Which of Newton's laws best explains why motorists should buckle-up /kqp 1x5j 4h8p biupk(7*nxsu?

  When you sit on a chaiqwn oq;fj. .9or, the resultant force on you is

  In the absence of an external force, a moving object w39roy2n vizb *ill

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tgi c7goa6usb 6s 9wt8*urned off, while 76i8*sacob 9 tugsgw6 traveling in empty space, the starship will

  A rocket moves through eas/aehn z.vmcsd+h ( x4 g,a()mpty 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.zads,+ hv(a e4h(ga)x/sn cm its motion is

  You are standing in a moving bus, facing forward, and you suddenl : 1ml:jhhb5ef3s zg6epy 59uly fall forward. You can imply from this3jp:1gh 56m e5uylf9zh:e sbl that the bus's

  You are standing in a move0py ;l hguo,)ing bus, facing forward, and you suddenly fall forward as the bus comes t,lupe y0); hogo an immediate stop. What force caused you to fall forward?

  A constant net force acts on jpkrn /w(j kbm+-+c(;3 nrxo jh4k(rian object. Describe the motion of the object.

  The acceleration of an object is inversely proportog,a )5f 79t:juk 7xolpp8jc sional to

  A net force F accelerates a mass m with an acceleration a. If the same nx8fihet3m:r 7xtfx: 5 et force is applied to mass 2m, then the accelerati38ffm: e:t 5rx7 xtxhion will be

  A net force F acts on a mass m and produces an acceleratioa zpl09tmwwz, 8 k(8w3x kym qaz/:jx3n a. What acceleration results if a net force 2F acts on mass 4/3xaak,k3wmtp qxz(j:z 80wly 8m9 wzm?

  If you blow up a balloon, and then release it, the balloon will fly away. Thise 4alv:asqb0scbv,+ + n4;crr is an illustratio,vvcs4n+;:0b a ql4aer r scb+n of

  Two cars collide head-on. At every moment during the cwr 9 qw(a8ac z7fw1zl(ollision, the magnitude of the force the first car exerts on the second is exactly equal to the (qr1 wfz(az9wa l7w8 cmagnitude 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 exerts on you wys)miudlv2 eh c6ldev,0703hx; ih f9ilic ev vdi;967h3 l )mdf2s0y0hxhe,u ll

  Action-reaction forces3y: :b qnjvqilx(;/d9cti ow7

  Action-reaction forces are26/a6 rkc2ifkzq dm.41 goctg

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage t -5wi8wn5f itmo the car. Since a lot of damagewmft-5 ii8 wn5 is done on the car

  An object of mass m sits on a flat table. The Ejfi a k7cdx *k)2*wyu*arth pulls on this object with force mg, which we will call the action force. What is the reaction forceauw kf)c*72yikj **dx?

  A child's toy is suspended from the ceiling by means of a stquo *dx0nwd6fc 6o m35ring. The Earth pulls downward on the tod f0 cq3*m66nw5oduxo y 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 wx*yoz41e8m3 y c+y /; 9 sv,/rjazmfuwksv5dfith a 1500-N instantaneous force. The ball hits the bat with an instantane3c vwkz +rx;ejv89m ,dm1s/y5af4 suofzy/*yous force, whose magnitude is

State Newton's three lawdp:f fk*qz.y7s.

  Mass and weight

  The acceleration due to gravity is lower on tgs68,e zxr9 q f ,lqwln,+smp9he Moon than on Earth. Which of the following is true about the mass and wei wq r fsnp6l, ,8lm+xszgq9,9eght of an astronaut on the Moon's surface, compared to Earth?

  An example of a force tw qy g /b9)6-(bys2x yuo*5igr8vid cwhich acts at a distance is

  Who has a greater weight to mass rati q5e g;ojy)(bqo, a person weighing 400 N or a person weighing 600 N;oqb(5g e)yj q?

  A stone is thrown straight up. At znxypfuirgrds/2c(04(dn-) 5c5apvthe top of its path, the net force acting on it is-nudxcg(rz /2d) i say04 p(pvc fnr55

  A 20-N weight and a 5.0-N weight are dropped sis nlm;x(xie ro i08zh6)hw5 9amultaneously from the same height. Ignore air resistance. Compxh(859m60ix ;ar iowhlnsz) eare their accelerations.

  A brick and a feather fall to the earth at the: dwanyv wwmbo6e.oh+7di k6 z: ,l+k.ir respective terminal velocities. Which object experiences the greata e6+w+l h7d,yknb.6z.o ww ::kmvoider force of air friction?

  An object of mass m is hangi;z uc 3*)xtwpcd:g a-lng by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is:)wgpl 3uc-a dx*tcz ; the tension in the string?

  An object of mass m it7 o)+tufmq867 kng ins hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. Wh7q+nn )t8o f 6ikgut7mat is the tension in the string?

  The force that keeps you from sliding on an icy sidew5r0)rq3 r qnjeya7oz )alk is

  It's more difficult to star vvwd9hbm+r:b 68))ufygaw2n t moving a heavy carton from rest than it is to keep pushing it with constant velocvnyh) w 96rb fba+mvg8wd2 u):ity, because

  A horizontal force accele*9zhy(qe5 7axv:qm, ow jh8bx0 yntu:rates a box from rest across a horizontal surface (fricxjz7v::y8hy bwa(te,0 mu* x 9q 5qonhtion is present) 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 atz.u.877irlxqc .k + 5 pprwczg constant velocity. Thus we can deduce t rgprk7w.q. 5 xu7zczilp8.+chat

  A block of mass M slides down a frictionless plane inclined at ad rp(jv*8sh-4b)wcjn k gif2 7n angle q with the horizontal. The normal reacti *s84f r2phijgb(w vdkn)-7cj on force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q with bqk/r0c hyy ,hys(76rthe horizontal. The normal reaction force exerted by the plane on the block is direct/y0cyqsr7 6,hbykrh (ed

  A block of mass M slides down a frictionless pla71 v* kubzzwj5ne inclined at an angle q with the horizontal. The gravitational force is directe*zz bvj 1wku57d

  Two toy cars (16 kg and 2.0 kg) are relek5rj32zp9dxz6t m ll f0y+1pb ased simultaneously on an inclined plane that makes an angle of 30e with the horizonzd z j f1br0pmtkl6l+2p93x5y tal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is t1res ;sg o+v3v:w/ joapplied to the object, and it accelerates r3t e;/os:+ owvjs1g vat $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 s. Whatetqkxe n ;c d/ 1ns3rylw/*z3(mmdw +1 is the average forward force on the c+xz3kwln /1e qn*tywr1scm3e/;m( dd ar?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Wha2w64 x,i xmt 2nuta)+ 6zjqdhzt is the net force acting on the z wu2a x tm+ 2njix6q6h4),tdzbody?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m)4wy.ic e p hj(ny4zk8/s after travelinnz h ji8)w4 (pe4ykc.yg
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 mass i l0ov-+dy+-n (s;)mdz-lkz.nshodw from rest, kn0o. +l wlsd+;-mzd(v )zsiyhnd-o-

  What is the mass of a person who uum 2taeg c- ,oywy3* *qwo7a*weighs 110 lb?

  What is the mass of an oth h,t(svhyw9w+ 1wxor28y-q bject that weighs 250 N on the surface of the Earth where the acceleration due tosww+ywt 2,(rh91 xy8-qoth vh gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mas:rbdesnig0no. cj4g8y jqz+1,q 55xbs of the object on the surface of the Moon where the acceleration due to b+0g8j4 cizd ,yq:qnrn 1s.x 5jegob5gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Moon'3 iy.o8hl9k)ljf gto )s gravity is one sixth of Earth's. Compare the massefl)tloi9y.)gj 3o8hk s of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposfkn1:mrhp1*d2f soz2nb67 n f -. bezgite ends of a 5.0-kg rope. Sue pulls with a 15fnnbpeo1nf*7k2d f hrgsb :z 1-2mz.6-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 surfacs8:jbv.9 z8;ju yun rne. A force F acts on the stack, and it accelerates azu.j ru: nbv;89ysn j8t $3.0 \; m/s^2$. 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. s fp(s*x /ptvgh6651qejbon7 What will the scale be reading when the elevator is accelerating downward at o6heqxgbp5s/6stn*j(7 1f p v $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the-mf w x)(lhdqqp*w4. e person is 60.0 kg and the elevator accelerates downward with an accelerat w).m xf* dqph(-lwqe4ion of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an el sjbk.uwtg*ak12)l. eevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with ank*ka..)w uje12 gtlbs 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 magni:dzge-yoq 2k9 7xxs;qtude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. Whatz; ex ogq-79 xsyk:qd2 is the acceleration of the mass?

  An object of mass 6000 kg mp np,b y.h09lqcr7:gmr;1y wrests 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 15 m/s, what is the0 r,w qmmny1y;c.: rlhg7bp9p 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 held in placeb v tj7vlfxje(y+07w*1 0by2p mwn)pt by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is th+j()* 1lb7xj twevv pp2wmb0nt yyf70e 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..i ysu(+hbl;m60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frictioy(ih;slm+ b u.n and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = mrn t41is34a80 g0k,nfwayv j0.40 kg, what is the tension in the string? (Ignore friction andvyim fa 304g8sw,j 104nn krta the mass of the pulley.)

  A student pulls a box of books on a smooth horizontaljr 8qhr;n-*tf floor with a force of 100 N in a direction jrt*-f8;nq h rof $37^{\circ}$ 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 horizonz3 58 u0yjr,jo8o9u ov6xbj iqtal 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 j,j 5oq98 oou0v8ib3uy6zx jr40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. ntwgb+ 59bap1 4-2. What are the tensions in the ropat+bn59wpg 1bes?

  In Fig. 4-2, if the tensions in1r9 u( oi47 )u.jpse 41i slfh-ptwmul the ropes are 50 N, what is the mass of the traffic) siwuf1surp4tl(e m pj4l-ho7u. i19 light?

  Two boxes of masses m and 2m are in contact with h c0j j6uz)y*srb3q.heach other on a frictionless surface. (See Fig 6c 3h0rjz)*h bjyus.q. 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 frictionlebglq,yhl ( ih;m(: 5gvss surface. (Selm :(y(gb ;q,gvhlih5e Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses mxn -5dsts(+cn 6lkg)) h wq8hf and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what i)6-d5nh( tscg8+qn )hkw fslx s the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.)9syif *)k b6dh If the forward force on the more massive box is F, what is the acceleration of9sh) di6ykb f* the less massive box?

Two boxes are connected by a cord running over a pul, k tiwf8*c wkk3(.dwlley as shown in Fig. 4-5. Box I of m k,lw.(ciwd8w3f*kt kass
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 fricti1yf+eew dgt //8fdp;h+yiov2ons between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. Whatt2h8wo+f;yvi/efd+ p /g yd1 e is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kineticsze9cg r (ib .m15/b*mtk cus6 frictions for plastic on wood are 0.50 an.6zk5 s bm(t1rbu9gs/m*ceic d 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 slw/+.jlse8 zu vows and comes to a stop with a cesw 8u +j/zv.lonstant 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 ( f mf10+xx t zarp4tj(ufluz6:;uk(hon a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What if z61f (hf lram4u:xkt(+uztj(u0 xp;s the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, a- 4an,: qu*w w-aongubt 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 o:ksx54phx+qqn ,rx . pf 10 m/s. It slides 50 m on the4,xp hq+ks q 5xr.x:pn ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accide: d4d6g gqej6hnt, police find skid marks 90.0 m long. They determine the coefficient of friction be46hdgd: j6 geqtween 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 a ngf5 : jpj,;,fcrjgn7nd 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 does not sli jc n 7;jngff5p:,jrg,de on the more massive box, what is the static friction force on the less massive box?

  Two boxes of masses m/ ol mrl+5o .qozj),,hecxg +s and 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal su m) jg,c+.qzsoeloxor/+,h 5l rface 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 coefficient of static friction between the boxes?

  An object is on a frictionless inclined planbs (09 -aiqy3x*pbalje. The plane is inclined at an angle ofl3y0-sa(ia* xjbqb p9 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that m m7f1u2 xwo9.)sxijx yakes 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 incli/4j ;b97ptdz,/c secm vway-d ned 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 pla bg9w5hg-:o wyne 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, at a constant veago 4zbz4:( gkgye(x+locity of 6xzb ag(+ggzy4e o k4(:.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 rough -2;ylljqccsbc 35oa)$37^{\circ}$ 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 rob a( hs5fr/7equgh $37^{\circ}$ 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. The9::qyvds b r3p cable attached to the log mab9ds r:q:vp y3kes 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 nl j /,52aqsnda2v3 jv ;cayz.plane tilted at an angle .,; csndq2/v nz5y3avj a2jl aof $33.5^{\circ}$ 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 pl1; c czi vquk.m5ujp-3ane. The angle of incline is gradually increased until the object begins to slide. The angjm qv-c ;1k.cpu z53iule at which this occurs is q. What is the coefficient of static friction between the object and the plane?