Which of Newton's laws betxibn365(f 66hlw y 2so 2bzrbst explains why motorists should buckle-up?

  When you sit on a chair, the resultant force on yo:i ; c5*umo+r ufpj48za8 tprtu is

  In the absence of an external force, a mov 6lc.i;en*+(rcdrw xu ing object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turov /w0dw;uhxgv r 8wwmrt ,/*;ned off, while t v;w,/mdr */txvgr;8 wo0uww hraveling in empty space, the starship will

  A rocket moves through emtrn s p)s (x9gdejh4/3pty space in a straight line with constant speed. It is far from the gravij ghes)rn d/s94 p(x3ttational 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 moving bus, facing forward, and you suddex:0gaq.hzlb*6 x vj ro94*rr:9r gphhnly fall forward. You can imply from this that tho:4b hg*6 r0r* q lxr:a .9phzxgr9jvhe bus's

  You are standing in a moving bus, facing;cb9r yb1 f sg8no:wy- forward, and you suddenly fall forward as the bus comes to an immedfgc9by s o:n8y 1r;w-biate stop. What force caused you to fall forward?

  A constant net forcey:/g(7*1(iha.h jjnfoqsu u*+yrcjo acts on an object. Describe the motion of the object.

  The acceleration of an object is inverselyhley+qs -5(ct2xl kl) proportional to

  A net force F accelerates a mass m with an acceleration a. If the same lflco *men;.( net force is applied to mass 2m, then the ac * .loen(lmfc;celeration will be

  A net force F acts on a mass m and produces an acce9esd aw0ihs e8 ,p,n/tleration a. What accelerationsw 80es ,t/i 9d,haepn results if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thi+r9rx :o /a:itjrviw( s is an illuxjo:rvr a :ri(i/w+t9 stration of

  Two cars collide headr57 h/fgmtu 6v .hlsj9r8m7xe-on. 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/ 7g 9sh utrmr8 el5mhjf6x.v7 exerts on the first. This is an example of

  If you exert a force F on an object,5 q :p)7wkw3(iqc(lq rr-vpo5c*cjhk the force which the object exerts on you wikphrwv: p)ckwq35-cqqio* (lr 5 c7j(ll

  Action-reaction forcewmp4,.n( s tjxn6i.e sk(yb/xs

  Action-reaction forces arehr j2ibd5 sx7xd6*8o v

  A 20-ton truck collides with a 1500-lb car andi/s:hhb3w3zq : uf9b m causes a lot of damage to the car. Since h/3umz fh::93bi bwsqa lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this a6 zhdn,fn;w.7f;j vj object with force mg, which we will call the action force. What is th v6. ; nzwfh;d,nfjj7ae reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth p 4*tp64egnamj ul6p at4e 4gnj*mls downward 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 withvp auxq;:ma+3j.b) cq a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, w:qvqc;3pu).xjb m a+ ahose magnitude is

State Newton's threew1 an4sb/g5 cr laws.

  Mass and weight

  The acceleration due 6xrk eqe ;skrl.h;:;a to gravity is lower 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 tre hs6;x :rkkq;ela.;o Earth?

  An example of a force which acts at a distance*bwpuid z82gkpxeh / i36;sy8,ayah4 is

  Who has a greater weight to mass ratio, a person weighing 400sir9lyzm /r+ jkzv 43.x kjf90 N or a person weighing 60 jyr/zj +4kvlrk0iz9f.3 9m xs0 N?

  A stone is thrown straight up. At the top of its path, the net ffms0 :, xpe8 ,z mr)fc;nae zm.8p6twg1h vy8jorce acting on itvsz,mr6088 anp; 1jp:g8fx wm,)c.yezh tmfe is

  A 20-N weight and a 5.0-N wt nqs5;(e qv(ieight are dropped simultaneously from the same height. Ignore air resi te(vn;i s(5qqstance. Compare their accelerations.

  A brick and a feather 6de;vc19gc 3n* mwcnu fall to the earth at their respective terminal velocities. Which object experiences the greater force of air 3e vc;d6nm91wgc n*cufriction?

  An object of mass m is hanging by a string from the ce+)xf wk7lx /e55c fkcciq8d6eiling of an elevator. The elevator is movingfc 8e6cfxc7/ qi)ex5dw k5l k+ up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string f71*l k rfke*lnrom the ceiling of an elevator. The elevatorn7*e*r1 lflkk is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from su)-3 3o og2k0rz/jbd(vpxc mfliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to kegcerg f+4 6-ozep pushing it with constc zfgg64e+or- ant velocity, because

  A horizontal force accelerates a s sn1 f) ei7w.a:ju 4mtf0s+zcbox from rest across a horizontal surface (friction is sif sm1 :jst ) 0wcfa7z.+4nuepresent) at a constant rate. The experiment 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 velocity. Thus we b0+xd e1jnx7pcan dedub7d01x +xp jence that

  A block of mass M slides down a frictionless plane inclined at an angle q n8a(d.da pk) e2xa ga;with the horizontal. The normal raega8xa2)(nd;k a p.deaction force exerted by the plane on the block is

  A block of mass M slides down a frictionlo1,acwe(bod 7 ess plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on 7woac ,oed1( bthe block is directed

  A block of mass M slides down a frictrp r3bfwbv4 g33no (q8ionless plane inclined at an angle q with the horio p qn384 bvfr(3bgw3rzontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined pl)kee0+w z 0 zmyxti0rglod+ ck*2*p l4ane that makes an angle of 30e with the horizontal. Make a statement which be24** czwr0i0mle+l gzdoe+p kty k x)0st describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N foqs4jc (qpf /o9rce is applied to the objectc oqsj4(fp9 /q, and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelv xjbmpr:r.2 : t00gbjv5qwh1 erate from rest to 27 m/s in 7.0 s. What is the average forward force1pb 5t2.xvj0:wrv0m rgb:q hj on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. q 1wpc53 razwm2x x.3rh 5kw 1*bdb-ig What is the net force actin-d3g hzr 15c12xkxqw bbr*mp.wa3iw 5 g on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a se;cu71dfo rypi6 r(;ypeed of 50.0 m/s after traveling(r;1u6 dcorpi7f yey;
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 push a 10-:vyvr 2 4 6vzn bf2yfw0ern:u4kg mass from rest,2v4 vb:n rf2z:u4yw0rv nfe6y

  What is the mass of a person who weigheiwv7s .(n btmf n.(n(s 110 lb?

  What is the mass of an object that weighs 250 N on the surfacel(/t dc2zz-k*j8olczw)i8g m verr .+ of the Earth where the acceleration due to gravity z mc8g eid)lzvo./w8rr+ zk*-2(l jtc is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the o g unp/yi9r+t z/6iuc e.nt*z;bject on the surface of the Moon where the acceleration du i*np// u9g.teciz;rtyn+6z ue to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N d8- qid-hfwo(on Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one six- (h dio8w-fdqth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite )+m,vud/xy i hs b;8gyends of a 5.0-kg rope. ,/;g+ydhsv8y x)mbui 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/ b. 6bp tufgy9,m;qhzbuw 2d/ a level frictionless surface. A force F acts on the stack, and qgb6by, 92;m.htuufd/ zw pb /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 ich ojqixf2xg 4jg d.((+f2i +bn an elevator. What will the scale i jihbfg2(jx(f+.og4x2cq +dbe reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. ngh1j0s jv9 wt9d ;cb*If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration wtj 1c9 0;nhbvdg9j *sof $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an (26 6pxxvqd w,m7ek cielevator. If the mass of the person is 60.0 kg and the elevv7q xcxdiem6w 6 ,2kp(ator accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on atp8tc2e bxisha( wn).un:3 y 9 5.0-kg mass. One force has a magnitude of 8.0 N and ist9u3:cx)8y2ba wnetp ( .ins h 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 kg rests on the flatbed of a trurr:7 tnm 5vr)sck. It is held in place by metal brackets that can exert a maximum ho)rv:n5sm7trr rizontal force of 9000 N. When 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 te dhxu,/7d(jby 7i4 yflatbed 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 xtedu7 d7y4yh(i,jb/the cab?

  In the Atwood machine shown in Fig. 4-a ct+ke bo5- md2wyeh hf h(f2:.x5w/b1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? ( hd:ofeab w(t5.f/5-hwchk2exy +m b2Ignore 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 x6g6l qrvbh 36kg, what is the tension in the string? (Ignlbr6qh6x 6g3v ore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floweto7juy mr3x6,k/.d or with a force of 100 N in u73/6okxe rtym, djw .a direction 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 horizodw3ju) c1y:opntal floor with a force of 100 N in a direction)doy1wpu: j 3c of 37.0e above the horizontal. 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 two ropes as *m* lg45mwjfvshown in Fig. 4-2. What 4*wj lf5* mvgmare the tensions in the ropes?

  In Fig. 4-2, if the tensions infmg z.:;02 b,xf rzewc the ropes are 50 N, what is the mass of the traffic .20z bwrm:,;ecfxfgz light?

  Two boxes of masses m and 2m are in contact with each other on 4-a7 ebzi ; a*w(emegwa frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massivewb7 (*4 eaiaw ezg-me; box?

  Two boxes of masses m and 2m ar mzv sfloz)2) 4:lyi*ge in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the mm)s io2 f*):gzll vyz4ore massive box?

  Two boxes of masses m and 2m are conneckktjwu 4 zl)bv1);2yq:: fp efxfx +w:ted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting rop) f:1 k+: z4kux 2:lv ytpww)bqfxjef;e?

  Two boxes of masses m and 2m are connected by a rk eecoiq;9:valdi m q /*vf2n1r8d9v+ope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massiv+;qfvevdnl1:c *qv m89oi ek2d ai/9re box?

Two boxes are connected by a c .kkbbiu- 1b7j l1:xkqord running over a pulley as shown in Fig. 4-5. Box I of1xb:q.1bb lk ju7k-k i 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 stat li4v(+fnfumm i7 (g2eic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the lf mn2g+4ve7i (muif (box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictp7av, -5d sywmions for plastic on wood are 0.50 and 0s m-w75dy avp,.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 i a0d.asyn l- (2 +rkd*rjz w0y*iloezr3 m3/ibn the +x direction. It slows and comes to a stop with a constant acceleration /z z *brws3ik3 me0ydia(l.a+j 2yrl*r0 o-dnof -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting oi/(m1x;o s nien a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction s(oi;/e i1 nmxforce 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 rjce)jk7 -5v6kiszv:dezw z .4 ate 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. Ita zx9xfxaf;p1d,by 1 )2bkut7 slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and t xd;ybkx )aazfb 7p12xf91t,uhe ice?

  During the investigation ykz,:;l0fkv g)-q(xm7e dvvo of a traffic accident, police find skid marks 90.0 m long. They deter,(l0 vgvvexz;m qk:y-)kfd7o mine the coefficient of friction 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 and 3m are s 82oej893gydo g8we ks,u ekf+tacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxe,9kfoeuw o+ds k 8je82ggey 38s 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 a 8h5b-rt11 kgln(ek gwf7qjt2nd 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 doe qt g78(b1w5-ejfn1kk rt2g hls not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionlessq9 zel g6(1.+fic11bkw x dfsm inclined plane. The plane is inclined at an angle ofbwgslzq(eff d1k.9x1 i +m16c $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill thv+3 z0bhw y 8tbmw09vnat 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 w,s k1-oittx ;tith 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 tilcx7 a+ibx 02ylted 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 cu+tdp5-xt+euip 66rconstant velocity of 6.0 tc6drep+-xu i pu56t+m/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 downzc*l:edj/:0z(ej e hf 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 slidesyg5 ;y z.x,gc7gi3-lw of9gru 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 weig s3pdmnl+2)f/ ia ,sg(dao3zghing 500 N along a rough surface. The cable attached to the log maodfsl3dg) ,za m2(p+s /3angi kes 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 tilted at an ang uo3fy: x6+h:brd2u( kageg:xle of 6+( hexuo fx:ug3dyg2r ::ab k$33.5^{\circ}$ 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 ankesjj10 jl.m *x4iex *gle 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 beti*s*0j e xx4j .kl1jemween the object and the plane?