Which of Newton's lawxi/qbp5dtdl-1 4(w 9)yyc x mes best explains why motorists should buckle-up?

  When you sit on a chair, the resultant force on yqe: m5z/g l6)owqnua- ou is

  In the absence of an external force, a moving object willb:e 9ogq-/aof mc66i k

  When the rocket engines on the starshid;jw(sk*7igt*b sny .p NO-PAIN-NO-GAIN are suddenly turned off, while travelid7;yn(s twj* bs.ikg *ng in empty space, the starship will

  A rocket moves through empty space in a stmdxdd1n(q1a 8r au )auch*y:0raight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the f(u h)dy 8adaqu1d:nc*1x0amrorce that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forwardd+ 5bzpzk)h *vf. + vo95 dlhovuh7iz3, and you suddenly fall forward. You can imply from this thu37 h5 l9dpo+iv.bz5df hoz*+)kzhvv at the bus's

  You are standing in a moving bus, facing forward,x a,m3it7 wo oxo55of20e0op h and you suddenly fall forward as the bus comes to an immetao70xm ,io o5f 5pxo3 eh0o2wdiate stop. What force caused you to fall forward?

  A constant net force acts on an object. h v;9f b.d*eamDescribe the motion of the object.

  The acceleration of al7 esg+( nf8 8gx+*nbvjfu7otn object is inversely proportional to

  A net force F accele+83xqrno hw+g o.m m.qrates a mass m with an acceleration a. If the same net force is appliemq.w8o +m.h3+ roqgnxd to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an ac-)bp q6: ee+iyxgy)dj celeration a. What acceleration results if a net force 2F ac)iygp-eyb e +j:)6qx dts on mass 4m?

  If you blow up a balloon, and then release it, the ba7w*2 p t;/yjam+qz dh+g wiao+lloon will fly away. This is* wyahjq t2 a w+7o+/izd+gp;m an illustration of

  Two cars collide head-on. At every moment during tho:,1*o pcr:u q2nohnse collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude ofpsr:nho:oq,un co1 2* 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 on you ,aq, tw4pee vzsj7.kwwn-p/. will7 jwapw,.- kv/ets4e.pzqn,w

  Action-reaction forcesuk d.u tyl+*d6x w6t4v

  Action-reaction forcj +1g,d p )rgxi+sfm5ses are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the30 r 9hk6mxnmj car. Since a lot of damage is don3rnxj6hmm 0k9 e on the car

  An object of mass m sits on a flat table. The Earth r 6/eq2x0zbpxpulls on this object with force 2bxz6/rq pe0x mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by; i3j- v-r3czjwm t3er means of 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 "reactioem3 zt3-jjiw rv ;-3rcn force"?

  Your bat hits the ball pitched to you with a 1500-N i)yhm:*y - mkjgt6q) lsab,*sunstantaneous force. The ball hits the bat with augj) a:ths ,m*s*)b6qmk -yyln instantaneous force, whose magnitude is

State Newton's three laws.-;ayvz opifi;13 dz0l

  Mass and weight

  The acceleration due to gravity is lower on the Moon t4+s a:ue:hc p:;csg7 de yali ag5n*/ahan on Earth. Which of the following is true about the mass and weight of anlda;pghs57 a+e :*a:n sy:iucc/ e 4ga astronaut on the Moon's surface, compared to Earth?

  An example of a force whic+xcjm,d:q 0k0ox :r ghh acts at a distance is

  Who has a greater weight to mass ratio, a b/ae3-;*ntdf gm*ixuperson weighing 400 N or a person weighinna -g 3ued*fib*/x;t mg 600 N?

  A stone is thrown straight 3qqpvtl 5hk )(up. At the top of its path, the net force acting on )qh3t 5lpkq(v it is

  A 20-N weight and a 5.0-N weight are dropped simultaneously.i:x7j.hgrpezn3e + 2:z f6dy gzwtq1 from the same height. Ignore air resistazg .q wdx h3jpgi nz7z6:e.fy t:1r+e2nce. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal88ugg;x0:z1 py ewfhv velocities. Which object experiences the greater force of aypfwx;8 10g: zev8ug hir friction?

  An object of mass m is hanging by a string from the ceilinggsy /e;(paq+8 sc7 skr of an elevator. The elevator is moving up at constant speed. What is the tension in the staecrg kp78/qs+s ys;(ring?

  An object of mass m is hanging by a stringg0:kc/qmb3gd o6j +uy w7m7lv8bo9s s:m/ lad from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension s+m0:d yw6sq 7/7lgc mkgu89lo/mvb3 :djb aoin the string?

  The force that keeps you from slir5(o0ecy u7u eding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from resyi1hydzy 50u)0:wm jdt than it is to keep pushing i)ym djy10ih wzd u:y50t with constant velocity, because

  A horizontal force acb 7o8 c(d02j3mo bf6tz.zhzyx6mg 2k ccelerates a box from rest across a horizontal surface (friction is present) at a constant rate. The expc6.z 8 7k(mg 3mox2 z2hy0objbdczf6t eriment 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 co76:t4qpt n+vuoondwz.j pt 9i)j 5ob+nstant velocity. Thus we can deduce i ndtjz vtp)96n4j+o p+u to.b:qwo57that

  A block of mass M slides down a frictionless plane inclined at an ang/ze f.f8* mscqlyzqdw u41 ;3amk6i +mle q with the horizontal. The normal reaction force 1e6i w;z4qacl+/.zumk8q d mf m3*fsyexerted by the plane on the block is

  A block of mass M slides down ao az p+6gor11;iai5wx frictionless plane inclined at an angle q with the horizontal. The normal reaction forcr1g5 i1w+6;axopi zoa e exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plapg3: y/0cjmdone inclined at an angle q with the horizontal. The gravitational force is di :y/mc0podjg3 rected

  Two toy cars (16 kg and 2q by pfhm219)o.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horiyq) fo 2pm91hbzontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionqx hf r k6825tvbodk61less surface. A 16-N force is applied to the object, and it accelert6f vhk qkob 5286d1rxates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can a2n0 pioj.hsie 8 a31/ck lo2 k /ozdjs5b;5mwjccelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the caszs kk5wjo 25ci. / p 8j23a/d oibh1mn0el;jor?

  Starting from rest, a 4.0-kg body reachesp ws;+g/+zlry a speed of 8.0 m/s in 2.0 s. What is the net force acting on t splwz;+g y+r/he body?

  An antitank weapon fires a 3.00-kg rochq x2q122b,cvu -x yqaket which acquires a speed of 50.0 m/s afterq22cq avx,y2x -qh ub1 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 yoeox +h( m7t9dru push a 10-kg mass from resh 9+(7e dxotmrt,

  What is the mass of a r3;kza uh (kviy/z6l) person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of t pcw5-ac50vzkd)3/lv f;fkmi he Earth where the acceleratioc ;fcv)vki3dzkflw50m- p/ 5 an due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object on tjcgpm65aw 5ovy+ q2( ;/kcgf hhe surface of the Moon where the acceleration due tfqv5 m6;h +ygc5(g2/j waocpko gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, anxdzl17sa o64bd object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's.az7obsd6 l41x Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pkqdgm*9 rf 8wl34d1 feulling on opposite ends of a 5.0-kg rope. Sue pulls wit*gd 1kdwl4389mqerff h 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 leveycylw -.kfx,+v,v o.bl frictionless surface. A force F acts on the stack, akycv.f v,,lx -ow+.ybnd 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 e, p qm)owob3 a:zmt99i9:vvd ulevator. What will the scale be reading when the elevatozwmqvtb 39omoi) p:, a9:u9dvr is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If1ut zu* mu ;,h+ky.fzb the mass of the person is 60.0 kg and tyu;m*1 f+hu,bzztku.he 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 mass of the person is n4 ).i/ik nymd60.0 kg and the elevator accelerates upward with an accelen4n di)im. ky/ration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces 3ha,l5mpje 3rx0ri s191 wqjvact 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 east has a m 1jr5,0l xrwj1ha3sp 9i3e qmvagnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 600uke4tdd)4u7 /d dnio40 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. ndou/k di74uded4t )4When 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 f8 k bbq o:. cdgmy1m+f0(wxi4ylatbed of a truck. It is held in place by metal b4b 8mbiqdy m(y+0gkx fw oc:1.rackets 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 the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg a/hftes ekd 449.;uxuond m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignouu4dkee/t x f; osh4.9re friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.ec-b-svc:, d8gdydk;bu8jc*) 3 na gz60 kg and m = 0.40 kg, what is d8c,-nu *gb-cgc s a:b)vz 8;k edjd3ythe tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books a6m sq+ pqvj92:8cyjz on a smooth horizontal floor with a force of 100 N in a direction j p+y 8vc26mqzqs:a j9of $37^{\circ}$ 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 horizo; ybw-gg /gihi35mdu ;ntal floor with a force of 100 N in a direction of 37.0e above the hdhw-mi35/;;gb y ui ggorizontal. 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 twx3v:bj2)1c ypaq. odw o ropes as shown in Fig. 4-2. What are the tensions wbq3d2ay: 1j.vxp)c oin the ropes?

  In Fig. 4-2, if the tensions in the ropes6y9gnyg j xdkv :yu.;9 are 50 N, what is the mass of the traffic9y x u.dgjygyn 9k:;v6 light?

  Two boxes of masses m and 2m are in connd6ovedr r0w pt +n n5x*(x9s/zo4t3rtact with each other on a frictionless surface. (See Fig. 4-3.) sdz9rr/n (o0r* tw4t +5vxn xdopen36 What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on:2xm r xg96lkqe4i2vs em4f;u a frictionless surface. (See Fig. 4-3.) What is the net force 6;sfim 4l2r x2e9:xkg eqvu m4on the more massive box?

  Two boxes of masses m and 2m are connected by -tp8z1yi 0djra73faepk1 q cw +2fa/wa rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting ropeaf-zwa3ikaefp70q1yp 2 r 1wjt8d+ c/?

  Two boxes of masses m and 2m are connected by a rope. (See 4u hg bof4ey4 ih44t;c 0wx+zvFig. 4-4.) If the forward force on the more massive box is F,yf4xh +vobw44e ;4thgu 4zic 0 what is the acceleration of the less massive box?

Two boxes are connected by a cord running over cwt*sj c84 fv9sips 3(5jrda h*tq 4 ah(69rsea pulley as shown in Fig. 4-5. Box 5isc j3rf t (6sjq d8wvpa4*(4a*echs srt99hI 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 njzy8jc 68sv5gf:qx+ 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 isv8q n f c:jj6zx8y+5gs applied to the box?

  The coefficients of static and kinetic frictcm4 u 0ilns(1uions for plastic on wood are 0.50 and 0.40,14(unsim 0cul
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 +x8 re 6en46 oavyu,:juy direction. It slows and comes to a stop with a consta6a, y8ynvr ejouu4e6: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 on a horizontal surface is pulled by a 5.0-N force. A hl 87a91kuzel**d / mqjuvfe73.0-N friction force retuek 7/ vz*uq7a8 lh*d9fml1ejards 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 rate qt mkn8-e bsbc1x(vi94c/ vz .of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game,ixg):x at( wxq, 3hdebks 51v2 a puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficien,wqh xa bgs(21exit:dk 3x5 )vt of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90oag0fmj 0;:oa .0 m long. They determine the coefficient of f0a;:omfo0 jga riction 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 anac z.xcc8rkoo )y).;fd 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 more massive box, what is t rcx;ooy.af). c kc)z8he static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. ( u*sqc-eu j*;cSee 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 coe*-*qcs; uuecj fficient of static friction between the boxes?

  An object is on a frictionless inclin*nah q mv9u1sxqhs,3)(9p9h ss6nnr bed plane. The plane is inclined at an anglxh s6 bprnshvns939*9anh,)usq 1(mqe of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of 1zr/ p,s0jej:3 lq2zvmkrx +u$10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclinqu6 qbm (he0v2fr8 kt*ed 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 tildbm*tcr)w)5b((v 21sp masi gted 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 constant velocity3y0ti-r)w tpm19k r wn of 6.0 m/w t w3n-p)r9mt0ri k1ys.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass v/.o/pjbq jp8e y61l cit6 :ynm slides 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 slides do(1dthuihl b+p6 -o5gwwn 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 roug/,bv y(oh3(iyzxc7 mj*os yk4 h surface. The cable attached to the log makes an, 3osimj7y4czx/k( *bhyy( ov 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 qsil +b+b*mr0on a rough inclined plane tilted at an angle b+i+0msr *qlbof $33.5^{\circ}$ 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 i 1l wc-9zv*i6g5gcoq mnclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is *5g ovmli9c 1gz- c6qwq. What is the coefficient of static friction between the object and the plane?