Which of Newton's laws bes3pa8 li.--eaa x.i gqx,9mev jt explains why motorists should buckle-up?

  When you sit on a chair, the resultant forceis 6i6jb) zxk*ga0rc 5 on you is

  In the absence of an externala)c*yn0-sw4u l mkul5 force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suep5 q-8jsc9 xaddenly turned off, while travelin-ecpj 5x sa8q9g in empty space, the starship will

  A rocket moves through empty space .jp637 vtpd8bw/rynzw+ - yqtin a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied twwy+ 36n 8.-jpqpty 7zdtv/bro the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall gkm.rft.o :f cn** ey0forward. You can imply from tm*r*kf .yo 0.fg c:enthis that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forwar pub*wyc (y .3ogi73kkd as the bus comes to an immediate stop. .okg i*p 37yyk(ucb3wWhat force caused you to fall forward?

  A constant net force acts on an objec a p1i f62i ejl(hd58g2kmq(nvt. Describe the motion of the object.

  The acceleration of an obgrzrs ) 3t7o2rject is inversely proportional to

  A net force F accelerates a mass m with an accelerao4r7yi v 0iy4d9y sb9ution a. If the same net force is applied to md 0uy7iybr v9yos 4i49ass 2m, then the acceleration will be

  A net force F acts on a mass m and pro/v;2p y4 :. dsccpmfohduces an acceleration a. What accelerationfcm2v pp/soh4c.; yd: results if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then releamsemsq 5q +ive(i30.yse it, the balloon will fly away. This is an i+y35m(qisvq.e mi0esllustration of

  Two cars collide head-o,hc 4(y5 k4mub1tdaaun. At every 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 example y4a utkabm(u ,4ch1d 5of

  If you exert a force F on an object, the force w yyl 0 a s7cay2yg:xc58o/tz.yhich the object exerts on you wiyax5y/o8c y:. 2yst7yc0aglzll

  Action-reaction forc wf a.,l2b10phb 5 04iexa/1gl5p/ vedahxz mxes

  Action-reaction forces arbqmx8v /djwi5sf) k fuvp, +,8e

  A 20-ton truck collides with a 1500-gx 8fo6vnq3r +, .t7osxq- uiilb car and causes a lot of damage to the car. Since a lot of damage is done oog.vr+ 8o6q n-ftqu,x3sxii7n the car

  An object of mass m sits on a flat table. The Earth pulls on this o .eygs88 x(tnqbject with force mg, which we will call the action force. What is the react.g(y8n se qx8tion force?

  A child's toy is suspended from the ceiling by meansi;9,kk k 5 fnlnwwdw-1 of a string. The Earth pulls dw 1 ;-f ,ki5k9lwnkwdnownward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N insgztm4 u9w3 -2veg6aq; phuwux 6(pvo0 tantaneous force. The ball hits the bat with an instantaneous force, who3xog; 6vu pew6- uw 0vtpm2z9huq4ag(se magnitude is

State Newton's three laws.(a a1pwwgmven99pksc+/ 29 -dx xw6en

  Mass and weight

  The acceleration due to gravity is lower on the M jiuma k a;/;9;or(q*f:wf64o vbhnlxoon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?on:b;mkrwohux4qa*/j9 i ;l; a(fvf6

  An example of a force which acts at a distance i1 7mxl5 fbyj+gs

  Who has a greater weight to mass ratio, a person weighing9osz3d a (i;dm 400 N or a person weighing 600 N?sad (9odi;3mz

  A stone is thrown straight up. At the top of its path, the net forjc7l8sxy vk2cu n69c2ce acting on it i x yn7862cklcs9 jvu2cs

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same h .s vj:g:f p,iuo muy*m03eiz4eight. Ignore oi.uj,0: :mvumz4*p f e 3gsiyair resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective tef ga9(r ,gw;lerminal velocities. Which object experiences the greater force of air friction? wgef; (,9grla

  An object of mass m is hanging by a string from the ceiling of an itjjdfe:l wo+5dj f5:+ 99 wwvelevator. The elevator is moving up at constant speedw:d w+j5eo5:jdljwvt +9 f9if. What is the tension in the string?

  An object of mass m is hanging by a string from the ppot f zj0:;q+8eve;.3fzj dwfn8 lr9ceiling of an elevator. The elevator is moving upward, buw;. ;eo +ft :rvfj3pfz dqn90pjl8ze 8t slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewalk ssd 8j( 8qiim25 q)lc jmq(l2kis

  It's more difficult to start moving a heavy carton from rest than it is to hy)c /t7bnd( pkeep pushing it with cb tnh (/y7d)cponstant velocity, because

  A horizontal force acj+:aq,2eztclk.ii v) celerates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, andl,2.ke +jqtcz)ia iv: 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 incli ;w+f hnk6g6x 9vm3qhkned ramp at constant velocity. Thus we can deduce thnhg9mkq fh;k66x3+vwat

  A block of mass M slides down a frictionless plane inclinedfbjfvaw2 u(+wuttim u)07 * h8koy,(w at an angle q with the horizontal. The normal reacm)fv 7kwh(*8 w0tuotf y2wuub ja+,i(tion force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an anglhti( 5p3,zmqz e q with the h( 5pz3i,qzm thorizontal. 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 any+w/ next3r1m angle q with the horizontal. The gravitational force rtew+n/my 1x3is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously (, jf4e5y lmlh,1wtiae8/ n 8 oyva:xqon an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being relehem/vyqowxa (n, 4t81 yia5:e, lj8flased.

  An object sits on a frictionless sur,fs7qigk* 1+a wy5wx4t kep1j face. A 16-N force is applied to the object, and iy1fxpw5tsk ,+ 4i1kjqge *7aw t accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accel15 r ax6zuv6mwa.f6 ylerate from rest to 27 m/s in 7.0 s. What is th15r6fxa y6l.v zu6 amwe average forward force on the car?

  Starting from rest, 3lh:gb btq 5+uuh u*3aa 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the n au 3uqt: lbh5g3bh+*uet force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m6 rusipe)f o*8xp) 8psz9(cti/s aft fzeps ps)9i*86u8p ) cr(xotier 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 you pusbsatzyaj7cdb- x( qp(,y,ht.r1i/ f9h a 10-kg mass from res/1t7a(b ityzhjp. qfsy(x9 -bcrd a, ,t,

  What is the mass of a person who weighs 113gfn3vb ez0e10 lb?

  What is the mass of an objei e2hzdui-5n+cmy991 7rqr bact that weighs 250 N on the surface of the Earth where the acceleration due to gravity7-9hcrzi2dy q e+ai9u 5rnbm 1 is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the objeuluw4,qj (q *k2amc -,al wmo.ct on the surface of the Mol2um,.la caq, k(-qw*o 4mw juon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earb5ov13lp, ,t8o3n 9u:kd r r x2dfkvdzth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's59 kx8b:p2l3d3 ,znv fuod1okdrr,vt . Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg ro +x89xr z )qb*uttat6 bmvg:(dpe. Sue pud:8 xr q6*t+t v atbm)(bxguz9lls 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 surface. n( p myrcw5un/d,) : rm/4pnfjA force F acts on the stack, and it acceleratesyuwm5m)4rdr,nnfp : (pcj/n/ 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 will the sca ob )9zjz.0mqfle be reading when the elevator is accelerat.bm0jzof q9 z)ing downward at $4.00 \; m/s^2$?

  A person on a scale rides in an d1m ;otr8px41t ;fyfo elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleratio;po df1x1r8y4f tomt ;n 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 hh;w8+rbdn ncp2y.d8k q1s(*. qyyt bperson is 60.0 kg and the elevator accelerhn1b.hdk.+q yp t8(y 8 *syqrcn2b;d wates 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 frhee18f-ajmau: 2nx) orce has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N1:m fje uaxe2)r8ah-n. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck.p xs-wp/q bi)l j9-xe. 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 dbq -)-x 9l wjxpe/sp.iistance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests oniqm zu8)b 08yl the flatbed of a truck. It is held in place by metal brackets that can exert a maximum hyim0qzu8)8b l orizontal 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 =b 6 uuj77by8/9 (jwm v-ac2 oj(6xl bpt)zalnw 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction a 87bw97 p l-(tj6oyl jbx(uvj2/uw6)zacbmn 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, 4;v:oe 8v5-li7q vxymml jsw2what is the vjvy4les2 ; xl:m8qimo v w-75tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on ui6,70 2(:1xwjy , lqgg (akclsbqqur;qyq g- a smooth horizontal floor with a force of 100 N in a directiong76 qyq,jq,2l 0s:a1kquggiu-(bwxy (r ; l cq 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 boop0oip ky+ x5de2k4 cc,ks on a smooth horizontal 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 k piok0,5 d+e2py kx4ccg, 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.kf;abd oi-q q22o.,xh; zenj+ What are the teqkqfab i2h od2+e;,zo-;.xjnnsions in the ropes?

  In Fig. 4-2, if the tensions in the rnrd) w wne0e8hvz:8p 4xkte-0opes are 50 N, what is the mass of the traffic l zdxve 8 n0:)k8p4wt0-nwer height?

  Two boxes of masses m e sab/l00q 7i zsa(7ltand 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is tzbai(s/0ls at q e07l7he acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each othef4mfz 7 -;n ccbysx8h-r on a frictionless surface. (See Fig. 4-3.) What f4y-n8m -xccs;7 hzbf is the net force on the more massive box?

  Two boxes of masses m and 2m are coc-jglmwmg9t z09- k9onnected by a rope. (See Fig. 4-4.) If the forww jk ogm-m9t9-czl09gard force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connecte,04 a u/e+z*qrf e(vj4depkmcd by a rope. (See Fig. 4-4.) If the forward force on the more massivev(mkcd/ eeu ,4 pjra +*0zqf4e 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 Fhlza62dtv )69m 26u5cby eizgig. 4-5. B hvz )yt5e69 d 2u26i6lgaczmbox 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 statico3q)s*.yu jk h and kinetic frictions between a 3.0-kg box and a desk are 0.40 h k)q* s.3yojuand 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static a ep+.3dt)wp2elr l)ar nd kinetic frictions for plastic on wood are 0.50 and 0.4.plr)2 3t)radw+elp e 0,
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 direction9jr znu nc6 (jby/ blxeh6vc9ij2() *r. It slows and comes to a stop with a const6jyjcxu)hinc( *(zvj9r26r9b lne b / ant 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 horizontav: nj wixe) :ki8 nx-ae55o;ur4l mfg0l surface is pulled by a 5.0-N force. A 3.0-N f0fl)exg4:5:5 uewx- ij nm 8kvn;roiariction 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 ra6.5*rqtsco dyte 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 sp 9b4svi; i39x* ieeapjeed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction iee4;xi9sjp* vb39 ia between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 ma,hrz+c((p*.6 xdh ww p(il yz long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimate the speed ofyawd6,.h+c( z*p w(hzirx( p l the car when the brakes were applied.

  Two boxes of masses m and 3m azx v:(hd4ixn/ :k fs6hs5qfi;g6 bo4 3 iu2kwfre 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. 6 iv xfzn 6k 4h sfk(4g5hiobiw3su;dxq2/ :f: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 are sta0kg: qe*jrw -mcked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface: rmegkq0wj- * 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 friction: ane mpi67jv/less inclined plane. The plane is inclined at an angle ofiej: /v7amn p6 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill th67rp :u ex.l53 fb*l4cigm n-w8vy spcat 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 8qzwnfpc ;l ta. fs yr b6.*ph4uy0,x6with 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 inclinhw 7 w:vgs3:gxi) cdu:ed 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 i p/e2,s bp5k)2khrre lnclined plane, at a constant velocity of 6.0 r2p /l, k5eseh2b )krpm/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 down a ro-e lx;js1jvs (ugh $37^{\circ}$ 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 down a ro2bt9gd -0z vcnvw-qjbg5 p+ ,kugh $37^{\circ}$ 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 cabl9q:1 zy.krxaej+w- pue attached to the log makew9xz+:kuqpyje .-1r as 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 planq0xl8vo rht 4v:f 22*np3t hs5yofr 1ke tilted at an angletyt 8n5kh or2os2 :x 0l* rff4vh31pqv 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 angp l( ).rh.f )dhch;+n/i evuyfle 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 thev /dienu+;f()lyh.ph )fcr h . object and the plane?