Which of Newton's laws best explains why motoris9d7c;u5fb rdits should buckle-up?

  When you sit on a chaczp 2/a7u b6nqir, the resultant force on you is

  In the absence of an external force, a moving objectq9,v/9:/ i jk *d kqxqyanajh, will

  When the rocket engines on the starship NO-PAIN-NO-fa6k2n c4 c;,l 5drmrjGAIN are suddenly turned off, while traveling ind,6k ;ca ncrlfr5 24jm empty space, the starship will

  A rocket moves through emptyc) c7za.aiwz(c0b*awt hu * *z space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, t 0cz( a )z*zu .bw7cita**hawche force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, fac,n fy2m .gleb6o0n7hying forward, and you suddenly fall forward. Yoe6n. ynb 2lf7h,o0m gyu can imply from this that the bus's

  You are standing in a moving bus, facing forward, and you g*wv.hza(fu:l . lfe6suddenly fall forward as the b hzl f.fgueav.w *(6l:us comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an objec - z *o13dvc0qxa4rlxmt. Describe the motion of the object.

  The acceleration of an object is inversely proportionhz 2y,dskvs)aym2a;y6w 9r1yal to

  A net force F accelerates a mass m with an acceleration a. If5gcyr:( (c kvc,. wcql the same net force is ck cl5cyvcgr(w(,.:qapplied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an;hvivd8kj8n6:u q i.z acceleration a. What acceleration results if a net force 2F acts on masvkv;ujhi :.8qd8 n6z is 4m?

  If you blow up a balloon, and then release it, the balloon will flyf xc 57w; ;,ewhihw;hd away. This is an ill;h;h5cif7ww d;e,xw hustration of

  Two cars collide head-on. At every moment during the z; l.;vtgtpf vq-4xs-collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the seconz4vg vs;qt xf.;-lt- pd car exerts on the first. This is an example of

  If you exert a force F on an object, yn5u-g , sos.h7ve8- ,zs+wqko9biukthe force which the object exerts on you wil-yb9s 8zosn5 ,hwe v7skig+o uk u.-,ql

  Action-reaction forcesjal+ ,ayu ihui7+ tyiac;3n* h hxb.5)

  Action-reaction forcplw0:hapg;1vo8u*j hdr h zb2 l5 ei2(es are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damag58k u4oou :jd;/ay akpe to the car. Since a lot of damage is :u/5 8op;kjdyo ka4uadone on the car

  An object of mass m sits on a flat table. The Earth pai*xi9o c;n v+ulls on this object with force mg, o* i9ai+xnvc; which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceil tqqc+i4+m*a;w cie c.ing by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the 4 caeic m.+qi+*cqwt; "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you w4qazq. u.3nfw ith a 1500-N instantaneous force. The ball hz4 3qaun.f q.wits the bat with an instantaneous force, whose magnitude is

State Newton's three laws.ewr::.b 3yoj+6c koqi

  Mass and weight

  The acceleration due to gravity is lower on the Moon than qtecv9f,71 qson Earth. Which of the following is true about the mass and weight of qevstqf 9,71 can astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at at ay(;ui3evlz244cs x distance is

  Who has a greater weight to mass ratio, f4 f2sz(pb tw7ovh04 5 gmu5uda person weighing 400 N or a person weighing 600(ft5w2uf5u4vd7m0 bp4hz g os N?

  A stone is thrown straight up. At the top of its path, the net force actinc lrh; 9ua9kdxqgy1,169 uryr g on ryq9lg6a1urkr ; d1c , 9xhy9uit is

  A 20-N weight and a 5.0-N w -oiikrvhx8, -eight are dropped simultaneously from the same height. Ignore air resistance.h,o-vi irx8k - Compare their accelerations.

  A brick and a feather fall to the earth adxti5 b52w5w 7w) ponwt their respective terminal velocities.d5b n2t5ix ) ww5w7opw Which object experiences the greater force of air friction?

  An object of mass m is .gz 1/ ; j)u6my3qlxq dzyf:pyhanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is q .fmqy/u6 ;)lzy:dzp31jy gxthe tension in the string?

  An object of mass m is hanging by a stlp, ig ppxz ;928lprd9ring from the ceiling of an elevator. The elevator is moving upward, bulxp299p,d lpzgip r;8t slowing down. What is the tension in the string?

  The force that keeps you fr d),,ct;d:wv95 uxjxfthw)to om sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it iswrh .bcfq9 3)s to keep pushing .rc )3bsh w9fqit with constant velocity, because

  A horizontal force ackr6;y1 :n/bn,kcky 8pwpehcfda,35 tcelerates a box from rest across 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 hor t,kdn c,w 5phk1c8;enbkr p/3ay:y6fizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides do0 fij e-,dzo(ycmp7 1swn an inclined ramp at constant velocity. Thus we can deduce thatsyd1jo0cmi7 ,fp (ez-

  A block of mass M slides down a frictionw8; e3zajhf)xless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the pf we 8;jaz)3xhlane on the block is

  A block of mass M slides down :r;jvlwlg 73yl)n)j ptd 9.g ma frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the pjy));t9lj lg3pn: wm.d v7 lgrlane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q with jt/7xj2r m:sr78on vrthe hor:2 rnjxvrr87/om7tj s izontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined3( b*z v:hp(ozalh ne2 plane that makes an angle obvnlzz *(: e2hoh( p3af 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a f6)*k;krewcvoi no *q 4rictionless surface. A 16-N force is applied to the object, and it ar; 6)qevcok4wi* k no*ccelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 10001,zc3) jj(jehx-ht i a kg can accelerate from rest to 27 m/s in 7.0 s. What is the average t3 a,ei)-jj1hch x j(zforward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8m (r- ;bjnz1.l,yppqg k-lmw4 9nngb57fmq . m.0 m/s in 2.0 s. What is the nr91lpgf mwnn;glq4zy mp q7b b-m5 -nk..,(jmet force acting on the body?

  An antitank weapon fires 8gamg.of p jis1-r+9t a 3.00-kg rocket which acquires a speed of 50.0 m/s aft-fisotp1g ma +r j8.g9er 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 wit./5fheema6qz.mi c;nrg7-0kpl xxo6 h the same force that you push a 10-kg mass from resp7f0 kz56m;m-. r h/exgnleq6ixa o.ct,

  What is the mass of a person wsjd he*yxufds6h h0f-*ab .rcz73/u*ho weighs 110 lb?

  What is the mass of an object that weighs 25xp,zdqvk5 cnyd wdi7 +v5:i40 0 N on the surface of the Earth where the acceleratioxz 7 iywdi n40d q,+cv:dkv55pn due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the:))uld z2x8j htep(k m object on the surface of the Moon where thz 2d:pl(hmxtu)k)je 8e acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Moon'doqs5 az(+/u3(aqcqcblg t)1s gravity is one sixth of Earth's. Compza udt ( qq1bcl5qoa s+)/c(3gare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg m :ntix.1z2nu rope. Sue pulls with a 15-N force. What is Sean's force if :n n1xm2tu iz.the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level+xpvdf0rm 65eub 9fl8 frictionless surface. A force F acts on the stack, and f6v0u5pmx bld e8+r f9it 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. Whn1i6r 7 ivxun7vf;bl3sam6 yunr,; + gat will the scale be read7xi6bn1flr3+ngs ir u nmv7;y; 6,au ving when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass fei+)+ 2o4p :fofom 8g(ye wcpof the person is 60.0 kg a(o4e p my:8 we)++coofpg2ffind the elevator accelerates downward 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 60.0 kg-xfpy 0v x4(rvis1 8gh and the elevator accelerates upward with an acceleration of g 8-xyhrxv si(40v1pf $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5g 7.)(jga5 j+5o+elaum strnw .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 accelerationm5gl.sj g ()5eta +7nj ra+uow of the mass?

  An object of mass 6000 kg rests on the flatbed of a gnxp5 wi4tycocw; 2 20truck. It is held in place by metal brackets that can exert a maximum npocyw4 g0t ix2;5 cw2horizontal 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. It is held in place1 ycd+ z2aujr) 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 tim urczd+a j1)2ye if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kgbia:i+dr tsn* h/0gt/ and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Igno 0/:gt+ad rt bin*sih/re friction and the mass of the pulley.)

  In the Atwood machine shown in Fig7ow s9jm4* 9k sp:xrd5cqt 6in. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the stringd6m9q9 5pk woxrci7tns*:4 js? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force ouq8 j f7b/qao6f 100 N in a directi 6fq8/b7 qaujoon 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 wid8no1praqo h5 :ou,1vth a force of 100 N in a direction of 37.0e above the hoq1doo:nova158 r p,u hrizontal. 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 shown in Fig. 4-2. c 6zog8 yt+py+tpx4 b6 What are the tensions in the ropesp6by4xp6yz tgc++ o t8?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what;dqv b-28y libzku; x* is the mass of the traf-qzbbd;8k2ly u ;xv *ific light?

  Two boxes of masses m and 2m are in contact with each4fu; in.z-t-cnkbu + a other on a frictionless surface. (Seun ; bikf-uz4t-.+na ce Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact w zi*hla6qj dyz 04:3ewith each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the mord hq:iylw4z30zeja*6 e massive box?

  Two boxes of masses m and 2m are connected by a 9 +(5buqap 5cgfm,; beir7epa rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension95cp b7 ab(g5qmi efpu,ra;+e in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.*hb(m pcqd7;c ) If the forward force on the more massive*cch;mdb7p( q box is F, what is the acceleration of the less massive box?

Two boxes are connectqpht/;rt1m t:o yti1qz./ +a wed by a cord running over a pulley as shown in Fig. 4-5. Bq/t11mwztyaqtp :.ti;+/ hr oox I 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 between a 3.0-kg box and a de/12rc*zp( r2;ylx qhe rkdil0sk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to dp il l2/cz1kr20*rxye (r;h qthe box?

  The coefficients of static and kinetic frictions for plastic on wlyd2ad/b1/n xcuhhwi6 scyiy53**. v ood are 0.50 and 0.b*i62 s1/dy anch *5ui3v wcl y.h/ydx40,
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 + 67ou2tcklardh8q4w9 x direction. It slows and comes to a stop with a constant acceleration of -au9od6wrl8h k74t cq2$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface ic4g xjjwp f34 1wrva)jd-/ 0l*ny9ncjs pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the obn4g 9rj ldyc xjw1*cpn-fw0a )j4/ vj3ject?

  A horizontal force of 5.0 N accen .g11u xt7siklerates 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 an initial s,ba dvpkq*+s 6p41nlmpeed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and thesm6,4+bqp*ld kavn p1 ice?

  During the investigation of a traffic accident, police find skid marks 90.0 m lb trm8ew35yx . 8dtp0gong. They determine the coefficient of friction between the car's tires and thw 8.tge3y dmt8 5rxpb0e 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 areigaxgz l/s:72 knf. a4ya2i*k stacked. (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 statanyk2g2fk g.a47i :sxl /i*azic friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface8d/kk3.6rd e+lz um ej.9bw(ij fpc1y between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less mass uf8/lk31m.b(zy 9i d w+.ejcjde6krpive 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 0 x ; vjnlt ofa9uj6.qdao/2f*plane is inclined at an angle f;jxa/oljt6 df9 .*a0nu 2vqoof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mhe l fv*c601seakes 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 ang 0:b38oc vapj 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 invz ; t6l.9iylx er:5scclined 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 constant ve d inmt wmwj2zc;ne *)yva:66f72idz+locity of f dnc)w2tz2+deiym i*6 z jv:m76n;aw6.0 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 slit j/9vsb( six 4t4p2ysdes 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 apdzjrp rmnb5 5i;ct cjhv-tz/1l 45 (: 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 atthe 2*fj6 mdsqt.l5fs 8ached to t *.tldheqj86 msfsf 52he 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 on3 : q(he(yk7j zyy6:hru.czqo a rough inclined plane tilted at an anglec:q :kj q637 oh.eyyhyzr(u (z 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 angle+.s z*x68ef*um- rpia)tozpq 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 objeco +*ra mtq6zp.f8*zuspxi- e)t and the plane?