Which of Newton's laws best explains why motorists should buckle-u7/-p (ohw49b+oyk juwgdq/jbsz/ h2, sz 3stkp?

  When you sit on a chair, the ..0hdm kfg9io resultant force on you is

  In the absence of an ext./-nbqge i(nix po7i/5d y *gfernal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned offcd2+mr0dr4h 2ozb;fq uww9 ,d , while traveling in empty space, the starmdz ,hw 9+rcqord;db0 wfu22 4ship will

  A rocket moves through empty space in a straight line with w z,7jhlby.jiw qf qo1*.h:;a constant speed. It is far from the gravitational effect of any star or*,lfjzo : 7bq.y ;qi1.hwhwj a 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, fav2mgs v0ps(qt 3 n,asha(2xs, cing forward, and you suddenly fall forward. You can imply from this that the bus'm,s (32gn0taxa ,vs vpssq2( hs

  You are standing in a moving bus, facing forw+j knkw.4)r-loq i-i eard, and you suddenly fall forward as the bus cl4.wr) e n-ikkqo- +jiomes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motionx/drs vhl,4u4k.ft r0 of the object.

  The acceleration of an object is inversely proportional tutzov:(lcocp +b70pb a 1s +q7o

  A net force F accelerates a mass m with an acceleration a. If the ss.kw nx5*/r o1ct *qnzame net force i*z.kc/s x*trn nw1qo5s applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acsr9 0d,pv q3lqceleration results if a net force 2F act90rd3ps lqv, qs on mass 4m?

  If you blow up a balloon, and then release it, the balloon will f0: - dssaj7 7fvwjgg4wly away. This is an illustrativ 7j7dwsf 40:gjsa -wgon of

  Two cars collide head-on. a/:);vu cypk 6dqn2t7dd:qa wAt every moment during the collision, the magnitude of the force the firpa 7;v6d a/yq u:qwk:c)ndtd 2st 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 of

  If you exert a force F on an object, the force which the object exeryj; +tc; bp3ckl7r m-k/. lpbjok 41jbcq3qo5ts on you wij. lcb4lkqp1+oto yb/kj5 q3 7p;jm;r c-bc 3kll

  Action-reaction forcevan1:*ecnx t 4r( hwbu38vz9 gs

  Action-reaction force/mmh0+zs l/q5ko1v ehwi +rh0s are

  A 20-ton truck collides with a 1500-xm4 uavewafe ;*dz5*8v2i 5zo rze(d3lb car and causes a lot of damage to the car. Since a lot of damage m4dee(f 5*5adzaovi;ru * 2z8e wxv3z is done on the car

  An object of mass m sits on a flat table. The Earb7n3c+ eqa es1c4 0e lsw-myu4th pulls on this object with force mg, which we will call the action force. What is the reaction fu0c 43m 4q+1eyb7w- n leesascorce?

  A child's toy is suspe,uyb; 5eeh8m :eha7xsnded from the ceiling by means of a string. The Earth pulls 5u8x,eb y hhe:;se 7amdownward on the 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-Nt c8mg6ze 7t8h,ain t9 instantaneous force. The ball hits the bat wit7 m6nt89iatt,e8 ghzc h an instantaneous force, whose magnitude is

State Newton's threej jl-r5m; u-6khe0duhzxoa/* laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than ou//ziyz u(+vox1yz 3fn Earth. Which of the following is true about the mass andyyo3ux/(zz 1z v f/iu+ weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distanc+kfa op upuq+2yb0- x)e is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weigg,bfbs,8z 5d jro: 8ouhing 600 b d zoor8,8,ju b5:gsfN?

  A stone is thrown straight up. At the top of its path, the net fai t94wpm6vpb(h f -;uorce acting on it is pf;t6uiwhp-(v 49mb a

  A 20-N weight and a 5.0-N weight are dropped simultaneously f 4b(ltx:) )z:zp kdjfrrom the same height)) xbr4pkzlf :d:j(z t. Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal v n;w6am coq9trjsz (54elocities. Which object experienq;(am j9 5rc64zno wstces the greater force of air friction?

  An object of mass m is hanging by abl)r 2uw mhjin41 tuz *+- -sjc8x;yru string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the *wz 2lb+uurnxsrj)1-t-mi4 jh c8 ;uy string?

  An object of mass m is hanging by a string from the ceilx3.sh 1f5wc7 pa.bk4uypy (l oing of an elevator. The elevatocuhkb7 sl1.5f.y xpo p43 ay(wr is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewa qm*96hdeir3 elk is

  It's more difficult to start moving a heavy cartoqcyk.;tx ;te+a 5hw 4yn from rest than it is to keep pushing itwk;;h+xcta4 e yq5.yt with constant velocity, because

  A horizontal force acgl1jdcgskxw,v g;: .rq9 jr8* celerates a box from rest across a horizontal surface (friction is present) at a constant rate. The experime9rvk. ,glg;d8 q1j:cx sj*wrgnt 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 ram(qvlx i,:trg:wm8-dl p at constant velocity. Thus we can dv,l-l:irtgwq8md(x : educe that

  A block of mass M slides 3yph(lzrogf926 h d-pdown a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted byhz(l93 py6rfdp h-o2g the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q wk5g)thy ,3 qwdith the horizontal. The normal reaction force exerted by the pqh3t,dgw5) y klane on the block is directed

  A block of mass M sl8som: i nr,zthrz8497ek bpuzej2o ((ides down a frictionless plane inclined at an angle q with the horizontal. The gravitational for8(ziz(e:jt e op4r7ob2hm,n8 zs k9ru ce is directed

  Two toy cars (16 kg and 2.0 kg) are releaserfvjt.j/ 1awp ,r7tquv .x byea35 t*/p.tr ,rd simultaneously on an inclined plane that makes an angle of 30e wi u3 yvx atr/r.t. wp,jp5earvq,j* 1r t7/.fbtth the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionlesus z1shdn 3j 1/co-qvs7oau;2 s surface. A 16-N force is applied to the object, an s/su21sqcj- oan;u37zvo dh 1d 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 tojb pij+g 0:aq 4b*4auug +lq2o 27 m/s in 7.0 s. What is the averageb0aqi4a2 bgjq+j4p :ul* g+uo forward force on the car?

  Starting from rest, a 4.0-kg body ree6k )efqyhn0(c(ur: naches a speed of 8.0 m/s in 2.0 s. What is t h :n0(6)ckeqreyu n(fhe net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket ezm 2fgo cx 6(n)fn6+ewhich acquires a speed of 50.0 m/s after travelingg c2fe(+6 neozx6fmn)
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 from rej ho:iauu 4j;;st uao;u:4jji; h,

  What is the mass of a person who weighs 110 l -xnym-k;1tmt b?

  What is the mass of an obje- 7;yl fly0qrz34 kaywcdpo** ct that weighs 250 N on the surface of the Earth where the acceleration due to gravf* qd0l7y4 p-kora;y*cyw3 l zity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the obje6uqklw )w7 v89 linn0eia7v4 oct on tlwni 7oi7vk6aql4)9ve un80 whe surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weiz)n21yp qbw;)gs7pn tghs 40 N on the Moon. The Moon's gravigq)1 ytsz pnn7)2;p bwty is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war bx6qg dq/btja.++ m y6oy pulling on opposite ends of a 5.0-kg rope. Sue qtqyg/6.ja6mdo++ xb 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 on a level frictionless surface. A force F acm8bs+4) yo tm ymy6bi3ts on the stack, and it am6m i84ybt)o ys3+y mbccelerates 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 7zi1j73ac owc -ko*qn +b tz5rthe scale be reading when the elevator is accelerating downward atz abo-t 1*35 zrcn cq7joi7+wk $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60. d8(ew25crry,lt2lp,q+u ret.lfk8c0 kg and the ele,ec8r cldr tl +2pe yrlq5 f.kt82w(u,vator accelerates 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. -q :u(r br-bd;jkvkn-:br i( j If the mass of the person is 60.0 kg and the elevator a ;-i: -rdbrnuvjk(jk(: r-qb bccelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forceu -ej w4q/qsn8s act on a 5.0-kg mass. One force has a magnitude of 8.0 N andwun8jqq /e-4s is directed due 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 acdd*n5q+r+o flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontadn+or*ac5+d q l 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 szd-h 2 tl0.9pi uo/ayrests 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 the load is not to slide ft-/.uo pd0a 2y hi9slzorward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.63bma lg)q8n kvd;p(ze-tg 8g70 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pu);gm n(l73pz 8-vggeb8a tdk qlley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 q;g:ei;assc . kg, what is the tension in the string? (Ignore friction g: sec;a;sqi .and the mass of the pulley.)

  A student pulls a box of boiu*3f u .vzv 7glu()dpoks on a smooth horizontal floor with a force of 100 N in )3 vg.if*u(puzlu vd7 a direction 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 force of 1 v mw2:ge+cd2lb87fcc00 N in a directionb mc wc+vl :cdg728e2f of 37.0e above the horizontal. 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 supported by two ropes as sh oc 4jpcutasp: y5 o4)iv3x55iown in Fig. 4-2. What are the tensions in5ivcpo55xa y4:3 jti copsu)4 the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the i254rppezdx: i:w :gdmass of the traffic lii :w54:xdzdp ep:gri 2ght?

  Two boxes of masses m and 2m are in contact with each other on a fricitv g/jo ( ,u*,zd1 g*eghc) ba9,oa :gjwao)ctionless surface. (See Fig. 4-3.) What is the accelerao*iw e)oa1gdab ao)gcc,g9j/uzt* :,v, g(hjtion of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless05t+6 jfbguhm( nkfj0, h +rcx surface. (See Fig. 4-3.) What is the net force on++00xfu jbnj,h(rh cm5 fg6tk the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If t6d2.5q do bxh1qwgo5tv: e;fohe forward:ovgqeo dtw5.2 6dxh1q;5b o f force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4 p/-pu(a (ijp-mb -7es)qsy fo.) If the forward force on the more massive box is ) -b7 sp efumy(s-p-q/(oijap 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. cgpc(34cam9/v oa8 xwddgg ce; se3,- 4-5. Box I of m e ms/ced84ggva (oc-3xca;,d3 cgp9wass
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 friudfsbvl,u;;j4lb :de vq h)1(ctions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force ons),(dd;;ub qhj lf u1vl:bv4e 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 0.50c4nl9d+c -vmq and 0.40, lc-d+qv 4n9cm
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 surj jm1pb06.wo xface in the +x direction. It slows and comes to a stop with a constant accelerati 10mp6jxj.b owon 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)y7w/)t4 dlt:vhuwlq6ae ,zi pulled by a 5.0-N force. A 3.0-N friction force retards the wt ia:lq/vw l))ed6h,t 74uyz motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, p-l2 yy1p mo2mg 9*tzmat 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 slides 5: g9fmba t2f7r(vi:b c0 m on the ice before it stops. What is the coefficient of kinetic friction bm(2fgr:vt9 cb7iaf b:etween the puck and the ice?

  During the investigation of a traffic accident, police4/k*w4w ns tbsexx07e find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500b *e7k/ssw xnxt44ew0 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betweebrrni6x2 3 -f1omob2 dn 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 12 bo n2d3xbfmr- 6oirbox?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The kvq0rr0 ky j5h2o4p;9px mic: ,vu+wpsurface 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 v2x9r u+w,k5hpq 40j; r0miop yk:p vcon the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless incli4 :vgob exr46zx9.pogned plane. The plane is inclined at an angle o.x4v4 z6e g:9poxgb rof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat mgs 77+, y/y1hvfigi chill 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 a vfuy*84 il/wingle 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 i9fd 3*mxk f*hlnclined 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 f plfe6th r.jh,) /y9*ny .rjvdown an inclined plane, at a constant velocity of 6.0 m/)r.rl6 tp.h* fhe/v ,fy9njjys.
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 sltlo qq wf24p,9ides 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 slides down a roughu4 t65/wff * pftzc/ pc, sqfrz)v(8st $37^{\circ}$ 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 ay0t2tke:9 x2 z6 )l qpnnao:uhlong a rough surface. The cable attached to the log makes an ay: o9enhqn )p2: x0 2ttkzula6ngle 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 ,df4+*fx l mz*k ez2tptilted at an angle2dlz+z xe,mftf 4p**k of $33.5^{\circ}$ 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 incline is graduazov1wd/* 3d,jaqd-z. 7e - xs8j tmoowlly increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient s,z-e83d-azovwt / qd j*ojx.7dowm1of static friction between the object and the plane?