Which of Newton's laws vvpz(3 byw5ftm9t qw9en0 ev..q ex1 3best explains why motorists should buckle-up?

  When you sit on a chair, the resultdyt. pf-zphl)y .5/b aant force on you is

  In the absence of an external force, a t,(c +n dgow/jmoving object will

  When the rocket engines on the starshipc e(v .oorvhwrlnt +7d/*p7a; NO-PAIN-NO-GAIN are suddenly turned off, while travelvn cd va pw(.l7t7r*ro; hoe/+ing in empty space, the starship will

  A rocket moves throughxr* ympjpq-:lst.k 2ws-;s g) empty 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 motiojg:x- yspks ) wq2t m*;p-srl.n is

  You are standing in a moving bus, faciuwb9* v4(, z ihzkxl4k4y sx,zng forward, and you suddenly fall forward. You can imply from this thax(z * 49,b4kzsy xi4vkul,hw zt the bus's

  You are standing in a moving bus, facing forward, and you suddenlyej7f,j hklvi z5x9e)cp .91sn6x 3 cug fall forward as the bus comes to an immediate stop. What sj9 pxfc)jg. ku 7ex,l61z3 evhn ci59force caused you to fall forward?

  A constant net force acts on an object. Describe th1pt yv 1/ mjndlexi5*0e motion of the object.

  The acceleration of an object is inversely proportional to+/kpa z-:zumugvw y8;

  A net force F accelerates a mass m with an acceleration a. If the6en6j9u4 qcyz ) s;pih same net force iijch;4p96uys6qz e) n s applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces antd;8dmk+ ko 5t acceleration a. What acceleration results if ;k 8 kmdt+5toda net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fg z:1c4ue w0cox 43iovly away. This is an illustrw3cgc i1o ou0x ze4:v4ation of

  Two cars collide head-on. At every moment during the collision, the magni*n2 8ws ipu0j)nv/anmtude of the force the first car exerts on thas/vmn j)0*nn2 ip8wue second is exactly equal to the magnitude of 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 4tib3l5 6ll(uc,xn ydexerts on you wiy 6cl( u4 n5txll,di3bll

  Action-reaction forces) c(k r bxkeze+7d/5wb

  Action-reaction forces/20( fa1 s 0e yhqme-a;kvllmm are

  A 20-ton truck collides with a 1500-lbq)qybmqr 6t5 4 car and causes a lot of damage to the car. Since a lot of damage is done on tt)q6bqyq 5m 4rhe car

  An object of mass m sits on a flat table. The Earth pulls on this njgeo)e: (c4s object with force mg, whic ( j:so)c4negeh we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth lztsb*1 rlk+x)z/fxg3-;q*yb- lk;.zrco l fpulls downward on the toy with its weight force of 8.0 N. If this is the- l /l.lz3rtbx o;kqb+rysxgkl*-) f;c*zfz1 "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneoe-hel7 ,)h km4mj4gc1jdo4ar us force. The ball hits the bat with an instantaneous force, wagr4mm -de,j17)e4kholc 4h jhose magnitude is

State Newton's three lawsfd 70.fngj) js.

  Mass and weight

  The acceleration due to gravity is lower on the0m(c g..*0n:-ss uhmdoayu bk Moon than on Earth. Which of the folh.s*bm d.s0mo0gu-k:uy a(cn lowing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which actsdosg n u+do,atmjfu+7*g3o4z e.-o q9 at a distance is

  Who has a greater weight to mass ratio, a person weighir5yl/,pal/ ezkz1e n ;ng 400 N or a person weighinea /nzp51l;ley kr,z/ g 600 N?

  A stone is thrown stjc*5tr p f8or7raight up. At the top of its path, the net force acting on ifprc57o8r *j tt is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same h5sp4dx4 fvq w(eight. Ignore airwqxv ds4p5f( 4 resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocitiq. 9f/hv/ exqses. Which object experiences the greatev/fq h9./xs eqr force of air friction?

  An object of mass m is hanging by a string fromxgz9 wscfqv(:-g .nr w+x(q /m the ceiling of an elevator. The elevator is moving up at constant speed. What is the tvcm/.:x wxzws( n fq+r9gg (q-ension in the string?

  An object of mass m is hanging by a string from 5 cd;6o qduj*.fux :gkthe ceiling of an elevator. The 6ocu.dxuj5fk; d:g q*elevator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from tl+row)5m apidq 6;26jy+hgm) t 6fwe sliding on an icy sidewalk is

  It's more difficult to sthcbpjk/:km rv 2eksc;z1f*40 art moving a heavy carton from rest than it is to keep pushing pf: j2hc4 k0vbrk*/ ;mszk e1cit with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal 7v8 sovx jn1kqayx9w6tx*n2)surface (friction is present) at a constant rate. The experiment is repeated, and all conjxnto2 1 vk w x*)98qn6yaxvs7ditions 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 at5o:tnahn yn4s s6 6ujzw9z z+0 constant velocity. Thus we can deduce t5ujz 9nsanzh06t nyz 6+ wo4:shat

  A block of mass M slides down a frictionless plane inclined at an angle q with tfyea5 d/+jes+he h+5dejy+e sf /aorizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictilo ;ntme-:+aegq- c w5onless plane inclined at an angle q with the horizontal. The normal reacqawl-+-e otn g5c :e;mtion force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclic6xj3ski5 a.rcvlsq 4-: g v4ined at an angle q with the horizonta ic4cgvj5ri.36ak4 vsx-:sl q l. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined p oji/4x k4uwx*lane that makes an angle of 30e with the horizontal. Make a statement which best describes theirj44uko x/iw *x acceleration after being released.

  An object sits on a frictionless surface. A 16-N force n2x:;yb9 ezma- .u7ihtw 2n fxis applied to the object, and it accelerates xnnztaew9 y h-xb7u2fim:2 ; .at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelpf(+s:5: ig;j tubmt a ):j je8llr.uqerate from rest to 27 m/s in 7.0 s. What is the average for;f+ qu r )lt::j.(us5m ega:8tlp bijjward force on the car?

  Starting from rest, a 4.0-kg body reac n n;. 9z*sde6lf)yqoyhes a speed of 8.0 m/s in 2.0 s. What is the net force acting o9n;qy)n6yl*e s. zdfon the body?

  An antitank weapon fires f;e n,ij*a8a kt3n e:1x ypr5 td/ogla) ;gw.sa 3.00-kg rocket which acquires a speed of 50.0 m/s after travelingta5oxn wg ) k, sfit:;*nr.la ay3epg8e1/j d;
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-kg m ( b axoi6q6gekq:t1p7ass from re :a6kgq1e q6x(p7 tiobst,

  What is the mass of a per y -ticts7b; 4) m1sbgczu,si6son who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the 51ynwqea 8z;6n mm;qnfp(.ef surface of the Earth where the acceleration due en8( nza.qm p1mqe y;ff; nw65to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kgg(j ltr/s0r7y2d pe.2 at m,mj on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on ytmd /7.a g2t plmjers2r(0j ,the Earth?

  Object A weighs 40 N on Earth, and object B weigexvj6 j9)tpfkdm (87: sfe j;nhs 40 N on the Moon. The Moon's gravity is o 7x(fks ;8j9njfd ejt)6emp: vne sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of r1wfax ,b*a 8s7wwsd8 a 5.0-kg rope. Sue pulls with81wa a7f ,b*rswxs8dw 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. A forcg3sa0ghz -,vptz1 i w4e F acts on the stack, and,h z -1v3tgw4g 0ziasp 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 elevator. What will the zwt+: 5dotgd) 8wo5gvscale be reading when the elevator + t:zow 5g5 d8)tdgwvois accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. 1bd,xg+zp1u 5ypvbfz h:7 r-s If the mass of the person is 60.0 kg and the elevauzpdbbgs 7z-1hp5vf:yx r 1,+tor 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 oxa;6 ;(*knxe18bz x(dajdgkl(u eg 6uf the person is 60.0 kg and the elevator acceler(66;gdeu *18ga(kuz lkb;jaxex x (nd ates 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 force has a /sk9uq5 9 r a9vwyjueke*o*y-magnitude of 8.0 N and is directed due north. The secondk 9or*uvu5ka9y ws/y-ejq9 e* 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 02rpn16 kluhzk)l4m2 w r1o0hckmrim*p56 vt 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 distance if the load is not to slipn0hvw6* i 4urtr m 211o lz lmkrk)hc52p0km6de forward into the cab?

  An object of mass 60v/) i.u)cwy/mn3rgh 5 vk*vf0 ep c:ol00 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. When the truck is traveling m3//vn5v*)cuevo.ik0):wp cr h l yg f15 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 Fif f 7sb/av54s)pen rp e;i19ajg. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frisfs7evi)p4rbj;ae 9f1p5 /n action and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if Ml +-iywwt2l bu-m/.bn = 0.60 kg and m = 0.40 kg, what is the tensioyi-l.2ubtww b-+ lm/n n in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force of 1004 ,pf0mclxp,*kr7y- +5 hypg 2 usiwao N in a directiofa+lh 5,7oyuwyi*sc4-p0x2m ,pr kg pn 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 ho+j o in+ bhzvo2rr; i:q8y7+farizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the bookaib+ +; yr8ro+ij 2o:zqfh7 nvs 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 shown i-c)8 pnkd k6agn Fig. 4-2. What are tdgka6- nc )pk8he tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is th mi)7kxkfq 45me mass of the traffic l5q m4kikfm7) xight?

  Two boxes of masses m) uobf.wjm/ ro)j9g n3 and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of thb9)r3j/u.jwn )omg foe more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless s:+ bunod(iw/ r8bi2rvurface. (See Fig. 4-3.) What is the net force on th:r ibbni (2vru8wd+o/ e more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the f3d7.yy 7kh ,eqp4g7iyckz1 fi orward force on tedpqifki 3cyk71,. g77 yh4yzhe more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) (onz2j t- fnr/psg,3 g If the forward force on the more massive box is F, what is the accele3f/ t zrs-2ng p,(gonjration of the less massive box?

Two boxes are connected by a cord rnwh:myq s5kx1 z7 i8n 1qz8.hjunning over a pulley as shown in Fig. 4-5. Box I of massm5.n w7xqhkznj8hq81 1zy si :
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 frictions between 7r4rb)v;sgxio/ /klj,q 7kihr uh*t, a 3.0-kg box and a desk are 0.40 aiit/,o ;uhvrqr s ljrg/x7 b,*7hkk)4nd 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 frictions for p4isxq; ih pr74lastic on wood are 0.50 and 07rxiipqhs4 4;.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 r4 o+-mz+v93chlnx deslows and comes to a stop wi+h-xc9rln+dvz3 mo e4th a constant 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 abkm; /cyu:,bu horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the mybc b,u;/k u:motion. What is the acceleration of the object?

  A horizontal force of 5.0 N acc (f*h4c :aqbqnelerates a 4.0-kg mass, from rest, at a rate 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 slides 50mbd* r8)i1ghid +) atl m on the ice before it stops. What is the coefficient of kinetic friction bei) at*dhgdlmb+8ir1 )tween the puck and the ice?

  During the investigation of a h5 7hyc-1+qf; ioa9k/ as ,ufhsxkda1traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailax/k -ha1ihhf9oay,5s+f;sk q u d7c 1ing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stac w)jx+.f mzf8lked. (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 less massive f f+8xj)zw l.mbox?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surfacetsnqdbr1abt8p i,u;izxt:3 5(t1tn2 between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. ;sxtitzqb2ainp1: b t1 u5t,t nr8d(3If 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 plane is inclined twtnib 8+b t,.8sbu.rat an angle ofn+tbb8. .ruttw,i bs8 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dp /j0n6tzsch2+f 4ccw own a flat 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 gvrftl-zlfn m jm*g-a ;1s,16 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 tilted at an angle or: vaz0 nxy3:, p za:nxm0aab(f $35^{\circ}$ 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 ince4f,s4+k-*tnty gixdlined plane, at a constant velocity of fst*4 gt4-+knie y ,xd6.0 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 down a roqss 4 onkr8teb;aq75jq0,br1es1 ai 0ugh $37^{\circ}$ 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 ;gip2b bm au5: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 weighing 500 N along a rough surface. The cable at oq 4ff plk2twz-io8.7i1ne5cfip9n *tached to the log makes 2f f cti*1-7zpilq4o .9npwiekn 85o fan 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 an4hun3 pae/q( b angle ofpu/nqab eh(3 4 $33.5^{\circ}$ 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 incline is graduaic6:jts5o 0/xrzx/ e.i; ubmblly increased until the object begins to slide. The angle at which this occuo6c/jxr5i ;mezt.u 0 bi:sxb/ rs is q. What is the coefficient of static friction between the object and the plane?