Which of Newton's laws best explai .rx r215uxxqsns why motorists should buckle-up?

  When you sit on a chaix /jme( nj f:v1yu9j+*ak *pjvr, the resultant force on you is

  In the absence of an externa5uc1l+tfguz yb1*fn3f g1jq * k2mdq 8l force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddzl8 t+ vj(9ryhenly turned off, whilh8rvt +jl yz9(e traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant fci+3e*f3 d ;e(uq(s jvb-g8pqama2z 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 tou 2dfv+ b c*gm aq(qf83sip-3jeze ;(a sustain its motion is

  You are standing in a movikwmu)bp 1i 9i(ng bus, facing forward, and you suddenly fall forward. You can imply f) 9(m ubi1pkiwrom this that the bus's

  You are standing in a moving bus, facing forwarh*e* y.amrto ru 9b,t;d, and you suddenly fall forward as the bus comes to an immediate stop. What force ; *eryuhrttbm *a.o,9 caused you to fall forward?

  A constant net force acts on an object. Describe zps +:z0fc 551r zqazsthe motion of the object.

  The acceleration of an object is inversely propor3 fjtz3;wkqo2 5iweb9tional to

  A net force F accelerates a mass m with an acd6s1j+4xdubw 0a+ o kyceleration a. If the same net force is applied to mass 2m, the4y01ujs6aw x+kbdo + dn the acceleration will be

  A net force F acts onaij,. qimckp, /gb82g a mass m and produces an acceleration a. What acceleration results if a net f/ q,aj2mgi .bc 8g,kiporce 2F acts on mass 4m?

  If you blow up a balloon, and then releah 5oe8-fgv) uetyl u :s5)2s7bpmv6zb se it, the balloon will fly away. This isb )zluem8h2- s pbveyvfso6ut 557 g:) an illustration of

  Two cars collide head-on. At every moment during the collision, the magnitude oaujc -i64c w;y;jofd1 stw:+l f the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example ooyl-cs41c;jd6wj u +i:w ft;af

  If you exert a force F on an object, the force which the oax)holm 3s8l0 oc), olbject exerts on you wi loo0xlh 38c)a,l)s moll

  Action-reaction forcexoc9,(; efumbq7s(nc ool* )m s

  Action-reaction forces n 6rrj)a2yd0care

  A 20-ton truck collides wigkko/*d5h(dkpermjl +v9 .. lth a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is kv kmpdr..e hlkg+j 9o *5/ld(done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object :+i )yrzk-yfrwith force mg, which we will call y)r ryizkf- +:the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Ear37 c7hhwue0robki * laf(w6q1pw pq9 9th pulls downward on the toy with i h7ipo7hr*kc(qw3qw1la 99p fu 0bew 6ts 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 i s.da o8odns2+nstantaneous force. The ball hits the bat with an instantaneou.o2dsd osn8a+s force, whose magnitude is

State Newton's three lawb qm07wiueu k/xli (0:s.

  Mass and weight

  The acceleration due to gravity is lower on*ge6f3p vfjs*cm z4htegs .8 o6fx6p ;n; a0sd the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut octz.3pv6*h0*;n jgsee4om 66x psfs8 ;dfafgn the Moon's surface, compared to Earth?

  An example of a forcei c01te)ov1gdo40 glh/t7fhu which acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 40 ii2/nm;mguyh*j ;,bt0 N or a person weig;,iih/nbjuyg *t 2;mmhing 600 N?

  A stone is thrown straig*5un 9ody5fb3thhm +ve;;;io x tg)y rht up. At the top of its path, the net force acting on it e5y;;ih;dv *oo 5rfht) +y9nbuxmt g3is

  A 20-N weight and a 5.0-N weight are dropped simultaneomnlc2 cf*a9p d *-zcglq6n)o0usly from the same height. Igno-*lm 2cocndgfp*0z6a 9c q nl)re air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal vexeibrl3t( e 74mfvfe 44 vp7t)locities. Which object experiences the greater force of 4e)tf xft7vi vl4e(7pm34breair friction?

  An object of mass m is hanging by a strinf.)sa: a*iu2o xg w(dgg from the ceiling of an elevator. The eleafu .)o gas(2xwd: i*gvator is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string fromohapf20,ktt * the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the *ttk0 ,hfpo2atension in the string?

  The force that keeps you fromrmykzn ,y*9t2th4 s+l sliding on an icy sidewalk is

  It's more difficult to start3miixx 6dtke,9 q toe6 9332jzgf8rhv moving a heavy carton from rest than it is to keep pushing it with constant velocity, qrdhoz3 3exgemv2 j6,tx9k it 9 i6f83because

  A horizontal force accelerates a box froi x,pebn ug2 c3 hf0a0.l,nt(bm rest across a horizontal surface (friction 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 t ,btilu0(,0fbax2hec3pngn .he box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Th 0b8 0ed gy1hhys6o,oeus we can dbeg 8yh s,he0yd16o0 oeduce that

  A block of mass M slides down a frictionless plane inclined at an angle q wi czdw b/2kf:nfd.3 y,ith the horizontal. The normal ri3c2zkn by,f/d :f.dweaction force exerted by the plane on the block is

  A block of mass M slidv7ny163f pu*u.qpvngc a -ez*h tn*e5es down a frictionless plane inclined at an angle q with the horizontal. The normal reactionc5uu*n1ea 37 *qevpty -* fhgvznp.n6 force exerted by the plane on the block is directed

  A block of mass M slides gt;v f6xev) 2*ef+ peudown a frictionless plane inclined at an angle q with the horizontal. The gravitationaef+e p ef2;g)6*vt xuvl force is directed

  Two toy cars (16 kg and 2rpz7gr4c wsd, c1ik 1i+se+g6 .0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being release gr14 6dii+ cgk p,ss1zewc7r+d.

  An object sits on a fricti9 a:jnv4ugd+v5a w t 5og72ayponless surface. A 16-N force is applied to the object, g 52jd naoa:475yva tvp+9wugand 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 27 m/s in 7.0 smox* kb5 1-wftvumm w*l.v ,1m. What is the average forwmbfum5* mto1w*, 1klvvmwx-.ard force on the car?

  Starting from rest, a 4.0-kg body reaches a speez.65ehlc ard0 gybl,-d of 8.0 m/s in 2.0 s. What is the net l c zedhl0 y.,-ba5rg6force acting on the body?

  An antitank weapon firesah wh3ywj /6* zulvl: yumg()+t.yaa3 a 3.00-kg rocket which acquires a speed of 50.0 m/s after travelu6hmw l/y gh.ua +yvwj(3ta:3)lzay* ing
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 frjx*c 9pve j(+jom res9jpx+cej *v(j t,

  What is the mass of a person who weighsj(yye-a.. (aea7mhnm 110 lb?

  What is the mass of an tfk69fu*7hpz c7z p7hobject that weighs 250 N on the surface of the Earth where the accele7u9pz7p*k h 6tf 7chfzration due to gravity is $9.80 \; m/s^2$?

  An object has a mass /kc lsf3gzjw0; bk*4v of 60 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gr v/4ck0fsj;* klw zb3gavity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth,dn*-n3:- p:ba c (xn-kxolwxd and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth*w: c xd-onlnb 3(:kx-d-npxa 's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war bv2nzhpkg7 o62 8u-4x t z,oijby pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N ku6h82,4t -o2zv 7ngixbzjopforce. 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 surfacuddsn 0vmzwf*it3un78s ., u6e. A force F acts on the snsmu z,n w iusdu7dt.v0f 6*38tack, and 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 elevasp7 xp5 ,)z)foddkg )qtor. What will the scale be r) 5))7fkg dqdz spoxp,eading 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 pe3ctjg3;a ksylpf9. 8vrson is 60.0 kg and the elevator accelerates3.a9;kvy3sj f 8plc tg 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 th(jha *r o/wp9ae mass of the person is 60.0 kg and the elevator accelerates upward with an accelerat/*9 rawjh pa(oion of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on end,vt+61v eu9hn *oda 5.0-kg mass. One force has a magnitude of 8.0 N and is directed d ,9ved1t+du 6*enon hvue north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000tbpb2( hn cngg ,t44:m 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 15 m/s, what is the minimum stopping distance if the load is not to slide 4t(ngbtmp h,cn2g4 :bforward into the cab?

  An object of mass 6003i8dc/i0 lb4nd l+kje0 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 15 m/s, what is the minimum stopping time if tk3 b4d8l jilndi0+ /eche load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.6 kv,g p gre4jh)sv7r.,0 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the vrhvjg,rk7)4, .esg ppulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 ks s-f 4rbe29asdee82a g, what is the tension in the string? (Ignore f2eee da42 s9s-8bs rfariction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor wm o; ;6a y0yky4jey1ulith a force of 100 N in a direction ofe14j; y0k ;ymol 6auyy $37^{\circ}$ 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 witzgj qj kum mjiv(*w77w (bak;q)i/(x8 h a force of 100 N in a direction of 37.0e above the horizontaqzwi8gmk j7q( m; v/xk(bj*)j w7ia(u l. 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 supportr/+ lj2a vhex5ed by two ropes as shown in Fig. 4-2. Whal aj2r5h e/+vxt are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass gvdq86q9 l i4u8baqt/x f1 wb4of the traffic light?91xbvqaf qul6t4 /q di84w 8gb

  Two boxes of masses m anoc,:t k0lmy 3x/bvx+aa r4i+td 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What irty/,:ov kt ax3 l0xb+4c+iam s the acceleration of the more massive box?

  Two boxes of masses m0 id189i st,uqc,vptb and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massive b but9c0 8piqdv ,t1,siox?

  Two boxes of masses m and 2m are connected by a +ewp pq: k)gr 6th4f*irope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in 4tp*)6 pw:kfrgie h+qthe connecting rope?

  Two boxes of masses m and 2m are connecte7cthwm- z6eld ;mpw8-)l sf:f d by a rope. (See Fig. 4-4.) If the forward force on the more massive box e8ptmclh )z m-7;d:lws wf-f6is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. Bvxk/uk) -gwr13uctwb 05bj j +owgj1ujk-vw t5)+xb0ckr3u b /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 sv.0i a o xkj:q2ers7m*tatic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on2*s kvax: oj0e7qr.mi the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for57xa(49 iu5bm noyr,hofcs : q plastic on wood are 0.50 and 0u,yc:orx (hfq nm a57i594b os.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 surfaceh03qgo.p4/o,8 ;jlqnvk c f;yje-en l in the +x direction. It slows and comes to a stop with a constant v;nc4pny l3k ,e; j0qooqjfg-e.hl 8/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 pulledb bm;lyn.2xzu8 :bbf8 by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of yx 28lbbzb.:nu; b fm8the object?

  A horizontal force of 5.0 N acceleratbs)8+bh7epsp aq-s phlp . h,(es 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 sliden :9451 fpsjwlpk/ x,v t/ydggs 50 m on the ice before it stops. What is the coefficient of kinetic friction between the pucy lsgv 9g4j p fktd:,5wnx/p/1k and the ice?

  During the investigation of a trb fyo6m q+:: ah6fs62nd5cpphg 7isj1affic accident, police find skid marks 90.0 m long. They determine the coefficient hm1cnsqs o7jba f5fd::i 66h2 +pgyp 6of friction between 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 and 3e(0/: t8qlbnfkbz l/w f)5lexm are stacked. (See Fig. 4-6.) The surface between th8lt q:zb f) we5kf/le0(bx/ nle 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 box?

  Two boxes of masses m and 3m ar bxgz; .x+7ot cfz;,ay5(ogfze stacked. (See Fig. 4-6.) The surface between the more massive bo gzf .ya;t5gz;o7cbxxf +o(,zx 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 coefficient of static friction between the boxes?

  An object is on a frictionless i9aoeh*iw4ma8 1k nlz70/ ;drff 6qv dxnclined plane. The plane is inclined at an angleo zk;h 68f rmda4ew/d*7019n afix vql of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat 1mz pboesouy 2bvu820s,z4 3r 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 plane with an angd y/kz6aqah u2t+ilmf u )zw--v7.j1gle 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 tilte3x*-x, h 4csa, r0 sj*/ov*tiojqmpzw d 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 veloci0s +b kgs d0-fq.sde;uty of 6.0 m/bg d0eqdu.k0;s +-ssf 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 wy.+u5m2v.adw nrh a2slides 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 s 7 yb81cx6xwx d+:g dn0pkvj2rlides 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 surcrftc, fc;- 3oyb /v3cface. The cable attachevt3cf/ ; b3coc, f-cryd to the log makes 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 inclr:*6o(uyhpz( 3xvaj v ined plane tilted at an angle oo v6*v( phyur3x(jaz: f $33.5^{\circ}$ 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 in*mjxery4yrhz atx o *;ykd 7/mi,5m0*cline is gradually increased until the object begins to slide. The angle at which0moak;rmyxd, *j*etym *4xryh 7 /5iz this occurs is q. What is the coefficient of static friction between the object and the plane?