Which of Newton's laws best explly2qiwc(6in p1g*q1 w ains why motorists should buckle-up?

  When you sit on a chair, the resulta,2 f t y4tda;qrtsn/0unt force on you is

  In the absence of an external force, a moving objecd8 o0-bj: r ab mui:7s0m fcgikic7/3et will

  When the rocket engines on the starndc3lm0 e 6as, lh;:bhship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the:3mnc hel 06hb,a; dsl starship will

  A rocket moves through empty space in a straight line with constant speed. .h mlq:bf /hcms*n+ -y It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied tsq- hyhmfmln +/.b :c*o the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suw:0vq7 rn2t2,3 7lo/xb 9uj elh lemorddenly fall forward. You can imply from this that the bus' 7utmrr/2qe27 : lnh e,bolw3x ovj09ls

  You are standing in a moving bus, facing forward, and you suddenly fall fr e(- jlfn4e9lorward as the bus comes to an immediate stop. lelrej (n9-f 4What force caused you to fall forward?

  A constant net force 0qnde mlty;y5:bm4 l(acts on an object. Describe the motion of the object.

  The acceleration of an object is inversely propkw. z9v* z8a)xxmeb2)v zkyl2ortional to

  A net force F accelerates a mass m with an acceleration a. If the dc9 x4op9 n(qasame net force is applied to mass 2m, then the acceleratio n9(opx9a4q dcn will be

  A net force F acts on(wwcr *rshzev m4i8 5: a mass m and produces an acceleration a. What acceleration4(w8ir:hs r me5v z*wc results if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release gn6v9l kx m 7i0 k w)0glc3b3jw-s(iwfit, the balloon will fly away. This is an illustratiwwk(7b 3 gvckx0 ls6 0jn)igwi-9lf3m on of

  Two cars collide head-on. At every momentua jue ehm) 0y,fbqy;c3;z,6 i during the collision, the magnitude of tu qe;y6h,j ;zmy a,c 30)fiubehe 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 xp:i:e.hh a-u4f.xf cforce which the object exerts on you wil-h:4.e:x.cfx huafp i l

  Action-reaction forces5lm r9llsycll 8 3g);r

  Action-reaction forces ar6rj7l30tayr+ /0 m imxeah +fie

  A 20-ton truck collides with a 1500-lb car and causes a lot of damag20 -c.o jys* siz p:ia6h6zisd l.+itwe to the car. Since a lot of damage is done.i:z6+i wpyca d h i.0sl2s*iszj 6t-o on the car

  An object of mass m sits on a flat table.qxcdx.y4 g( )l The Earth pulls on this object with force mg, which we will call the action force. What is th)g(dy.cq4 xl xe reaction force?

  A child's toy is suspended from the ceiling by means of a strix hf2 -cag7qbo -;x5/ htygw21 c)r8l,hxmrnnng. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what isorxnh m 2cqf85nxhtg )7;l1/,yhx 2cb arw g-- the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. The lf ( 6ixot/ve1ball hits the bat with an instantaneous force, who1i tf/vl (xoe6se magnitude is

State Newton's threej nqr:6tl(,xa laws.

  Mass and weight

  The acceleration due to gravity is lojhqhr , /ym+.xwer on the Moon than on Earth. Which of the following is true ar,qhm+ hj ./xybout the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dista8 xq 9(tm ni34b0iv ybd*b3edxnce is

  Who has a greater weight to mass ratio, a person wevo 9q)- 7kgdlzv-cue3rt ss7 7ighing 400 N or a person weighing777euk-s 9qt)lzogdc3v-sv r 600 N?

  A stone is thrown straight up. sg . shb7eqfn:ee7l)- At the top of its path, the net force acting on it is- )7s n:le7gesf.eqbh

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same heightz1/u hsu-zvkqv z92 t6. Ignore u- 2zkvz 96u1qh /stvzair resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velozp m+-t5d zot,cities. Which object experiences t,mzo - tp5dt+zhe greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevatsb chx( 6,5lkbtk1tq, z/(r ntor. The elevator is moving up at constant speed. What is the tension i5 , zbltxsbh1 tk6((ckt ,/rnqn the string?

  An object of mass m is hanging by a string from the ceiling of z -ih4; +ulcx:is/qy zan elevator. The elevator is moving uyicsz-/ z;4h u+:xqlipward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding ontm jxvuut*n6 3 )5t.kz9e +fsl an icy sidewalk is

  It's more difficult to start moving a heavy carton froq ud : t97iro,lbjs+9rm rest than it is to keep pushing it with const79 rrui +s:9 d,qlbojtant velocity, because

  A horizontal force accelerates a box from rest acelm -0f7f a-q-dmy;hzw-y kp+ross 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 happeqd; - -ky --zmh7 0ffwyempal+ns to the box's acceleration?

  A packing crate slides down an inclined ramp qapla7os;/ n 2ua( v x/q6qkr,at constant velocity. Thus we can deduce /26a7p rxv,aql/;qsno(q uka that

  A block of mass M slides down a frictionless plane inclined at an anglzaqy8a2dm 5zb:9;uy t e q with the horizontal. The normal reaction forceyz5dyz 9 m2:8a u;batq exerted by the plane on the block is

  A block of mass M slides down alv+-v keix7 :gii-v. i frictionless plane inclined at an angle q with the horizontal. The normigi v ei-x7 l-kv:.+ival reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at anslwnf27.) e .-ny)c xxfdpl rvq q)k22 angle q with the hq)).n lf dpx2qervc-wk2)n 2lf.xys7orizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined y 1qs orq.;trt, c; (z9n5wuhrplane that makes an angle of 30e with the horizontal. Make a s q r9ntzo(h;yrscurw;,1tq 5.tatement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the dk;l0g2,kod 1 obo/gm object, and oko/2, d10b;klmgg od 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.o( y 2wnot4z6r4kt5j j0 s. What is the avr2wkzn6 4oyt5 ( 4jjtoerage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8gn*96q4uk/izi1nf /l;ezwj i .0 m/s in 2.0 s. What is the //14qk;6e zujnig9 li iz*wfnnet force acting on the body?

  An antitank weapon fires a 3.00-kg rocketyz25n 7px9m h .mbgoi6ni7hj98n po/ r which acquires a speed of 50.0 m/s after trpo 6r 9h7zpxynng2 b7in5m/9ho ij.8maveling
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 pusc2:oxmd0f4nb2uct/s gs +(rmh a 10-kg mass from restc r4022:nbum+o s gxdt/c(m fs,

  What is the mass of a person who jo 1xj/ saxq-;w) /kduweighs 110 lb?

  What is the mass of an object that ) t)spqysr. q4weighs 250 N on the surface of the Earth where the acceleration due to gr)s)rqp . tyqs4avity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. Wh3dvz2fkip 5 s4at is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth 5z3di4kfpsv2 ?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The h h4by-prqp5 +Moon's gravity is one+p-qhpr yh4b5 sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite end lc:fuednu+hy6-)l w5s of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force wncdl:u fh-)5+6elu yif the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a o.dh*7 x uz+yqlevel frictionless surface. A force F acts on the stack, and it accelerates u *hq.zxo y7d+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 6j m7ok(( 8od jjhg+duuq39nxa scale in an elevator. What will the scale be reading when the elevator is accelerating downwardd 3o6j(u8oh(qgx+j 7k jud mn9 at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the z1g*i a oyl/wb(vy)z6 mass of the person is 60.0 kg and the elevator y *oy(w6lg / bivzz1a)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 om6t7wzvc(k: /avl2q o f the person is 60.0 kg and the elevator accele 7c l62tvzkov(q: aw/mrates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces acvh ucei7rrwhl.n 4u ;:b(c+w* rnz t43t on a 5.0-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 6.4z r u7eth.i hn4:;l+b u*wc(vcnwr3r0 N. What is the acceleration of the mass?

  An object of mass 6000 kg restec8o;;-; 0og1isnc: ggscoq bs on the flatbed of a truck. It is held in place by metc 1:;ooocgscs q; - gn0g8i;beal 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 slide forward into the cab?

  An object of mass 6000 vb0.lov 2v m:vkg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truckm2vov:b0v . lv 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 = 0.60 kg and m =whf-byc5 8/n k 0.40 kg, what is the magnitude of the acceleration of the syste58b -cfy/kw nhm? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = rjkoz n 8k9lv,jdb 0;00.60 kg and m = 0.40 kg, what is the tension ivbl; kd0rzno0j 8 k,9jn the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor v;uia5 db(ek)q9b6fh :s(*fl(vkvgq with a force of 100 N in a direction of bebl*; u a:(v5gkd6(hkif9 q(s)qfv v$37^{\circ}$ 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 hoc a,a*:hxq m/erizontal 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 xaa* ,/:mcqhe box?

  A traffic light of weight 100 N is supported by two ropes aso3;i2k mgk a,q8gc1b l shown in Fig. 4-2. What are the tensions ;o k mlg,k1c2igq ab83in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the*efd-h :o,no:r b. bsr traf,ofrsd-nb.b oeh: r *:fic light?

  Two boxes of masses m and 2m are in contact with each other on a frictionless sumg89 kx)e3jq:.xqhvh/a mr 2jrface. (See Fig. 4-3.) What is the acceleration of the more massive bo .jmj rh 2xmkq g8:/3x9vh)aeqx?

  Two boxes of masses m and 2m are in contact with each other on a frip lm)x iwtru85 zoh-2i,y iv*dk 7hk.:ctionless surface. (See Fig. 4-3.) What is the net force on the more massive b27hlo ktv5 imwir*)du,y xi.zp:-h8 kox?

  Two boxes of masses m and 2m are connected bysv:k(i 6f d1kj a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tensio i:vfkd js(1k6n in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (Sdb*;co,+kv, a(nzx v, wq kpz3ee Fig. 4-4.) If the forward force on the mov k v(3d,a*w;xozpk+b cnq, z,re massive box is F, what is the acceleration of the less massive box?

Two boxes are connected z75hjq/o c6htjsg28gby a cord running over a pulley as shown in Fig. 4-5. Boxh657jhszg t/2q goc8 j 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 starmr9 u;,+ok+vin.f4uxpd d,qt1fpm 7tic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively.i1f np4+9d;m xk,.rd 7o+,vuumqrfpt 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 :)vbe a1xvw;yj;jyh n:no:qmgw -.d3on wood are 0.50 and 0.40.j-:wvn q ;)x:y; vhb:nw m1adj ey3og,
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 dgg k3(ck (- swa.4ql jrvqwyvc0(7po *irection. It slows and comes to a stop with a constant accr j7q(vka4ww( v3*c(o p0 l.csg-y gqkeleration 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 horizonxnuq 9hj (ae-1tal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is uajh9n-( 1q xethe acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.wb 5l7.w inc /l8vgwo50-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, 5 rz -jwn*c8/wgsjqlbp,el)4 a 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 an- /s8cqg pjnbj) lew ,4w*r5lzd the ice?

  During the investigaf.y7f7e ios 7,bk t3hltion of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the cakh7e, it 773.s foybflr'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 and dimm12m6dqiu3kx0c / 9ps 8rr 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surfm 6up2xrr93q 8m/0d1ic isdkmace 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 massive box?

  Two boxes of masses m an2xjl 4d:fm mcenf+rz(f7sfzu; y,// xd 3m are 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 coefficient of static friction between tmxyx7fu/z,+ 4/rnldzfs2fm;jefc (:he boxes?

  An object is on a frickp6)o2qk-wu+ t /jlvjc4 7cjvtionless inclined plane. The plane is inclined at an angle of 2 vplt)q-jo c+cv kk6jj7w4u/$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle6afyw; yf+ a9qcyn9h8 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 inpon6o dfs m ;/rt)vn:(clined 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 smooth inclined plane tilted at acxugp/-9*1r d .ecgvtn 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 in :y4qet+5o rdrclined plane, at a constant velocity of 6.0 4 5o:+ qretyrdm/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 m5tcw,+jf/6 q5dqrt d l slides 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 slides4,mp ob vkvv; vp7ja,5mwodf q)50,dp 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 lohkk+.9;g- mf 6shtdy2pb.v lmg weighing 500 N along a rough surface. The cable attached to thhhktlg.sy ;.f9-2 vbm k+6pm de 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 inclined b3a i1rd5+uwdc6h;bcplane tilted at an angle of 5 dc6b1h;raid3wbu c+$33.5^{\circ}$ 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. Thehnl9/698y6sl 5b w5 tdbk:iuvr4 kjgc angle of incline is gradually increased until the object begins to slide. The angle at which rli8c:u9yt 5 9dbjgvsk/b546klnwh6this occurs is q. What is the coefficient of static friction between the object and the plane?