hqng5b8ikd:o o9u6 i7yl2noj5orward force on the car?

  Starting from rest, a 4.0)b.g ,/ :ly9tyup 75hoh23( mkw tgprf ib)dxt-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force actpl 9otu)yht5) ghpdm73 rbibt w/.g(,xyk2: fing on the body?

  An antitank weapon fires a 3.00-kg r-0z rjkmx i64wo9 7cxlocket which acquires a speed of 50.0 m/s after travelw794 -xi0cmkjo rxzl6ing
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 forenp.7 drek22k ce that you push a 10-kg mass from rest,.e72rkdn 2 kpe

  What is the mass of a pertzckp-z 3)( s,y )u67glftf kason who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the v66kdo i51t tlh76yj.qb5wvrsurface of the Earth where the ltv7o tvwb5j y166hk6.r diq5acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Eao(+-f *cc syrmfrnx8q 4w5, mfrth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earcnswr o ,-yqrfm *c85xmf+4(fth?

  Object A weighs 40 N on Earth, and object B weighs mjc.z*p- u*kezav0m( 40 N on the Moon. The Moon's gravitp* cu0ae.mv(z z-*k mjy is one sixth of Earth'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 x* 1ze-v:r( n:ilwdjlv-b bw+rope. Sue puvw - + xw:v(be1l-ndbj*r:izl lls with a 15-N force. 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 surf.eem2xajig eg-2 as 1:ace. A force F acts on the stack, and ie e2-ajg sa2.i eg:1mxt 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 an elevaqk4mmmg5 ag,/ t e-q:rtor. What will the scale be reading when the elevator is accelerating downwagq-a/g 4e mm:r,5kq tmrd at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If thes zfg;+z ; ma5houv2h8 mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration of f;;ahsz+hg 8zmu2v5o $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ro pdu9x5,d:a ot yl-52qwv,or ides in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleratidow2otlx,5u,-oa :d 95 qyprvon 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 magnituxy e *+.1:gr v:pespdhde 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 acceleration of the maepshdx: v g:yp. +*r1ess?

  An object of mass 6000 kg rests on thaht3uk1 3holhow5o+; uko.-m e flatbed of a truck. It is held in place by metal brackets that can exertk3 -1lt5uoh o.;3hko ow+h amu 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 held in place8 o9q3m:ak5sw4whto n1tup v6 by metalo4uw38 k:p95w6t v1hn soatmq brackets 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 ar fx a( .k7mmgyo8 9a6pd,y;fand m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore fri6aam 98o7mp kf.;fry,dg(yxaction and the mass of the pulley.)

  In the Atwood machine shown in Fig. vhg: r. izuwuvw1;f;24-1, if M = 0.60 kg and m = 0.40 kg, what is the ten vhrwug21u;w iz;:vf. sion 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 ot 44s,kr ,egt fr/n:qqf 100 N in a dir 4qr 4 e/kq,tsgtf:,rnection 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 horizontalq 9qe,*8 hqt 8hzf lk+lzeki10 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 f9qe0 8t*1ezi, +l8 qhz lkfhkqorce on the box?

  A traffic light of weighthjq d-sm-t9 y*9*v qv0zpf1lb 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the ro-vt19 ph *9bq jyf0*dv-sqm zlpes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the t.hot*:zd1qne raffic*h.zdn1 q:ote light?

  Two boxes of masses m and 2m are in contact with each other on a feft)mvv, flikk y4iuqd+;98+rictionless surface. (See F kqy k,l) 9fivmv4+etdfi; u+8ig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 3,kohpj,3 *zo1 fryuq2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force zpy,hkf,3*r u13q ojo on the more massive box?

  Two boxes of masses m and 2m are co9z2kz+56z9z wwzi fdw u2/glonnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is thez 2/+ gozl2k569 ziw fzwzudw9 tension in the connecting rope?

  Two boxes of masses m an71v9 (hjqfyhz1gy j9atgp7 9dd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the accelertjj919( ygy7 hvg971z pq dfhaation of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in F)t vmrtty-; z)ig. 4-5. Boxtz mv;-)ttyr) 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 an:;7q8)waycwybl k3k c d kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on thelkk 3c yq8wb)a7;w:c y box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions forurhhn4m,-.y 2zb 8sp4m.ksko plastic on wood are 0.50 and2 obz- ynmk.8hk,s.ru 4pmhs4 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 slowsijp2t 2c;z9,*amser,ir 9jm2rzl f8n and comes to a stop with a constant accj2ai2m8, j;p 9zlrz*,rfcnti mr 2 se9eleration 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 horizontal surface is pulled by a 5.0-Njd 9 4bok(u9 58huh2.-ak6 k69ztf vabh ildgk force. A 3.0-N friction force retards the motion. What is the acceleration of the objecui dlaa56 h2gvt.h9ouk- kb9k (d89 f6zbhjk4t?

  A horizontal force of 5.0 N accelerates a 4.0-kg massxi-)8w no 4rmhx5 wd*p, 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 cqc ;*t fjfj5sorwg4-//lp,cy:e6s jspeed of 10 m/s. It slides 50 m on the ice before it stops. jswqfsl5cc e-4, j jt/g: rpf;/6oyc*What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic ac+jli,eej;2 o2s2)sbwh zg-m mcident, police find skid marks 90.0 m long. Theywj) jzimse2 2h,2 lg-be+mos; 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. (See Fig. 4-6.) The surfacci adlz6s377b gaeqz:4i*c+se 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 thac+ is za: b3s*74ileg67qc dze static friction force on the less massive box?

  Two boxes of masses m and 3m are stackvb 334a65bo+ifn.yxxuwv5vv2bb ot .ed. (See Fig. 4-6.) The surface between the more massib3w +62voabuo bv4.vfnvx5y53x b . itve 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 inclined plane. The plane is inclined xw/hce*,nyy,v0k5a rbw* da+at an anglevwc** ykr ,xh+/ny,w5b d0aea of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that67wgf;es/uwswh 26q g sw/u i/o6v4dh 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 dbh h k 6*w 7/3r)p-fxbcclaq.a 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 inclined plane tilted at an angle oftvz.yd r(:)lel2(*a vc u oqx0 $35^{\circ}$ 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 vel5 3thgic8ve1m ocity of 6.t138m i egch5v0 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 slide vs.tczr/y,z 1s 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 mas 8vuip2rcw(som (ul5j1x 9uu- cu/oj;s m 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 along a rough surface. The cablq4p+3 m7yws gnn8c0hp qr 00xie attached to the log makes an as qq3prn48h w pgi+y x00mc0n7ngle 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 aoe.s) qi*d oq1ngle sq.*iqd e1oo )of $33.5^{\circ}$ 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 inc+cquzuc* k,ulpm, f0 4fbx68bline 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 and the plane*f4uf zc bk b+qmu0 ,u6l,x8pc?