Which of Newton's laws best explains why motb7 kph 46w5zgborists should buckle-up?

  When you sit on a chair, the resultant force o-08xwni;c cbyn you is

  In the absence of an extj jz/*;qx puq*ernal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN arb;dn2rq+ok2 pnp(k 4t e suddenly turned off, while traveling in empty space, th+qnp2or d4b2 k;kptn(e starship will

  A rocket moves through empty space in a s mg: v r6m/(2wjvur(smtraight 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 its motion vr6r s mmv(mg/w: u(j2is

  You are standing in a moving bus, facing forward, and you suddenly faf qx/5/otue9xll forward. You catuxo9fq /e /x5n imply from this that the bus's

  You are standing in a moving bus, facing forwahi1il--,xohbta+ ib4rd, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fit,obhahx b1+-il4 i -all forward?

  A constant net force acts on an object. Describe the motion of the objejtixd i7/wnj5ik 3+kop0 o;c0ct.

  The acceleration of an object is inversely proportion ls*h :l,f;f 06vqacmoal to

  A net force F accelerates a mass m with an acceleration a. If the same netn-q yzeui9 i0i*h9 qpjy; 2w/a k)dczsuz63w/ force is applied to mass 2m, then the acceleratz9u6h ds9 u3yii;k2zq0w*/jwnq p)e-c y azi/ion will be

  A net force F acts on a mass m and produces an acceleration a. What accc trroh1mc ,9gyee*9gjm 2m4.eleration r99e2j 1mt rcm*. emgy,hrgo4cesults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon wih5dblon*c x 40ll fly away. This ihlb0 *5 nd4oxcs an illustration of

  Two cars collide head-on. At every moment during the collision, the,b z(r7nau;rx ke n0/e magnitude of t (a0 /rne,nxkzubre;7he 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 of

  If you exert a force F on an object, the force which theuadq3 w- *b6kz object exerts on you wiluwq 36-dzbk* al

  Action-reaction forcezqik2u p, /ik3s

  Action-reaction forcviy.k4k 36txhes are

  A 20-ton truck collides with a 1500-lb car and causes a lx r(h q9.+ds,rhhxm2got of damage to the car. Since a lot of damaghd.9x( gsmr2hrh, q x+e is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object8a7wl; pvv r a,8urot4 with force mg, which we will call the action vr48a8l,7a oru;twp vforce. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a hxpb,mtr.cs79av5j 7 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 "p r .9macthb,vsj757xreaction force"?

  Your bat hits the ball pitched to you with a 156ao:)t 2k xcqdfd:h (t00-N instantaneous force. The ball hits the bat with an instantaneousfx2 aot(k:c: qh 6dt)d force, whose magnitude is

State Newton's three;jia( i:weees1d,( q6+lovw c laws.

  Mass and weight

  The acceleration due to gravity is lower on the Ml dt6 u:po+vku ry/lr 1x,2vo0oon than on Earth. Which of the following is true about the mass and weight o,r1d yr+oko 2tx/0l6uv plvu :f an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance isy iqk/yq(y+ 3nq(olhq6a0 i 3z;8wngf

  Who has a greater weight to mass ratio, aqu,y9e5zz/bamnv , uap5h y+- person weighing 400 N or a person weighing 600 N? 5v5pyhmez-/a+b,uqy,u a z n9

  A stone is thrown straight up. At the top of its path, the net jf5aaio l+ 6oabk u;g:h1:bz/force acting on i/b:+ou6 a1:lk;zjgh af ia 5obt is

  A 20-N weight and a 5.0-N weight are dropped simult 6 1wdq;bhnx4e -rs-ananeously from the same height. Ignore air resistance. Compare their ac rbd nseh1q n4;a6wx--celerations.

  A brick and a feather fall to the earth at their respective tei: w pp4jax4x1rminal velocities. Which object experiences the greate4ax4 1:pwixp jr force of air friction?

  An object of mass m is hanging by a st -g/+t0d vh zb qyir9kjy(7u+cring from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the strinz9+g(hdc0 / k jqbt7i+ryy-uv g?

  An object of mass m is hanging by a stri2-mv xhi ts1 -70zybqing from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tensmyh t0s-i2q 7-iv1bzxion in the string?

  The force that keeps you from sliding on an icyn 6)k;3n,6hnzfa*9fgxwrmfu sidewalk is

  It's more difficult to start moving a heavy carton from rest than it isug0 wt3ns- 0yx*(kezg to keep pushing it with constant velociu-gtnxy gskz30*w(0e ty, because

  A horizontal force accelerates a box from rest across a horizontaloju:/2 wz ks:l surface (friction is present) at a constant rate. Thel2u kw zo:/js: 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 +c 2s 6y*9t4fo3na sk n,lf lo2klkg;dan inclined ramp at constant velocity. Thus we can dedual oosd+;,6lfcsg 32k4ftn29ykl*n k ce that

  A block of mass M slides down a frictionless plane incline+nun:1yrx o-hhxycp+ u;y 1 5qd at an angle q with the horizontal. The normal react1;+ xy xpuh+nq-yu1o: hnyr5cion force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q w7 ew)wnyo6 ,+12d xx:-jeb gnkj 09r:ndgn ypqith the horizontal. The normal reactiog pxy b,o x-y0n91gejednn:n)r7wdj q+k:2 w6n force exerted by the plane on the block is directed

  A block of mass M slides down a frictionlesso6ei,aq/bu51t rx1ik plane inclined at an angle q with the horizontal. Thq56 baoeui 1/1xi rtk,e gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclij cucovnv.++ a* x*f4mbg;1x kned plane that makes an angle of 30e with the horizo1ucc +vxvbma+fjg* n*x.4k; ontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A z,,ou(j p e7 yi)8 zww23hoif,fd,psm16-N force is applied to the object, and it accelerates aji,,fs)u7od,2 f 8pe i mpzh(3z,wywot $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rescicf5a4 ok)) ut to 27 m/s in 7.0 s. What is the average for) 5f4c) ikcauoward force on the car?

  Starting from rest, a 4.0-kg body reaches a sp,nbg bggd))1 xldsk9*eed of 8.0 m/s in 2.0 s. What is the net force acting on thexl,) bnkbgd*gg s1)9d body?

  An antitank weapon fires a 3.00-kg rocket which acqui o/j,qwbfrao) xja 3t/49sh9bres a speed of 50.0 m/s after travelin,jtxao4)as3q/ who/ rjb99f bg
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 thexad9v,sfidg**b a 9 3tw/1p0i k nsi4w same force that you push a 10-kg mass from re9 af ksnw/pidwi*sa xd9t34 ,g0biv*1st,

  What is the mass of a pers 5.exsp*. ;xw :tf ,hhhbyzcc.on who weighs 110 lb?

  What is the mass of an object yq9gz:c76a 3tixada3that weighs 250 N on the surface of the Earth where the agaazd33yctiq7:x6 9acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is (o1:endof5f 0js4) phpjxnv j8a(ap8the mass of the object on the s5paffa :p 80h1dpx 4ojvn(jojn )(s8eurface 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, an n6:-7ckc ;ur+evxjmfd object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the m +cnmf 67kvx-rj;: uceasses of the objects.

  Sue and Sean are having i-,u+goy1js v4pzjw iq/ n0o: a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What isp1 q0oi/v4+n ,souy:w zgi- jj Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a le,.y nd1hnc kk ye*f2v+vel frictionless surface. A force F acts on the stack, and it accelernvk 1,c *+hed.nyykf2ates 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 thjqlsg31 0h1ag /z.kwie scale be reading when the elevator is accaghqj l3.kgz1/ w 1s0ielerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of thdvv d txbd3x2w 1dg5-3e person is 60.0 kg and the 5 xt wg3d1d2b x3v-ddvelevator 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. If the mass of the persowpzwxpy,d.po j nv- 6l9d-7g 2n is 60.0 kg and the elevator accelerates upward with an acceleration ofnpgpzvx.7 o6-9,dpw2 -w dyj l $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces aco-mfc+ 5ut vl5t on a 5.0-kg mass. 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 acceleration of the mavmt-o 5luf+c5 ss?

  An object of mass 6000 kg rest3,lgdqjr1x+, gv kc x*s on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum ho*3jkgd,lx cxrq g,+v1rizontal 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 rests on the flat yutgo72 *zuev1/3onzt+ l lk3bed 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 forwanoe+zu yuz3k7 ov t 13l/t2lg*rd into the cab?

  In the Atwood machine shown in Fx +*wb yipnne2yu7*2gig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is tbi u*yxwyn 2 eg7+*p2nhe magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40- 5fsnk rpun+ru*g/, x y/t1uy kg, what is ryn + utk*rxg1 /nps-,5yuuf/ the tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal6ttb 8shzqc-f:7(dm rh)fqk: floor with a force of 100 N in a dd) sk t:fzbc:( 7-mt6fqhqrh8irection 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 )a/ohtd)8,7a lffvnkonjp t5szz1) 2with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40z jakf ) )ahn1 nf/ts,8voolz257)ptd.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. 4-2.bb,q*;1/dte ac 1sqkm What are the tensions in the rope*at; /bds1cb1e q qmk,s?

  In Fig. 4-2, if the tensions in the ropenz/k -j-* nsrhs are 50 N, what is the mass of the traffic lir*-- nj /nzkshght?

  Two boxes of masses m and 2m are in contact w:g 6a1vivz*ttkgve163m)n qe ith each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive bone :* 3)61imegvqv ztvt1 a6kgx?

  Two boxes of masses m and 2m are in contact with each otqpy r1(oi41ru;ot*r b95 sl7 tbid*lh her on a frictionless surface. (See Fig. 4-3.) What is the net fol*rls poi4159t7 dubiybh1( ortq*;rrce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the fb /-j* j+ry7xmy4 drhzorward force on the more massive bx ry *-rm/+y7bzdjj4 hox is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connzapz kh4 sqwozt65uh:n9/2l4ected by a rope. (See Fig. 4-4.) If the forward force 9 qzuz24n pk:oalh4hs5 t wz/6on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running ii: 2ayu 54;incwx q6:eml2 etover a pulley as shown in Fig. 4-5. Boxnee5lit; iyu2 : icm:4a qx26w 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 and kinetic frictions between a 3.0-kg box and a deskca g7ev igh(5btt. f,4 are4,t i5 fbgtg7 va(.ceh 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of s b*mc -h-p2tkbdi1m: oebh0t0tatic and kinetic frictions for plastic on wood are 0.50 and 0.k: tm -0hhme1-b*0cdp b2iotb40,
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 surface2j a u.hjae26)h)smee .ekr +h in the +x direction. It slows and comes to a stop with aekj+hsem.j hhe.)a r2 a6e) u2 constant 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 pulled by 8y .k )c;dlt;abja b:sa 5.0-N force. A 3.0-N friction force retardsb:a;;yc) 8ajtls kd. b the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from vtwkqok.v7 b0 uzi*mkn5. ,+hrest, 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 giv(gq ;2.hp1d 7u ng xutun*urg8en an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic f un n uq7pgg; h1.ugt28u(x*rdriction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks9*j+ 7un ,wguu)d:coi;xgtc zn 5 ,gvfx3s+eg 90.0 m long. They determine the coefficient of friction be 3f,75guc *xjceg;n+o 9nv t+z,uxis)g ugdw: tween 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 3m are stacked. (See Fig. 4-6.) Th;/ e 1 jj5cifiw9zq3bte surface between the more massive box and the horizontal surface is smooth and the surface between the boxesqf35;/ii1bj wcjtz e9 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. 7l .j .lx q1m4axwmwsg,,i.a i(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 lelx1x iga,iw.7q. ml,4 m jswa.ss 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 plane. The plane is incline*9i9gd adcpk2w 0)yyp d at an angle9cgwdp02y dk9*pi)ya of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angx-ye( 2qrgp ro2) ;bdnle 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 plabs:u6c ,eov /mui7*e fht37w pne 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 smoot21b qq+k zl; rixl0/zsh inclined 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 down anv bpjb d86-cq907g mtn inclined plane, at a constant velocity of 6.0 m/s-nb7tqdp0cg 9j 6m8vb.
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 ro5; 5s8eg 5tbcd 6lhlxohw-x7iugh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slsn-c k;.c mqf*ides 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 surfaced+frrmu z6/t2+ljb q-k)f x;x. The cable attached tffx;qt rkxr / buz +j-d6+l2m)o 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 p qr/lano; c7xme- )9dno-;l(nf zm f+rough inclined plane tilted at an angle (-cr e- aqlflnz)n onom+x/pd9;m; 7fof $33.5^{\circ}$ 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 incli-ylxl :s0g*/j -b am (czi22pf5qnyj gne is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object -gly f:bn p52x(lyj2*jmcq agiz/0-s and the plane?