Which of Newton's laws best explains why 0wodxr36ui1l3k c 3*seite -hmotorists should buckle-up?

  When you sit on a chair, the resultant force on: 8ot.utn skay1 o xoxa/.,:mn you is

  In the absence of an external h dh 646gs6bii csoh5)force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turneuqq*k, 2 uy6eud off, while traveling in empty spaceku,qyeq2 6uu* , the starship will

  A rocket moves through empty space in a straight line w/ v+dhjrnq,u+n to :w8ith constant speed. It is far from the gravitational effect of any star or plan8u+n/ nvq+dwjo: th,r et. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a mov3bwgf.jd8 n:xing bus, facing forward, and you suddenly fall forward. You can imply from td.n:bj8w3gf x his that the bus's

  You are standing in a moving bus, facing forward, and you suddemtp4c 51 k dof(an5+nnnly fall forward as4a 1dp (c5nm+ fnnotk5 the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an objni:c4*wo fi 7q,6 twz.n +frbwect. Describe the motion of the object.

  The acceleration of an object is inversely proport *xv 6w1t/ezotional to

  A net force F acceleratevq3s6m8hy-vt p j48fr ;yp bi2s a mass m with an acceleration a. If the same net force is applied to mass 2m, then the acceleration will besb pqipft-j 6vm;48v8hy yr2 3

  A net force F acts on a mass m and produces an acceleration a. Wfr8 m; ylj;e:6kqh r7rhat acceleration results if a net force 2F acts on 6; l mr:8;y7rhqkrjefmass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Tq qu:d3ml jt9;his is an illusttqmd jl9 3;u:qration of

  Two cars collide head-on (dpg .(sblzwli3 gz2:. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactlz(ig 2pb3z d l.:lsgw(y 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 th3p 3ht5omdna;e object exerts on you wil3 ap5omntd 3h;l

  Action-reaction forcesi. -e x0 05n4pwwt8d.dbxgnf u

  Action-reaction forces arwm1l6s6 pgtod7d3 az1e

  A 20-ton truck collides withj7dt0fv-nbdb lk3z/r7, y r0.i 1mryv a 1500-lb car and causes a lot of damage to the car. Since a / 1, fnvryj m0t.z7b3-bld7kvr0ridy lot of damage is done on the car

  An object of mass m st8lg:d u:k8( ,tytp ,7qce lkxqyk-)y its on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction)dy:p ctguy,k- kktq:qt7 8 l8(eyxl, force?

  A child's toy is suspended from the ceiling by means of a string. The Earqlirb6l jv wi/969mc) k66 9fbrb pj(ath pulls downward on the t fll6) 6rjqrkbc99 6 pm(/i6bavb9 jiwoy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pi,1f8lkpi.d yw tched to you with a 1500-N instantaneous force. The ball hits the bat with8wp .di1y ,klf an instantaneous force, whose magnitude is

State Newton's three4cn0 9,55re *wzd lkrxpye l2f laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Eze-3; mmyis-/( uod hnarth. Which of the following is true about the mass and weight of an astronaut on the Moon' z eu--(n/yis;o3mdmh s surface, compared to Earth?

  An example of a force which acts at a distawhd5i hj::cq2 pu5xa/nce is

  Who has a greater weight to mass ratio,7uig-l 2unf/ v a person weighing 400 N or a person weighinn f7l-u/giu 2vg 600 N?

  A stone is thrown straight up. At the top of its pathub30 ,7kv- q(5lhap mc3xsx.;fqvw4hxp0 fvi, the net force acting on it isk3 x3( u.,q0f0 hs bacvp;wv5pqh4i-lmxv7x f

  A 20-N weight and a 5.0-N weight are droiv /2d cc ,jvipv;x;-ipped simultaneously from the same height. Ignore air resistance. Compare their accelx;vv cjc,ii; ip -2v/derations.

  A brick and a feather fall to the earth at their respective terminal vek zx,1 : ug wuomsmbu)-ce)ty-2pt+.nlocities. Which object )u. -)opmsmgntwxe+k :u12,-z ctu b yexperiences the greater force of air friction?

  An object of mass m is hann yr:rhf: c6mzo4o9x2 ging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tensio6hnroc 9:x2mf z:4ryo n in the string?

  An object of mass m is hanging by a string from the ceiling of an eqbke cja ) 3.(ozoavke ows)04 7:eox3levator. The elevator is moaq)o3z7aow )okjx.k 0es :e4bce3v(o ving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewal9upc0xh 4nd3poitivt 18v t 82k is

  It's more difficult to start moving a heavy carton from rest than iss+ci 4lbo6u+ q tt0e/+1 ja izt4sea/t is to keep pushing it with constant velocity,1j /ao +0si+cs+t/e lq4a t t6zebu4is because

  A horizontal force accelerates a box from rest across a horizontal surfcmjh mxs1u e4jw 545ps *c5esf; s45kbace (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal5xfemsses c jc*hk5 m5p b5u 1;s4jw44 force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocit 0 -j4m)r rr/fxgw1w,+ ipun.fydr0i cy. Thus we can deduce t/ 0yj-01iruic mf, +4 gfdr.x)rp nwrwhat

  A block of mass M slides down a frictionless plane inclined at 44ix,mx;lm+yu)na*dzwbt i9 j.+ dyv an angle q with the horizontal. The normal reaction force exertw d a;in*4 l+ yxtmb +uzm)i,.dxjv94yed by the plane on the block is

  A block of mass M slides down a frictionless plane/wig tms6 q gh9gus)11gw)fa5 inclined at an angle q with the horizg1q1 wgg /u)5hw6ag9m)ti fssontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down aly0:qs x9s/7gacv xp: frictionless plane inclined at an angle q with the horcl:s vx79 0:a/xsqgpyizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are relea; s,euae ( muu23av1 jgp(tq*gsed simultaneously on an inclined plane that makes an angle of 30eaquts 3pg, 12(j*uu eamev(;g with 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 apv z 9y 8v))l5ja(;wqy3 qgqu0u-oa w.vipu+txplied to the object, and it accelerates -(5 zg)vw+ y).quow aqi8u0uvv 3q;y 9xalptjat $2.0 \; m/s^2$. 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 s. z4opgc g54t1 )cl8wae What is the average clzeg pt)54a1 84wgo cforward force on the car?

  Starting from rest, a 4.0-kg body reaches a spee1 v hvb1+ilj3td of 8.0 m/s in 2.0 s. What is the nett13 hbv+iv l1j force acting on the body?

  An antitank weapon fires a 3.0k) qr a0h0* hsgpe, 7acrf.s,n0-kg rocket which acquires a speed of 50.0 m/s after qag),kfnp0* 0reahs. rh7s, ctraveling
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 pushyp. 3h3 6+wna,asfnu e a 10-kg mass from reywhen6s +f,33 paaun.st,

  What is the mass of a person who : ) oj-jn-rvfgweighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth whers59lggz r. d1z83f;) yaidxc ne the acceleration due to 5l)31d.nf9sgyzcdi ;z rg 8a xgravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earyi:j8:ctc z0 oth. What is the mass of the object on the surface of the Moon where the acceleratii0oz8:tc: jycon due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N yf1ezlb rrcxl f69/2a6d+qo*on Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of th6fox f y 2l/9e*rz1+d 6lbrqcae objects.

  Sue and Sean are having a tug-of-war by pullin)k -q1kzx19h fxq17y ck r2b9w ze:hzpg on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelq-rwq: zzkh1xy)1k9k b791e x hcp fz2erates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts on th ha)u1 99:i9g2v oehm 9leybxge stack, and it acc)xm9bo l1eahv9 ug: eg 9yh92ielerates 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. ub624h4zr o j+xl *xcm What will the scale be reading when the elevator is acceleratinmhol4zj 6c42* x+xbrug downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person:cr a0:jnkdpm2qj9 ,p is 60.0 kg and the elevator accelerates dn,0m pj:c9 pa:jdrqk2ownward 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 person is 60cd5m i7avs r5 n oizpts7n36xw/ee752.0 kg and the elevator accelerates upwpzmx553c ner6i7osds ae25v ti/nw7 7ard 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 2 l+qzf1-gu; 3wzphxc+ nlfv)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 mazgpc+) hnw ;3qf u x+ll-2z1fvss?

  An object of mass 6000 kg rests on the flatbed of a truck. It 2q5auo ahwu 6unbq11+6t j5mais 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 distance if the load is not to sli1qtahw261+am quo6 j5a u5 ubnde forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It2pju.; y5pvi c 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 ic.vu5 pp;2j yis not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg6h ls 0 qyif3or0 ri4n/syls2/o w7ev2, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)l/6wr0f3s2isyi 0 r /y hsvnole4qo72

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 k30v3x(cnl obt5j3lkjcs3 b9g f ev+m7g, what is the tension in the string? (Ignore f7 n35jvc l f +3o30cl3exbmvgt9j (bskriction and the mass of the pulley.)

  A student pulls a box d q 2x)(j0: zxpdn/w.siutkqvv* 2tk.of books on a smooth horizontal floor with a force of 100 N in a dvnz vs0j t/ .qitkxp2)q :.d kuw(dx2*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( b3de7kfj)rv of books on a smooth horizontal floor with a force of 100 N in a direction 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 bok 73rv()dbjefx?

  A traffic light of weight 100 N is supported by two ropes as shown in Fh7sz3e eu-d h1+s 5yyxig. 4-2. Whatse -huyxh+s7y3d 1 e5z are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass 0um5 98nc qq9 , vqc3jamlql5rof the traffi5 l5,ncqj3 99vmucm q8qqrl0 ac light?

  Two boxes of masses m and 2m are in contact with each other on a frictionf68u y3v 0feclless surface. (See Fig. 4-3.) What is the acceler eu8cff60vy3 lation of the more massive box?

  Two boxes of masses m and 2m are in contacgif4qmb 4ui1; bg9 bc9t with each other on a frictionless surface. (See Fig iq9;c b1ubb4mg9f4ig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m an eyh9,xjdyw(0d 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, wha9(0xhewj ,ydy t is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by z +j1/repm6n 02acivd a rope. (See Fig. 4-4.) If the forward foanp6i jzv2e +10 crdm/rce on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by q9zn b*/gfa),qh/rjw osgq 53a cord running over a pulley as shown in Fig. 4-5. Box I rz* /qbsaw),qgoq h j53fg/9nof 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.csgd6.d p8vqk173jpd n 5egj)0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal 71vk35.jndp 6j8 g )qdc pedgsforce is applied to the box?

  The coefficients of static and701jqk(4tvt ied 8igi7u bo9jra1h;y kinetic frictions for plastic on wood are 0.50 and i;k(g ahdjtujrty17v80beiq i74o19 0.40,
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 a0(v zlh8,-6t rfwwg slmxz-5the +x direction. It slows and comes to a stop with a constant accw0 6wlgxfmv, z-z(5last 8-r heleration 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 ha1v tf bg-tikg(pgf6k0k;f 8z /qn(j* orizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the accelera kp1qfkn(/6* j tf0gtzgvf i b8ag;(-ktion of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rate of .vue27xi lxklz .newcf /.4k:a8fk*v $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initial speed6.r9 -l iy;wsa6ssr pi of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinep rws;i.6-s raily6s9tic friction between the puck and the ice?

  During the investigation79ax2 blos;,vff9tcx of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the cas97v;lb9xxcfo ,f2a t r'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 anvp0 4y:+l bbds ).tbond 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surfs0byp4 b.v:d+n l b)otace 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 massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surf esf8w2czf*2yj/wbx 0aj (+,h erx5naace 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 static y2n2w jxe,f8 0arjhe5+cw z*(/sbaf xfriction between the boxes?

  An object is on a frictionless inclined plane. The pla)w qkin f 6r7a2ioj2rvp 4u9.pne is inclined at an angle oiofa6jprnv4. qik)pu92 wr2 7f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flazq3l:c7c i1: 7ot ruf-.juqutt hill 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 plap1p8ok*oom r)ne 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 ethwe(sdrolp*) me6l+ h.)j- w6z(lg 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 inclin;11j0 c; +ihccdezhwq ed plane, at a constant velocity of 6.0 d10;q c+;zcie hjh1wcm/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 dowccdsx)bk*t2z a5.kad(..gbj f+p bm:n 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 slidm3 h dfa9ycnwfz4,-0 qes 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 surface. The cable attache/p)l z 6d7xxt8rr 15i u,xiksgdzirt5s,xdxu7k 6 8/glp rx1)i to 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 rough inclin jzy;oha8x )yi ngr42 7c)rw8xed plane tilted at an angle of)88oygi cxhan7 rjz)xw2ry ;4 $33.5^{\circ}$ 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 inc4g ntyiqd ng3sl6) :m0+* wrcflined plane. The 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 static friction between the objy6gs4im*wr lndf: 0q)n 3g+ ctect and the plane?