Which of Newton's laws best explains w/5n0rhun3;q* ibh i rfhy motorists should buckle-up?

  When you sit on a chair, the res anmnvwq ;:h-.-hmjz5ultant force on you is

  In the absence of an external force, a moving object will7)hcu3trfwk 9,em la9zo5 lz*

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sudden hux.)t jo:fj8yy;x, rly turned off, while traveling in empty spactuoh) fjyj.;x r, :y8xe, the starship will

  A rocket moves through empty space x0m ac jyd. 6xnu1tu0 8umb u./agv/-j4lpuc;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 .xu6aacjlu- pm/j .xubdvyu u m;0 /0n4g1c8tapplied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, a(cez 9*nrm 0band you suddenly fall forward. You can *nec90 zmba(r imply from this that the bus's

  You are standing in a momgb .1upysyfw1jp ;02ving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. Wh0byym1.;1w 2gufs ppj at force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the obz 12a.c-b yih0;ejlhiject.

  The acceleration of an object is inversely- upjprd 6+xqw 03nw1jn w*m7fbm:8sy proportional to

  A net force F accelerates a mass m with an aaef w ,a--skiv)bx0-wcceleration a. If the same net force is applied to mass x- )-vi0sfa,k-ewbaw2m, then the acceleration will be

  A net force F acts on a mass m and prfkkrw9e t5/uup r)e 7d 7gya58oduces an acceleration a. What acceleration results if a net force 2F acts on mas)gd5 k 9wapk7f8eu7r5u /etr ys 4m?

  If you blow up a balloon, and then ro1e pc,azvh,14oiy d )elease it, the balloon will fly away. This is 1zyi ce41hdva,p,o) oan illustration of

  Two cars collide head-on. At every moment during the collision, the magnitude ofk/v5y3wz . nyh ;eajm; the force the first car exerts on the second is exactly equal to the magnitude of the force the second car ex3;m.ye /w ;5jayknzhverts on the first. This is an example of

  If you exert a force F on an object, the force which t24 wbxt/ii4cphe object exerts on you will iiwxc2 b4p4t/

  Action-reaction forcew 6vc39hx s(c/3uueej,q9fg cs

  Action-reaction forcrmr (or(vr-8 xq7f do(es are

  A 20-ton truck collides with a 1500-lb car and causes a lot of 3ud) c laa fyx0-8a5ptdamage to the car. Si58ad-y cptauf)x a30 lnce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Eart(94vqfx*h dith pulls on this object with force mg, which we will call the action force. W9 (ifh v*q4txdhat is the reaction force?

  A child's toy is suspende bu05j:ky ;z1pjub6gsd from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. ujz 160kp5:; sgbuy bjIf this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous )ifab6w4m 8qfylsk 5.t2dfizwn: 9,y force. The ball hits the bat with an ins wyw iz:q8ds42m,ki5flfn6y9ft a)b.tantaneous force, whose magnitude is

State Newton's three laws.ht)lpvz4tn*89kmk i 3rc69/ 6s tbvrf

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Whic/ t:ctnlkdb2r t0k2v,-s0(m/ yfwu iah of the following is true abouf m/(t0 w0tuds yb: ,akvtnk-i2lr2 c/t the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dimpq tsp(/-i o/nq5u3 ynake 9)/n)qvp stance is

  Who has a greater weight to mass ratwegqe uf7 +x 199n+rotio, a person weighing 400 N or a person weighing 60+n xfo7+et 9r1w 9gque0 N?

  A stone is thrown straight up. At t :wv+x p13nm6*obd efrhe top of its path, the net force acting on it ird vom :epnw*63bx1+f s

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the y+3;xnewz q*v same height. Ignore air resistance. Compare theirz3 x+ewnq v*y; accelerations.

  A brick and a feather +k8tj26rn7u j mljjb 53)bcih fall to the earth at their respective terminal velocities. Which object experiences tncj2jm)b7+3 lbr 8jiju5h tk6he greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of avin(ltzywvy7b+g/36kanh .2 n elevator. The elevator is moving up at constant speed. What is the+n/azg62lvbv3itwn.7hy (ky tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. ++s3g32c jj vsce +y)h7*w3zexrveu rThe elevrs jyvujc3hg*r3wx 2s7eecz+3+)ve+ator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you xz-rl 2s -8s-ryp0p*c:sy ikpfrom sliding on an icy sidewalk is

  It's more difficult to st f x4w;0n-e.yhvr/to e gu(7toart moving a heavy carton from rest than it is to keep pushing it withe4 . f(uo et/yowt-x0rv;g 7hn constant velocity, because

  A horizontal force accelerates a box from rest across a hor56ed bl4 zfck5 +vohc8izontal surface (friction is present) at a constant rate. The experim86ef4c o+bd5clz5 h vkent 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 gsqwd5;m- -lq+djjn) can deducedm5+- jqqgndj )-;wls that

  A block of mass M slides down a frictionless plane inclined at an angd3 onjc2h9+qh le q with the horizontal. The normal reaction force exerted by the plane on the do 2h93j+cqnh block is

  A block of mass M slides down a frictionless plane inclined at 04i/xtkd d)nxo3 5p clan angle q with the horizontal. The normal reaction forc d3 /i lcp5ox4ntdk0x)e exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined lh4w8 - pr)0eeo0akhukxdd9,at an angle q with the horizontal. The gravitational0wr)4ueo 9 xkh,alk8h-d 0edp force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneouh 21wvyn n 3d4crrs8fqbc59,ksly on an inclined plane that makes an 2fh3n5 wrqn d9b8 s4kvccr,1yangle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A (r9c +mv9z zthor0s e+16-N force is applied to the object+r+mcvtz9( eh0 9rso z, and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to +5 wmm; y (rkz6i9k(sn*oq dee;eu)uh27 m/s in 7.0 s. What is the aver+w * ery dinkz m)(o5h;ue(k6umq;s e9age forward force on the car?

  Starting from rest, a 4.0-kg bodisb2/ tl9 sklxs3uz .4y reaches a speed of 8.0 m/s in 2.0 s. What is the net fo92lti k. sz uss/34lbxrce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of melr 7bbd ij *;m/*e0p50.0 m/s after traprbm ;/* imde70*je lbveling
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 frov2n:t;ktle( 6 xy e.r3uqc uqdu;b74qm rest uu2q7d; b t xkv3e(q:;cq4.enl uyr6t,

  What is the mass of a person who weiga/d.wgdcw .kn78:op wd q:nce/b1 r7 bhs 110 lb?

  What is the mass of an object that weighs 250 Nh+lf2tq.zmk g ):ehc3 on the surface of the Earth where the acceleration due tomcg+2:3qfek.h z)ht l gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of t1,2)r rc wleou1q2k7tfqqr .bhe object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Eart2krtoc ewbq ru, ).112rl7qf qh?

  Object A weighs 40 N on Earl3o u;kmusjg,0 eh p g0 dg90onrr.x..th, and object B weighs 40 N on the Moon. The Moon's gravity is one g e0n r.sj.0xlro,mp ;h0u koug9 g.3dsixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.,e*5qdtjm 4uh 0-kg rope. Su* md45queht, je 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 oy)c2w eegk qc3x s:+62uf:chfn a level frictionless surface. A force F acts on the stack, and it accelerateuyseexg:f+ 63kchqc2 :w)2 fc s 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. Whatnc5+bvmfh -;d-dl :bo b q0h*8anvhk9 will the scale be reading when the elevmbl5+bb*qcn- h9nf-:k; do 0v8d havhator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If th0 ,e f k,hsc z.cx.1pz-qy-qaye mass of the person is 60.0 kg and the elevator accelerateh-,-sp yq,qc1a fy..xczkze0s 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 0ismv57; v . yn5axulpmass of the person is 60.0 kg and the elevator accele 7 5m ya;uvliv0p5.sxnrates 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 mlhgi+6z6m kz g vp:-i9ass. 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 acceleratioz6i+:v9g6- lmhzi k gpn of the mass?

  An object of mass 6000 kg rests isld lcjk 3).p y4s23son the flatbed of a truck. It is held in place by metal brackets that can exert l.lsd) s2si3j34yckpa 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 slide forward into the cab?

  An object of mass 6000 kg mu(,b-; cs qqu1ie o t(qk6;uxrests on the flatbed of a truck. It is held in place by metal brackets that can exeu;ue o6( s,xq -tci;mqq1(ub krt 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 the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 rjgio/fo7 he;v1 g*; fkg, what is the magnitude of th 1/fgr *j e7;ogvoif;he acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.6we )k;38 ,vsf1jokdeq 8yy t3x0 kg and m = 0.40 kg, what is the tension in the stringv,x8)yk k 8 3d1yejqwof3et;s? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on xuru3ra 52huv1qe. )ra smooth horizontal floor with a force of 100 N in a direcx51arvr) u u2hq eu.r3tion 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 with a forcwcm *gv ie9opt4;iul-j zf2* 8e 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 force o*opi;ug wf8ztml4vi 9-j*e2c n the box?

  A traffic light of weight 100 N is supported by twoepv*gc m4( ft2 ropes as shown in Fig. 4-2. What are the tensions in the (*pcm42tvg feropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of th/7u equ) . dd0o phip-9+ugouke traffic ligde u / +7pu9kdug.hu0 iqop-)oht?

  Two boxes of masses m and 2m are in contact with each other on a frictionless xac 6xjjx2hoi4 i cf z:32zu6v0av+a:surface. (See Fig. 4-3.) What is the acceleration of the more2c30zi 6iv o:j:2xxu4f6z xvaa ca+jh massive box?

  Two boxes of masses m and 2m are in contact withds + fet0pk9f/ each other on a frictionless surface. (See Fig. 4-3.) What is the net for9pkdt0se ff+/ ce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig.mziq u0b ;d7/d 4-4.) If the forward force on the more massive box is F, what is the tension b7d/;du0m z qiin the connecting rope?

  Two boxes of masses m an1xlyevus ss j7)90 -msd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is t1x ls j)u7 msy9ss-e0vhe acceleration of the less massive box?

Two boxes are connected fj6x:df -*.e*wajad1d w n1 hmby a cord running over a pulley as shown in Fig. 4-5. Box I of -:*.m1wfjdheaaf1d*6 wxnjd 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 kinetic frictions b nmk h6m7zzcp)zy1*m+etween a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box 1h)+zzmyck* 7z pm6mn when a 15 N horizontal force is applied to the box?

  The coefficients of statiqc)ul7dv4 xsbo7 94 dwm bds26c and kinetic frictions for plastic on wood are 0.50 and 0b6d mb42vsdd 97q)o4l7xs cuw.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 to hu )e3)72ah9 tfn8qlpwa m5) d fcds5fa stop with a constant accele fhdfhl f)c3ea 9 ns) 7qp5t2uwdam)58ration 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 surfacerbbd-* wq2 hu8 is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleratiohw82r d-*buq bn of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a sw 4m ru1j:1jeb2qmo )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 givenh7wfqwd.0l , d/yb telw :i,w9 an initial speed of 10 m/s. It slides 50 m .lflw/0 dww:hy,i9be7,d tw qon the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid hgo n7u p2:5rdmarks 90.0 m long. They determine the coefficient of friction between th5 np7gru2 ho:de 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 saj m:v 3ab/-gbh,n:m qtacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface n3jh-b, :mamg: aq/v bis 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 box?

  Two boxes of masses i e6ktz-l2id,p5a et:m and 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 slide on the more massive box, what is the coe2,elz5 e6ittiap - dk:fficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined at annuq8 9wsc :xl4 angle ofsl9xw un4q:8c $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a fla2s80 ldmc k5:v8 ebsxtt 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 smozq;i6ev cl .li,:k6c koth inclined 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 incli /7/ nu whfpvevtk4 np;z)fo,(ned plane 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 djd/yr;41:e4fsa.f eohzu yys f7 bb2/own an inclined plane, at a constant velocity ofoef/4yhjbuf :2df arbs;1 7/ys.ze y 4 6.0 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(pfqups* cckbn:o 2 55x /mdexp:*q8i $37^{\circ}$ 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 djzw3mm;j2yyo3k2 l70 /14q pdhut xtp own 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 ni;l;s hsqqe:a)) v ;g500 N along a rough surface. The cable attached to the log mak s :;;)e n;ihlqavs)qges 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 incline741s dk k2k4zwf xq+ aywbz;+dd plane tilted at an angle obx4+s zy7q1;wdfk2 wa dz+k4kf $33.5^{\circ}$ 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 ini mzq p1 ieu2jy08xa 69+zvgk1cline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefzxuz61vi amp j g0+e2q1y8i 9kficient of static friction between the object and the plane?