Which of Newton's laws best explaiygufy+ qw+dj63 7i0 tsns why motorists should buckle-up?

  When you sit on a chair, the resulta4pgz-hn :,l2q5obvmii*b8 opnt force on you is

  In the absence of an externalnr6oj3q.*b s3 btjp++1r c*gzgkjv2a force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenlyc q1 2ej3.lup u*p(uck turned off, while traveling in empty space, the 2 lu q upcjp*(3ck.eu1starship will

  A rocket moves through empty space in a straight line with constant speedf6 s2z6wk4 fzgn5*s rn. 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 motgfz*z 4rfkssn 6 6n52wion is

  You are standing in a moving bus, fayhb cy ar09eo/)b3j, scing forward, and you suddenly fall forward. a b, c0)y9h yb3o/rejs You can imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fallr21pmobrqs g46u+y- l forward as the bus comes to an immediate stop. Whaog6muy + brsrq2lp14- t force caused you to fall forward?

  A constant net force acts on an object. tuoah0. e7( u2;fko ws Describe the motion of the object.

  The acceleration of an object is inversely proportizxum(ivd4u rpv s36f n/4pg 368gxw+ vonal to

  A net force F accelerates a mass m with an acceleration a. If the same yj17grrrfsiuz: v8: ,/fr uo3net force is applied to mass 2m, then the acce7fjru,8r r:/f1i 3o: svgzyruleration will be

  A net force F acts on a mass m and produces an acceleration a. Wh3-l9h + v,h(cqjbnfl cat acceleration resu c cjlhl+fv(b, q93-nhlts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the f qcjpy-3f+ -*j.j qisballoon will fly away. This is yc-fjq+*f3q j-s.jipan illustration of

  Two cars collide head-on. At e ( 5nf-elt:fk (xraf/mvery moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car rek5(tmf/fl(fn -a x: exerts on the first. This is an example of

  If you exert a force F olpa8 as 77m6sxiy; z-vn an object, the force which the object exerts on you wipsa8;xi6 ams -z7 vl7yll

  Action-reaction forcesuy4bs ix 38snx6q bq09

  Action-reaction force :l 7q9c4(vzgyscxg, sik);kfs are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to tht;h0 ctagax7 3e car. Since a lot of damaget; 0 gth7aa3cx is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this oba3jgl)04os ro/2npc fject with for ga3jf2sr)40c /nooplce mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the cq fo90e eye-g 3/jizk8eiling by means of a string. The Earth pulls downward on the toy with its wq e-o9feg3kiyj z8e0/eight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to xqxl foa1-fxnh//i c: +fn3tdo zn(;*you with a 1500-N instantaneous force. The ball hits the bat with an instantaneou+n/q f;th :1oli-nnaczxf */x3x (df os force, whose magnitude is

State Newton's three laws,lwfkp lwls q6 hi,)18.

  Mass and weight

  The acceleration due to gravity is lot+;awxc*y4+ m 2n 7 penjovql2wer on the Moon than on Earth. Which of the +7loqm2;tp xyv *a+ cnew2n4jfollowing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dista:6 fnn;b bze -jzzgq7.nce is

  Who has a greater weight to mass ratio, a person weighin uxif crqcd w/83y6e-6g 400 N or a person weighing 600 wi6q/3xc ued-c8fy6r N?

  A stone is thrown strai)ju b3x2 kj9p;uj9twbght up. At the top of its path, the net force acting on i wuj ju 3jx9b29bk);ptt is

  A 20-N weight and a 5.0-N weight are dropp1oqq3dfid4r ;*+v s iped simultaneously from the same height. Ignore air resistance. Compare their accelerfoipsi;dq1+d q*v 34r ations.

  A brick and a feather fall to the earth a f v70b.rif2wgt their respective terminal velocities. wfb7.i2rg0v f Which object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. Thdxum g(v,q(nz*fma7 wtzcih-6 7 l8x6 0qc+the elevator is moving up at constant speed. What z6d( v0agctmchxzh,n7 87-x+qm* ulf t6wqi(is the tension in the string?

  An object of mass m is hanging bd7x7k v.m*t cj foa18:2 ab2i cnyzbd13lj7moy a string from the ceiling of an elevator. The elevatm bl2 :7c7ab*jd2av1ykmt1c no.8fj7z 3i o xdor is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sideapahl2w s9 ;v8walk is

  It's more difficult to start moving a heavy carton from rest than it is to kee 6yb0)5vgqed eknl 58fp pus8qgyf6ke)bl0 d 5ve 5nhing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal swm 6ic,1 de-fuxd s7l7urface (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 tw- l f,167i xmdce7sduo the box's acceleration?

  A packing crate slides down an inclwo0gakynco4mbtn (:*. ( 2wa.glwh i)ined ramp at constant velocity. Thus we can o 0n( itwm:yggbh)l4wao*k wca .n.(2deduce that

  A block of mass M slides down a frictio1da-3 j-zkq:7hd glmz nless plane inclined at an angle q with the hori 1q7ldjazk--zh 3:dmgzontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless planzv:qwet-ru844h6jb p41j4g s obsh4 ne inclined at an angle q with the horizontal. The normal reaction force exerted by the plane onuo8 g4qhvj4zhpw44s 46-nebt1r bs:j the block is directed

  A block of mass M slid6ad 5ry8q frwgn(m3r7 5w8ncwes down a frictionless plane inclined at an angle q with the horizontal. The gravitational forc 75qg5r(8fc 8 nymw rwa3d6wnre is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneou2 *jg cye(4oqdsly on an inclined plane that makes an angle of 30e wit42gq cyj*( doeh the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applivk 8,u:i,peu+;xcr vzed to the object, au:z,vr, cxu8 +v kpe;ind 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/s in 7.0 ./mzl6kpfpdby*y5(9xm. 3f ojm9lxk s. What is thelp mk y3dk.b/59(jxpm*6.f9ol fmxy z average forward force on the car?

  Starting from rest, a 4.0-kgk 5jbuz cfw2cjv:7co .y7k 4-j body reaches a speed of 8.0 m/s in 2.0 s. What is the net fo:jwfzkck5 jb c.2co 7j4vuy7- rce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which i(t67 t2oft8uxlw 6 vq,9khseacquires a speed of 50.0 m/s after tra2eof6tlt(xt8 wvq,uih7 k96 s veling
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 mq,h2 9gzvxt 3q 1+xvxzass from rest,q 2xvv3tz+ xh,x9gq1 z

  What is the mass of a person who weighs 15srcxaqifa3rg9-oz * )nz 0kr /z2 xn310 lb?

  What is the mass of an object that weighs 250 N op. vt*r*rr8 fzn the surface of the Earth where the acceleration due torprt. *8z rf*v gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is nk(dlg, -/ksi the mass of the object on the / ( idlkgsn-k,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,urzc+/cs+ 5gg2 6kifw and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of thgwck+fcrs 6 2gz5+/i ue objects.

  Sue and Sean are having a tug-of-war by pc u xk6jg;;/ o/3ldsaaulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is S/a;u;dks/gj3 a6co xlean'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 act v ks mut1k8r:k*2 a-u (,(gmemengl;)clrso,s on the stack, and it accelerater(*- lksg 2s, ket8a ): m1;lnum(c,r ukmvgoes 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 *0kd3ll73tqq yc3+ ; tglvx vm.i eg1yelevator. What will the scale be re3 qtelgd+3;qg vv 10yxcl7m i3t*l y.kading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If5mtgkj0iz q4s/6lg0 o:u.abl the mass of the person is 60.0 kg and the elevator accelerates kgs/60t0u4q jlmo blagi :.z5downward 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 thy10u5+ (mpgyio aft) we person is 60.0 kg and the elevator accelerates upwart5f(1 u0yw+) po agimyd 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 mass. One force has a magnituv,0:hivn5 pabc xyj.5z v:ii/de of 8.0 N and iinv/ c va0 phxb:,5i y5zi.jv:s 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 flatbed of a truc) *id(e jzbgvrg+uo:v*- p4 czk. 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 stopb4 *ouiz*) vrjzdcpv(gg e+- :ping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed ulu0c/ v;2b qmxa) j(dof a truck. It is held in place by metal brackets that can exert a maximum horizonqvbmu;/xdlca2j) u (0tal 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. 1wxbh7 emx euxl5 lzdj0./k,)4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration7. / u0 x5hw eebdx,mllzxk1j) of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60gdib*.pcmtu3w xl4 6( kg and m = 0.40 kg, what is the tm4*.6cwlgu txp(i3d bension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth hoa qmzhm2s3 rq7:hek: /rizontal floor with a force of 100 N imrq :h eh/73a:qkz m2sn 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 ai cqimx5nn*b-1o 5 ;o100 N in a direction of 37.0e abbo;co5*m-5 xn inq a1iove 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 rhtg pwfq ,73gyo)9e s)opes as shown in Fig. 4-2. What are the tens)p9 wg 7oy3 ehgqsf,)tions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, we37w6fahl(a d2owxlb /d3sa1 hat is the mass of the traffic lighawl1 oea67ddx3lw(f /2hb3a st?

  Two boxes of masses m and 2m are in contact with each other on a fris3lyo5gtn69i1cul vpxh9.7 f wkr l77e- k:nqctionless surfexr 79cv:7 llhwpilq73nng.y kk56fs9 u- to1ace. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each othe/c0 b3dw+ mur ;cyn/oar on a frictionless surface. (See Fig. 4-3.) What is the net force on the more mdbm/cnyr a0w3; ou c+/assive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig.0)9g.pno yqdc 4-4.) If the forward foroq90d.ypc) ng ce 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.) If the z4nk xljf 5s7n wt+-l/forward force on the more massive box is F, what is the acceleration of the less massive -xt klj45fls /n7wn +zbox?

Two boxes are connected by a cord running over a pu* mamoe;d)/ fwe7imf+lley as shown in Fig. 4-5. Box I owf+oae)/mm* emi d f7;f 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, pg 9rc*lu/tg between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the*c,pl/ rgu9t g box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are rc)z/op4 q a7z0.50 and 0qo7 )p r/4azcz.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 i22vo wdiji( /on the +x direction. It slows and comes to a stop with a constant accelerationj2 wdvi/ o(i2o of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting o49bi.fd8 xc yun a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the a 4udi.yb cf89xcceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at u0 je/8 nz:i:a u8lorsa 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 g4cp yraa6o7)v iven an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What 4aryav7)c po 6is the coefficient of kinetic friction between the puck and the ice?

  During the investigationj:0hct)/yx r j of a traffic accident, police find skid marks 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. Estimate the speed of the car when h/ c x)ty0:rjjthe brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface b,:p zksg0r 5cketween 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 thes, :0kgrzk p5c 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 betweenc9zm6, 8+-fx*jbdqgn qg3+up wcr0k v the more massive box and the horizontal surface is smooth and the surface between the boq0gw8v *c6q+zkxn pcm +jr, f93bgud-xes is rough. If the less 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. mbb3xrzlz3+bgvmf+k 3o5 ;s+ The plane is inclined at an angle o;z5 s+zk3gbx3 ++bmm rbvlo3ff $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makr;2ete) ird)0 ib 2p2tirdt8ves 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 angle of y 0 1o4xt.r5exgj6 ihqk+h su;$37^{\circ}$ 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 tiltsr zx 1wj/mttuw)cmx+ +/zi0+ed 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 constantip4nd70oh* ;o rmrbs/ velocity of 6.0s nb*r;m7h/ oior4pd0 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 slides down /;wew bli8p mg 2a w.w uaj3bcw5f3a),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 sm;l )vx*a0 1fg*v h4)ahe3.zre l hq,jolk h)mlides 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 wei ;r3gtpf8uof o42ku 9lghing 500 N along a rough surface. The cable attached to the lu;ptguo4k2f3r 9l 8 ofog 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 p mk mavh bfw00*8f/opwn.w2i 2fp;1z slane tilted at an angle pn.sz218p v0im2owffh0 wkbfwm/*a; 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 l xjsucusw7o /bbf-)0sx )1j* angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of stat0-wcs )sfxubu17jb x*jo l/s) ic friction between the object and the plane?