Which of Newton's laws best explains why motorists should bucky2 ofd*05 y7u35a ibjsviv1hyle-up?

  When you sit on a chad 9 *sf-r)xyipvhev*4 /ihbv )ir, the resultant force on you is

  In the absence of an external force,:qdmj e-t.)05 kwat/qdflmk / a moving object will

  When the rocket engines on the/ddw0s txbfquc:.71my s+ob)s5 3jk c starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the stouw3 fk7)/sd+b5c0 b 1jdqycxs . m:starship will

  A rocket moves through empty space iw2zlg7y48,ti7hdcga n a straight line with constant speed. It is far from 8th7diz4ga 2c7l y,wg the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a mo*9 ekag) m6 aaikl,2xcving bus, facing forward, and you suddenly fall forward. You can imply from this that th al)k*m2c6k 9eaxi ,gae bus's

  You are standing in a moving bus, facing forwa.(7k icvf8mfy+46r vsj uo)w0uw/ rzkrd, and you suddenly fall forward as the bus comes to an immediate stop. What force cause(86ov+rf4ks . jw/0uzvcf kr7wm)iuyd you to fall forward?

  A constant net force acts on an d::8 pt(f-i 9zudijeoobject. Describe the motion of the object.

  The acceleration of an object is isxwv vjz7 7mg7nv1*w )nversely proportional to

  A net force F accelerates a mass m (t(he7 rc8d9)nihx6 es6khv j eq +n yfe8rg)-with an acceleration a. If the same net force is applied to mass 2m, then the acceleration will be i))nq (k+6hest vrned7yc r(h9h -xf88ge6 je

  A net force F acts on a mafd /e-:r k3miql1 .5yc8tekxe2ong;p ss m and produces an acceleration a. What acceleration rnk.3ry;mxle2 tqpi 5cod -1e fgk:/e8 esults if a net force 2F acts on mass 4m?

  If you blow up a balloon, ans:lk g d,qbrk+n98-aid then release it, the balloon will fly away. This is an illustrkrlq89 -+ngakb:s, id ation of

  Two cars collide head-on. At every moment during the collision, the magnitud+) e/hu svdy3de of the force the first car exerts on +3)dud ev yh/sthe second is exactly equal to the magnitude 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 ou v0zdr +ar .u.98frggn you willfa u. r08+vgrzd g9r.u

  Action-reaction forcx qu:74lund81kq;m/b -9shc 3slajd oes

  Action-reaction forcmk+7evt2 wb .l fl*qb9 9xqv+ses are

  A 20-ton truck collides with a 1500-lt7(p,ih qj aq:b/j ug(q:6lm zb car and causes a lot of damage to the car. Since a lot of damage is done(m:aijqq q: p,blh6jz7/(ugt on the car

  An object of mass m sits on a flat table. Ths7 r m(oos65l,w a-gbye Earth pulls on this object with force mg, which w 7a mb-ys6,o5o(wgr lse will call the action force. What is the reaction force?

  A child's toy is suspended fromz 3f-a)sdj)ml the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. alm fs) jzd-)3If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N insqzx2k s++drcg .s92svgjd s ;5tantaneous force. The ball hits the bat with an instantaneous forceq+;2+kx5 .ssgg2 vddsjzrs c 9, whose magnitude is

State Newton's three l,qn2df0q1j qkaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moomkhdjcke go02r3* 8)zn than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surfam)g8kc z*de 0 k2jo3hrce, compared to Earth?

  An example of a force which acts at a distance3k58y bf8v qid is

  Who has a greater weight to mass ratio, a person wei 9cqef ;+awej(ghing 400 N or a person weigh;wc+je(af e9q ing 600 N?

  A stone is thrown straight up. At the top of its path, th xc-h)gb0t yl)eh4d.gqg+v b ,e net force acting on il +edyx,hhgg )-c bbq0 )g4t.vt is

  A 20-N weight and a 5.0-N weight are dropped s3irdu;; 3c nuzimultaneously from the same height. Ignore air resistance. Compare their accelc ;dzr3;un3 iuerations.

  A brick and a feather fall to thejjp c2 l.te+2r earth at their respective terminal velocities. Which object experiences the grjre 2ctj+2.lp eater force of air friction?

  An object of mass m is hanging by a string from the ceilingj 5 jo hn,5m0:qih:a 1rxqgao; of an elevator. The elevator is mm5r;a, x1o:i q0ajonqj 5g:hhoving 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 elev-w/ sop61*xrczmnr-v .in8 snator. The elevator is moving upward, but slowing down. What is the tension in the-oxinsw.srnm/6v 1 p*z 8- rcn string?

  The force that keeps you from sliding on an icy si/euiwplur;0f:i i /w 6dewalk is

  It's more difficult to start moving a hel5 5s0+f7 * dm-uw ar*i3jxd0eunf tokavy carton from rest than it is to keep pushing it withm+x0505j*fnlo* uwk aet ru -d3f dis7 constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surfoh :15.hxzapcx 2 pd(face (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force2d x. hppx(5o:c zh1af is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus we can :p .zyfpp)mv3 pin j2,deduce thatvj if, npmp 2p.)y3pz:

  A block of mass M slides down a frictionless plane inclined at nvqs :ffps3;6sh d,l8..nxxv an angle q with the horizontal. The normal reaction force exerted by the plane on the b:ls dh..v8p s,f3fnn6 q;sxvxlock is

  A block of mass M slides down a frm-l020q cblgqictionless plane inclined at an angle q with the horizontal. The normal reaction force ex-0llqcgm 20 bqerted by the plane on the block is directed

  A block of mass M slides down a frictionless 3 pj326 xizug2 :tlc8 fn-4syyi+jja cplane inclined at an angle q with the horizontal. The gra cizx +3asjj:c l-ypu4f22tjgn y6i38vitational force is directed

  Two toy cars (16 kg and 2.0 kg) are releaseul46jx7m usixh.x;8l0; ntojf bw 5j)d simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best do ;86 4wf7t0lu.hsnbx mu5lj)x ;xi jjescribes their acceleration after being released.

  An object sits on a frictio fmv)xzv2gg 7c.cy,:hnless surface. A 16-N force is applied to the object, and it accelerates a ycvg).2fhmx gc,z :7vt $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg canyji6 ; o*engc7 accelerate from rest to 27 m/s in 7.0 s. What is the ncoy 6g*;7eij average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 eb,e44 y;p mnym/s in 2.0 s. What is ty,e me4ny;4b phe net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed cw-1z zl fk8940wr assof 50.0 m/s aft40rs zl s-zw9k1f ac8wer 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 wt6kv(r : no2h8ma ulw1ith the same force that you push a 10-kg mass from resml aw8nut6kvr (1 h2:ot,

  What is the mass of a per t7 :8fgcvyr pb1tz1m9xf qb*3son who weighs 110 lb?

  What is the mass of an object that weighs 250 N on 5y0ek nfjdbj sk /q,/osq1.p3 the surface of the Earth where the acceleration due to grb1 .sjkn3jq /e dsokpf0/,qy5 avity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What 0gy.4u aboxgia5i b)4,-cuo7db/ kv vis the mass of the object on the surface of the Moon where the acceleration due to,ix uoacu)0v/ b4d.bo k5 y7bv-ga4 ig gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and obd p+tbbzs5z o;6uu.7z/bo v r (nesc.5ject B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compt;v rs/zcb b(do .z6u7 5pzneo+.b5usare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite endsxnnu k *.n-*uwlx(y 5x+vz-5ob;tnr ,ukpm+k of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward S(5+k ;p+r.uln * xy -5ntn* x-ku,muvnzxbokwue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A fou +dn1ru+d4dy3 y lyn0rce F acts on the stack,yd+ u rndl u31d4y0n+y 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 stands on a scale i7 6-d7mvd*gtc+xj-tgnam9 yb n an elevator. What will the scale be reading when the elevator is acceledtv- 6mjaytdx*bc+ g7n9m-g7 rating 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 lj(hkblng 1p7 84ci2,ne8m irkg and the elevator n , 84be7( ckjhpi8l gmln12iraccelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in 9y(c g l:r chyt6qw0m*an elevator. If the mass of the person is 60.0 kg and the elevator acc:c*tl qy 6r0 hygwm9(celerates upward 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 mass. One force hjqi0k+h9z avt18j 5qsas a magnitude of 8.0 N at0zqkv shj1958 q+aij nd is directed 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 kp(.wszy: gw 5ik 5pq uo+87rhxg 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 sh wz (:s857uk5i. ppwqy+og xrtopping distance if the load is not to slide forward into the cab?

  An object of mass 6000+*md4en96 em0ja u dzt+qe ly+ 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, what is the minimum stopping time if the+0d * a9td4uyl emze+n6je +qm load is not to slide forward into the cab?

  In the Atwood machine sazif:k5 a ,/ tlw ad3kvdtth8u;x,-k8 hown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the accelerav,k,xt83ta-wtlhk az8; adi/:k 5dfution 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, w-nh z4;wld(p1qq;tcr.n wk( that is the tension in the strilt.z w-qk(; dhw 4(;1tqrcpnnng? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smoot; g 9aub0iolwzudl7xdt:l 916h horizontal floor with a force of 100 N in a directilud0:1;w l9d7xil u6gt9zob aon 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 100t+i8 dv ilh--l N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, whathi tlldv -i+8- is the normal force on the box?

  A traffic light of weight 100 N iq g sh62g6 gsircg-s)-.g*il is supported by two ropes as shown in Fig. 4-2. What are the ten -)c q-66gg2rgil*sgishs gi.sions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the:a k/rnvo2t 5k traffic /k2vrna 5:k otlight?

  Two boxes of masses m and 2m ar)xqxv 9)tmd3pe in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the mot )pvdxmq9)x 3re massive box?

  Two boxes of masses m and 2m are in contact with each 5 zg:d-f 5-l)aitw8x -u:jaa nn kt7dwother on a frictionless sua55:k- dug :w7fdzt xj-a8a)-nn ilw trface. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m any0nksga7 +cad ;pamkzdz297 af/)e;f d 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting90edzdgaf n s2af;kc7 y7;pa /)zk+ma rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) Ififi vds::f h5z g66.lonxnw 62fq8 (sp the forward forc8q6in.:5dflv i6(ssh xp:fz6wgnfo2e on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. i0ck ;twio8 vvat o/r;5v6oyj1 ig j/9Box tkio 0; vyrvoi856jc otag;v91/j/ iwI 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 frictions between axp+kxt ;)fu;+v twxk1 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the+tu;+kxfx 1;wtkv)px net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for pla-- y+ rv)7pyd7j zyqyvstic on wood are 0.50 and 0.4vry7)vy + -y7d-zjypq0,
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 direc:sfjez )rwy 8p+u n5 apu2h.9etion. It slows and comes to a stop with aewu. e) sp 9ahfuypjrn582:+z 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 p)ws2ge)quce 3m4c, ud ulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of weuqc, 2gu)emdc43)s the object?

  A horizontal force of 5y9irt+qt4 g ;w.ck hblnwa4 9mqbh9-,.0 N accelerates a 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/sf+bf +c3s wfuu5)r s)s. It slides 50 m on the ice before it stops. What is the rf3u+) s+5fcswfus b)coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police fin,x*q*3 jzfcnfy9y*z t d 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 t3 cxj** q, *9nyffyzzthe speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4g7xdzto*e;) c*tro 6 i-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 6zo rt;*etd igc)7*oxthe static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betwee* 9havckwa tt-210c r k:s-eeen 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 slidkc2a-w-e*et01 re 9tcvhs :ake on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless i)7kh . sc x*4rfd9boso13jqut82jn d tnclined plane. The plane is inclined at an angle o28ds1oqskh9xdt )r3.fjcouj47n*t bf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down oe dtzxu6 65.k7 qflt6a 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 inclinedlo uw (ww63 2r6ehio2s 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 tilted49q:a +*szj 4gm/lle/u zbi rx 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, at a const l:lvbz3anj;72t t )bbgn7g w8ant velocity of 6.0 mzl:w;tgna )ngt bbv8j77 32bl/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 df9drio0+3* cbs3 kaul own 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 mx3 p6mpsz 5wc: 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 rougi;c2slx.(w alx0 v f8uh surface. The cable attached to the log ma2c .uxx(ia0 ws8f;ll vkes 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 plaly f9oar(1;p/-qvz p;m r-sffne tilted at an angle oq;ramz(v-;s 1ff- pr9p lfy/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 imiyy. u /tvksw,fw 4gj41owo vmk0*- 0ncline is gradually increased-y o4twkm.w/kfw o1svu i*g400yjmv, 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?