Which of Newton's laws best explains why motorists sxfrcpgiob* *ds : ;/5rhould buckle-up?

  When you sit on a chair, the cdg6lk( s.y( sresultant force on you is

  In the absence of an external force, a mo lxfu(ih4(y 1isdj-b;m+6xarving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned ofu7nm-w8 qce0(op,.m lo0q y fff, while traveling in empty space, the starship. 0wufleo70cqq(nm py,m8f o- will

  A rocket moves through empty 6 ;m.uoh-fo.7m k yelsspace in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these cond.fk u o67me;moyls-.h itions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenlncmw8 )cez674f7hehx(kfo:h y fall forward. You can imply from this that the bus' ff6)o8z7 h7 ehexn4:(wk mchcs

  You are standing in a moving bus, facing forward, an)d0m5mr5ynx20c y udf6vs u0y6 ooo2 dd you suddenly fall forward as the bus comes to an immediat6 0c5sd)2 y uo5y d2m6x0nymofovu0rde stop. What force caused you to fall forward?

  A constant net force acts on an obja( 2t) 2s scm84xvwthqect. Describe the motion of the object.

  The acceleration of +3 d72zfe mfu9wio-uman object is inversely proportional to

  A net force F accelerates di,:yoaa:: jnx 0l7yo+iy: lja mass m with an acceleration a. If the same net force is appliedi:7na, y+ l: o:iojjdxya0ly : to mass 2m, then the acceleration will be

  A net force F acts on wce-9:k u p+a-s,:jrjx,j b yma mass m and produces an acceleration a. What acceleration resulukjb+,wxaysr pc-j: e ,9mj:-ts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. This ,ex1u or6 d,ybjs+ r5jm8hd+a is 8j+ ,xdj1s5hoer+urmba,6 y dan illustration of

  Two cars collide head-on. At every moment during the8b. 4mde ,7cw2slfljo t (uazga,-d q+ collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second carab,dd( cm tzs7,low a8-j 2.qe4gluf+ exerts on the first. This is an example of

  If you exert a force F1 +vvlv(o ;v9lbh t/v bzm2ahl5mr21u on an object, the force which the object exerts on you wi(1v+b mvv1/om r 25llhlau;bvtvh9z 2 ll

  Action-reaction forces tcxn 8n8p(m;olf (;fy

  Action-reaction forceeel+c 9o5j.danr c.ok11/a zos are

  A 20-ton truck collides with a 1500-lb car andc 8)hdw4nw7d h causes a lot of damage to the car. Since a lot of damhwh4d7w8 d n)cage is done on the car

  An object of mass m sits on a flat table. The Earth pulls s0p2ts tcprbnz+ d1 7dd)6g- jon this object with force mg, which we will call the action dsdr cgn)6p1-t7zs 2b t0pdj +force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of 0qza;jd2 +ac v6e,ltja string. The Earth pulls downward on the toy with its weight force of 8.0 N. If te,+cazt2ajdjq 60;lv his is the "action force," what is the "reaction force"?

  Your bat hits the ball pitche 17a9 utk:jkqzyx.v.m sxm;v)d to you with a 1500-N instantaneous force. The ball :axs; kjv.m) mqyz1 xvtk7u .9hits the bat with an instantaneous force, whose magnitude is

State Newton's three l- lhjx+47 p55uqpcgyoaws.

  Mass and weight

  The acceleration due to /z* cql+z )+h*i7m vqm9rc-ptw x zcp:nv8kt3 gravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of tw9 xc*+cr7mkzzi 8lqvtq znp +mcv-/:*h3 p) an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dist:mvzvb: h1ui3ance is

  Who has a greater weight to mass ratio, a person 6-qv/k3nxd -b.s ppbb weighing 400 N or a person weighing 600db-kb/b.6spq- 3xvpn N?

  A stone is thrown straight up8od1k7krz6cy3q 3qvh. At the top of its path, the net force acting on zk8oq7yhdv 3136rkqcit is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the saz7l*9kr 0;6g3qmh mh nkce7bzme height. Ignorerz he6hmqc9l 7g3 *nk 0z;kmb7 air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respecws8du 3-msw1ctive terminal velocities. Which object experiences the sw u-cws13 m8dgreater force of air friction?

  An object of mass m is hanging by a (1/pehr)m+mgl sg0 +lbp f0castring from the ceiling of an elevator. The elevator is moving up at constant speem gl)0m1 h 0/e+cbslapg( r+pfd. What is the tension in the string?

  An object of mass m is hanging by a string from the ceilingl+9z1cxkp1,bkb w8 oqo) .dpt of an elevator. The elevator is moving upward, but slo1bxzd+1.9o)8 ol bqcwptk, kpwing down. What is the tension in the string?

  The force that keeps you from sliding oecu6,ky / xwggb,l79on an icy sidewalk is

  It's more difficult to start moving a heavy carton from;mtjx z es(t3u53cep8h a v,9y rest than it is to keep pushing it with constant velocity, because e,3yt z;samxp3t(8e9cv5u hj

  A horizontal force accelerates a box 1xqmez-lle:(h6mg m ega )e 5i5e0tl8 from rest across a horizontal surface (friction is present) at a constant rate. The experime-:81 qgem)0ee(glmeelmal t 5z6 hi5xnt 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 dowj,)yh iy qu8a,n an inclined ramp at constant velocity. Thus we can deduce,uyh)i8q, ajy that

  A block of mass M slides down a frictionless plane inclined at an angle q.pjd 7ork* ubofmndo,8l/4y e 4v 8u4k with the horizontal. The normal reaction force exerted by the plane on the block8y4,oo.dknpeo4 / urvm 4b8k l*d7juf is

  A block of mass M slides down a frictionless plane inclined at an angle q with t tm*uoq(uo .b-he horizontal. The normal reaction form* .u(-oqbt uoce exerted by the plane on the block is directed

  A block of mass M slides downl*pk+6wku,: 7i 2v/ wl sk4p:lr trskq a frictionless plane inclined at an angle q with the horizontal. The gravitational force is6w 4ksvtrkil:lw/s*7r l q ukp+k,p2 : directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an incliiimy (e 9,aj/d0z ee;oned plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being releas di0 iya9;mo/,e z(ejeed.

  An object sits on a frictionless surface. A 16-N force is applied th 1sz+6jceh)o o the object, and it accelerasz1 )+oh6 hcejtes at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate frome cq -./oj,n77rtpgef rest to 27 m/s in 7.0 s. What is the avr7-fj7,no e/ctgepq .erage 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 f:gr:1mmxdetq7 - snp061ex r is th76 : e:1geqrspx0trfm-xndm1e net force acting on the body?

  An antitank weapon fires a 3;sysi;ficx6;vu/wi5.3 kp78t0 iog ;wwae ra.00-kg rocket which acquires a speed of 50.0 m/s after travel gii;o/7w awi; xi ur6. av308;se kf5cws;pyting
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 16. a:c /qdlbae( kba8d0-kg mass from rest 8 6(a.addq/cbbleka: ,

  What is the mass of a person who wefr.+sz c3kd s/4 q- sm9s4zg:9utb weuighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Ehz1, po.2coze pr :do0arth where the acceleration due top. ,z 0e1do horc2zp:o gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is /zbzho- :p+frthe mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the E po /rb:+-fzzharth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on 1w1ov sky-e9 ythe Moon. The Moon's gravity iss9 1 owk1eyyv- one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite e9-dui1;sb1/y 3n ogwkyukmjqy74 b9tnds of a 5.0-kg rope. Sue putbm914 k/dyksi3uqj;obw yn79y -g u1lls 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 f08f1xs1:yis e i*dcj l11oa lb-x-bcl rictionless surface. A force F acts on the stack,oly:c8 dl0sixbfba1i11lc e-x- j1*s 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 stand;p9 3 bfk8 nsru/o*febs on a scale in an elevator. What will the scale be reading when the elev nosb*prbe9ff/k3u; 8 ator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale k.ncpi,zi 4 9o ibz2p3rides in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration of.oiz cpnzpi 3bk24,i 9 $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. I f0xn .umvem)2sj*p +ef the mass of the person is 60.0 kg and the elevator accelerates +ufm*2exvnjs) p. 0emupward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a fx,tjzb +a7s 0vi)fb, 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 ofbjsa fbxf7zv0+i ,)t, the mass?

  An object of mass 6000 kg rests on the flatb r oofaub0i*86q b3ev: yq3,iwed of a truck. It is held in place by metal brackets that can exert a maximumab,83 :o woqy360 febrqvu*ii 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 rests on the flatbed of a truck.1r6rn *i:ppet It is held in place by metal brackets thatterrp 1n :ip6* 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 forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 k9sj0/b d h1ta; wfc.atg and m = 0.40 kg, what is the ma 9fat;j0s btw ca/d.h1gnitude 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 = 0.41*tt bj5k782xijd0 ;wfecmw a ax:,g m0 kg, what is the tension in the string? (Ignore fritawj:tf5a 82 b*ej10k ,7dmwxmcg x;iction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a forc/jld gznruo/ 07k5*h ee of 100 N in a di/h jed *7ng5/k0rzluo rection 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 obfy av y32/:dxf 100 N in a direction of 37.0e above the horizontal. If ayvfbx 2 y3:d/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 rop xwfc2pq8+.nv fxxf:2 es as shown in Fig. 4-2. What are the tens 22x pqwncf.f:x+v fx8ions in the ropes?

  In Fig. 4-2, if the tensions in the rope:l9; w:,s xzeasvk s51u sn*cbs are 50 N, what is the mass of the traffic lightx ,k9s *w;1z slc5e :uvsbs:an?

  Two boxes of masses m and 2m ar00l :p yz/uhs oqv(vu/e in contact with each other on a frictionless surface. (See Fig. 4-3.) What is ths uyvlp0v:o/qz/h(u 0e acceleration of the more massive box?

  Two boxes of masses m ands r ft81s9hi b-st;mm0 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force o b9- ;1ist8hst0rfm smn the more massive box?

  Two boxes of masses m an4 e+dw71cwp kwsisl.l,/ bau ;d 2m are connected by a rope. (See Fig. 4-4.) If the forwardwsi bp,kdlcw7 awel;.4s + /u1 force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2a)fp8w 1rmm5:kz xw. w+mx9bbc nd; eme+5a f;m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massmnm9d ex ;:)b+a.5r zw8apfe1w+;m5 k cfxbmwive box?

Two boxes are connected by a cord running over a w)outq7di1 k +pulley as shown in Fig. 4-5. Box dkoiq) u+7w t1I 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 betweefzn:ik h3ob93 9mwxjj:3sno8n a 3.0-kg box and a desk are 0.40 and 0.30,:ih3jon j9 9fx:ws o3z38kbmn respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static andx// pzgvgfl, 3t *p1 :*mkoond kinetic frictions for plastic on wood are 0.50 and om/tgfz 1kpd n*/v: go *l,xp30.40,
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 k5: o rrt y75yto+ine)comes to a stop with a constant accelerationto :5)5rei7nyktyo+r 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 horizont y9 al csjr:9hlc:)th3al surface is pulled by a 5.0-N force. A 3.0-N friction force retar hc9y :9:rha)3clt sljds the motion. What is the acceleration of the object?

  A horizontal force of 5.0 Nj(2hp/f.s-y(wu.lfl20s xrb i5 yhg t accelerates 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 anjj6 0zhjfr8c ,l;xsk1 initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic fricti81xrj ,6hszjj;fclk0on between the puck and the ice?

  During the investigation of a traffic accident, police find skid mar xc7lxk.h4 *hbks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimatl7*hb 4xxhk .ce 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 betwsfkt 00pc*3 pfeen the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. kt300* psfcpfIf 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 surface between v8:w(fo 9-vxj sr pea6the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less mar xv 9(p-se8ov w:6ajfssive 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 i68ye4k kg :osfs inclined at an angle of 8k6k4o:sg y ef$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hil abtc)bp/yfzoj,.60dh7 7 kfceo y1y 2l 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 sm1ay* 0fwzy qc7 n 2kkjgj;2oi.ooth 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 inclined plane tily mdklr8a nr;05dy ;/:l8b mtqted 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 veli(kc3as; l .ciocity of 6.0 m/s.( l3 i;ckicsa.
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 slideom/1vy cm 8* syw.o.wus 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 do4k 93(7u phoyo qs)mpxwn 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 surface. The -e)l5pr umvq; cable attached to the lu -rlvpem;5q) og 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 releas,cqv3w)cu t f8ed from rest on a rough inclined plane tilted at an angle qwc 8ct,vu)3fof $33.5^{\circ}$ 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 inclp5v , p;rx z9qkl3rk*eined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs i5 zqk*,9r rxek p;3lpvs q. What is the coefficient of static friction between the object and the plane?