Which of Newton's laws best explaiarnc) zusp3s 37 gw59dx+x+g zns why motorists should buckle-up?

  When you sit on a chair, the resultant force onmcl j7e-7pb83c ifmz7 you is

  In the absence of an external.6 (bfg elusqk b7m8 nqqay1)- force, a moving object will

  When the rocket enginx7 q lr/kq*h.pes on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the./qkhr p7xq*l starship will

  A rocket moves through empty space in a straight line with constafbjj9v)yg vpa.+7y d7 +lo5drc 4f3 ilnt speed. It is far from the gravitai jd7+d vbfy3paf 4+c5 y9.7gl)jrolvtional effect of any star or 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, facing forward, and you suddeni sdte6ah.9syc/od -a,) a, jbwj+j1.lf d9gbly fall forward. Ydwbostj hb.)dgfa /9-. 1,is jy9 ajde ca6l,+ou can imply from this that the bus's

  You are standing in a movincv enx kbp4r 0+p5.8n2fywoaw2xdy7*g bus, facing forward, and you suddenly fall forward as the bus py2ed+2o7cpwvnn0*x. 4 afkx 5rw8bycomes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the omjco8l0tw (f fx35l:ybject.

  The acceleration of an object is inversely proportional tkj2gw+ j 7+fmuo

  A net force F accelerates a mass m with an acch:)x,pq c3 kfg;p3apseleration a. If the same net force is applied to mppsa: )p33f; qgkh,cxass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. +zjisx)+k a42x,neu11 x suqk What acceleration results if a net force 2F aei x 1s ) +knjk2ux+zx1qs,u4acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thilx 6s ;qjil)e8t-+:)yzjecisbki u1 )s is an illus uiq)k6j) cjls8exe:bsy il)-t+z;1itration of

  Two cars collide head-on. At every moment during tk/zz4 sqcpc; 0hlco i6;(p o+o;ab1fahe collision, the magnitude of kp(c;o+ zslfo/hzc6q;po1 i4ca 0ab; 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 of

  If you exert a force F on an object, the force which the object exbnfbww qra 1i-o42ruf2k3sz+,u 9rh6erts on you wiw9irznqua 6b wob24 k2ffus,r hr31+-ll

  Action-reaction forcesa/my204pr lxdh2tizvg*- xw1

  Action-reaction forces/ic o5xiu, k(gfkdy b:jt/ ,r9 are

  A 20-ton truck collides with a 1500-lb car and causes( jwns7a8d -2.( lb1(bw i6ufaohebgf a lot of damage to the car. Sinc-bf af (( s76.uel h2b(ib8w ajgwdn1oe a lot of damage is done on the car

  An object of mass m sits wz-. r:nag( nn rq2qul o2r80xon a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reactiwlq2q:80 nr-nzanxgo. r2u( r on force?

  A child's toy is suspended from the cei/nhz58ja *dix ling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If thixz/ 5jhnd*8a is is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 15,p:kx;e + 31lviemnip 00-N instantaneous force. The ball hits the l3ei;:kv ,eip+nm1 px bat with an instantaneous force, whose magnitude is

State Newton's threeaf ry/a 6j/p/rfo2 pr( laws.

  Mass and weight

  The acceleration due to gravity p+ql ah9:hec p6x8q8j dn-cl4i* xuw8 is lower on the Moon than on Earth. Which of the following is true abouu :hah9 +p ld-48 cnie8 p8jqwxq*c6lxt the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whichf0p+ hp,mpx /j-n ub9a acts at a distance is

  Who has a greater weight to mass ratio, a person wexvy,9d7o s:a ,ixvgy 9ighing 400 N or a person weighing,oy7vs,x y9ia 9v :gxd 600 N?

  A stone is thrown straight up. At th 59.x;mn gizyfe top of its path, the net force acting on iiznx5y.g9m; f t is

  A 20-N weight and a 5.0-N webaqtp-l; n5 3oight are dropped simultaneously from the same height. Ignore air resistance. C;5 3 lpnqtb-oaompare their accelerations.

  A brick and a feather fall to the earth at their respective termimmh 4p 3zsb:eb/7rcfz,1l e*7q rxv.inal velocities. Which object experience f7bse 13rle:v.zqhzc7mx / ,mprbi*4 s the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevtoy g49 ixbx307fdn/c ator. The elevator is moving up at constant speed. What is the ten b3goiy/7xn09cftd x 4sion in the string?

  An object of mass m is hanging by a string from the ceiling of an ; h64o0lkhavj elevator. The elevator is moving upward,6o h0hjka4l; v but slowing down. What is the tension in the string?

  The force that keeps you from slidingbi72:crzm3vrf 7hvrd6 lp*u7 on an icy sidewalk is

  It's more difficult toe19u(h q7j *xrqkxme * start moving a heavy carton from rest than it is to keep pushing it with constant velocity, beca71 jmxek*u (er9hx*q quse

  A horizontal force accelerates a box from refe6ah )*lf 1xkpp5z3est across a horizontal surface (friction is present) at a constant rate. The experimzp*53 6pe)hfle1ax f kent 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 al7j3nhp oq ;q;z0s0op bp3 :3bezjtb 9n inclined ramp at constant velocity. Thus we can deduco pq3;b: 9oe njl tsh3b3p7 ;z0jbzpq0e that

  A block of mass M slides down a frictionless plane inclined at an angle q ib mh-12zg0ihwith the horizontal. The normal reaction force exerted by the plane on hi1-i 2b0ghzm the block is

  A block of mass M slides down a fri0,ck* gcz8es kctionless plane inclined at an angle q with the horizon k0czg*ces ,k8tal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides dp hh2-o2z43a1 fj k,rwkez/i down a frictionless plane inclined at an angle q with the 3dji4wrh pz,k/o z-2fa21k h ehorizontal. The gravitational force is directed

  Two toy cars (16 kg and nrkrxbht+hb2 q*)j. v+g/b;a 2.0 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 +vqbrhtgkx) ;rahn+b2 /b*j .released.

  An object sits on a frictionlesd4o 7z0n p2zlmxampaca .)u4. s surface. A 16-N force is applied to the object, and it accelerateszpn0c.a zu447 2x)dlmoma .pa at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kgh.+l bviohbb+2l iiq w(.b-yoen5/j 3 can accelerate from rest to 27 m/s in 7.0 s. What is the averag (.yh5/o+. h+ijwlni23bevbbqi -b l oe forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed :siu*d71tyimof 8.0 m/s in 2.0 s. What is the:*t7id sum1 iy net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquire-fy5 yd*u rn5bmpl d2oz*h p2*s a speed of 50.0 m/s aft*z*5*d-2b25mpl ou ryfy hpdner 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 sxzmb7wgus , ,wdj (5t:ame force that you push a 10-kg mass from resgbj szwtm7 u,xwd ,5:(t,

  What is the mass of a person who weiaucupm-- ynq3izg22z 62g:lfghs 110 lb?

  What is the mass of a7;et-gzuxjbns -.fb (sc wk7 /n object that weighs 250 N on the surface of the Earth where the acceleration due to(ebgnsx ;zj f- b7stwk/7u.c - gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on thn 4/-*z xhgrjhy ) 7f00rkdvoce Earth. What is the mass of the object on the surface of the Moon where t-khg r xdz 40y*/v7cjo 0nh)frhe acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 Nvo o(2smqk0m( on Earth, and object B weighs 40 N on the Moon. The Moon's gravit(kvmo m (q0o2sy is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulliy/r 2 b gq/mbmx0v7wu;a1ad1d ng on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates to7m1qm 2y/xvud1 a a;/ gw0dbrbward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionles020qlpfbq jn+ s surface. A force F acts on the stack, and it acceleran2jq+qb0 f0pl tes 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. 8lnsrkrgf un5.om+ihb + *u..What will the scale be reading when the elevator is accelerating dolm+b+ n*u8 ifo.nu 5rrgs h..kwnward at $4.00 \; m/s^2$?

  A person on a scale rides ihjb19j+nda- in an elevator. If the mass of the person is 60.0 kg and the a jj+9in 1h-dbelevator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale r0m;z;v mvz.o mides in an elevator. If the mass of the person is 60.0 kg and the eleva;. zmomvm0v; ztor accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mavl*3iy *rp 9ezss. One force has a magnitude of 8.0 N and is direcp vi*r 3ez9l*yted 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 flatbed of a truckmey1az l)5u/ lalpx: 0. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Whenlez1 ux:a)l mly05ap/ 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. It is held izc br3*- py0.rolv3y+h *rcfan place by metal brackets that can exert a maximum horizontal force ofly0 h3 fpr*br-avr3.*cc+zo y 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 = oit0b3zg1g2/qnk:t ckhdk(k p7 *sv:0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frictionzvqi*0 k:g3 tn 7hck/dot:1 (pgk2bs k and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg 0 awi0l pmvxi2r8-+, dbk7hgg, what is the tension in the string? (Ignore friction and the mass of th+ m0-7d irlv8hb0pk igga2w,x e pulley.)

  A student pulls a box of books on a smooth horizontal floor withsm b/)h0ybz/i cif fz)ig9(3l a force of 100 N in a d)iiy)zl0mh/zbbs9 / g3ffi c( irection 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 0 1u apgd-(xvcof 100 N in a directiug p 1-0cxadv(on 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 shoyn2*o5divu86 k+ pdoewn in Fig. 4-2. What are the tensio2do*oivnk 8 dy +5upe6ns in the ropes?

  In Fig. 4-2, if the tensions in the rogl)ho z 8fumii+:9 gxr(c9g3io;n s3 xpes are 50 N, what is the mass of the traffic light?nc:f ogxog9s(ili+g; i )xmh83r9z3u

  Two boxes of masses m and 2m are in contact with each other on a frictionl 0oev 842u))qtg xakk+box.si;rmq0h n2q kk 4ess surface. (See Fig. 4-3.) What is the acceleration of the more massg k)vqnox2) iue8r 404qb. 2qmk0 hkt+axok;s ive box?

  Two boxes of masses m and 2m are9v7uced5*xe. 3 jkowxy57 x0x cajs-u in contact with each other on a frictionless surface. (See Fig. 4-3.) What i3xjwd .cec70s 5y*u- xuek9ajo7 xxv5s the net force on the more massive box?

  Two boxes of masses m a /xbp*nn bh2jhk64jv 4( +ca wwmro*0ind 2m are connected by a rope. (See Fig. 4-4.) If the forward fh 4+ c4awo0* 2rw(kbhbj*n /n6pijvm xorce 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 ropema1kt.z0 jq)j 5ph5r orvqup)h0ts7/. (See Fig. 4-4.) If the forward force on the more massive box is F,)p 0 05/smu rqpr. thjqvk1tao)5zhj7 what is the acceleration of the less massive box?

Two boxes are connected by a cord runnv 2+fufmqiy19o ogq7 na4e z+)ing over a pulley as shown in Fig. 4-5. Box Iovo i+g91q4f7 em ufaqy +)2zn 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 betweee/rb 1j-c3qrtn a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when 1tcqe/b -jrr 3a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood arewuu2(t)b3wte9 nj*rb 0.50 and 0j u 9)erwbnwt(*ub3t2.40,
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 directiond1w2 ioy i*iv9. It slows and comes to a stop with a constani1*2di ov 9ywit 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 a 1(p ci/(tay2mdm jkw. 5.0-N force. A 3.0-N friction force retards the motii a. pw2 1mctjkd/ym((on. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, frah *fg8v-:2wvbiem .h om 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, ar--3q0 t dig70yimumc.b d hgt -gjt6: puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck a - qdti6mm0 0-uih-b:7g3tcgdryt g.jnd the ice?

  During the investigation of a traffic accident, police find skid*; oh57)w3d:ev7o4 ugkwvvu 7qc th helv2 a9g marks 90.0 m long. They determine the coefficient of friction between the car'sw loteveu2:37uqg5 vkwov hhg49c)h7 v a*7; d 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 stackeywuuuo irr t2 ;a2 5:ybg18ox2d. (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 less massive box does nbw2u; 1 ouyxour :2tar85gi2yot 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 szkb.nl 5r l )( h48q4sw6ynpksurface 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 massins ( . 8hkbkllnp4z)6s 4w5qryve box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless vhccs*p+ 4ku8 inclined plane. The plane is inclined at an angle +cp*c khs84vuof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat h* +air1yh-p;c/oqvtrng /o5a ill 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 wr( .a06q(xky wfr;mdvc a3l2lith 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 smoothe;5 (5 cen2anp3ibyjm 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 an inclined plane,tj urf7in rop.g9z6 8n;( )idg at a constant velocity ofp7gjdf8 ( rrn6ig9.u);zotni 6.0 m/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 slidesy ay.4vzvrm.sy8o jq7 *n(td) 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 roughr5b lhx tg+yn1/a0n(d $37^{\circ}$ 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 50m:,fhdf ( -yug0 N along a rough surface. The cable attached to the log makes -hm, guf:dfy(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 7r2m2;ago+pi k b i5ieinclined plane tilted at an angle of mi;a gpib ki7+5 2o2re$33.5^{\circ}$ 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. 7jx,0yp3x ui b4ejk +bThe angle of incline is gradually increased until the object begins to slide. The angle at which tjb x4 +0xekjpi,3 uy7bhis occurs is q. What is the coefficient of static friction between the object and the plane?