Which of Newton's laws best explains why motorists should buby6gm-bhhz 6.h7 n f;dckle-up?

  When you sit on a chair, the resultant forc. rawv7ch xk-svpdr wd*3b)2o; -/xnae on you is

  In the absence of an external force5s 25+6duv pvxtu 6oks, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly t) aun4cca/km6y +(dqh urned off, while traveling in empty4am) (q kndcc/ 6hyau+ space, the starship will

  A rocket moves through empty space in a straight line with constant spe9/inwg3p hofd3 m. .jpjx*a5ged. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied ti3 xw. *p/ nm5j.ap3go gjhf9do the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you sudd:- 1qjeq0zzewr:p j6a enly fall forward. You can imply from th6wej:zr:0 qpaj z e-1qis that the bus's

  You are standing in a moving bus, facing forward, and you sx0oh /xsoqs+l 4(o-7tgxx;xf uddenly fall forward as the s fx0;h7so x -lx4q+o(/gxtoxbus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the mot/;an 0z e;npgiion of the object.

  The acceleration of an object is inversely proportorlvo x21o+:jional to

  A net force F accelerates a mass m wit*xxfi* /azh5/ aghrv5 f c.b:th an acceleration a. If the same net force is apaxx i hf.tbf/g55 *v/zh:c*ra plied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an ac/*i c k7zgcg0gdcc:0c celeration a. What acceleration results if a net force 2Fg c ic0gdg:/c7cc k0*z acts on mass 4m?

  If you blow up a balloon, and then release it, y.ts)h. l5rw6/ ot / a0khtqyd*ltc y)the balloon will fly away. This is an il*.t. /qayh or yk6 /ttd)5sc0ywl lt)hlustration of

  Two cars collide head-on. At every moment during the collisiowxf55-zvh ale22 cufnl5)-uwn, the magnitude of the force the firz5lwn au )h c2w2effu5--5xvlst 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 wv/kh -tad m;j.u q-*jan object, the force which the object exerts on you will-jh*/w; j q-dakmt. uv

  Action-reaction forc ;1vj.c04q jfavx;r*xkw l 1s49gfbqr es

  Action-reaction forcesm8j+ ieg6v.ej(rv; uz are

  A 20-ton truck collides with a:c 5 kxqqfms1 g5r;v,w 1500-lb car and causes a lot of damage to the car. Since a lot of damawm1 q q:,5cgvx;f5r ksge is done on the car

  An object of mass m sits o0 lo,jndlw(a3 ) x)nwwn a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the rd(o),30x a) wnwnwll jeaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earu3d xdb+t r2ygvw3gp;y,yh6 6th pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction+rdv6p 3 ;gg2t3byudy6wx, yh force"?

  Your bat hits the ball pitched to you with a 1500-N.v0e2d(n. bnps bt em8 instantaneous force. The ball hits the bat with an instbdvn2s0n.bt m. ee p8(antaneous force, whose magnitude is

State Newton's three 2i* y/ v*izmbylaws.

  Mass and weight

  The acceleration due to gravl(elhm 5h /e*1zo5fkh3jf n*yity is lower on the Moon than on Earth. Which of the following is true about th/*hk 55(fhz*hy e1meol fln3je mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at j4:jv) o.cmvme n db1y4b0e4 qa distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person vth 6u+k3by7:5n 3qlsuoad m*o g::gqweighing tuvnooumglq3 gy6d*ak+h:5b :3 :q7s 600 N?

  A stone is thrown straig, cr u0z4bfuq4ht up. At the top of its path, the net force acting on it i44z ur c0uqbf,s

  A 20-N weight and a 5.0-N weight are dropped simultaneouslm 7u n1whpi1f0y from the same height. Ignore air resistance. Compare their acce1wihf7np m0 1ulerations.

  A brick and a feather fall to the earth at their /w)7+nxv fozniz6g+x respective terminal velocities. Which object experiences the greater force of air frictionwz7/v6+ gfx zxn+io)n?

  An object of mass m is hanging by a string from the ceiling of an elevype.s88n. mzphw ( dh*ator. The elevator is moving up at constant speed. W8hn8 yw.s( pe.h*pzmd hat is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevatofgo6q m;n wv r2kgb0q5z *kl6*r. The elevator is moving upward, but slowil*q5zfgq*2n ko wkmr;66b0vgng down. What is the tension in the string?

  The force that keeps you from sliding on orva5gj9j0+wkbv v6 b-, px)b an icy sidewalk is

  It's more difficult to star)*bnvfbfd9/ +2 p1wb p(i (joks5cxw wt moving a heavy carton from rest than it is to keep pushi wfbj kiovx wcbb ps5p)+ nwf(2/91d(*ng it with constant velocity, because

  A horizontal force accelerates a box from rest acrossx6dm52nao l ,s 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. What happens to the box'6,d5amnsl 2o xs acceleration?

  A packing crate slides down an inclined ramp at constant velocity. fpum8 h:( zf*c Thus we can dez(*:hpf 8 mfucduce that

  A block of mass M slides+ix cn3 :hrew, down a frictionless plane inclined at an angle q with thixe3 +nr,:c whe horizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a , qqfgfl;df-3frictionless plane inclined at an angle q with the dg3 ;ff,-fl qqhorizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q with tke :3dy5 c*ovshe horizontal. The gravitational force is c:o*ek 5 ys3dvdirected

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclind4owq ; 6pvhdaxop79()a2j 2cqof,e ned plane that makes an angle of 30e with the horizontal. Make a statement which best describesop42dd7 x hnjq6,e92qco;(w paova f) their acceleration after being released.

  An object sits on a frictionless surface. A 16-N fojev*. qhexu: 3dmx:p3rce is applied to the object, anxm3*q hj 3:uex:.edvpd 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 to 27 m/svkpyg ke .ryz47 .v*lwn6s8b-q:en/ c in 7.0 s. What is the average forward fore s* yvvk- e.crq./ylzwgp:kn7 86n4 bce on the car?

  Starting from rest, a 4.0-kg body rllz4 o ftmj:pq/; 6c9zeaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?z:l4 q tc9mpo;fjl 6/z

  An antitank weapon fires a 3.00-kg rocket which acquired0* or8z.znd kdx1i+ ms a speed of 50.0 m/s after tra8r.d*z d1x +zdkm0oniveling
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: d04cz/:pz-d gylzjdna:+m g mass from rezca0- g:pdj n4/ :mdg:lyz +dzst,

  What is the mass of a p4mtz 8tcw+ bx*kwajc; *mv3t+erson who weighs 110 lb?

  What is the mass of an object that weighs t4t8v cf l)+ rny a.udrn tt9(qp4hc*0250 N on the surface of the Earth where the r.)t qc 94lr*dp08ta+nunhtcfyt(v 4 acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the maf /y4wkubj 89ybh5i 7s5 wemv-ss of the object on the surface of the Moon where the acceleration due t yy7vm5siw j8-h/b 9wub5f4keo gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B wei6ipqob b,q6sr1skw z7 wn..y;stt9 33kkc. ysghs 40 N on the Moon. The Moon's gravio.3i, nkr s t6..qkb 1qsz3wycy97w sb;6stpkty is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are havi3mb feu 7u4cz4q,w5tp , esuk1ng a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with at,zpf e7s e5ub4wkc3 u,1qu m4 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 12c kg4qtyao:g4gx p8frictionless surface. A force F acts on the stack, an4ok4cayg2:8g g t p1qxd 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 stands on a scale in an elevator. What weip8x q ocba5,itiff ;+ak5b:.fm p1 .ill the scale be reading when thea+ 51:mfii.8.fb e xckfp ;a tpo,bqi5 elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an )j -0w6k rb8uggv ypi,elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an accelera0pu8w g ryiv-bk,g)j6tion 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 kpcu( :237tjzbgwri *of the person is 60.0 kg and the elevator accelerates upward with an accelerat:r7 ( z*pjuw k3tib2cgion 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 magnitude5 .+gss kyq4mtxuj,g. 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 mass?.g kxtq s5+ugmjy,.s 4

  An object of mass 6000 kg rests on the flatbed of a truck. It is herga+gdt)8a l, ld in place by metal brackets that can exert a maximum horizont+rtgda)l, ga 8al 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 truqhk2+: - z9l4hfz nv8s+lmtw rck. It is held in place by metal brackets that can exert a maximum hf8 z:9lvzhlk+trhqs +-w2m n4orizontal 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, i( izk b2d)sd6h0 ja/2haa m1ztf M = 0.60 kg and m = 0.40 kg, what is the mi/d2d h)(0 2h6bsjzk1 aaat zmagnitude 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 kgd*0qs7ffy he /gcwa r+,1krf., what is the te+ca gfhwe rsdyfq0/r*k,f7. 1nsion in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a sn4x1s3 to9gyem d9vvux453na mooth horizontal floor with a force of 100 N in a direc 9 vyngsxua 41d4ex33von9m5ttion 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 smopb)uh)8 eiio yk gl3h+:ymo, 4oth horizontal floor with a force of 100 N in a direction of 37.0e aeiomo, u3)l+g ph i:by8h k)4ybove 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 6 egkut i clx:-ts+e*3is supported by two ropes as shown in Fig. 4-2. What are the tens i:+6k3 eucgs*etl-txions in the ropes?

  In Fig. 4-2, if the tensions in e;xo)trs;6tl p g .3lmthe ropes are 50 N, what is the mass of the traffic l6xmgsr .l 3;)eplo tt;ight?

  Two boxes of masses m and 2m are inwkcconczy4n 762vtxn) -h 73 r contact with each other on a frictionless surface. (Sn7o)nv3wcch7cz 4n6 -tx 2kryee Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other6m79/qrwkvm,cna (rs 26suw :jfm 8 cc on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massi nm68sw2,uq s:kvj a6fw/9 rcmc rc7m(ve box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the m/,acz): i zlvforward force on the more massive box is F, whatima)czv: lz/, is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. vzkx9qx4 0r9gp evu) 4(See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massivevkx09pe9z gu4)vx qr4 box?

Two boxes are connect,;fupjbsf; 7 br)mmq;ed by a cord running over a pulley as shown in Fig. 4-5. Box I of 7 mfsr;fqm,)u ;bpbj;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 frictiond98coi +xzu; k*k1uoxs between a 3.0-kg box and a desk are 0.40 and 0.30, r o1+d ki*ux 8xzckou9;espectively. 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 plastic on.ugu :9,4ze;5y;8yxuan w 8 j jryi.fdfby l0e wood are 0.50 and 0.ru985z:uyfd buj.wenf 04yeigjxa y,y 8; l;.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 in4r3zwckf ,+6dwt40 l nvup v+jyd89kw the +x direction. It slows and comes to a stop with a couv68d+f 3t p0wnr w4ycdjvwl+4 ,z9kknstant 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 5.06 96kk4h hd/;f;4fvrc vzoe vq-N force. A 3.0-N friction force retards the motion. What is the acceleration of the/rhv6fq dvvhe9k ckf46o;4;z object?

  A horizontal force of 5.0 N avry /3efg 2hpdwpx3 k; l-c7+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, v(c -r- awf+m4w:hv kys 9qhumvf5 i5(a puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficiff cv+- wh(5uv9iv-yakmr5s(hq m4w :ent of kinetic friction between the puck and the ice?

  During the investigation of a traffic acciqyz0p+s*eq,n.( y(dnro7pr e z di6/mdent, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway0e6si .yedp((,qrdp oz7nyr* q/z+m n 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.) Twm)okgf8fv5 q/- 7fih) 8hq cjhe 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 not slide on the more massive box, what is the static friction force on the less massim i cvg jfoh8k q)7f8h)/5f-wqve box?

  Two boxes of masses m and 3m are stacked. (S2( mqcc8uqdy *zg(i8wxxu3 - 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 not slide on the more massive box, what is the coefficient of stati-cgxz((m2du ix*q qs c3w88yuc friction between the boxes?

  An object is on a fri (7 yphf/v1ks) :ia7ytwf 6uqgctionless inclined plane. The plane is inclined at an angle o) y y /utk61asghpw vf7(7qi:ff $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mdx+zvd)z 6cw.n6n h y*u1pi a5akes 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 inclcmqz .a3;gr/h ined 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 smoouj ;-rnpg j e1b*u)ow3th 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, at a codp, j n;4, goxyj+bv9whc a-o1nstant velocity of 6.0 m/g1hx-bodn,9oy+p;jw ,j cv4a 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 slides down a/vz+5bcy bs*tce,ux 3 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 rniy0zylm.ihd c+i 3 (u35fuya hc .,m2ough $37^{\circ}$ 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 njy/pr (rn6(x gv qi,z7zm.4dcable attached to the l,rjyz4 .(mq(nvi6 z dr7n/xgpog 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 rough inclined plvqbpm nvtn2smn+q**co 5 056yane tilted at an angle on0*s 6bt+5qcy5vmn*mvpqon 2f $33.5^{\circ}$ 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 graduaj,40,kuf5 dzqsc)qhf lly increased until the object begins to slide.0 4 ,kjh,5cs du)fqfqz The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?