Which of Newton's laws best explains why motorists shoul9ya-mn sn ;f wvy5o;k(d buckle-up?

  When you sit on a cht p;-6 wpmvsg* yg1um:air, the resultant force on you is

  In the absence of an external force, a moving 9xc. .ckj-w,np; jr)9 n i7k*rrgdrnl x9m (dpobject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turnedx.5tj: d3p h:p nyo9 6 hrvllkiq+3ef+ off, while travelifo5 .3 6 :y9:vx+3hprtjkd qenlhpil +ng in empty space, the starship will

  A rocket moves through empty te;yj/yk s)q;space in 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 to the rocket in order to sustain its motio;k se;y)t/ yqjn is

  You are standing in a moving bus, facing forward, and you suddenly fall forward.*sa gz5u7mccc.hg 19l You ggzl.5 9s1u hcccm7*acan imply from this that the bus's

  You are standing in a moving bus, facing f /iw agq k9pkenz.4 0ysq3l0c+ho,8 gvorward, and you suddenly fall forward as the bus comes to an immediate sk8 0ag.q43zkywlvs,q0goc n+9ipe/h top. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the obj5g8oan -yxns2 i.xq33nihv*tect.

  The acceleration of an object is inversey5 /ddtta j,r6ly proportional to

  A net force F accelerates1e tskwcf :.*g e:yl4f a mass m with an acceleration a. If the same net force is applied to mass 2m, then the awe.*:f41fys:t gc elkcceleration will be

  A net force F acts on a masq 5h-h :,ocapi x ebl8kaeo7+gdj6)m.s m and produces an acceleration a. What acceleration reoe)6g-ej5, 7 xc qh.+ko mid8baa:plh sults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and th-*c yrnj bs4g v0ze0yy;j c8my(h+c- ven release it, the balloon will fly away. This is an illustratiovsge +v-0rjmz0y cjh8y-by;ccy (n* 4n of

  Two cars collide head-on. At every moment during the collision, the magnitude qxitj2h:dgpyc 3; jlw c.56b6 l(p7snof the force the first car exerts on the second is exactly equalw tgl6:jcy;xpb37ls25 jqd. p n(i6hc to the magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F o9n b)wt j5srs+n an object, the force which the object exerts on you wil5j bw+nt s)9rsl

  Action-reaction forces/-ikbuk n*dyo v8 -m p5t-,7bf1 cmbwm

  Action-reaction forces , o/;juwb(kyiz ;1wwware

  A 20-ton truck collides with a 1500-lb car and ca. ;q gn-lqm ,wc*ans6dnd3 o,zuses a lot of damage to the car. Since a lot of damage is done on the cagqqw6z - ,,nno d;l*and3csm.r

  An object of mass m sits on a flat 9ba, qeoj 9*zmtable. The Earth pulls on this object with force mg, which we will call the act,moq 9b9jz*e aion force. What is the reaction force?

  A child's toy is suspended from the ceili 0nkd9tjnbxy,)spq- 2 ng by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action fojnp0d9)ytn-xs 2 kq, brce," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. Thekv skpb.gqo6y-bye ;0qn o( 13 ball hits the bat wito .0pbqvbky q;nsk(y1 -oe63 gh an instantaneous force, whose magnitude is

State Newton's three laff3.zr 4cth/w ws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than ofeg e9hf i*z0jzvwa2 ;l :j85gn Earth. Which of the following is true about the ma:efv i 9 wagf80gljez5 h;z2*jss and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts atovrpl +9 n w(0luc7efdja. ,/k a distance is

  Who has a greater weight to mass ratio/n + jn,ymg8l1sb,k/rnlo 7 bf, a person weighing 400 N or a person weighingb, ,yll/gn 7m+bs r jnof81n/k 600 N?

  A stone is thrown straight up. At tv/)x iyz(.feadfmo5l0ud o +5he top of its path, the net force acting on itu dyfo+m)5lz5 oeia. /f(d0 xv is

  A 20-N weight and a 5.0-N weight are dropped simulmo j9wz;ss6 jng 8/77fjz/uwjnr -f8 utaneously from the same height. Ignore air resistance. Compare their acceler6ug7j8;z/fjjs- w7/98omsjz n nfrw uations.

  A brick and a feather fall to the earth at their 9ou w:rdk 3.3h71zdtsbme 4 enrespective terminal velocities. Which object experiences 9du.o 3 zkenhb wtem7r1sd:34the greater force of air friction?

  An object of mass m is hanging by a stringuqkd 9 vdd5 lbb1i84mkrb6/n9 from the ceiling of an elevator. The elevato8k1v/b b4dr6qu bm ddkl9n 95ir 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 ceili4ghgu 3xd*h(g ng of an elevator. The elevator is3*g hdgx g4u(h moving upward, but slowing down. What is the tension in the string?

  The force that keeps you fromu4z g*5 s n c*w:wl8(z-xrgiuh sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from restrw l2vqz 6i1,i than it is to keep pushing it wiz1 2 ivrlw,q6ith constant velocity, because

  A horizontal force accelerates a box from rest ace/4mj:3s) 7jlvrv hdbross a horizontal surface (friction is present) at a constant rate. The experiment is repeatjhd)blj:vv47e m s3/red, 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 cod,iuwqx0m x (.gmv4b 7nstant velocity. Thus we can deducxw 4(,g mmdx0b7vqui .e that

  A block of mass M slides down a frictionless plane inclined at an angle rh:9nmnht, i )x81dhw uq v00eq with the horizontal. The normal reaction force exerted8n x 0)9h veh1h0u: wqdtmirn, by the plane on the block is

  A block of mass M slides da4* 73h x s1jgwh2/qsp9nepg t4 pmg5yown a frictionless plane inclined at an angle q with the horizontal. The normal reaction force ex/y9 a3wphghj2p g ns 1 qs7*x5gt4mp4eerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclirar u. dl 9(ud,p,e1xhned at an angle q with the horizontal. The gravitational force is direarxdl.(huue d ,p,r 19cted

  Two toy cars (16 kg and 2.0 kg) are released simultaneously ojciw yb6*i 36hajo o37n an inclined plane that makes an angle of 30e with the horizontal. Make a o36*a67wciy hoi bj3jstatement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is agq;w0m8,) m x3om2b.jj iefa lpplied to the object, and it accelerates atbwl jq ;em3if802 m,gmax)oj. $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s u,j k *5,:bn 4ldmryowm c12tiin 7.0 s. What *lou,:4n,mbjkmd wi21tc 5yris the average forward force on the car?

  Starting from rest, a 4.0-kg body rt*nkow/,,yapcedn (iye2l ++ eaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on tik d, +(y/ple*+ otnwc,nya e2he body?

  An antitank weapon fires a 3.00-kg rocket which acqui9t(diunbjzqb . f4 31zres a speed of 50.0 m/s after traveb4b nji.3zz q1( tdfu9ling
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 man kq puz2n/8,nss with the same force that you push a 10-kg mass from renqnn uz,pk8 2/st,

  What is the mass of a person who weighs 3i ea 1qe6g7xhx03iui110 lb?

  What is the mass of an object that weighs 25 g/gelww)nqngr39 p*a9k (y3k0 N on the surface of the Earth where the accelera39 kn*3lke w(ggp/qa) ywgnr9tion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of67pwk45z/ pf0)lopzfw5m x hw 60 kg on the Earth. What is the mass of the object on tz54f mp) wx7k56wwplo0/ z hpfhe surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 fj5cf5qejymyssotez ns)3 1)f;5se;*- dc*fN on the Moon. The Moon's gravity is one sixth of Earth's. Compare the massf*y 5 s *yzt5;je)3mf -ssqc1ff ee;5dc)o sjnes of the objects.

  Sue and Sean are having a tug-of-war by pfm69oxp-/3 yvwmy,(xjd 7u xlulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelex79 xo lvdp, m(ux-/my3 6ywfjrates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level ff8lyp-vr:.zxwia y:-mn7+ gr rictionless surface. A force F acts on the stack, and it accelerates :na7r-l.vmz wgi:py -fy + x8rat $3.0 \; m/s^2$. 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 sf8q2 klchgfp6(2*ig 5i g6cz itands on a scale in an elevator. What will the scale be rgzif i p8 5h662*k2cf gqcg(ileading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the)9iwzccuvy3s7 mx9: q person is 60.0 kg and the qziu s79y)39x:vcw mcelevator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ridet evkctq090 /:s3x0xwjp +evps in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration o/0 c x e3+0pp:ketv jvwx9s0qtf $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces a o1ejjbu .3vyp2me39ous 5tu4ct 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 magnitude of 6.0 N. What is the acov1ye 5u3 4t2.3jmp ebujuso9celeration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It nysd*y d1f5+ nis held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, wha ddn+5fny s1y*t 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 truck. It is heldq6 c xxhmn 4(ab5.kh-l 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 x (mx. kc4n65 bqahhl-the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, ifam46zd b,-bga: 7jcgc M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of g:6d7jz4bcb,m -ac agthe pulley.)

  In the Atwood machine shown in Fig. 4-1, if Mlp,vrr2:puz 0 = 0.60 kg and m = 0.40 kg, what is the tension in the string?ur2l, zr:vp0p (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with ::kvsbs x) -rc. ubp2sa force of 100 N br2vbp:. s :k)s-csu xin 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 horizontal floor wity3 4ldzy:9ui ,db rp.rh a force of 100 N in a direction of 37.0e aboved9u b4y:3li.rz r,pdy 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 shlue0y zv5q, opz++nr(own in Fig. 4-2. Wha , ounqzy0 z+rv5lep(+t are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the s xy)3.dh.uf:37uth ki .vfol0du fd7traff yvhtx:dd.uki u.h)sfd.7 fl 7u33fo0ic light?

  Two boxes of masses m and 2m a- )4 rtrx9 :qntni:uvbre in contact with each other on a frictionless surface)rniqun 4b:trv -tx9: . (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictips /2lmvs-)wqonless surface. (S/q2-pm v)sslwee Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.b7-24 io-k i uxnudss4) If the forward force on the more massive box is F, what 74uikds2xo4- b-sn iuis the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If tht4zzo g7o :k+/v1trp we forward force on the more massive box is F, wha+o7 :g4t kwz/ozt1vrpt is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. fy1h20:jwq ac 4-5. Bo2:fcwa1 0jhyq x 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 4. ii7mcv/oc (:jns1 bda-ghfkinetic frictions between a 3.0-kg box and a desk are ogj v h-a/cii:nf.4b 7(m1dsc 0.40 and 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 and kinetic fricti;4m,/kuty /y jt8v laxons for plastic on wood are 0.50 ank/ yx, t/; umvljy8a4td 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 tow rwnjf0f*9 e-wf(h u- a stop with a consf n0 w(hf*rj fuwe-9w-tant 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 hor-h yn1 -7hsv9vv7cyfqizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion1-97svhn7hqyvcvy- f . What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rax+ idvv3eee1z) j44li h o5(dste of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is giflk3;w7u ( ozaven an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficie ;kzlo7 auf3w(nt of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid t.)))xp cqj5uljt +c*z b4jmqmarks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.)xtjcjubp5j+)*)tm4q.l cqz 500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. *e. yzl9vu (ec (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 force on the lesv*9 (ucz.ey els massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) Thecszzt1y:/ jz* 3g q8uk surface between the more massive box and the horizontal surface is smooth agsqtz1y kjz cz3u:*/8nd 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. Ther3 y xtw,itn,v*je+6 l plane is inclined at an angle o*r,n+t3vje t, wyi6lxf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that ma vxgex p7mxpuhinrdq:lzd91)0 e t*c7s 9.2y/kes 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 angle 7 ja 8w7te evx/v*ep/nof $37^{\circ}$ 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 t93c1 hwu j *vq koyr;;ze9q8yailted 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 arim; 9m((byliy-/ gm velocity of 6.0 m/( y(mmiylrbg9 i;a- 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 slideub 38lzd g)u7vs 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 down a roupjye8ml-x)+ ky;6. j1ybtw qegh $37^{\circ}$ 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 dz/v ifq x2y2o/nnu 0b7ttl d,4 s1/jdsurface. The cable attached to the log makes an atuf7 2x o2t 0d , biqzndv//lydn/sj41ngle 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 rexg ew aenbp6phn di31 ;* vvrve3 7:*o*uz67gwst on a rough inclined plane tilted at an anglea*ep:g gw vevn7nv7dz*;6 3i3wuxbp1e6or*h 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 angle of i)fgjozh ,8 .w spzcj48ncline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static frictio,84j )zz8hjgos.fw pcn between the object and the plane?