Which of Newton's laws b2 . xl*nnxfemfyo8d: ue;e q61:hroh)est explains why motorists should buckle-up?

  When you sit on a chair, the rrr-ak)wpf2v-fwq 9 q4esultant force on you is

  In the absence of an external force, a moving obje-9 we33aeotk p3l:2unmym1tc r:veg 7ct will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned off hajik:ze+6w6jv4vp /blgsw..keu-3 , while traveling in empty space, thek s4eg:wkw63j/+i6up-bvvzh ejl.. a starship will

  A rocket moves through emptr/y-vc/krpbb :yh m*c0-k, o8 ;uuojoy 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 mus-kv/o;u,b /ob yh0mr cproj* uk:y8-ct be applied to the rocket in order to sustain its motion is

  You are standing in a movl*uuspy1 ow3g q79uo) ing bus, facing forward, and you suddenly fall forward. You can imply from this that the busy7l)1u3sowu o u p9*gq's

  You are standing in a moving bus, facing forward, and you suddensdxjqetq3*w a.:9 m2fly fall forward as the bus39t . qeq2mxa f*:wsjd comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe c-7u qsvv 84geuib. g/the motion of the object.

  The acceleration of an objex)e 28cj3+krea u(6zko a9rttct is inversely proportional to

  A net force F accelerates apm0ni2ppi 24o mass m with an acceleration a. If the same net force is applied to m42i20pin m oppass 2m, then the acceleration will be

  A net force F acts on a mas-al m0gh hn/so74a( ;qgsn+u ss m and produces an acceleration a. What acceleration results if a net force 2F -m /07hagqn al hsg(s;4uo+sn acts on mass 4m?

  If you blow up a balloon,lq/+ -vq*y i 2uy,s3 m*rzkesl and then release it, the balloon will fly away. This isvr ,+ 2sue* myzik/ 3lqqy-s*l an illustration of

  Two cars collide head-on. At every moment during the collisim,1 s *feto:bdon, the magnitude of the force the first car exerts on the second is exactly equal to the magnituse,mfdb1:t* o de 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 exerts(n4j )il 1b1psgyta *zego w11 on you wi1wsgp noi1l1ge)t* b4 1(zjyall

  Action-reaction forcesiwl jv - vbcx-b+0w(ya ohd)0/

  Action-reaction forces ars * sq p-l7o2aube.ydx+ :7tuhe

  A 20-ton truck collides with a 1500-lb car and causes a lot of damss0sl;c-:24yliv car.yl hx4 age to the car. 2y; clla vsrx lsish.:4c4y0- Since a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pun)n*i 5lf;87dwhvauz lls on this object with force *z8vd)7 fwlh 5i;nnua mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended fromd;b5zdr(e q8j the ceiling by means of a string. The Earth pulls downward on the toy with its weight r5zd(ed j8;q bforce of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ballf) gr;3el:w-d * qryjs pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude il:f3* ;-rs yg dq)erjws

State Newton's three lawsb/dl99n,,lsu l +ka/w3vpe)k nvoff0q nx67 e.

  Mass and weight

  The acceleration due to gravity is lowt/(uhhqt+w+um85lh . rc 9 nhmer on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's shhh/u 8mcr+ lq nu+mt9t5.w(h urface, compared to Earth?

  An example of a force which acts at a distance(o .sm8fip5njz *0ksx8)fqzb7x w 2in is

  Who has a greater weight to mass ratio, a person weighing 400 Npa9 76x0 xoyvv b7ffu5 or a person weighing 60fx5 f vv7yoau0b7 xp690 N?

  A stone is thrown straight up. At the top of its path, the net force vp/u ygqs,2z1r3q-fh acting on it is,/fy-zv 2qhus 3rgpq1

  A 20-N weight and a 5.0-Noij,z.oz/*/r1 cxcqj2 vh +vt weight are dropped simultaneously from the same height. Ignore air resistance. Compare their accele,c rj1/o* c2xzq h/jvvzio +t.rations.

  A brick and a feather fall to the earth at their respective tedm0 5-j +0op6cyvt3winlw fy2rminal velocities. Which object exper2f6 m pl +jwc3n5w vt0id0y-yoiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an ele ogx6bki,np1j0 +s+euiprv:0 vator. The elev +s, koxn p6piri ejv+bu0:0g1ator 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 of an elevato6*ec4 hn.eku ur. The elevator is moving upward, but slowing down. What is the tension in the cehu*e4u 6kn. string?

  The force that keeps you from sliding on an icy sidewi /n x189rbtg a1tlz,kalk is

  It's more difficult to start moving a heavy carton from rest than it is to 76a9 afuib cr,keep pushing it with consta rfua96ic b,7ant velocity, because

  A horizontal force accelerates a b u 6sq6 tm9 mb/*;l5xetdz4y-uv br0kzox from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all condit *9k0dl6/ txr qsbuy6 4bmme-; 5tvzzuions remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slide1qx v5.tno ,;cgp iyjxwx9a*+ s down an inclined ramp at constant velocity. Thus we can deduce x*qcpv jaixx w19 o,+yg5.n; tthat

  A block of mass M slides down a frictionless plvd9 j16 d uhiri(iw2h8ane inclined at an angle q with the ho 2wi9 h( jhivu61rdi8drizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slidesm( ne wxnu: bpe8q8,a ub(l4pu-jm6 p: down a frictionless plane inclined at an angle q with the hj p:w mubel6p4nx ,(numebu( aq88:p-orizontal. 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 * dsvy o 5fh q2s44*nk6qo;duzangle q with the horizontal. Tn 4dqsvusqfkzo6;5* hy d2*o 4he gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released siemerl 1z1k+ 9vmultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a stam19 vz+rle1ketement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appliepw1.: wnia;(fcz:lq nd to the object, an in ;z a:n:(wqwlcf1.pd it accelerates 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 s. Whahm(m7s tcudxll,v+m: ;nj 3n6 t is the average forward fhxmm n+jl;sln(3t6 m c,vdu:7 orce on the car?

  Starting from rest, a 4.0-kg bodby y7/z6h2knu oq+gj ;b.o;wt y reaches a speed of 8.0 m/s in 2.0 s. What is thh2t6. g;q7k+nw;you o yzbj/ be net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket ws 7y, bcxl46ig*b7qa zhich acquires a speed of 50.0 m/s after travelqx7clg bbayi 7zs, 64*ing
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 fromimnw 4k/h1 e/ ptt-; ) dpnrttxs8w 2ei(hv*s3 restp s/3-dx*vnwn4 we8 /(h khri)p istt;2e1mtt,

  What is the mass of a person who weighs 110 lba6 scnhxmn-ohw zplj3: 0 z.+6?

  What is the mass of an object that weighs 250 N on the kcnom0jjf3- ,surface of the Earth where the acceleration due to gravity is-ok jf0jcmn3, $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the 6 moilp l-07acemgf 6/mass of the object on the surface of the Moon where the acceleration/f6gl -7lpemcoia6 0m due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 4 6 3hhra.d6jetknm9m0a a)fj80 N on the Moon. The Moon's gravity is on0t9dk 3jm)6f6emha rnja 8a. he sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are haviyr3spokn ,5tg* yf v7.ng a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. Whatn fg*vr .yk 735o,ptys 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 surface. A fo vou q)qp*ie9+rce F acts on the stack, aiv *9+)e oqpuqnd 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 an elevator. What w,x.s uimnf7l p-bmk;( ill the scale be reading when the elevator is accelerating dowxl ;nus,f.pm7i-( m bknward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person e+ c(msj9)r0b4wmth vis 60.0 kg mt4h ( jrem9b+c)vws0 and the elevator accelerates 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 m +m :wfiz2vm. m6 ff7uj0ad*xteval9 (ass of the person is 60.0 kg and the elevator accelerates u9xmw aij (ut.a emmlvf:6*2 fdf z+v70pward 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 m q2tbyn5r0y2c.yaxv1 ass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east h052arn1tyyyc v .2 qxbas a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 600nfdrx /okw6 750 kg 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 truco kw/75fn6rx dk 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 60c,83hcr +mugxn2 ahn 000 kg 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, wh3uanh hr,g2 x8cc+m0n at 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 6l(p jkcr:v,bkf2 pq onn(:y(.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the ma,o(kpnk: qfjycr(b( 6v: 2lnpss of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kgr0fp u7vphi/b2z v(0p and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulleyp/i0rf bz h0 uvvp(2p7.)

  A student pulls a box of books on a smoom1 *fv:h;2hv/i)ms6b f maw anth horizontal floor with a force of 100 N in a direction * i n2mav/:hsa)mf1hv f6bmw;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 force of 100 c2jh.z:: x i)of e6c bxm9zohum k769uN in a direction of 37.0e above the hor z7 6ox6z:9k i2hjocbhume) .f9:uxm cizontal. 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. 4-2.ze)/ra8-9anycrj oc7 What ar7jc9)zrr-ey anoc a/ 8e the tensions in the ropes?

  In Fig. 4-2, if the tensions k.r3kf 9 c+ 4icdtvy9xin the ropes are 50 N, what is the mass of the traffic ligh kkdvxrcyi ft9+c 43.9t?

  Two boxes of masses m and 2m are in contact with each other on a fricaehe8hd.gs -230a, nmh5 uajiaa4 (d) k1rnm wtionless surface. (See Figa)hnra k - .s8a0 uwhj 15 ,em4gmna(iadedh23. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in c 7o ooq(ft(67 owmu.e t3m9xloontact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massive boeo to.l7(wt6omomo(3 x fq u97x?

  Two boxes of masses m an mmdue-v-0 ghf+.1fg wp5teo9x2tk(od 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, hoe0.-ftuxm(-5v1gw dktem gp2f9 o +what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope.)fr;d.(+js me ozj*wxqub l6 / (See Fig. 4-4.) If the forward force on thujm/.w( x * +brle;zsodqj)6fe more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected 8* mcrh5wu; vlby a cord running over a pulley as shown in Fig. 4-5. Box I ofl ;5rm hw8u*cv 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/8tpj; 1 faggk frictions between a 3.0-kg box and a desk are 0.40 and 0.3gtgjf/k81; p a0, 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*lzx2fu wtu-9 wood are 0.50 anwf2xl 9u z*tu-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.ub96pcgwk 4p +x direction. It slows and comes to a stop with a constant accele6ugpckp4 .b9 wration 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 l;ujfr9e u/al: wal 48pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the/89 lae ar;f4:uwljul object?

  A horizontal force of 5.0 N accelerates pe cvd i4vfef3 2; ;bt/f1zse0a 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 slides x-ih /u8ig( vv vkr+wzknx71050 m on the ice before it stops. Wha07khukv-vz 8x/(virn1 gw+i xt is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident,7 f;1 sgo)9 lt-exhntk 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. Estima7x-tf1o e) gt9l nhs;kte the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The sur a8ikq4b4x*.l/pvn who 7b;oaface 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 static friction force on l7xhp/aanqw8*.io ;k4vo 4b bthe less massive box?

  Two boxes of masses m o d4e(mka26 jt6az4mpand 3m are 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 less massive box does not slide on the modkz pm46 46atomej a2(re massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclnh 5m7;mlhu e*ined at an angle of le; *5hmumn h7$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that ma/(x : zfjh(lzcex9mplc8x0g2kes 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 anlu1p+4fbr3 p u 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 w ,55xqqdk f5ird0qsnqf *wf.y22p; qinclined plane tilted 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 inclined plane, nd/8zcgqa;iw t+q4+ a at a constant velocity of 6.a+ qwdcn;/+t4qgai8z 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 slidesbgi p69an*tnh,iv2) v0/oqu s 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 slide3 .az (cdf-kuwy/if1ld; po b4s 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 attach1fv(t j 8wbe q;,te(tf.c kf(bed to the log makes an angle ofeftw(t8;q 1 ff,vejt(b.cb (k $30.0^{\circ}$ 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 8e*4yxg;g kcxinclined plane tilted at an angle of8xgxc;g kye *4 $33.5^{\circ}$ 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 pot4g-nff x7e)lane. The angle of incline is gradually increased until the)g- o4ftnxe 7f 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?