Which of Newton's laws best explains wt1- 0q b-wib2m ldqizo8e /i0jhy motorists should buckle-up?

  When you sit on a chairxrmz,-sxm8 4fp cav31 , the resultant force on you is

  In the absence of an externazanh )h,4-aav l force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are s s+y06vk g rz12vot9syuddenly turned off, whilzy vk 0t9osgs+ v126yre traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant speedgx l8s 38w6b:4yjuw nx. 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 syw u4wjn8 gx:3s8lbx6ustain its motion is

  You are standing in a moving bus, facing forward, and you ss1kpw* 7q k 54 ugbph.kvm(9ayuddenly fall forward. You can imply from this that the g74*y ps pwa1(q.5vmhuk9kbk bus's

  You are standing in a moving bus, facing forw*w hd+ 1swc7vjard, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you jc1 v dw7h+sw*to fall forward?

  A constant net force acts on an objec59.oi u 1zmpo3dav4jthf j 9d3t. Describe the motion of the object.

  The acceleration of an object is inversely proportional 8d0b38xf0 (w jdb dvulto

  A net force F accelerates a ma847xh p1 wyo,cjg rkf8ss m with an acceleration a. If the same net force is applied to mass 2m, grx,jw4 hf yo7pc8k81then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acmgf,sb98 w5u*nih, kq celeration s59 8u m,q,gwn*hifbkresults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. g da im77ik zz+4oa)7w+2yy nkThis is an illus)47aimyyg kzak n7 +ow z+d2i7tration of

  Two cars collide head-on. At every moment during the collision, the magnitudj 7.lso9;0e vbninj z9e of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on tzjnv7b 9e 0 .ljio9;snhe first. This is an example of

  If you exert a force F on an object, the forcewl492o3fk- vnz- n.vpepk/aw which the object exerts on you wi2fk ov4w.a-e- zw9k pn/3lvnp ll

  Action-reaction forc;y :dy clm4r3-0 recqaes

  Action-reaction forcysqo.87x il/a es are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damaygm 63+2 hrcwpxvbse5ow- )* ige to the car. Since a lot of damage is done on the c)o2em 6xs vg3 wp+iw-byrc5 *har

  An object of mass m sits on a flat table. The Eart1tjl9i4 :wl qq k9 gok4n:+qqfh pulls on this object with force mg, which we will call the action k :kq99fjlg 44 qqnw: q+1tiolforce. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Ear+,w m4a p43 ag,tprzyxth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is th+gmtpra4,xazy, w34pe "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instanho t-t(pv7 eeyjr6ru2 2mo2f- taneous force. The ball hits the bat with an instantaneous force, fo th7yo-t e2e j-6rvumr( p22whose magnitude is

State Newton's three laws*awo4z 42ykmh.

  Mass and weight

  The acceleration due to gravity is lowil1--vfnss .d er on the Moon than on Earth. Which of the following is true. -vssi1l ndf- about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts s* ai-z:zgokag.lrrt q *1-0eat a distance is

  Who has a greater weight to mass ratio, a person weighing 4s 3tjj 3k;7ogf00 N or a person weighing 600 N3j sfgtk7;j o3?

  A stone is thrown straight up. At tj1n+u d 8;ps )rp4 iin5ir7ydmhe top of its path, the net force acting on im+pj8) 1 ;ididrs5pi rnu y74nt is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the sh9f3w(gh:k1jx ylxi e2yvxfu ( 6v56name height iv2w1xn39 fhxfvyj:66 (h u5xkgey(l. Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocizbgc h1p2+:c.urlk9t s5q) mn/k,e beties. Which object experiences the greater forc,upc hkq5b ckezr1/9b l:eg.2)sm+t ne of air friction?

  An object of mass m is hanging by a string from the ceiling of an elee g7bt p kk(x82 xtxgv2of8bu *c:u).avator. The elevator is moving up at consu7) kpf t.e8a ux xtko*2b(xb2g vg:8ctant speed. What is the tension in the string?

  An object of mass m is hanging by a string fr,9k k pqz+d i47 hri/w;jil+gxc)tpp2om the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in thj p,lk4+ i;zp7ghq/ p) kiwr dc9t2xi+e string?

  The force that keeps you from sliding 3gm.qq0awjnpf 1*y ;won an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it k7 ka61 wjixtmwlc4m,euf.xws(:9 w-m u(ia6 is to keep pushing it with constant veloci7awkxkwu4, 6ci t 6mx- .9( :ajwumis (flmwe1ty, because

  A horizontal force accelerat/cp+ 4sae3ydees a box from rest across a horizontal surface (friction is presea/34e +dsecyp nt) 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's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. q8 a(k;ejk:ou ci-;ox Thus we can dc i(:;;xk-ea8o oqk ujeduce that

  A block of mass M slides down ap l 7xr3ci.bb2 frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by xbrcpib2l3.7the plane on the block is

  A block of mass M slides down a frictionless plane inclinw/znnd kl b4e;(g9,gfed at an angle q with the horizontal. The normal reaction force exerted by the plane on tg4b9n w(kzg/, enlf; dhe block is directed

  A block of mass M slides down a fkdptwh51+0,:moqtf hzrn ;1-j nz (efrictionless plane inclined at an angle q with the horizontal. Thkzpj0whnodr5+ ht:qmze;t ( 1,f nf- 1e gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneo0q* qorn9:r(tbkrh0od n*8.z ri 3b*nx nyku2usly on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes( *oqq2:* bbr 00 r k*n9xruzr8ind.3y nkhont their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the objec 6z5bsez55 hg xk enea7(m94gft, and it accelee5z6fmaxbeg 5gskz(4 h 95n7erates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can acyo,yk x m1cs75celerate from rest to 27 m/s in 7.0 s. What is the average forward force o,ycs157k ox myn the car?

  Starting from rest, a 4.0-kg body reaches ap.w)w,4d t aq 4rmkg)nmb ij5ki5g,3d speed of 8.0 m/s in 2.0 s. What is the net fobwg5)dtmnm3q4r j4)k k.g,5 aidp,iwrce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s aft+63 jqbuni +bfer tn+36bb quj+f iraveling
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 force67cau( :vybrr43i:-r zselb s that you push a 10-kg mass from rescy(7bb isrlvs4ru: -rzea63: t,

  What is the mass of a pe e 93 oug1ufh5wdtc xj3xu71w/rson who weighs 110 lb?

  What is the mass of an object that weighs 25z*+z q3nwzw:;ih) a nd0 N on the surface of the Earth where the accelwza n3znzw;q:h) +*ideration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass e uf-an 3kfc;sy.0hk6hh .hc:of the object on the surfa n.cf.k k36h0hua;es fh:hy-cce 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, and object B wei f5vc 2 zbqq)v5yxc;ej zo 58ryvbuzo6h;( x7+ghs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. 75v5h e86 +bo yz jzvx()c5zrqxu2ybvc;f;oqCompare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of y 0fxg -)zj8d-7 0pq;k pmduyfa 5.0-kg rope. Sue pulls with a 15-N force. Wpu0xf8f yz-m;7p ykqj- d)dg 0hat is Sean'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 ac jr7bm;05a nkrts on the stack, and it accelerates atnab rkr70j; 5m $3.0 \; m/s^2$. 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 wilk5hk) zc1 *ovtl the scale be reat k1*chokv5 )zding when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rm-:9g xg*w):jj 8-hbcmn5u ndzpxci2 ides in an elevator. If the mass of the person is 60.0 kg and the elevator acceleradui-5:jj-g8bc ):wg2xnm *m c9 zp nhxtes 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 elevaa n-1 7vro2kn ,.wctfjtor. If the mass of the person is 60.0 kg and the elevnof1k,c2wnr t.a j v-7ator accelerates upward 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 fz1tdjf z h5siq p,y,a3:um9 0 kw)oj1eorce 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 accelerajm 15hs,zwz :p0k9 t)ody u ejq1a3f,ition of the mass?

  An object of mass 6000 kg rests on thpjl3g 7 ibe9*be flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck i9p3bl g *bj7eis 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 helqm57nx aa 6cm.d in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the trux7.mcqaa m5n6 ck 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))bniph-k zz4 = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulln-pi 4zzh ))kbey.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m =e yvf0mlc 05(,khurc0 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pullh00cvylfu e,mr5kc0( ey.)

  A student pulls a box of books on a smoo ov rot60y--pzd-/m)+5ok rk7pto vt ht91mupth horizontal floor with a force of 100 N in a directiom/o9v17k) ookdu vtmtt-thr + 6 rp-oypp 50z-n 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 z0w2c;z rk pv7horizontal 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 fow;r2cp0z 7vzk rce on the box?

  A traffic light of weigx ))aobo*t2oayv5 n j.ht 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the 2)jon .) atvo*yoxb5aropes?

  In Fig. 4-2, if the tensions in the b6kxx:x(zo+mlf4 s;xropes are 50 N, what is the mass of the traffic light?sz6; x 4xxo(f:lk+bxm

  Two boxes of masses m and 2m are in contact with each other on a f:1z84 uljgdz srictionless su81ljz:d4su g zrface. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact wiq 5h:sf f gs61idqp2(yth each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more yp6fhs q sq f(:1gd52imassive box?

  Two boxes of masses gyh39 tw wrn*8ou1;yp*d)c q mm and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive 3 odywnt*)yghp9u8r1 c m;qw*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 then+1 v37zrnyzs forward force on the sz+ 3ynznr7v1more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. B)4yqzn v m 5a/j/uxj,* bbip*vox I of majvn,vz b5q)4b ai**/ p/ujmxyss
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 sta-qi rw 7nxvk.8b 73ipjtic and kinetic frictions between a 3.0-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 force i.bnp7kwx3vj-7q r8i is applied to the box?

  The coefficients of static and kinetic frictions for plastic ;oemp ftw:9f+ on wood are 0.50 and 0.40,t;f m+we9o:f p
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 surfacqya 3jv0-s (.:h9r qcw7i ndsue in the +x direction. It slows and comes to a stoprq.c n uv7yj3w:s 0q-s (ahdi9 with a constant 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.*8* tyokrq3tv0-N force. A 3.0-N friction force retards the motion. What isvktq3*o 8*ytr the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, atnei i (p8p);ds 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 speed of 10 m/s. It slideszrxd mm ;.( 2fmmpmk(5 50 m on the ice before it stops. What is the coefficient of kinetic fric2m.( (5k dmr mpmzxm;ftion between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.07 c4;/r1ky4.fz uxwhe 4iynv, fo gji- 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 sp kgunhiy4x, o74rfw;e -1.cf zjyv4i /eed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stw -kzg .b99n-sphb-ll 2kyyv+acked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surfacew vnp9lk-zks .b-2lhy +9y-bg 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 sem (:lg0vsqg62 d z:fftacked. (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 co(dg fevszq6mg:0f:l 2 efficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined at an anvzc d*/xv7)zx gle of c d)7xzv zv/*x$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hiyv+x96p0dms qh/kl(u ll 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 plane with an a 8:m1 8p8zcer frrv:q x3uqaa8ngle 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 incyvg 0q8tkb 7 xhspfnlw1*l3 4cz/7r8qlined 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 planhi*3axh/ug/sijs kuwe 3; 7n, e, at a constant velocity of 6.0 xk ei*un/h igs7 jh,wu3;sa3 /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 4gm9p p l )s:ork5iu6bc:/zff 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 sli:ud klj-sme +z ,k 5w(*kwlwz6des 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 ,/ fww:ixg,s:xe/i6.rpilm1 u cvc 3a*ck g1va rough surface. The cable attached me61 c3cvi1sguxkv// ii .xw:lf ,rpw ca *,:gto 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 inclined plane tiltevb5x oy5s- t*8pmmls +d at an anglesy5t b- *+lvm o5pm8sx 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 o64 9zsxgz w o466fmhkry g;.d. 3vvycfn an inclined 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 object andf6y4 omwd6gz. .3c4 fh 9rzsgvxky;v6 the plane?