Which of Newton's laws best exivuwu,, kec6v0 u+5 qa2p9 +xh2wlxnuplains why motorists should buckle-up?

  When you sit on a chair, the reso g5)osagb( * 0q3vpbya0af7 pmg7l)tultant force on you is

  In the absence of an external force, a moving obg+ yk-k r).h(hul ju5pject will

  When the rocket engines on the starship NO-PAIN-NOxk s- :mf9f6n.hd o7e.nsv1mi-GAIN are suddenly turned off, whi.s fdm7oi1nv h e6:n-9.sm xfkle traveling in empty space, the starship will

  A rocket moves through empty space in a straight mhb1ny9) :2wvexv+thdkv y l:c,b) j (7 lwqa)line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applie:+wqvb7 ly xv9ed):)an,w 1hjylv(h 2)kmbtc d to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you sud8-lb6h rzv 5i d ya1ngl w-.jv;jeds59denly fall forward. You can imply f.vv-ih ead9dnzw1b g;5l5 8lys6- jrjrom this that the bus's

  You are standing in a moving bus, facing f9baa eigw.*okn hq l-zli md7uko,5t (/mf 6./orward, and you suddenly fall forward as the bus comes to an immediate si owz.*mf la.l d/n, 6e iag9km-th(ku75o/bq top. What force caused you to fall forward?

  A constant net force actsrg smb7jwby,u2f6 l6vb5lv; 2d5a ;nt on an object. Describe the motion of the object.

  The acceleration of an object is inversely proportixy3zqv4y v8h(+z syh4onal to

  A net force F accele taf331 8 q4,+j1x wvsp2fz(hik pvohvrates a mass m with an acceleration a. If the same net force is appliedf8pv ,iax2j31+ 3p1okw v(hh zqtfs4v to mass 2m, then the acceleration will be

  A net force F acts on a mass m xoqjygo fheb ;)4r,ti 6ctl;s60d/ 0t and produces an acceleration a. What acceleration re tslbjie r,y/)dotf06h0x q; c4;6 tgosults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release itk) 6adc6q u2rrnzzx48p::whkrv m)/yzk 7 1mi , the balloon will fly away. This is an i4umzz86/)a1r r:nyz v:rkkmwhcdp q 62)7kx illustration of

  Two cars collide head-on. At every moment during th pz4/ n*e;tcdve collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the for et4dn*p/ z;vcce the second car exerts on the first. This is an example of

  If you exert a force F on an object, the force zx 7f6wdt wex8)ps y -qcigbq /d5086qwhich the object exerts on you wil5f-t s 6i xw)q8xz67cb 8epqyw0gd/qdl

  Action-reaction forcebinw8 )4f u)lvhge9v2ez 4m+js

  Action-reaction forces ,po ess(s m)ln6jv)g5 are

  A 20-ton truck collides w* 9 /2fn wpn r9jse;ywtq5vi0eith a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the carn;tp0j /ferqvi *s yw92ne95w

  An object of mass m sits on a fn6zm rzdd5,liv-j+ : hlat table. The Earth pulls on this object with force mg,nzv-, di5hj rz:dl+m6 which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of ys 4les+( j e:4ukcnz1a 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 "reaction force1 sn:4czul4s(e+ jk ye"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous f9opa zbf k)ms:l6) )n6jsn w 3yrhqn92orce. The ball h 6 96rnynb9:hfssma3o))n ljz2w k)qp its the bat with an instantaneous force, whose magnitude is

State Newton's three laws7 a)g4tow56.jfi) qggebzl k8.

  Mass and weight

  The acceleration due to gravity is lower on t;s 6;b7s em o k;v sddqt9n;p5tysk27vhe Moon than on Earth. Which of the following is true about the mass and weight ofvst sn7k97y2e ;v; o5p msk6dbq;td;s an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts atls 9tpk qx e)7ug)-n1l41obzj a distance is

  Who has a greater weight to mass git 6j3q*zo 4)l kc0rkratio, a person weighing 400 N or a person weighing 606kkciq rj0g)ol* 3 t4z0 N?

  A stone is thrown straight u95 7sm7j,swlbeb8th/2vz s ofp. At the top of its path, the net force acting on it is, /2 lzjssvbfm ho8t59esbw77

  A 20-N weight and a 1 5ge slqs;bjmgg4-z4 5.0-N weight are dropped simultaneously from the same height. Ignore -sg ;4z1gem5qsj l bg4air resistance. Compare their accelerations.

  A brick and a feather fall to the earth s s/k ;wzs*:n*dkes 4zat their respective terminal velocities. Which object experiences the greater force of zz*wk*/;: sseds ksn4 air friction?

  An object of mass m is hanging by a string9cypj,j).evo*.cihj from the ceiling of an elevator. The elevatorv.e,jy *.och) j 9cpji is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a 8a vuo0axs31ustring from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is8a v 3us0oua1x the tension in the string?

  The force that keeps you from sliding on ;. fsachaxw0 ,an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to k ym3 m4vns9d9zeep pushing it wd4 mzvs3y9n9m ith constant velocity, because

  A horizontal force accelerates a box from restx7k s k/k,ux4wmfx f4/ 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 doub4m,/k4k/wku xsfx7f xled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thdx5l9 (tm-eda1.fnj b(7vvwh us we can dedd(7l-vf a e9.jx bn w(m1tvh5duce that

  A block of mass M slides down a frictionless plane inuu 6qcy s-x:-yclined at an angle q with the horizontal. The normal rey u-cu:6yxq-saction force exerted by the plane on the block is

  A block of mass M slides down amst a/t*+o ; pa mace:i 8/nxe9 h(q4mvtz.gf- frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is direqg-:9i*8+nt( mte;/ct4x/ am.po shafemza vcted

  A block of mass M slides down a ;a-b+or pz iav4- .kwwfrictionless plane inclined at an angle q with the horizontal. The gravitat4bvro+ i w-.-a;akzpwional force is directed

  Two toy cars (16 kg and 2.0 kg) are released simuo:q3u .aor c,bl.k.zrltaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes r,ou...brc l3q :zak otheir acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied 8fqjqa ; ,zt:dto the object, an, z;j:q8tadfq d it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of massqmq,,4bhtc d 5 :b 2*g6lgvenlwlc3:j 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is th4:vb eb* :htl 2q 3g,wccjm q6,ldln5ge average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a f ,h2tv;x)c4 ad/g jcfspeed of 8.0 m/s in 2.0 s. What is the net fort,xagj4h)v;2 dc fc f/ce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which ac4;i lbk a u ry8penl:n fvejcvq84n8)-(+and9quires a speed of 50.0 m/s aft: n4 kpae8c;-nl9)dbiquvljvn48nr8e+f a(y er 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 samx* pbse)28zed e force that you push a 10-kg mass from res)*xe8 bzpse2d t,

  What is the mass of a person who weighs 110 lbgd3ixou :o/g t/3g :ma?

  What is the mass of an object that weighs 250 N on the sux7 :;e 6bn)ig3gqgjpn rface of the Earth where the acceleration due to gravity is gx6 )p7nb3iqggen;: j $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the masszbtypsjt4078l( ai: ox5ef xfuft3o6;q /3l o of the object on the surface of 3z t;(bl upf4txil3 j/sfe8ofy6a7 0q:t5oxothe 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 40 N on the Moon. The Moon'e.w wvr-j2f ms9y3d ,ms gravity is one sixth of Ewyv3 md 9w2, r-f.sjmearth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by puldy:ab1*roh. lling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates thlrd1y:b.*a ooward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionlj4i6+ wz c+(5rmm isnness surface. A force F acts on the stack, c zinnj w+5+4m r6ims(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 -lc/t a +y1ly85,yxzvwp yu/f stands on a scale in an elevator. What will the scale be reading when the elevator istal 1,-x zyy/y+/vlpu wy8fc 5 accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides0gd6 jl*5 kgcz in an elevator. If the mass of the person is 60.0 kg and the elevator acceleraglk*6zd5cj 0 gtes 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. If the mass of the k3gb fk24q+gdd8x0cj1yu,b 2qo jz *aperson is 60.0 kg and the elevator accelerates upward with aqkya 3b1 xucqz4 ,d0oj2j82 b+gk *gfdn acceleration 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 magnitude of 8;9q qksswk ;d1p8,ehs .0 N and is directed due north. The second force toward the east has qqkd1s,pwek9 ;h8;ss a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kb9p:ylio 1aolmtm7 f0(.qwuz ux5;o ox -3 t.ug rests 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 stopping distance if the lol0fa . otzo5 ul:w omuxu.1x -tb7m;3yiopq9 (ad is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held inh9*m6qi;73bd:noyvuul- is v place by metal brackets that can exer *; 6qubmis oyv:vlhun9id 73-t 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 machini,p6u,:dtpo esr:z* hr5zd y)e shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the a*r,:t ,6u)oz 5s hpzipdredy:cceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1,n,evcj: j g5 ly ,h7hyul;.q5k if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the7j5.;,yn u, cjhl:e5l hvy gqk mass of the pulley.)

  A student pulls a box of books on ah-y5x r(ymj:a :sdmx: t/g7hhe*/ysj smooth horizontal floor with a force of 100 N in a directis/d x *:m:-r/h emy tag h(x:sy7hjy5jon 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 smoottzu spb7j ;ka4ly;3c3cz6, oo h 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 4 b3uz;z6, osykcap7oltj;c3 normal force on the box?

  A traffic light of weight 100 N is su 8nn;t9a4eaqupported by two ropes as shown in Fig. 4-2. What are the tensions inaea u4;t nq89n the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N,,gkvh1 cnas b8v k3*1b what is the mass of the traff cgsbk1v81* vk, habn3ic light?

  Two boxes of masses m and 2m are in contact with each other on a frictionless sk k2b6kd v9s9oqv,3hkurface. (See Fig. 4-3.) What is the accelerak,hvs63 92dkq9kv bko tion of the more massive box?

  Two boxes of masses m and 2m a8qsa a-fy (i2ere in contact with each other on a frictionless surface. (See Fsq y (if8-2aaeig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a r i1muhe. 2+5ky q)cauoope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the t1kuia 5)ue 2c. yh+qomension in the connecting rope?

  Two boxes of masses mhy/idq i 4qk ,3k)gpb/bfpy8 2 and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less 4 8/b /,phgd qqby2fpi)ki ky3massive box?

Two boxes are connected by a cord running over a pulley as shown in F6s/pdw t y,f32ki nlz e 6ul5f/(db9uwig. 4-5. Be 5l6z2 wsdnuf/,36 ul(9/idtfpwykbox 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 staticwfr,6wk sccv q/89dw . and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net fork6vfcww. 8w /q9rc,d sce on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictio ;pa mq 38q-tg)m13uhdbjryk)u-d0vfns for plastic on wood are 0.50 and18hd 3f )baym -r -mdk0v3 gqjt;uqpu) 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 comeipe g/hb)2kl ;s to a /b;le 2)pihgkstop with a constant acceleration 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 byck vr w3 pv:z3gy+.07cxv: gwz a 5.0-N force. A 3.0-N friction force retards the motiv z:z vx0+c p3 g.w7wr3cvyk:gon. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rate of g dy*2,w( ;1i2ma gsglzi5f uw$0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initial speed of 10 m/s. It slid,n6b 2*6es41a; kdbh jijjotb es 50 m on the ice before ,14hj 6bd6;kj ojebn ts*2a ibit stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid m; zgxnrv 1c*/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 z*m r cn1vg/;xof the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4v1 iow /cwib1qd, 1/dw-6.) The surface between the more massive box and the hori i,b ddw//qwvc 1i1o1wzontal 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. (See Fig. qv7,e o)j.jyn 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 coefficient of static friction between the bo.j qejv7oy)n,xes?

  An object is on a frictionless inclined plane. The plane is inclined at a:yi u8sw2zh)hn angle hu h2ywz:) si8of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mv+ .bf)at skc84m50zejtv7ln akes 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 with an angl7 -)iy zkdykd9e 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 lqidzz /i frs5fs. ; ,d,h(:txat 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 velal;dx w/g:/lfocity of 6.0 m/s.wl /lg;dx :af/
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 sl.ol hc*4+jaoqg0 3rtlides 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 rouggvqgibge 9 e z+2opp+2)sk8 c)h $37^{\circ}$ 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 a)nsvh jkg66: b/ logly uu8)t1long a rough surface. The cable attached to thujs l8bnh o)1lvg)6u/ty :g k6e 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 ry0au7 hpp) (uhh-x. ginclined plane tilted at an angle ohgprxy -phuu7 a(0h) .f $33.5^{\circ}$ 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 kwkfh3 h6nd8o mr)mzh-4rm 3pq 3s2y.an inclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is h.p6zmm 3-ho43 r8qfns2mhky)dk w3r the coefficient of static friction between the object and the plane?