Which of Newton's laws x)3wot5 ztannkc64 jq 3jx;k)best explains why motorists should buckle-up?

  When you sit on a chair, thwuz lm66o4bi 8,9c pwme resultant force on you is

  In the absence of an external fxc0rj pi- +afn0 vv)(force, a moving object will

  When the rocket engines on ther dlky/9o6q0z starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the sty9l0o kz/6d qrarship will

  A rocket moves through t/yt(l w,2 rt;hqoo yliqzn19ke4 .-j empty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these con 4 ql92r/ozti 1qn kt-tjh;.y,o (wleyditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a movk 4n0stap3v)umn k(cwg(nu zy.0 7v.ling bus, facing forward, and you suddenly fall forward. You can (vy sn v.cuu3pa.n70wtlz4k() mgk0 nimply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall fvlkdf qut:ib72c 0+ k8orward as the bus comes to an immediate stop. Wbi+0ku:c7vqk 8lt df2 hat force caused you to fall forward?

  A constant net force acts on an obj12st-lltx w g1cef36eect. Describe the motion of the object.

  The acceleration of an 7d h q7esct0u9object is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. Ifz7j18-mq8u z2osdw gu y+d 0ed the same net force is applied toedz8dsj7m2qz8 gydw 0+uou1- mass 2m, then the acceleration will be

  A net force F acts on a mass m and produceugo)wug /j*o qjk25laq3awlwd 1:u6+ s an acceleration a. What acceleration results if a net k1luo u62a 3ggd*w+jo5)lqwujw/q:a force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloonq/jwb+)t5g :p r(qvw owfu*o4 will fly away. This is an illwqur(45go*t pov:w/ fbqj w+ )ustration of

  Two cars collide head-on. At every moment during the collich lhnad 0nk744 sghafk h7e 3k+8u8m,sion, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of 44kf0+, cak3s e hhhnad mn 8lghku787the force the second car exerts on the first. This is an example of

  If you exert a force j5m/a97wnl/ m qwluh( F on an object, the force which the object exerts on you wil7l(jnl9q5 wah/wu/mm l

  Action-reaction forcespcnl+ 4.m ,zcn19 nyha

  Action-reaction forces ark0wr9g5k+ (y da;cc rl;1qjuze

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the carb/kxipsk+ )v 7. Si+ i)bpxvk/k7 snce a lot of damage is done on the car

  An object of mass m sits on a flat table. pg8/p0 qxl dk; mad(k: The Earth pulls on this object with force mg, which we will call the action force. What is the reactk:p k 8(axq/d;0plgmd ion force?

  A child's toy is suspended fr11j:t sve0k cv1f9gxmom the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reactio1:0v s9 mcjtv1efk x1gn force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous frtkgvw3 hz 4j +u-g)c+orce. The balc-z3w g hvt+)rug4 kj+l hits the bat with an instantaneous force, whose magnitude is

State Newton's three lawszj2b1-uwg:d i gry9 ,lm (j4rm.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than kfm/acem*,icy( .h i e/305a3kssk bc)jx.c lon Earth. Which of the following is*y5befa/k3 s3c ai(c )hi/ ml.ec., j0mksckx true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whichzcn7 .hnlmr tx2 ;(mg6 acts at a distance is

  Who has a greater weight k8*ptrn4h ypdtxc6s0w vq:;- to mass ratio, a person weighing 400 N or a person weighing kp;ys4r td t*v:c0wp 8-n h6qx600 N?

  A stone is thrown straight up. At the tl xgdqx9; rv,4op of its path, the net force acting on it idq9xx4g rv;l ,s

  A 20-N weight and a 5.0-N weij52hrf4d pnu-ght are dropped simultaneously from the same height. Ignore air resistance. Compare their acce r52d4funh-jplerations.

  A brick and a feather fall to the earth at their respective terminalzb 7w5 xu6 lr/-cd+xdu)r)ms j velocities. Which objecu5)du d-m cl6r)w7 bx /rjsxz+t experiences the greater force of air friction?

  An object of mass m is hanging ppmk:ye ec7li6b a .u5g5gr) 5by a string from the ceiling of an elevator. The elevator is moving up at constant speed. W.eeby 7igu5klg ):6c 5m5ap prhat is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an x0 hp ,hf 2 4w(0 xdxwokkadpx27w;p+velevator. The elevator is 02v 74kx,axh0k2 d w(dhowwxp fxp p;+moving upward, but slowing down. What is the tension in the string?

  The force that keeps you)4n5erhcpe. (f w6ceo6 x)/n br wt7fa from sliding on an icy sidewalk is

  It's more difficult to start moving a hau/01kh.z v6,dq hjsfeavy carton from rest than it is to keep pushing it with constant velocity, beca0hkfjzhvq/ 1u.,d as6 use

  A horizontal force accelerates a box fromora.4f12zzd/s 9fx qp 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. Whatdp x2z9f fas.4o1z/rq happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocith es+rb-+ zso ;6jumo.zs 3.qny. Thus we can dedusozqben3+ ;s u .mjr +s-oz6.hce that

  A block of mass M slides down a frictionless plane inclined at an angle q wiv -pr-qztbz,e r m4 :+n2gg,uxo5uzm6 th the rv-g, m-e u 6nzztmbo54 ux2pz:+rqg,horizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M sli8zezq 02b mu,h)cg9hthw.)v edes down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block i0eu .g2z qzmebhw)htv8,9 c h)s directed

  A block of mass M slides down a frictionless plane inclined at an angle q wt-t h bzq,vg:od *n*qyh:/( awith tq: htyhnvwqzg,d*aob(:/ *-the horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) a7vgz:+ojvu v. re released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their accelerati v oj+:gvzu7v.on after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the obz(vr/ bm,r *6mp8lb4n1bw anaject, and it 4mrvla6* n8bbpw maz rn( ,1/baccelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate./7 )b s(o twbwsebdw4 from rest to 27 m/s in 7.0 s. What is7/w(wbset4) o w.sbb d the average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is chh;6q:h,o )tivlyr3the net force acting ;:lr,vh)ti oc6 3hqhy on the body?

  An antitank weapon fires a 3.0fc3w/q98c2/d2fpv qvty n 9cqxr 6db70-kg rocket which acquires a speed of 50.0 m/s aftqc vdn9q87/c fvxby2r 9wp6td/ q23cfer traveling
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 pusho7u ,8i gait,.kxva*12n ub mk a 10-kg mass from rest,,k nt uvia21k*ma,ub g7ox8i .

  What is the mass of a 30fjn o fx.r5 )h.cvopperson who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth /9m8hj9is 2* l/9 w zpf9 kdt2jwhelxkwhere the acceleration due to grxkm/ 2 fl i9k j8t/ewjw*h dlsh29z9p9avity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass 4rckurmr1/ev6 3m0n gwz+z bik,h5 4 hof the object on the surface of the Moon where th3 rh4r,+ wb5mzimv40ckzk gr16h/ nuee 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 on the Moon. Thefp*y;p43n-osm)u iucyc 6e8m Moon's gravity is one s8-m f;4y 3su)oup pcm*yeni 6cixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of lbt9kaov9o. p/) pq y+3ubsa(uv4hh.a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue ublqou k/(4h+9h9 ) .ap y3otabp. svvat $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface/rkzx+cph 1i5. A force F acts on the stack, and it accelxzpr +kh1/i 5cerates 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 ocrbrgt z3 -*d8n a scale in an elevator. What will the scale be reading when the elevator is azt3brdg - r*c8ccelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevato)f /mz; ey:dsbr. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleratze bsd;mf/:y )ion of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If ndsfg+b-1d.1 8n pxs x(an5o9gmas/qthe mass of the person is 60.0 kg and the elevator accelerates upward with an acceleratixbs9. -1a8x5gdq( n sgfa1dn mso+n/pon 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 8.0 N l/b; 0k(cl s- mku8jtaw:4hqwand is directed due wkk4-alj hs ;w:mtbcl/(qu08 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 6000 kg rests on the flatbed of a truck. It-( w/sxyf dcaog7tzxi+1lx4, is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is tw4(sgf y/ d l zxt7oi+1xxa,c-raveling 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 rests on the flatbed of a t:tr u(rtt s,/yruck. 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 the load is n,y:str urtt/(ot to slide forward into the cab?

  In the Atwood machine shown i4)td jdty;yiefw 2 .m8n Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleratwyd)ftmd 8 i2 ;e.j4tyion of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown i)5ifbxzg,e2e6gl 1,j nig 4shn Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore fris1efxhj g5,i4gn ,l6)gzbe2 iction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force of 100fp j( qqqn/1g7g21i xb N in a directig7/pjb i qgf2 1(xqq1non 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 tfqiivf 1l9a21z;)f c2s5te awith a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 4i5i ql)t2v czf1fs;91tfea2a0.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported brn cvbp d-ns6)ei-s 74y two ropes as shown in Fig. 4-2. What are the tensions in the s7 -nvrp ine)46d csb-ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of ) hvxsicu+ddppw5 gn.vo+svqp; 28.+the traffic lightd+.h2 5;ioxpsv )s .n8+dvvgu pqpwc+ ?

  Two boxes of masses m j5joo+u:01lpme;y eo and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What omee+05uj1p:oyo; j l is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictiov+pygv/ w(s-b nless surface. (See Fig. 4-3.) What is the net force on the v-sywpb/g+ v(more massive box?

  Two boxes of masses m and 2m are con0p;lh;yuq00c7u+3 kriw z sfjnected by a rope. (See Fig. 4-4.) If the forward force op 7 ycri+l;;qshjzk w0uf03 0un the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connecteg z4h*)so: m p;b+kpukd by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is thepzosk * :p)4kb+ugh;m acceleration of the less massive box?

Two boxes are connected by a cord runnig+npqaw 0a60oexzo y zcl4-5l31kc n)ng over a pulley as shown in Fig. 4-5. Box5egwno l xkcl4+ 6y 1a0c-qz) z3apno0 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 static an25byivvzqo3ca. /p) jd kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.bqv ajv/i2co5yp. 3z)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 plvwvc 23fy15doastic on wood are 0.50 and 02c5wdofy1v3 v.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 lkjo4)-sla1g revel surface in the +x direction. It slows and comes to a stop with a constant acceleration ofkjga4r) so l1- -$2.45 \; m/s^2$. 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 a 5.0-N )xv/qp4 p 3hvcforce. A 3.0-N friction force retards the motion. What is the acceleration of thep3 )v4pxq cv/h object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass,rsro1/ yv9ao4 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+vv 9h6wz lyiym9bu jv38x :t0ni-v( r. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between t bn-mivv(3i zu 8xy9:0vwlvr+hj69y the puck and the ice?

  During the investigation of a traffic accident, polic0d+)sydub ;c +uunu9ie find skid marks 90.0 m long. They determine t ) u+cb d9udinus;0u+yhe coefficient of 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 pr6gcak6d(h h(+dhw (and 3m are stacked. (See Fig. 4-6.) The surface between the more h( kr+dh6gc(ha pd6 (wmassive 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 are stacked. (See Fig. 4-6.) The surfac 42qfynf mc-o9lol( l.e 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 coefficient of static friction between the .(lm2qol- f4lo9n yfc boxes?

  An object is on a fri f2zzj5b 5n2 rib1j0fy st(za5ctionless inclined plane. The plane is inclined at an angle of y jztjs1r02a5f(fn zzibb525 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makesvsm80 gj. vqgb r)cq1- 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 eg9o-7zoq l6g.f. v afan 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 tiltedii6xb i+b -i q8n99lio 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 g x :+fow.3lvlvelocity of 6.0 m/svlw gx3. olf:+.
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 downelmez.r52 l +li+6d4m/rb tfm 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 spn1km /b1 0,tb3bhufolides 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 55 tqubk no /xv4h)1a9g00 N along a rough surface. The cable attached to the log makes an )g qbk vn4u9x1to 5ah/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 tiltedq);u.hj) acffq3-(ex ij : omq8ue +el at an angle of x3e juoimj q +8)e c;:u-l.)fa qe(fqh$33.5^{\circ}$ 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 incnggm 8o *4:pjg a-t8 krx22sv2fumg5iline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction*g48j 2gkf g5vs2:omr 8ua-n xp2gitm between the object and the plane?