Which of Newton's laws best explain4*u6prn+.o 4xxw8rvxy u5y fys why motorists should buckle-up?

  When you sit on a chair, the resultant force on you izk 0)aht3p nnnq(y ;vm m38t(cs

  In the absence of an external forcetsan 3s: bmi)0, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIz j29 q pwk29h)1z+vtb mfcy6aN are suddenly turned off, while traveling in empty space, the 91czfta bjm)2+6 pqz2wk9yhvstarship will

  A rocket moves through empty space in a straight line with constant speed. mz0; k bllwpdv+ 7m,z0bh(yc 2It is farcz z( lv, bwhpb0ml;+0dy k72m 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 motion is

  You are standing in a moving bus, facing forward, andw-e hy 7d1ux/ yz7gv/w you suddenly fall forward. You can imply from this thatgx /dw vye 7/uy7z1-wh the bus's

  You are standing in a moving bus, facing a;tt)g:rjw)/t 9 f lmrforward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forwa/gwt:;r ra9))mt tl fjrd?

  A constant net force acts on an object. Describe thni2f-f hk6(z ae motion of the object.

  The acceleration of an object is inversenij6d3 in/n34 zx-;nj;cz ougly proportional to

  A net force F accelerates a mass m withjkz fmdw2ws ,gqq 7;9; an acceleration a. If the same net force is app2kw m 9q;z7sj;gqwd, flied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an accelera2s vv9a xz7g/q3. psfvtion a. What acceleration results if a net force 2F acts onvq 9v g7spaszv3.2x/f mass 4m?

  If you blow up a balloo).bt (7pm:-zfhn l gjon, and then release it, the balloon will fly away. This is anm.lnf-) p t ghbz(7oj: illustration of

  Two cars collide head-on. c*mu ;1 u83u( 2rvf 2znxkoqtoAt every moment during the collision, the magnitude of the force the first car exert2 o*qmc1;on 2 fz xvruku(t3u8s on the 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 objb9/7nngqey uj:po u3z 6 ip0*eect, the force which the object exerts on you wip eiuo*7gy q:9bu 0nj p3e6zn/ll

  Action-reaction forcesun*x e/o 1de5y 3e9 (.yzltmjm

  Action-reaction forces4zoza90qx*4 gy , afv g18zbuzna6nf- are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to theyl q7 6)pr+l7; fgk4x1ruec6h* ba rpw car. Since c6ru qg1 rxl6+ypr hlbk*f4a7e7p;w) a lot of damage is done on the car

  An object of mass m sits on a flat table. The Eartlgjp*u75bnd e q w:q,0h pulls on this object with force mg, which we will calqb7 , ljn*w0dpu eq5g:l the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means o5q a5 rh mrram)zf/9-hf a string. The Earth pulls downward on thehrha/5 q-5zrarmm 9)f 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 instex3ffu tbl3:i s,30itantaneous force. The ball hits the bat wi fii 30,efx 3l3tbt:suth an instantaneous force, whose magnitude is

State Newton's three la 9 j.m h:daaev*a;4zosws.

  Mass and weight

  The acceleration due to gravifpx8k u)**fj ity is lower on the Moon than on Earth. Which of the following is true about the mass and weight *pj 8kxf )*uifof an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance izo5;zk-8s bo, 8yfd yus

  Who has a greater weight to mass ratio, a person weighg*. l.mykyvyf h6e8m-wx(1f hing 400 N or a person weigy1ky xe*gmf. 8l6 y wh(h.fvm-hing 600 N?

  A stone is thrown straight up. At the top of its path, the net force acting on zvbe/ z)nt.i* k)sw)nzt4f8fit w 8izk4 f)nt/z* nsf)ve).tzb is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from thr g 1; b35onho3e. trqh1xhrf9e same height. Ignore air resistance. Compare their acc;9n o x.qe bhhf1h35rorg1t3relerations.

  A brick and a feather fall to the earth at their respective tek(6:ap 1d e4r;jnoiwy3m hogt qd8x tr3n32;p rminal velocities. Which object experiencgtpr hn (w68o:e dpyqt3;3 mnki r ;axd3214ojes the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. Tf2 xek 0+eaq4ehe elevator is moving up at constant speed. What is the tensi2q0e eexk+4 afon in the string?

  An object of mass m is u m2+3oyw-6fklud 91j0b vu:h( ppwfbhanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is m u0 pj +vfwwpl f( 9hyku26bd1obu-3:the tension in the string?

  The force that keeps you from slidpujd5 3x fatxggx+*;) ing on an icy sidewalk is

  It's more difficult to start moving a heavy caurh.g bgdc+f l p:t9:4rton from rest than it is to keep pushing it with+ugbcdl:g: rptf 9 h.4 constant velocity, because

  A horizontal force actzo7as0 5f; ibcelerates a box from rest across a horizontal surface (friction is preseno5a;b7i sz0tf t) 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 con gt wl1rn 8tcm8fo;w;6stant velocity. Thus we can to6l8wgw8 m1f;;n tcrdeduce that

  A block of mass M slides down a frictionless plane inclined at an anglx:q/uuzo2k7 dh+3un ue q with the horizontal. The normal znduk uqh+2: oxu/u73 reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionlesst- s)s,w kvpahwsowra) b38*4 plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the s sahwpv b-4w,ast8)o3k ) w*rblock is directed

  A block of mass M slides down a fz nqz4 y )i)9mfk*y,chrictionless plane inclined at an angle q with the horizontal. The gravitatinqhczzi49m*fy )k )y,onal force is directed

  Two toy cars (16 kg and 2.0 kg) are released sim/ 9edjynhd sx ve 5l.3drtf3;,ultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best descl;3eyxrv, e5 3/fhdst9nj dd.ribes their acceleration after being released.

  An object sits on a frictionless surfacetscg./1- b lnk. A 16-N force is applied to the object, and it acce/l.c 1k nbs-gtlerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate fro .pjvrz1j*v/bb6ir n-m rest to 27 m/s in 7.0 s. What is the average forward force onb *-in vv6brz/.rpjj 1 the car?

  Starting from rest, a 4.0-kg body reachegvar e,t 3bcu9l17c 0qs a speed of 8.0 m/s in 2.0 s. What is the net force actc7rb q 0vtc19ul,gea3ing on the body?

  An antitank weapon fires a/h8xh*b std) r 3.00-kg rocket which acquires a speed of 50.0 m/s after traveh hs xd8/)*brtling
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 m6 4ibbezpoy;xpd0 b5 .ass from rest 0b ;xb 4opi5depy6bz.,

  What is the mass of a person who weighs 110e2w6 *svdd 8yz;qvg o. lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth wpx8p7( w-ehfb3p bhg9vpm10 ihere the acceleration dhf 80 1iemp-phv3bx (pwg79pb ue to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass fwxr c;, 03rxzw2wrn;of the object on the surface of the Moon wwc,rww3z0nxrr ;2;xf here 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 N om:oq:rj 1 dar,n the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objectqa1:dror:, jm s.

  Sue and Sean are having a tug-of-war by pulling o.f04 ) rtbg h2:mph odmvoo+p6n opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope pf6d o mtm:gv+4phob0.)or2 h accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. 04g oqmo )/e-fyggzw ( A force F acts on the stack, and it acceo)f g/-o (z4mwge0 gqylerates 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 scalz-)g cwf 00 fjpcir379vq .mjle be reading when the elevator is acceleratin00v.p-j r ji79clfwzq c mg3f)g downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 6q/hb yy*qsfhvze1 5050.0 kg and the elevator azhq55yhv0qy/e*s 1 bf ccelerates 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 y( xu*3arhvl(ut0td+the person is 60.0 kg and the elevator acc dvrhxat+luy*0(3 u (telerates 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 magnitude of/cogbvu k/k..m)ap d3 8.0 N and is directed due north. The second force toward the east has a magnitude. k/vouc3gam bp.)d/k of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbedfjlyu y2;xtz; obi9,, 6h6jco of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000j;u,zy2y,tf l6i ;bcj6hxo9o 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 resbez+ 2jfh;j /ots on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal / f+oz;jebh 2jforce 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 and m = 0 k e+fn.ikf*d65 bwu9r.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the5eikdr+ 9n b6kf *uwf. pulley.)

  In the Atwood machine shown in Fig. 4-1vkk) k )g+ ppp c1f+q-roxn09ps2tk)y, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore gpk-21++p x)n9 ) 0 koykkqcvppsf)rtfriction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floo+wz7/i rs+oep r with a force of 100 N in a directioez7 i+ow+s/rp n 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 smqzpfdu5(0 f (kooth 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 kg, what is the normal fqzu 5d(fk(f0porce on the box?

  A traffic light of weight 100 N is supported by two ropes as *2,fp (,5 pgmpjmgstjd 4j8 a.qhl6znshown in Fig. 4-2. What are the teh g4mzq.pj*td(,ms5jaf82 l p g, pj6nnsions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, whapt d*smb x*x- pn6+u- si6 kuf0d5ls *rah3+cat is the mass of the traffic li m5r*3ac0hu6tik xu6lp s*dxds-sp +-*nbf+a ght?

  Two boxes of masses m and 2m are in contact with each other on a fricti,qq(m qqf.qg,s*qd3x onless surface. (See Fig. 4(g *3xqd. ,qq,mqqsfq-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 frictionless xh.x, / zw()tlp qd0mxsurface. (See Fig. 4-3.) Whax0 ,)l (xmzw.xtq/dhpt is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Figbwpx4 8b:yk; w 6xwq n.phxxvc13 z4jb 1d:ri+. 4-4.) If the forward fc phk 6xv8b+p1xr4bjz dqyw n 4;b.x:iwxw:3 1orce on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m ark7rs sifmxf :o;r1h 7:e connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what kmsf7: h1 7frxosr:i; is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4* vgi,7,wraak h5n1kt-5. Box I of mass71v5,w*k ai,gkn trh a
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 t;5-a t y eczfb)qt7uav5)wa8 kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net ffqavt5ew t au) y; bc8zt)-a57orce on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.50 aoi c*hnhbef18yk*fm9fz*a b :m+1;m gnd g1hfmn +8m:z*k hbfo *c 9*may1;fbe i0.40,
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 wtr ezf) l2r 6j:8kq6dthe +x direction. It slows and comes to a krf6rz)w: lqt 26jd8e stop with 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 a horizontal surface is pulled by fb3,vzeo c1b :a 5.0-N force. A 3.0-N friction force retarefbz13o b,c:vds the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg m/ .lwp bfk6bqyiic;/ 8ass, 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 slige8 r oae) o0a4gdaga5xy j4. d02+slpdes 50 m on the ice before it stops. What is the coefficient of kys00ara4oe de8g42 g olaa5xpg)d .j+inetic friction between the puck and the ice?

  During the investigation of a traffic accident, police fincn-qi phv2q0 r2 09cq ld4.qncd 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 prevailn2 .c9cqr 0qcv4n id0-2hlqqp ing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stax4qlgcz u -jlw32s/ s0cked. (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 bozwl lsg4s-qc 2/uj03 xx?

  Two boxes of masses m and 3m are stackg +)4+a 3p: (msaxm1 gixkwzured. (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)( pua++iz:kwm1xxg srma 3 g4 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 - 2.ed/iln nlub5mz9u inclined at an angle5/n-l9um.n b2 euidzl of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill thr6ri1b9 m8el6 q0oxvv, rz, pmat 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 plln m .vbb(l;.dane 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 planeh-f2:q4;f p54zxqlwo g2 egqz 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 inclined plane,me pwp:2f.ao6t-b /yq at a constant velocity of 6.0 y waq-/bp2.pe m6t:fo 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 p(4cyh3i r9 ewa, p*rxz2 bt-krough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass mzx4ua;tp5) ak;zp(q c slides 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 /a:1k) qphs 2si7l6:ybk+ jsjhnh m l+along a rough surface. The cable attached to the log makes an s:klpkl j:)sjha s q/h2+ymn bi6+71hangle 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 tilte,v sw9 zdf9r3bd at an angle of 9d, fvzrsb w39$33.5^{\circ}$ 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 anglef29wep7 hl6 wf 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 the object and tw ew76hf 92pflhe plane?