Which of Newton's laws best explains why motorists should b 5hymks:x p3y0.et6 cxuckle-up?

  When you sit on a chair, the resultant force bis bl/ 28eo9zon you is

  In the absence of an externs/t. f7v w ;n(rect0qtal force, a moving object will

  When the rocket engines on t 3aehjp;z hmk 16p/q4yhe starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the sta4hamhyj 1ze6;/qpk 3 prship will

  A rocket moves through empty space in a straight line gn .t-u0,a**, pjd qljyn3 fjlwith constant speed. It is far from the gravitational effect of* a, 3gdjpl-f j,.*ulj q0tnyn any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a movin6 66 xqsl;*dcbgjsw 5pg bus, facing forward, and you suddenly fall forward. You can imply from this that the6 b 6wcjs;65xslq*gd p bus's

  You are standing in a moving bus, facing forward, and you su1nrstae 3+ /7i0s hgwmddenly fall forward as the bus comes to an immediate stop. Whartna 07she31mi s +wg/t force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the object93n ggur7w n4ltq,p :flty)p )ik6ol5.

  The acceleration of an object is inversely proportionw aq m8uuekqzp*:jgnxh:7 / (ggi7.8fal to

  A net force F accelerates a mass m with an acceleration a. If the same net forc;q e saaygg* (7bgt+cpg-1q0ae is applied to mass 2m, then the acag-y0qsc g*g b;e7taq( a+1pgceleration will be

  A net force F acts on a mass m and produces an ap7t0) yr:jd7s4rp g izcceleration a. What acceleration resulsr 07y4ip:dzg )7jtpr ts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and n1:h a7htx7jf;,kz gmthen release it, the balloon will fly away. This ikah:;z ,g xf 7nhj71mts an illustration of

  Two cars collide head-on. At every moment during the collision, the ma) 3;gvo 8hkifqgnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts oo8qgik )3;fh vn the first. This is an example of

  If you exert a force F on an object, tk ely7f+7/k :j1i 1ezaty iq(nhe force which the object exerts on you willzikjq ya7+e/1kf it 7l1: yne(

  Action-reaction forceycxv 1l;rgn py0r7,+fnc7pu 8 s

  Action-reaction forcese xiqlba1u,g/kk35x ayi12 ios 2+(xf are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damawn.xw an .z24nge to the car. Since a lot of damage is done on the cn4a.w.nx2w zn ar

  An object of mass m sits on a flat table. The Eartx/cb + t4,cp8pjqs2wwh pulls on this object with force mgqpcxw 2tps+/,4jw b 8c, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means o+j xnq (n;0c l+,t nxwjwg77xof a string. The Earth pulls downward on the toy 7 cgjx 7w(0,+l n+;tjnxqnwox with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 9 pt6x2rm h fui15vej;1500-N instantaneous force. The ball hits the bah25 9um xe6vf tirpj;1t with an instantaneous force, whose magnitude is

State Newton's three la90jbi9 m- , x4fwe od-p kbhtdmm4c4m8ws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Eart5dsjm8sm;w.2b ns/eyox m4 k+ h. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared toejy /b.d 8 kmomsw2s+;nx45sm Earth?

  An example of a force which b d8g,le9kf-t acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a persgi -z-yyh,3bn on weighing 600nh yy 3iz-g,-b N?

  A stone is thrown straight up. At the top of its path, the net fora.ktvpd2n -g2a: zeq;ce acting on it aqp-a.k d z2 tvn;eg:2is

  A 20-N weight and a 5.0-N weight are droppl,z7p ndxsfpi( r 3q39ed simultaneously from the same height. Ignore air resistanczplx,s 79dqfr( 33pine. Compare their accelerations.

  A brick and a feather fall to the earth at their respective td8 n)t/qkstah y+58jmerminal velocities. Which object experiences theqh+kt8y m8 t nds5j)a/ greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator..4ntdeb4dba . The elevator ab .4td4bd en.is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling oh,y1yv . pfok9f an elevator. The elevator is moving upy1pfyv .9hk,o ward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidew,3 zrzfyv5 oxkbu*1e+53bcq malk is

  It's more difficult to start moving a heavy carton fww1r l4:o3zvkzp bh 9xekx2 ,7rom rest than it is to keep pushing it with consta2kk w z x,wp1 4l:bvxehz79o3rnt velocity, because

  A horizontal force accelerates a box from rest across a horizontal surfawulgr26v2 we5ce (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 happenrwegl2 26 5vwus to the box's acceleration?

  A packing crate slides down a9dspf:or ) s baxx+;a3n inclined ramp at constant velocity. Thus we can ded pd9xxf:sa)3;o bsr+ auce that

  A block of mass M slides down a frictionl4l-p slh oh8b)ess plane inclined at an angle q with the horizontal. The normal reaction force exerted by 4h p)loh-bsl8the plane on the block is

  A block of mass M slides down a frictioe( ljm3 lwvwg(w11l(iky k: 0inless plane inclined at an angle q with the horizontal. The normal reaction force exerted 1l y1lvewkgi w3jil :k( m0(w(by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined atlx pv8i2vm +h3 an angle q with theh 2pv8xvmli +3 horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2tt4zokicl 3a 9e h9 vu-:b8*-jzv(kyd .0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration afk okz8hi ytjz(9:vub3t ev 4c*a9 d--lter being released.

  An object sits on a frictionless surface. A 16-N force is applied ty.y q h5ms3zo/t(gj /no the object, an.5s3znh m/ty/j (go yqd 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/11fcjp;jwv 6 x j/med jv7)db/s in 7.0 s. What is the averagecjbe)vp1dwjm;6f/ vxj7d 1/ j forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What isv) u(dic5dly7 the net forvi7cl)y (u dd5ce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/k g)7+klvz0q x,ln1mt;lb*d us after t;tz0 b7) 1ngdlkmlu+ qk*,lvx raveling
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 samee y7 .pz.ri0yn,epk .bi ao/u4 force that you push a 10-kg mass from res., 7.zop yiu b0eiy ep.nak/4rt,

  What is the mass of a person whoxm* l xwdj;:*g weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Ear,y 5lye kzxr52m s5swd(el 54+kqdz, ja ua6n,th where the acceleration d5sl56z,,, ew ylxydeurqzkja(42k +5mda s5nue to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the + 8nv fdb bne64dl04qhEarth. What is the mass of the object on the surface of 6e q4 bdlh84+nnbd fv0the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on rlht )z 4c q,;n(.8 cq2olwpeaEarth, and object B weighs 40 N on the Moon. The Moon's gravity is one sih2) atn e4czcll ;pqo, w.(8qrxth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5/02rgq xc+9 fxrm xtd).0-kg rope. Sue pulls with a 15-N forc) xrc+9g2x0/drmftqx e. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on atb,0jrx;-.ary)/ r kv1d:,f9 d nka y1kgz aqk level frictionless surface. A force F acts on the stack, and it accelerates9a:/dkjgb-t1rk.axa)0kryqf1 zv ,,rnk dy; 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 stands1uc5lz3 / vkjdw2biyzme0s/* on a scale in an elevator. What will the scale be reading when the elevaj031bmvw*/dlecys 2/ u izzk5tor is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevfy;ve(; thy.g(fn f -eator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an a-y;fv;heg(( fntfey . cceleration 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 60.7,pab+bdx:u ;g )7k -cq-bkegps, edq0 kg and the elevator accelerates upwardb ,7p :gbdeuqs pegdac)7xk b +,k-q-; 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 mas,b9j,efgt .wds. One force has a magnitude of 8.0 N and is directef ,9wetgb,d j.d 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;9e6fls xo4 xl(kqs c5 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 is traveling 15 m/s, what is the minimum stopping distance if the load is not to slide forward into t9ll4 qos ;5exs(kfx 6che cab?

  An object of mass 6000 kg rests on the flatrz z9 s,cg hx22teks8-bed of a truck. 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 stopping time if the load is not to slide forw, xskzh-g2s8zt r2e9card into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, zhv vfw0was: +8 8t6 cjjl/rec/ge-v,what is the magnitude of the acceleration of the system? (Ignore friction and the mfg/08ez:l c/tvj he6w rvcs j w-a8v,+ass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kgyo0 hlt.6 nh;rals 8c2, what is the tension hc.n r8 6 os2ylathl0;in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books o9ja*-iu lgy9oagk ,,- bkru wm(tp9+jn a smooth horizontal floor with a force of 100 N in a+ 9akyr(u w9jg,-* ag9,pijumlo- btk 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 sm c6 pav(f525 pgdoehm9ooth horizontal floor with a force of 100 N in a directiofpde526 (mcp5hogv 9 an 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 box?

  A traffic light of weight 100 N is supported by two ropes as sh) vtto0(toji6 9s;ivv 4rlw9pown in Fig. 4-2. What are the tensions in 0)9iji 6;vvl(w9ov pto4r sttthe ropes?

  In Fig. 4-2, if the tensions in the rope0il)s.yhd7 t s)czko 0s are 50 N, what is the mass of the traffic y0d)l70 t)ossiczk.h light?

  Two boxes of masses m and 2m are in c ,xut h /rhk(iu6qbt66ontact with each other on a frictionless sur ur6( qht ,kuxb6t/i6hface. (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 other on a frictionley8bkwl.:7d* gqyx1 tzb-ta ox(.nyb f wt85p8ss surface. (See Fig. 4-3.) What is thtx- lwk.pt7bb5x. q fga nyyod:tz8(*8y1b8we net force on the more massive box?

  Two boxes of masses m and 2m are cotnk*)s3an soak42w9bd m o: b+,rs y)snnected by a rope. (See Fig. 4-4.) If the forward force on the more massi9k ),tyosk)so3 a2 wn* sbrnm+as :b4dve box is F, what is the tension in the connecting rope?

  Two boxes of masses m and dxc3dqz 9.u7q2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive boxx q379qduc zd. 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. 4-5blq0s:ki6 i,4jgob7y. Box I,b7g s4ik:bo0j lq6iy 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 b epliyvh1 .)5rox and a desk are 0.40 and 0.30, respectively. What isr ve)5.iyl hp1 the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and ku:r1,m1 e*; 763o lqv vs8umvtcbotbpinetic frictions for plastic on wood are 0.50 and 0.4pomte3lu6 vvu;c1 o8 vrs:17btbm q,*0,
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 direction. It slo dh4bgt,3j z5mws and comes to a stop with a constant accelerationbtd5hgz ,4m3 j 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 suce*t h/m62y xhrface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acc6/ hhem*ty c2xeleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg maa8zs6czwye,/wnl)ex( ( .qoh xemu79 ss, 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 cc: 2kj(;kcfq/zgda1 m/*jff, a puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What ff1jaq //m(: ;*d jcgk2fkccz is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find +.7 htlur0f.85zgb 0jaoku ; j wf3dkhskid marks 90.0 m long. They det l0fb+0fhgd7zh.ro k j.k8 j3uuaw5t;ermine 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 the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fifw2c64woe 64+ g s1sp ebwg0nog. 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 static frw6 nfbgc0o+2pg1es 4 6wws4oeiction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface between 5glh 9h lu ll19q,2kelthe more massive box and th 12l5hh l ,lqulg9le9ke 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 the boxes?

  An object is on a frictionless inclined plane. The z-6vmrre b+h2 plane is inclined at an angl 6mrvzehb2+r -e of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes axhvn sikl 3. pd+5qk/.n 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 u aogp 21i*fmj8,af0t inclined 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 an angle of n 4dvn):hnd9p $35^{\circ}$ 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 4e,upo) kft m42f ypx1constant velocity of 6.0 m/s.p p4 fxu,t2oke)4f1 ym
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 a rougz* igy9dcg(bbo i,2/1ok t b(th $37^{\circ}$ 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 g:rpp-51fw0f o m -tdga 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 att*7s+dx re ucu:l ;stn.ached to;cr:dn 7stxu* .e+slu 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 incline9 fjb6-ue u2iu:fm ;ljs;dh5he6 :iem d plane tilted at an angle of d u:6:hu 9 2mbei e;-s6eui 5flf;jjmh$33.5^{\circ}$ 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 of in wh odo3jm,08rcline is gradually increased until the object begins to slide. The angle at which this doo 8 wm,0hjr3occurs is q. What is the coefficient of static friction between the object and the plane?