Which of Newton's laws best eojsf3ufj/42jjy:m,l;r7l vu z o6wgg,*mg: kxplains why motorists should buckle-up?

  When you sit on a chair, the resultant fomja0.93. rx7f0h ,o+gik xhk)czeo vo:e l 6adrce on you is

  In the absence of an extern9s-fnypo4et 0zsf/g a/kvcn.gj. qn hp9.j/ .al force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN j3g uox(5x *ixare suddenly turned off, whil 5*xxu 3(xoijge traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with o0 z o/j0f5xucc c,u*adox+1h-z1gdlconstant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to/h1x5fcgxuzc*10l dz o0dj u,c-o+ao the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, andr tqx:ya.t qw b4su*8xr7-f ,l you suddenly fall forward. You can imply from this that the bus'sx8x4qq,t7-f sl:*uwr .b tyra

  You are standing in a moving buz)mhgcq9( k)cs, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you qh9zc c())kgmto fall forward?

  A constant net force acts on an object. Describe the motion of the object.l:jbysfn *zz5k-dwl / 0 pew5:

  The acceleration of an ob84r;y5c afa)c/ma ne cject is inversely proportional to

  A net force F acceleg 5o htjoc3)+fs wq;i8rates a mass m with an acceleration a. If the same net force is applied to mass 2m, then theoj)q c5f8tgswi+ h3o ; acceleration will be

  A net force F acts on a mass m and produces an acceler ( ( -vnpa)fknm41cds 21fswvsation a. What acceleration s v) 2n1(1f-(p4msf d wkacvsnresults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon wihud .v m1ji:di/r1w( ill fly away. This is anmi.1idw1/vr: hjiud ( illustration of

  Two cars collide head-on. At every momenw *835:*uluuk -z/bprcisebnq*3n eet 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 cwuez*en3 bu*us p8:lr3/c5*biek -nqar exerts on the first. This is an example of

  If you exert a force F on ans 2 fnxpm8jwyh3d bvai+);520o; gmdp+vc cj* object, the force which the object exerts on you wilmovdpa dfg;0hys*+mc8i pj2+x;w 5 n)v c3 bj2l

  Action-reaction forces)7tt,, rvzz rq

  Action-reaction forcesn 3l )9j- egca20klmqu are

  A 20-ton truck collides witrzab9 1n mjijv03na* /h a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on am ja *9n10ji rnb/zv3the car

  An object of mass m sits l74* xpsqfjgv: ( uqz4on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reac 7lfuqsg 4(vj4:x*qpztion force?

  A child's toy is suspended from the ceiling by means o,2et;1 ylh bm3p-kizurt, 9h uf a 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 "rea- 9 ,y;li2 ,hbur phtukm3tz1ection force"?

  Your bat hits the ball pitched to you with a 1500-N instantanelpcuvk-bv5r mv ,99vkyq(7d/ous force. The ball hits the bat with an instantaneous force, whose magnitude isb,dqy7m9vv -vpkv lr(c5 /u9k

State Newton's three bm p-ny.hk.9hndo7i0laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth.r) /wu hr6gkk (mpn/)7 s0fhqq+ h(tmo Which of the followin7 k roh/hmhk6rm +q/sngwq0p)t(u) f (g is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a di m;m +3 ohi6;;.mv7jw:g2i surab q6ejqvm)cnstance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a f mm55wqgd-wu2jdmx/a h6e1 , person weighing duwd1 m2j6qe, xfmha 5 -5/mgw600 N?

  A stone is thrown straight up. At the top of its path, 2a55osad4i/x88cnxv llejym .hb. ;qthe net force acting on it ie o5d.mn 2./jbl8;ialsqcv5 8xh4ayxs

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the6/i:-gx l74w mlf ptdo same height. Ignore 7l /lfgx-m 4o6it :dwpair resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocitiep 5 e:m25 kf z+8dgykzlog)5dls. Which object experiences the greater force of aolzm8kf2gy555kg) d ep +ldz:ir friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. c sgr01ao oafacv (da/og()5dlp2-1 hThe elevator is moving ga a-/gdocav)1a l2 fh0po(srdoc5(1up 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 io(thqa0 yi u/k a+1w0 46mcydelevator. The elevator is moving upward, but slowing down. What is the tension in the (iu6actm o4 w/d0q0hi+ayy1 kstring?

  The force that keeps you from sliding on 9kx3he+kyejb 631kc x an icy sidewalk is

  It's more difficult to start movixhpkic8 pa 452ng a heavy carton from rest than it is to keep pushing it with constakx ch2appi54 8nt velocity, because

  A horizontal force accelerates a box from rest across a horizont *oh lo;vx/(4zxwr 7ju*j r:caal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontalx* / zoo 7h 4ja;:x(rcurvwl*j force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp atl7qee,auv(pmm6 1 r (k constant velocity. Thus we can d rkmauv(,6eq1 (7epml educe that

  A block of mass M slides down a frictionless plane inclined at an angle q wksl27e6 cs 8ylj0 mvu2ith the horiz l68lc m 2esjsuyv0k27ontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slvl*(x ef8 ae7bz ,nm.sides down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on thze(,nlfs x bme 7a8v*.e block is directed

  A block of mass M slides down a frictionless plane inclined3: x,n teq,dm/kodc3 a at an angle q with the horizontal. The gravitationatx,3n 3cqe md/k: ,adol force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an i9gs w+z(xs :wsnclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleratiowxss :9zs+(wgn after being released.

  An object sits on a frictionless surface. A 16-N force bm5zm*t k(4eo is applied to the object, and it acceleraoz*(m45 b tkemtes 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. lic)h )sq7uapiw4g4,c9z p t2 What is the average forward forc)pgiu litw 4 9zqapc24h )s7,ce on the car?

  Starting from rest, a 4.0-kr+b3psu5 lry +g body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on ty+s br3p l5ru+he body?

  An antitank weapon fires a 3.00-kg r0. . i bi9knjmmb/p eu)gv4h dbp-0y-rocket which acquires a speed of 50.0 m/s aftebmp p)/dkrhegni-4-mby0. 9jbi.0u v r 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 same force that . ;, h;aruh mbqzehzv)milt/w6) z11l you push a 10-kg mass from rest,b er6q) ,htmz/hw1z;aillu v 1m; h.)z

  What is the mass of n(y48o )s mrxau ho2;ya person who weighs 110 lb?

  What is the mass of an objecs;pm vm c so;2-uv;nq (;:nfist that weighs 250 N on the surface of the Earth where the acceleration dsvoc n; s2snqmmv:u;(if ; p;-ue to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Ea.f 1ykd7dafh35bmm5k ev b bp*kz-k62rth. What is the mass of the object on the surface of the Moon where the acceleration due67fa5kkh.3ddb p mm b-f ev*ky12 z5bk 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 Mx oun-jl 9oo71oon's gravity is one sixth of Earth's. Compare the mlono1uj7o- 9xasses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite end(-z0-hqh zjq p8ymf4 ms of a 5.0-kg rope. Sue pulls with a qzhh 8 0mz4pqfy j-(-m15-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 surface. A force F acts on m: t3kuu5 2kixhuntk9;a)k3kq, e0na the stack, and it accelerates xte3,uk kk 9 )aakhkuqn0i;5 3u2tn: mat $3.0 \; m/s^2$. 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 will the scale goxv8i (+ cnmncfc0z ; v)t-6rbe reading when the elr n tfn0zc+8;ix(mvc 6 )cv-ogevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rid 3 q2jqmrzsp9ri-6cj3 es in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an ac9jr-zpqji rm qs362 3cceleration 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 ct1;k ;t5 frdc7o8d bsperson is 60.0 kg bc tk 51o8r;;sd fdct7and the elevator accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a uj6nuqm, /j:q 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a / jq,m:q6nuju magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000.j t xxa 76z5f/t*lizd 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. Wht *xd z67jltz/i a.f5xen 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 ;5gi*dhkg m zi6b,zp8the 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 load is not to slide forward into them8g6 pd zkg;h,5izb i* cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, whapp +67qimm3 c dy*6dcet is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.) cddy36q+e*m p7 ipm6c

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40gnfsx: b+sr.v ) pvt-( kg, what is the tension in the string? (Ignore friction and the mass of t(vg- pvr.:xstn sf +b)he pulley.)

  A student pulls a box of books on a smooth horizontal floor with ag*hva v3u6 z3t;w ;c yxcv09yh force of 100 N in a direction of hvv*ayyc0uvwh3 z;3;9 gxt6c$37^{\circ}$ 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 f 88l+5aqefggu loor 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 normal fo8eqa +u 8g5lfgrce on the box?

  A traffic light of weight 100 N is supported by two ropes as shown -zycaz-v9 ui8 in Fig. 4-2. 9 azu--v8izc yWhat are the tensions in the ropes?

  In Fig. 4-2, if the tensir.2+r*x ii 5an c;vixxons in the ropes are 50 N, what is the mass of the traffic li+ *5i2v arxx;rcixn.i ght?

  Two boxes of masses m and 2m are in contact with each other on a frictionleswpf x,x( c-*jqqh-tcxwkn-(s67v 9 zds surface. (See Fig. 4-3.) What is thfx ,j-xdws*wp 7(nz6- (9c-qcxtqhkv e acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact wi7zcns ; auw.a*ke 3hi4th each other on a frictionless surface. (See Fig. 4-3.) W*aic hzn; a7s3e4 k.wuhat is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope.z5p2+myk 3h zf (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting ropem2kpz+fyh3 z 5?

  Two boxes of masses m and 2m ar/kxzit2jq* b +e connected by a rope. (See Fig. 4-4.) If the forward force on the more ma+xtj*2/z iq kbssive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shx uhbmst49s5li0 ek o ju;+:8xown in Fig. 4-5. Box I of mas8t5ij9x0; umklbu x4ho:sse+s
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 kinetiv3:ymtef a.sw 1j- i74es(felc 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 wh.47 m fej3wi:e1ylsa f(ste-ven a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.5/t d.m0j7 vh/ kksns*meyc1px. mb1.v0 anmdnk/.kcy ..e s7*tph0vsmbj1 /x1vmd 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 comes to anwv1 ludc8 yqj0 9+ mdq-ll(-s stop with a constaj -9lqnd-dmqlv uswy(c+81 l0 nt 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 rrtq m7 v: q/h6jn 8qi8ed82fion a horizontal surface is pulled by a 5.0-N force. A 3.0-Ni 8:hq6 8 mdnre iv7tq82qfjr/ friction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a r5 s e c+w nth7x9lc1;ddw9njd:mesh( 3ate 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 slh(.tor7ihw z 3ides 50 m on the ice before it stops. What is the coefficient of kinetic friction be3w(7htor . zhitween the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 m l05v9foyr3j jwong. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditionsojr5yjfw 09 v3. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface b-(bs8xn1-cgk -fx whzqv rq6(etween the more massive box and the horizontal surfacbwx-svfk(n8gr- c6 z-qh1 q x(e 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 atlkjj.p5.1 i bg5 lo+zre stacked. (See Fig. 4-6.) The surface between the more massive box bt. 5jo5+zjig1l. lkpand 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 boxes?

  An object is on a frictionless inclined plane. The 6tp2h( wl), yyd md5gwpdnyr*)oqa+w1d3 k0eplane is inclined at an angle opyndowegd5qmt(,r 2wly01 d)*k 6 awy)3 +dph f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flhx/v 7-cc.k6 yij i yssly4 x8*6vk7bjat 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 plane with an anglx/ l*mo 39wmdae 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 tiltvvu:v:fnm aw5d. r;jm 6f9r 3 br:vad/ed 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 direct8 lpsn4 ;x xup; q1v-1)zudvjldq*n3i*h mm 9lly down an inclined plane, at a constant velocity of 6.0 md3 lpm -p;v1lj*qxum9x l )qivz;*u 1hn48snd/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 downhz6g3ef8j (auzo p+h j j.y2;lvee:m4tcu4 *u 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 dowdxs9 odv: 0)0si d+fqxn 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 orxw /88 igkc0N along a rough surface. The cable attached to the lo88r koc0xi/ wgg 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 inclined plane be9 lp*i8p(b- cou s0gtilted at an angle oloicbg0u9e sb p*p(8 -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 an inclined plane. ftc50v6g+a9 ,8hj,: ohevc llb*ccif The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object ai,o bavlc60l: *c+98,tjhecch5 vff g nd the plane?