Which of Newton's laws bw n1i0la)+cfu+mi- s. txq am,est explains why motorists should buckle-up?

  When you sit on a chair, the resu )u6 h2p1vwz4 xwz1rzja+.gb ultant force on you is

  In the absence of an external force, a moving object watpo-tlwoud91 7m8) bi i-ju+ill

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turn fvi- f 2wmg:qn5+gpq-ed off, while traveling in empty space, tff n5-iw+v-m :ggpqq 2he starship will

  A rocket moves through empty space in a straight line with codh9)ips- uw.qfi 8zi/ f9zg) vnstant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to iq )f9)-zgi/8w zvs ih9fpu.d the rocket in order to sustain its motion is

  You are standing in a moving bus, facing fo/h8os2s wjv h:rward, and you suddenly fall forward. You can imply from this thath:8hojs /w2v s the bus's

  You are standing in a moving b-xdism m.q7 tz.1m.e) n0nkizus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What f.z)et.qxi.inm 7n- d0zmks m 1orce caused you to fall forward?

  A constant net force acts on an object. Describe the motion of thecn+n+ssw 9yd8l nv (ja 8++son object.

  The acceleration of an object ijuerkhw8- ;5ts inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the sameysvo0ga j/ 9 lqhl;7g: net force is applied to 0 s7a glvj9; :/qohyglmass 2m, then the acceleration will be

  A net force F acts on a e,uvd onb:33qun:jb2 mass m and produces an acceleration a. What acceleration results if ad:u3 bb2,je: 3uvqn no net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon wilnzwn,i 0z g3*3mx 8v.lnyf5zjl fly away. This is an illustration of 3 mn znzxfj5z.3lni*y0,w8gv

  Two cars collide head-on. At ever p3m-ontee. bg-m(lbcf1k (+cwe 0pg +y moment during the collision, the magnitude 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 an examplee -+fpg.kg3ep +l10n (bw(tm-oeb c mc of

  If you exert a force F on an objqre2:;v;vwmzy 8n7g b ect, the force which the object exerts on you willznwe;v82rgyqv;b m7:

  Action-reaction forc75 iaci:ll0,a d qv(rt7 ru,qdes

  Action-reaction forces arexugz( l-q5bnqy48ao(

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to aqn+5 hag4b+bm) l4h pz(ur5sthe car. Since a lot of damage is done on tba+n agh( uhm45zrs4p+ b ql)5he car

  An object of mass m sits on a flat table. /9r gd:s *4 qr9smxkjy The Earth pulls on this object with force mg, which we will call the action force. What is the reaction fosxjk4 sy9g9rq* drm:/rce?

  A child's toy is suspended from the ceiling by means of a strio: dj(s 8z*so cpwhr/;ng. The Earth pulls downward on the toy with its weigcswh;z jdprso o (:/*8ht force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to youbf(vb+p z,wp .4wmlvg26 7gkq with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitb6 v7gmk24qg lzw vf,b (wpp+.ude is

State Newton's three zs:uy 0) tlfci7k1 au)laws.

  Mass and weight

  The acceleration due to gravity is loweujp6tm66i3hnst0rhu,8 +yb eh0 nye) r on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Ear0hysithu08r e3 ynb6e ) hnmut6,6jp+th?

  An example of a force wna1o,u 2 ns+nmhich acts at a distance is

  Who has a greater weight to mass ratio, a person owezgy oe20 )vbo41a-k:b ( meweighing 400 N or a person weighing 60oav (b2m1y - bweek 4e0:g)ozo0 N?

  A stone is thrown straight up. At the top of its path, the net force acting on +iui) zijwi:;pu6g6o it u6 jo iwu)z+;i6i:igpis

  A 20-N weight and a 5.0-N weight are dropped simultaneouspk )33hea +njrly from the same height. Ignore air resistance. Compare their acce3era n+p h)k3jlerations.

  A brick and a feather fall to hh)irx,p :-ur the earth at their respective terminal velocities. Which object experiences the greater force of aixhupih),-:r rr friction?

  An object of mass m is hanging byo2f9v gva8v4z8v uo) o a string from the ceiling of an elevator. The v9ov28af)g 8oz4v ou velevator 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 elevator. g8dnxe- ph+rw84* bjiThe elevator is moving upward, but slp+wbr8e - xd ig*nh48jowing down. What is the tension in the string?

  The force that keeps you from sliding on amv2u0t( eprs nx)4.bftb7a8 b n icy sidewalk is

  It's more difficult to 8ovmf-q*t0r j;urhe smq:av18db33n xfq3*i start moving a heavy carton from rest than it is to keep pushing it with constant vu3:d vb8 orhq; j30*-n s83iafmfq*rxvq tm1e elocity, because

  A horizontal force accelerates a box from rest across a horizontal surface (fric 1tr+cka6fj mh09-rrdtion is present) at a constant rate. The experimenj-r d0k+atr16c hr mf9t 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 : mw4b9 )xrxecvelocity. Thus we can deduce tham)9 x:r ewb4xct

  A block of mass M slides down a frictio7 4u eu a.j jf8hyacy5twdv916nless plane inclined at an angle q with the horizontal. The norma6utvf5jy 8aw yuhjd c791e4.al reaction force exerted by the plane on the block is

  A block of mass M slides down v9; l yl3the-oo 8fsj8a frictionless plane inclined at an angle q with the horizontal. The normal react-3hlyt ;sf 9eloo j8v8ion force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclaqtt 0gwb)d4tspl az 4-b(8,l ined at an angle q with the horizontal. Theat ql(8b)-gpz4lt sb0 ,at d4w gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an iiy 83dssf7s8pnclined plane that makes an angle of 30e with the horizontal. Make a statpy78 f8sdsi 3sement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is 1 iv 9:fajwlk:j1lzu/ applied to the object, and it acc1vilz k/:wl:u9 1f jjaelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from re-7;pi i0mpnll5e . qox+: cqrust to 27 m/s in 7.0 s. What islcprq:7u i+p o0m 5qi.ex ln-; the average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Wq n4q 5nol+e3uk9 kzt*hat is the net force acting on qn345nqz9te+u*klk o the body?

  An antitank weapon fires a 3.00-kg rocket which acquiresv4c(8/k7ryh j fe5,df-oo zqy a speed of 50.0 m/s after tyyq5-ef/c4z k r7v o,(h o8djfraveling
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 pvlces/4: cg9 push a 10-kg mass from resge psvc/l4:9ct,

  What is the mass of a person who weighs 110 lb? 1p(imcc5r lk+

  What is the mass of an object that weighs 250 N onffxr 15fa 34o2q 2d8dv h5dtrn the surface of the Earth where the accel82f4qh5x3rt 1o 52 rvdfnaddferation due to gravity is $9.80 \; m/s^2$?

  An object has a mass of wu+mr)f bd q66l06 pve60 kg on the Earth. What is the mass of the object on the surface of the w6b0)+ urevm ql6dpf6Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N fn hvecvto2.t.ymx4d,8)xn 4vm 3/iton Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Comp . xe8 3.nf,vvyximmvho/ n)t2td4 4ctare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends ofpns ;z5ip + xow61a/dp a 5.0-kg roppa ippnx d;w1/o+z6s5e. Sue 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 on a level frictionless surfa(negw5z 9jnj v9t2x9x ce. A force F acts on the stack, and it accelen599xxn9tjz2g evj(w rates 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 c7cz: 1cd7 / tsdgnmd mpc:z3)in an elevator. What will the scale be reading when the elevator is accelerating d) 1cz d z:ncdc/g:p3 mt77cmsdownward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevam)w5ba3 pz ub7tor. If the mass of the person is 60.0 kg and the elev7 zua5w)3mbb pator 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 mass of the person is 60.0 kg s*)j5gn4wih8t i/l5 v*hpowc and the elevator accelerates upward with an acceleration of8lci whv/jpwo*t hs45i*g 5)n $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. On9etsv(gyocw6 db gy2/+ 9 *fyme force has a magnitude 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 masc+ef 2vgy m9by(6y /w*so9gdts?

  An object of mass 6000 kg *zzzd;e ) /l4b j w66 dzwfmdrnu5 p/gv0.teo,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 travtzzl;eu/d 46v/65 we. gbf0 p zwd),dnorm*zjeling 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) x cxf5-9pgcsre(- ty truck. It is held in place by metal brackets that can exert a maximum horizontal force of 90)(g c --x5yex9sctpfr00 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 and m = 0.40 kg,89dp0x 6ovli5b 4uihk what is the magnitude of the acceleration of the system? (Iguv9kodp0 x8 i4ilbh56 nore friction and the mass of the pulley.)

  In the Atwood machine shb-w0a*y 3l kheown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore fribk la-0w *e3hyction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force o9h j-gta7b7 mff 100 N in a direction of -gmf 79jh7bat$37^{\circ}$ 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 horizontz/()nn( vk1u)q /sy4i qoncqy al 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, wh(qnkyuzqno/q /)nv(is c) 41y at is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. 4-2z( qq j*4(bioy8 vc5fd. *j(coqv58ifq4dy b z( What are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the rhl3xsf86qhmg( 29wbk opes are 50 N, what is the mass of the traffix8 9kgbfqwsh2ml h6(3c light?

  Two boxes of masses m and 2m are in contact with each other on a frictionlesc z83yt awez75+7gzraedb 1.ps surfac pye+ ca8za7d5.g7rze1z 3 tbwe. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses 6i 0176yc11yex wq j9(asv.js a uu8rf*ahwrpm and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What iss9j*j acapr x1u1y80u i (awrw6v6ysqh 7e 1f. the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (Seeypetui2.r(cv bun t 6 i)8k11t Fig. 4-4.) If the forward force on the more massive box is1tt.6v) tbu 1rnc82yuki( ei p F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) /y ywcqqd4f;ju3ux 36If the forward force on the more massive box is F, wdcq 3u j4yq;6w xu/3fyhat 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. x0etejy *y (0eBoyxj e0e*t0e (yx 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 and kine2 mrvw am7zz3qq25 9mmtic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. Wwq2mzma39m zvqrm 752 hat 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 ubjhv*e ba868 for plastic on wood are 0.50 and 0.40,8 ebb8h vaju*6
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 diro 5mgms1: ls4n a/ks9ecq np)9ection. It slows and comes to a stoekcmons99 as/4sm1l5 p) n:qgp 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 bychfvo+ 4f /c/p a 5.0-N force. A 3.0-N friction force retardpc f/4/f+ohc vs the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest,ho3b-.q xym2t 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 sli/-uht gk j28lldes 50 m on the ice before it stops. - lj8/2ulghtkWhat is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skigp)scsc, 8y*nd marks 90.0 m long. They determine the coefficient of friction betws*c 8,ns)pgcyeen 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 de*. vbo r;of9are 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 more massive box, what is the static friction force9oof* .r;bved on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface be2:uk0qvn:zvokq; 3i ftween the more massive box and the horizontal surface is smooth and tvk3;qno zk:qvi2 u0:fhe 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 inclinenl;mh xww+. :md plane. The plane is inclined at an angle . m:lwh;wx+ nmof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hi*2she9s;wx au)bn1 jill 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 smoot)b jms:y2p dz/h 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 )mwxi+ju.. y mjyot,6plane 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 inclinuic g4f b ;ug,tshr(+:ed plane, at a constant velocity of 6.0 m/sgcg u,(h;f+ uri4:bst.
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 roay565 f8v,k9onx jf/ns mjp)kugh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slidesk1.gp5 )77,+jkpfkxov b qnn f 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 go d2,rni q.g2(q /ixblog weighing 500 N along a rough surface. The cable attached to the log makesr2(ngiodix2b,q q /g. 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 847j+ryyb f)tusu o6a rough inclined plane tilted at an angle o r6t yj4 au+fbs8y)7ouf $33.5^{\circ}$ 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 inclin2zp0eg f3y5sy g8vu+hed plane. The angle of incline is gradually increased until the object begins to slide. The angvy2g+50ys3 g hp8ufezle at which this occurs is q. What is the coefficient of static friction between the object and the plane?