Which of Newton's laws best explains why motorists should bz, *biwn34;l5u6 7njlebk g azuckle-up?

  When you sit on a chair, the resultant force on -tt14lb b b5sbyou is

  In the absence of an y-g6hhro,; py external force, a moving object will

  When the rocket engines on the starship NO-PAIb+:rtiz :9 rqcN-NO-GAIN are suddenly turned off, while traveling in empty space, the zt9 :iq+:rc rbstarship will

  A rocket moves through empty space in a straight line with q3hfaf1d zz8* constant speed. 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 sustain its motioffzd8qza*h3 1 n is

  You are standing in a mk c m:xo40vvls ,g49m 0(de* ma9nobbpoving bus, facing forward, and you suddenly fall forward. You can imply from this that the bub(evx lgsac9 k *4dm0 np0m:m49o,v bos's

  You are standing in yw8h0z gckd*dql8y. y2, he9za moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fallzw.y8egd2y,0c 9dkl*yzhq 8h forward?

  A constant net force ac vsjj71w ye,ljok22k/1 h(ym9lh)sf x 6jlwm+ts on an object. Describe the motion of the object.

  The acceleration of an object is inversely proport)5sggg3gv7as(qia f *ional to

  A net force F accelerates a mass m with anrqvgun gp+ q:d-+7 g4g acceleration a. If the same net force is appld:g+ vg-ugr gq4+n7pq ied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and g + snei)k,9lqkv0/ol produces an acceleration a. What acceleration results if a net forc li/9+v0sn lekq,ko)ge 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly ag/3yjc2bc 7 wnway. This is w / 2cg3cjn7byan illustration of

  Two cars collide head-on-b+pa k jd4o od*tq6c6. At every moment during the collision, the magnitude of the force thjca+b p*d4okq6ot - d6e 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 force which t bn iyi9hc: kdtd c+gf9i2(/o+he object exerts on you willd +: doicc9igfkhbtn+ /i29 (y

  Action-reaction forcesvefx )t*mh)rxb7q9*s: mkme rvh( ;s5

  Action-reaction forces arev dn k2:igof+6

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to x o/+-v3sume1mdmrl+ the car. Since a lot of damage is done on o+xsm3/ el1+mdmru- v the car

  An object of mass m sits on a flat table. The Earth*+z(w*fkj ctz pulls on this object with force mg, which we will cj+z( cz*f wtk*all the action force. What is the reaction force?

  A child's toy is suspended from the ce12 k g6y5y-an-7uz iu :eaa3y(juhau oiling by means of a string. The Earth pulls downward on the toy with its5 :u6au3auk7 n-au-oig a2ezj (1yh yy 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 1500-N instantaneous force. The bx:l6lhkdivj4-llq-+q 6)c n lf0 p2ndall hits the bat with an instantaneous forllp f4q0 66 qlcliv2n):h nl-+dkjd-xce, whose magnitude is

State Newton's three laws. r;f6bwa/.mb:u efkw:

  Mass and weight

  The acceleration due to gravity is lowererpj) - *.whwm6g jb3n on the Moon than on Earth. Which of the following is true about the m 3mh ebj)jw*grw p6n.-ass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a disthwsol b.3tp lx:4s9(nance is

  Who has a greater weight to mass ratio,t7j9;sapl rv9 a person weighing 400 N or a person weighing aj svr;7 t9p9l600 N?

  A stone is thrown straight up. At the top of its path, the net forew*ro/5o;3 p9 qgnjta ce acting on i;qwj3atpo neo 9 5/r*gt is

  A 20-N weight and a 5.0-N weight are drovmrp .m:r ,ye+pped simultaneously from the same height. Ignore air resistancyr,rm.p+e: mve. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminu(d mj +sj(vq8al velocities. Which object experiences the greater fojdv +ju s((8qmrce of air friction?

  An object of mass m is hanging by a string from the ceiling of an elpny;npcob49 p7i 6*g ynvo,;levator. The elevator is moving up at constant speed. Wpy ; 94ovlg;ipn7cy*pnnb 6,o hat is the tension in the string?

  An object of mass m is hanging by -7ewjdd nt5t9c6-f 7k iv-ccsa string from the ceiling of an elevator. The el ce7v-jdcd75 tt69-w cnk-si fevator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on x1ak :zu (*o5*ir:5u7lyc fzjwn 7ii(od)y puan icy sidewalk is

  It's more difficult to start qa*h*, va aef-moving a heavy carton from rest than it is to keep pushing it with const,q-v f *eaa*ahant velocity, because

  A horizontal force accelerates a box from rest across a horizontal sur8u6 p y4ysg;xdface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception tha;yx6syu4 d8pg t the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant q ;3ixsxj(5 ) ls1e2sjd 7w8ddlk5meh(s,nwa velocity. Thus we can deduce that;e2sh5js8) k lwm7d1n5lewd xqx jda(s(i, s3

  A block of mass M slides down a frictionless plane incucomv201bloxg 19 d9llined at an angle q with the horizontal. The normal reaction xog l9 1co v1udlm092bforce exerted by the plane on the block is

  A block of mass M slides down a frictionless plta,b)21ebxjv s/zum ,l a*yw .ane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the blxe/zbbtl)v aa mw21,s.u,y j* ock is directed

  A block of mass M slidki4rkp;6 llw3 cq5ffb f4k8m 1es down a frictionless plane inclined at an angle q with the horizontal. The gravitational force is dire 54 wrkpc4f;6 b18q3ikkll fmfcted

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined planl8 bf8fu xplcha0yw. ) 1-ear+e that makes an angle of 30e with the ho)+fca-xyhrbua e0p8fl8 w.1 l rizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictior ihz)r3vp ydx9thlcby7 kq701u:f0n r;)nx:nless surface. A 16-N force is applied to the object, and it acceleratesy)d in09ur0bvr)t 3nlch ;yxkz qr h1f7p::7x 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-y rp6 8y9yckx in 7.0 s. What i9pkrc8y- y6xy s the average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed ofjbgjj b;+r pwv58tujpt8r- 8 / 8.0 m/s in 2.0 s. What is the net force acting on the bod5pr/jtrpjubj8;g8 v8w btj-+y?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/cy4j73:q1r. fksdk tq s afte.k4jqft3cy r7d1qk: s r 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-kgm5ux68mobe dzq ud5rt2.4n z ( mass with the same force that you push a 10-kg mass from rest,m6u.d5o5bex q (nu2zrt8 mz4d

  What is the mass of a person who wei*ksz-nkf6i)k1tibj0se ea+7 ghs 110 lb?

  What is the mass of an object th6sui *boc zj4m62ld-3w t4dqcat weighs 250 N on the surface of the Earth where the acceleration due t4cdsmbid34wl2j 66 toqzc *u-o gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass 19ryi)t0uemuf/q i1 x of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the / it0q1i9uef1xmyu )rEarth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Movyx6ub3n m f9 ij..l8opeu-t*kshv 8 +on. The Moon's gr 69oyu iv8* knemhbx .ft+sl-3.uvj8 pavity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are havizmb lmr.rev 2rl43eo v0w7;) acz:7 yyng a tug-of-war by pulling on opposite ends of a 5.0-kg ropwmrvrl47 czey :e a r0o zyl23vm7b.;)e. Sue pulls with a 15-N force. What 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 acts onlf-t nr4)n g1.eg e)m2h u5jmm the stack, and it accelernmfu)- .)hgte4m nj1 l2gre5mates 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 ong.0b z-k(q4*x9hbe6emze bld a scale in an elevator. What will the scale be reading when thl6b0xm g9d4b*q.ee - hzbe(kze elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 kg 4g8sfts5yd)pd8 4wqf and the elevator accelsf 4fd d84w8p5qtg)s yerates 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 /dy spr:mreva lca((( -v27moelevator. If the mass of the person is 60.0 kg asrlv (maoa/m(rey(-v : d c27pnd the elevator 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-dvg/ej1ml0d+ i83-wvy id sd-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second vdi dvg8/y3m0 dl1-jies-dw + 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 flatbed s7 psyq,:jd3e9bovk h7),l++ wrfgd 4 fc.j ivof 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 forwar 9,sbf3j4,edh:.qw+pjc)g s kv+li7do yf7vrd into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in place trymu9f z c9avi:r4+lucj v5e : n,3q(by metal brackets that can exert a maximum horiun f9j5+4cl i zq ae3u( r,:myv9:rvctzontal 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 forward into the cab?

  In the Atwood machine shj 9p1s,fieq8+1bv h3:jev i okown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frsbiv3 8,he 1j1:kqpf9oj+evi iction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, wz5zn s:dup3w7 ag/ mk2hat is the tension/azpu5 kwnz372gs md : in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floorg(9nqv2) 8u ffd bopa9ev;l;v with a force of 100 N in a direction ofvbu);9 v;oql(v2en ff dpag98 $37^{\circ}$ 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 br wef)3r- 6qacooks on a smooth horizontal floor with a force of 100 N in a direq)wa6 rcr3ef -ction 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 eij ,amor2 ;s/supported by two ropes as shown in Fig. 4-2. Wh/iers j;,mao 2at are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes arer/ea zzz 1ht*o3x+x g) 50 N, what is the mass of the traffic ligz zeath 1)+o3x/r zg*xht?

  Two boxes of masses m and 2m are in contact wi xtu.-z hvxw +/o0:bmz)i-mca th each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the mor h c0au./mi:w ) bt+zxz-oxm-ve massive box?

  Two boxes of masses m and 2m are in contact with each other on aw 09v t-9gz pvevf1ve) frictionless surface. (See Fig. 4-3.) What is the net force on the more massive 0wt9)1 evezvvf-9gpvbox?

  Two boxes of masses m and 2m are connected by zh2vx lch*azr: 2*;gka rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting ragh2xv 2; czk *rh:*zlope?

  Two boxes of masses m and 2m are connected by a rope. (See Fiirkdur/07 kmer-z fu.-k,r )wg. 4-4.) If the forward formdzri/)-u0 rr,kk fr7kwe.u-ce on the more 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. 7opemb s ra-bnw05c5l)4zj/oi 0g/ au Box I of masar seg4 b/5-7zpo/jo0n)blaw5 mcui 0s
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 deskvmcsz(vo : i/- are 0.40 and 0.30, res(:ismo cvzv /-pectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static:wlwnd 5+p+ bc and kinetic frictions for plastic on wood are 0.50 and lb+:wn+dpw 5 c0.40,
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;ab l vcnlviy bkk s-36-,:x9f the +x direction. It slows and comes to a sc6 vv9,;x a-:ibkb ll -3nsfkytop 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 su8 u t07h0 yh yc/w7qkprx-zd(c. gdx:lrface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. Whatyx70 r70cqpk-:(duh./wg zltc d hxy8 is the acceleration of the object?

  A horizontal force of 5.0 N acceler+.xpb9nad 8uq ates 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, abnve;-,7hmg j )s-oks 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 frihe-knm,gsb ;o sv)-j7ction between the puck and the ice?

  During the investigation of a traffic accident, police fnx(.0jq wc9ib ind skid marks 90.0 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 speed of the car when the brakes were appliedc9 nj xiq.bw(0.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface bety lx7e(zqk/7y ween the more massive box and the horizontal surface is smooth and the surface between the boxes is roughkzy7lx7 (e /yq. 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 m3. ttote4g 50c q(3xm* dv5v3bibagaace 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 static3 b55*3v q btmag.metxc3(4viga0dto friction between the boxes?

  An object is on a frictionless inclined plane. The us(vc9rauu 3g7f;v6y,a ) rlo plane is inclined at an anglou (ur)vaav,9;y rcusg f673le of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill thzisl+c:wc9 ) aat 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 angle of s pr1. x8;*g1l(*wiyowfkpc4i rh9lr$37^{\circ}$ 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 ybfw;m b3d+d 4jc s:v,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 mm8kvbt:6kk *b 1my*v 6ofx2mdirectly down an inclined plane, at a constant velocity of xk8:61kvkbb *v tm2*m mo6fmy 6.0 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 slides down a rou l7cwv70 q-(r y*zmt px03jp3jxh pyd.gh $37^{\circ}$ 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 downe/wp +k.kc58a.x 6kz pdir,or 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 surf b cfevllnp+z.86u 70yace. The cable attached to the log makes an anglfpl8 .u 7bey0cvn6 lz+e 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 tilted at an angtct3 k)zr9 )bdx7vf 5cle bt39cd)7c5t kvfxrz)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 ano+w/q 1i-aaaat-d oc 9 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 coefficie d/aqi-oo a taa1c+-9wnt of static friction between the object and the plane?