Which of Newton's laws best explains why s8p*tgcguq0xa- u, 3 fmotorists should buckle-up?

  When you sit on a chae1qjkis,.j -n ir, the resultant force on you is

  In the absence of an external force, a moving object ,dp ;gi7vgy5+;f-z f jydz7xwwill

  When the rocket engines on b88xd4 (5 3d4iszmn3 ew cbuvbthe starship NO-PAIN-NO-GAIN are suddenly turned off, while trav5 bbun c84(d3ewxvmbs 438izdeling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant0parl,sco :p7ug m7c- speed. It is far from the gravitational effect of any star or planet. Under these conditions, t7u7ra,cpcsom0pg l-: he force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, fac4v*wn :ici a/iing forward, and you suddenly fall forward. :*iwiavinc 4 /You can imply from this that the bus's

  You are standing in a moving bus, facing forward, a3t36/3/3twdbltwe netxpo bd2r7pg3nd you suddenly fall forward as the bus comes to an immediate sttpbe /3/p3g o7xnbdtte23wt lr336w dop. What force caused you to fall forward?

  A constant net force acts on an object. Descu ,e z9bz+lv,hribe the motion of the object.

  The acceleration of an object is inversely proportioniii+e ;4(0xw6xq 49t xymnwqr al to

  A net force F accelerates a mass m with an acceleration a. If the same net fo(g(x a 5qqq* :7 .d7bcyp.yycmx4ucrkrce is applied to mass 2m, thea.7 5py :q7xd(m ryuqy(*4c.kb qcgcxn the acceleration will be

  A net force F acts on a mass m and produum0e ,,o4cosd3*gdv g ces an acceleration a. What acceleration results if a net force 2F acts on4g3,udgso ,d*o ec0mv mass 4m?

  If you blow up a balloon, a)e rwsmvbzl) 5r h) sm7r/1lg:nd then release it, the balloon will fly away. This /mwz )5msl)erv) 1g7 rhsrlb:is an illustration of

  Two cars collide head-on. At every momen1 scuwt2(pox;d: oo.x t during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first.s2x:tdpoo. c ;ox u1(w This is an example of

  If you exert a force F on an obj hruq, /5+k-qu(tcti6rkx(zf ect, the force which the object exerts on you wilr(u k/f th56t(x+ urizq,k qc-l

  Action-reaction forcest 6 65retbvp;n

  Action-reaction forces a8w0w1c)ksjq gre

  A 20-ton truck collides with a 1500-lb car and causes a lot -6dfvc 2ohbjm 8t+s+yof damage to the car. Since a lot of davycoh++ jfsm2 bt8-6d mage is done on the car

  An object of mass m sits on a flat table. The E z8fe52ma q.brm6z2eiua96ivarth pulls on this object with force mg, w ebzmfaa.z86 iiue92qrmv 65 2hich we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a strib8guk t( po/-eng. The Earth pulls downward on the toy with its weight force of 8.0 /-ebu kt g(p8oN. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with.vi 0b c.apy1d a 1500-N instantaneous force. The ball hits the bat with an instantaneous forc0 1pd cvay..ibe, whose magnitude is

State Newton's three lzs)+h40n -hv(1 rm7sps lprhoaws.

  Mass and weight

  The acceleration due to gravity lpynbk:q,5c5 3o yu)r h.3s0qbh8w;o +xaagois lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moox q)b:yk ,syha + chourg5qao;w5o033b8 l.pnn's surface, compared to Earth?

  An example of a force which acts at a disxvrf n.bt .y/q2q,/g itance is

  Who has a greater weight to mass ratio, a person ks++i ;5zjqs zqf)z25s5by ;xicaj5 fweighing 400 N or a person weighing z z5qy2;fqxbj+5i z5s;s5k saf)+jci600 N?

  A stone is thrown straight up. At the top of its path, the ne.+dzgipp8rx7/ g vbe- thn)4kt force acting on it is) bnke4 vg.pd7/z -+ p8ixgrth

  A 20-N weight and a 5.0-N weight are dropped simultaneously f/9)gbq up4n2tc q bu-brom the same height. Ign )qbp/ub n 24cqu-9gtbore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective tgw8qc;nfdj+ a x9n7+3h z1b rzerminal velocities. Which object ecw3j 1+n r7;8 fabg+dnx9hqz zxperiences the greater force of air friction?

  An object of mass m is hanging by a string from tqp* km3:edlq os1./gu6gyb /jhe ceiling of an elevator. The elevator is moving up atbmsqugle 3/jko16:p *q/g d .y constant speed. What is the tension in the string?

  An object of mass m is hanging by p ;z *z+dezp-pa string from the ceiling of an elevator. The elevator is ;pedz*p-zz p+ moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy qo 2nwcg dq7abt*u5);sidewalk is

  It's more difficult to start moving a heavy cartoc+wkzh+k a a:r;w a/w5n from rest than it is to keep pushing it with conskw+hk+ :zaarwwa/;c5 tant velocity, because

  A horizontal force accelerates a box from rest across .zu++fkjhlap y fi2( 5a 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.+ffp2j(yi5z+ uahk l. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus we canal;8* x wxwlatex /,h; x;/ax lw;, hewta8*x ldeduce that

  A block of mass M slides down a frictionlu2) l7 duum4j4gglp/ dess plane inclined at an angle q with the horpuud4g ugml j4d l/27)izontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q wit y23te05fsw cxh the horizontal. The n30 x c2e5wfstyormal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a fric1tzmf1eql+ ykx9 dg st-9 m8x1tionless plane inclined at an angle q with the horizontal.8 1 zkxs1m9-e 19ltqdyf+t gmx The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an m + (d/rgx-idminclined plane that makes an angle of 30e with d+(/m- mirdgx the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applieayy 57nqbivcul)0(;x d to the object, and it accelq) i7;nv(5by acyxl 0uerates 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 tp (*gat+nn q 7/a.k gno7gt-g)zuv0u 27 m/s in 7.0 s. What is the average forward force on vg(tatgun )u. k7+- nq/gtoaz7gn*p 0the car?

  Starting from rest, a 4a(9 loxlbme(2.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the 9 l(e2o blx(mabody?

  An antitank weapon firl0nnw /se*g u)es a 3.00-kg rocket which acquires a speed of 50.0 m/s after 0e*g/w)ls nuntraveling
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 samfx 10z g( k)vrw0tvlxnf3 ,r(ke force that you push a 10-kg mass from resr( vx 0 (n)k0zgl vrwtf3x,1fkt,

  What is the mass of a person who weighek+xqf++v5b at 3kd;plcw6+q s 110 lb?

  What is the mass of an object that weighs 250 N onx-;kl bjx ;uwvic +5-z the surface of the Earth where the acceleration bwi-c;-zuj5x+kxl v; due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Eartmc807 d sqq(y l4hmr3pmcu)d+ h. What is the mass of the object on the surface of the Moon where t8s0 yhpm() 3muql d q4mr7dc+che acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, )k o09e1wa4.vstx,cvv1 (te0 t*qkkaxfaw ;s and object B weighs 40 N on the Moon. The Moon's gravity is vskev* 1k os)w.xa,(1q9t vka ;ea 4wfxt0tc0one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on oppoqm9sg 8vpr0 eso8-+9xtu *nrisite ends of a 5.0-kg rope. Sue pulls with a se+pmt9sqv9o8 0-nrug x 8r*i 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 8.3)bpen2dxc7vq*lzlt jmyy5u0 if)on a level frictionless surface. A force F acts on the stack, and exjy8f7* m div 3. ln t5q2uzpc0))blyit 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 scaleo n5j 5gsu*u:nq6u:ne76 wpkf in an elevator. What will the scale be reading when the elevatorkwun6pju* ne n5s:76q gu:fo 5 is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mh :bhsnu*p3e tf x3q7:ass of the person is 60.0 kg :pt:3sbf hxun*3eq7h and 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 elelqc:g,7mgc b -vator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an ac cm7q,glg-cb: celeration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5. f8h tws,0ka-n0-kg mass. One force has a magnitude of 8.0 N and is directed duehf ,w at0kn-s8 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 flatb9) mcfyz0 zmegv:e-y 8mnq m2s3gd/v9ed 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 into2yf 9zmd8 nmmcg e0zms3/e g y:9v-)qv the cab?

  An object of mass 6000 kg rests oyvfot-pb+ z)i89zxu+3t 2 kdvn 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 truck is traveling 15 m/s, what is the minimum stopping time if the load is 8x3dvz+ it tbuv yfkz+9-2)p onot to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and mqpf n2.fh8(*1vvye rk = 0.40 kg, what is the magnitude of the acceleration of the system? (I8n 2 kprvqyhfv (ef*1.gnore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg anf33( jsn4uzyc d m = 0.40 kg, what is the tension in the string? (I3juc sn f43(zygnore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizo 5aqk8zbfvi ds h.-i-,y/j/sental floor with a force of 100 N in a dirv8.s -jifyqh as, bzi5e-dk//ection 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 +hkjt +w+t2k6rqjj+ cof books on a smooth horizontal 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 forcr+j6wtk j+hc+ t2k+j qe on the box?

  A traffic light of weight 100 N is supported by twc qdn8wspu l+l53g;t;o ropes as shown in Fig. 4-2. What are the tenltudc w8sp ; l+5ng;3qsions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is5l dypi)3w(p r the mass of the trafficp rlw5d)y 3(pi light?

  Two boxes of masses m and 2m are in contact with each other on a frictiz fb* 5x0n0kn,hbhqz5 onless surface. (See Fig. 4-3.) What is theb xf05q ,bnhhn 05*kzz acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionlesm lt5pzyz3f.,zv cwdg/1;)i os surface. (See Fig. 4-3.) What is the net f; py1czzmfv. izd,t /)5wg l3oorce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4b zj;t0 0 nukvq9l8)nifs.o; m.) If the forward force on the more massive box is F, what is the tensionn t 9okl0nzj8u0i).f; mv;q bs in the connecting rope?

  Two boxes of masses m and 2m are conne p3o0a:/arvt v g2c86nmeuy8m cted by a rope. (See Fig. 4-4.) If the forward fo:/met r8vp gn8203oca6y mu varce on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord rjmvak.4 / 1pmnbjr 7m*unning over a pulley as shown in Fig. 4-5. Box I of mas4jmnavjm 1 7pk.* bm/rs
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 .r8 jysr *-)) finraojand kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. Whaa.rjnry -of ris8 )j*)t 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 on wood are 0.50 fzc d(bflrs497wp6 8 cand 0.40b97pds rz 4f8f(c wcl6,
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 ( w j )r(eu(y078e +jom0hu)dv1uhmx zpyf+rca level surface in the +x direction. It slows and comes to a stop with a constant ac+h0j7d )0hxwjrv uy8op1mc +(u (m) fyz ee(ruceleration of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting onbm2oxatu :ak7p q0pbx/123x r a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acc bx 22aua3/ortpp:710kxbq mxeleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from yag8ke-,g68 fauerz* 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, ees ubvl(z7o t0,a(d+a puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coeffici( 7tve+ (o,lbzs0ea udent of kinetic friction between the puck and the ice?

  During the investigation of a traffic a:/b rz w6mxa8d)r. pndccident, police find skid marks 90.0 m long. They determine the coefficient of friction between th8wdrp/6mx:)b z . andre 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 a g2lhtan1 (4wwnd 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface betwan1 gt4wlw (h2een 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 stacked. (See Fig. 4-6.) The su.rw 10 +gdj3basc .a2yedf 6mdrface 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 betw r wa f.bcy+ddjd1ms6e 3.02ageen the boxes?

  An object is on a frictionless inclined plane. The planeut/xx,p5istj qc l,-) is inclined at an angl-j5t ,)x sc /t,xqilupe of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a fla- asdy2k zwfqx/: y2la 14vd y+1u 5xn4tjd5fwt hill 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 an68 (n;/slb j6hcwtzor 9q)ih egle 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 tib0z5b -n hj(jr 5ga3mwlted 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 coomzlzqf a tss:go,d 7wc 5/,; (1la4gznstant velocity of 6.0 71, z ald,os sfamzo:gc4twg(lz ;5q/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 roughk*lx-b f w;vq6zo xz81 $37^{\circ}$ 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 a roys6dnjcqzzcy/.6;nzmz -2*d ugh $37^{\circ}$ 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 surfacewsnyi:ww wk75alf f 07zl4;-w . The cable attached to the lo;:7 w4lwywiwz570- fflwn aks g 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 releas/jg9h.i 8vgq7v- x f co+ r9r-8nhcchjed from rest on a rough inclined plane tilted at an angle ooc j8xhnv +-iq 87 j9hvf-gc.r g/9hcrf $33.5^{\circ}$ 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 angleg6h)f s nyy*vd;dw hk(di1b/2 of incline is gradually increased unti2 siyw;* )(fbn1 vykgh/dh6ddl the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?