Which of Newton's laws best explains why motorists shou*y4(;tfwqzxc y h+4h/q4 r*ox9bsv pald buckle-up?

  When you sit on a chair, thkci;tgdga ;b -e(v4 0xe resultant force on you is

  In the absence of an external force, a moving objecm27 jggyeel0w 550ba ot will

  When the rocket engik*)(3*e.1mt4u p0g ygza(hz,dqgcb1enyu w fnes on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space a) gb(uf0*(,g3kuzmgty.he 4d1ce ny1q zpw*, the starship will

  A rocket moves through emptyu 2 ghkbjkt 9g0;;wi)i 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 tot gii2h0kg) w9jkub ;; the rocket in order to sustain its motion is

  You are standing in ai/:zlg wff ;,s6yia80tqg5jt moving bus, facing forward, and you suddenly fall forward. You can imply from this t z658;lf ytig/sq0 fw,tjgai :hat the bus's

  You are standing in a moving bus, facing forward, and you sudd z()mxj 6dzc(;y(fmq krkqsh7+woh +0/x* nnhenly fall forward as thh my++(do rkhnm)f 0wz6s/(7* kc;zx qxq (nhje bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. (qv7m;mv(s xrcren3) tuc 1 y6 5df9ry Describe the motion of the object.

  The acceleration of an object is inversely proporti4p 8-:, wbq fmph.gkvz1jko: conal to

  A net force F accelerates a mass m with an ac /7 s:wzlznopwn::7ilceleration a. If the same net force is awzp7lns oil 7nz:: /w:pplied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an accex68pry 1:,ceshj83s( xzl viv5w7 h tvleration a. What acceleration results if a net force 2F act,:ph8 z16itw x 8rs ye jshx37vv(5vlcs on mass 4m?

  If you blow up a balloon, and then release it, the ballhs0kacr00 u;lbr 6;pcoon will fly away. This is an illustration ol s c;ca kp0b60ur;rh0f

  Two cars collide head-on. At every momentbu8 y2z0 aixe4 during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of tha204bie xzu8 ye force the second car exerts on the first. This is an example of

  If you exert a force:gj2+t n7 r0,axdb3tw rui6 mk F on an object, the force which the object exerts on you willk 0 ,wa6mi2 3+jtrr:ugd7xnb t

  Action-reaction force 2u y,mvu; u6c3sj7q tjv+7sfpkyfc 0.s

  Action-reaction forces a w-:kp0nj1hf:sl ju xc4gz .1rre

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to;9(co bhj i0(xale b8v the car. Since a lot of damage i (bc(ixeo;h 0v9b j8als done on the car

  An object of mass m sits on a flat table. The Earth pulls on this objecefp85g+dw85zql 4 ly nt with force mg, which we will call the actiq8ew45lz ld+pngyf8 5on force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Eal4*5krseufjq j;jqr 4+w;:5he5xl t jrth pulls downward on the toy with ie+j 5 lus5q4wjr;jfhqtrl5 4 k; :*jexts weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitchede5 hqkz)6a-- jnlp/ym3(l kyzmpt1b3 to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude i3pa -()h-btzn py3/m mkly5l qjze16ks

State Newton's three laws.hgsfa 4x -q/:iqmy9 b3fs(- kt

  Mass and weight

  The acceleration due to rc8.q8e3q jtvyf:/)f t/ c t j6nro*pbgravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the :t vy6e/fq8pnf )j*qb8jcc 3/o. r trtMoon's surface, compared to Earth?

  An example of a force which acts at a distance kxc6a;3n e hocpyu-1 -is

  Who has a greater weight to mass ratio, a person weighing 400 N or amp,qn wnd0nojg+720 i person weighi, nj 2opm0n 7+wig0qdnng 600 N?

  A stone is thrown straight up.y3dp23)ae wu,o j rmt6 At the top of its path, the net force acting on it6uje t3o yd ,w3a2rpm) is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same heigh2m fk. 2jgrx 61o0vb8dhtk d;it. Ignore air resistance. g 2bf6kkr; vj2m.di 8d0xo 1th Compare their accelerations.

  A brick and a feather fall to the8ua fel. z4(e:sacqi: earth at their respective terminal velocities. Which object experiences tecz:a fsl(eqi:8. 4uahe greater force of air friction?

  An object of mass m is hangiy ,,wej,oo *gtng by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the *otewy,,, ojgtension in the string?

  An object of mass m is hanging by r ,qg+vpij5l5ksn f(d *q10wg a string from the ceiling of an elevator. The elevator is moving upward, but slog+w q5*sjfinpl(,50qgr1v dkwing down. What is the tension in the string?

  The force that keeps yo, d cskpxzhaxhvz )-y t l:)7jbpruw093m8 b15u from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy cayy39dll2zvs6 y vl/ kykd:m8 *rton from rest than it is to keep pushing it:zsd6dyk y9*my3vv/l8l 2k l y with constant velocity, because

  A horizontal force accelerates a box from rest across a horizont0:+9 p6cpx3l mi fclpbal surface (friction is present) at a constant rap pci0+m 6c:l f9xbp3lte. 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 acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Tshs3l1dho+ 3/ nmrj9 +8hahzo hus we can deduczdsrjh8oolh/ m9++has1h 33ne that

  A block of mass M slides down a frictionless planebyzw2s 67x) k 5if/fxg inclined at an angle q with the horizontal. The norma5zw/ 7 skg6yixx2f)bfl reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an ann:gen1o4d4/wyk5l sv9nl57x k y+k ktgle q with the horizontal. The normal reaction force exerted by the plane on the blockl5 5 79w kovn4kys :+ dg4nklxn/1eykt is directed

  A block of mass M slides down a frictionless plane inch/ h7gq8 iqbr7j2n5tag,:z v mlined at an angle q with the horizo7ih,g2n8ha/ m:qtg57qbrvz j ntal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an incwegc5t5 3dre hil2(x06a i nhhkvi6ir 57o 29blined plane that makes an angle of 30e with the horizontal. Make a statement2o(der 6 l53geh t9n0 ii5h ai27krxh5iwbc 6v which best describes their acceleration after being released.

  An object sits on a frictionl 6e cvynzuvmyfz5e d06pi5+;coex ;31ess surface. A 16-N force is applied to the object, and it accelyee;nvzxuyo15cfze3+ md0 6ic;56 p verates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from ghpbr -y4*;wdrxnryx ;7s 09r rest to 27 m/s in 7.0 s. What is the *p rwrd-rrnxy; h7xb gs409y;average forward force on the car?

  Starting from rest, a 4.0-kg v b6/k);*wg mukpr;ujbody reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the pw/bu 6gm)*vku; j;rk body?

  An antitank weapon fires a 3.00-kg rocket which acquirb clwjj))j9y/es a speed of 50.0 m/s after traveling/w)jjy jl9)bc
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 mass from rja3l2o. x. gecest,olejgcx a..32

  What is the mass of a person who weighsnm -i)h/ow( 9/ zoofcs 110 lb?

  What is the mass of an object that weighs 250 N on the sw+2fq am2+1xjn 8/j uxfmvp ,vurface of the Earth where the accelerat,2vuwf +jp xf axv+n8/1mm j2qion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kvnpvvn: +hpev /rb 609(j+etxg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to grav 0jv+(:n/pp6e hvern+9 xvtbvity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weigcd3cky s d abvk ic;-d*c/e65/hs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare/65aicdy*d 3 kec/d ;ksccvb- the masses of the objects.

  Sue and Sean are havingk 6gb4cl:.ils a tug-of-war by pulling on opposite ends of a 5.0-kg rope. lk6 bligs:c.4Sue pulls 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 o6kbysw fvv05 9n a level frictionless surface. A force F acts on the stack, and it accelerawyv9 kf0bvs5 6tes 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 44lzl +j* sqy9t80 N stands on a scale in an elevator. What will the scale be reading when the elevator is accelerating downwardl* 4+syjzl9 tq at $4.00 \; m/s^2$?

  A person on a scale ride .z.xh w.*gj qb w)nd.n6/ s*dwlxgr*bb.g0bns in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates *xnsx*w6g.r.*.zw/wb gbqhbng0.)j nd.bld 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 xqu,efr u3; rw;ka-9rp4n,ik person is 60.0 kg and the elevator accelera r kaepf-u r,inu,k;4q9xw3r; tes upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces ac33 w hcng:iaogd 3ay3zp- nc5+t on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the easo3n- ngg a+:c3aw 5chz idy33pt has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg req*fy32tx6/skrmzc 9 njme6u, /zs;+ ap olkk5sts on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum 3/mextoscs6 f +anr ;k5z p6ql9um,ky2k*j z/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 1riae , fnn-swrlg +/6-wtk60) zp6(hlfweygtruck. 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 mini16,/-n rz 0l)gif6a rwlhe-kg (e p+wfws6t nymum 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 m9+7l87;ps mi p,+ a gjp qpwu4b,aquze = 0.40 kg, what is the magnuagl p+b sp8,7m w,z;j9p4p i+7uaqqeitude of the 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, nra 85rj3om0r what is the tension in the string? (Igrjm0 or85r3nanore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with aq8yl3pxwg qy 4 hm/f3a-lzz1 . force of 100 N in a dirzqmy/ zqfl 1w38.3p4 gxayl- hection 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 with a *lh o5hwxsw x ghu*182force 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 x*wgho 2x1*8su hw5hlthe box?

  A traffic light of weight 5hqq 9-x3xn ztytzp5 )100 N is supported by two ropes as shown in Fig. 4-2. What are the tension zyq3 nh5)z-pq9t5xxts in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of theq)qbc 89sk2n.m ce(zrhv ui; ; traffic light?(s9q hmnuccv;q ek;b. )2r8iz

  Two boxes of masses m and 2m are in coq0w j+6lq yqm9n8cd, untact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massiu, +yqn6lmdw0 c q98jqve box?

  Two boxes of masses m and 2m ar4o e q(eau qwfr5ic;9ta9r /:) dcjv4fe in contact with each other on a frictionless surface. (See Fig. 4-3.) What is toj4cf() 5iec r aq4 /r ut9fqedw:v9a;he net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (Seegz4p6 au zahn0.2h 5l,ecde8o Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the .h a64n2zz,hpgoe 8d e05al ucconnecting rope?

  Two boxes of masses mu*u d;c-dv7p o / /p1i9g:tyibwxsnk- and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more masst:gudc-b9in /;/owpixdyk-v 7 s1pu* ive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cordaq9bv-m. oe6 vu/t2byj. hyz *a:cv6m running over a pulley as shown in Fig. 4-5. Box I of mass bq/hco6t m zajba.6:9vmye2-u*vyv.
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 h pbt bu( i(w (zbq aq0:cw9q93tr1y1qkinetic 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 applipyq03w9ahbbqc(q( 1qb9i: tutr(1z w ed to the box?

  The coefficients of static and kinetic frictions for plastic on wey 9ifxm( 7dd:ood are 0.50 and 0.40,e(9 m7dixfd:y
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 dir+pxldu8u; 09yv zok3bection. It slows and comes to a stop wi+8pzouu3 dlkx;09yb vth 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 surfacekn9py0 tw:7hn eh1kk6 is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration tnkk91nw :6y7 kphe0hof the object?

  A horizontal force of 5.0 N accelerates avqm + xrtk 8q;kjgig c1;1.n4h 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 is given an initial speed of 10 m/s. It slid2p1(fe a nb g)r3ce2pees 50 m on the ice before it stops. What is thagee2f2ne p r1p) 3cb(e coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police xtjon2,-k5(b wt:rxm find skid marks 90.0 m long. They detn- x2mwtr(bo5, xtj:k ermine 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. eljf kkg l(+v 4v1ay:+4-6.) The surface between the more massive box and the horizontal surfacjvk:gk4+l(1+ velyfae 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 ar. ej7s:pv f;ure stacked. (See 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 le.rv supf:7; jess 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 vh*p s4g8lp:w-e-i ge, ftui,plane. The plane is inclined at an angleu sti*,wlpf4i8 eh,-p:v ge-g of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down t 1gqg7./;r z(-xzs3dg tubqfa flat 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 plan jmcao0n2*u./phf g 5fb-ndl7e 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 oeq6/ z .k7qfacf $35^{\circ}$ 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 vey16+kl o soa x zi*n5w98,imvxlocity of 6. 9i*movwok8yx n1sa lix, z5+60 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 slides down a rough lghctl;sx,4 t 60v;fl$37^{\circ}$ 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 r t8wz8in.h)e iough $37^{\circ}$ 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 e mdw+u6r -.5 *udstjrweighing 500 N along a rough surface. The cable attached to the log makes6+jtrru* w-sdmue. 5d 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 inqipccipk4 nya6w4hb1 ;c1z(6c o- a- aclined plane tilted at an angle of(c - i 4-bz1kaqcp1n6hyi4ca;oa wp6 c $33.5^{\circ}$ 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 anglef/iyiq xa26s,y 27k gh of incline is gradually increased until the object begins to slide. The angle at which this occury/iyh 2 7,f xgkaq2i6ss is q. What is the coefficient of static friction between the object and the plane?