Which of Newton's laws be :b:re)ehhq0//gvza qst explains why motorists should buckle-up?

  When you sit on a chair, dzng4c m e9.(athe resultant force on you is

  In the absence of an externa :ju nu2p*g) t,nqsrc4l force, a moving object will

  When the rocket engines on the starshijjb tdcn-y1.v1- .zd rp NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the sta1td zy-dnjj1 c ..v-brrship will

  A rocket moves through empty space in a ia ge 7v ;xs52l;9mkogstraight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditionss;l o592k;vigg emax7 , the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you sudden46n,k sns7xkw5 t q.agly fall forward. You can imply from this thatgqs.,tnan 6k5w7s4x k the bus's

  You are standing in a moving bus, facing forward, andf((6zg1xr hmql6enq5 you suddenly fall forward as the fhrxe(m6qq16(g l 5z nbus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objec3 zksrr)zj/ g.t.

  The acceleration of an object is inversely proportional to 8hjyuht kr7x4hh;iww;1 3(co

  A net force F acceleye4n38w ygny 7d(d8m0/gwgvb rates a mass m with an acceleration a. If the same net force is applied to mass 2m, then the acb8yyvn38mgyndgg7w d(0 e/w4 celeration will be

  A net force F acts on a mass m and przh+4l7 k v8lxvoduces an acceleration a. What acceleration resu8k4+lvz h7vxllts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. This cv x)0 oeov 6rkre0-f)i )o)v0v- fc06x kereros an illustration of

  Two cars collide head-on. Ahpi mb5:i+ge8 na87 yzt every moment during the collision, the magnitude of the force the first car exerts on the second is exactly e8p8 ne5iazy+ :ibhg7 mqual 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 whicha ,5j:khywqn5 0(p4tcv 8x,mlydj8ij the object exerts on you willc: 5q( 0,jhya58m8w4j, ly vkdnpjtix

  Action-reaction forceq 1mi -du; +qs 3ulz9qgr2qj,rs

  Action-reaction forcesp,+6nquj x8 7 6zaixip are

  A 20-ton truck collides with a 1500-lb cz,vh68 4q kyq9o n. g- j.afsdcfn9p(sar and causes a lot of damage to the car. Since a lot of damage is done on the cg h9v s4q9,jd pn.6ykf( qz8a-s ocfn.ar

  An object of mass m sits on a flat tabyi0v+f6qqgs(say 56m-z-ea r le. The Earth pulls on this object with force mg, which we will call the action force. W se v( mgyqaf0zq6i-a 6y+5r-shat is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Eartz1o. o.wb+ hxr:tpod.8;a sqqh pulls downward on the toy wi;qzbr1o. x dq:w+ oh .sa.8potth 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 150zk7i,f ntih/q- o5 jg/0-N instantaneous force. The ball hits the bat wikqtj/g -ho, 57iz/nif th an instantaneous force, whose magnitude is

State Newton's three laws.utnnyo v,l(ddlbz0 4 2o 6:je0

  Mass and weight

  The acceleration due to gravity is lower on the Moosd8 c.-*kkrp wn than on Earth. Which of the following is true about the mass and weight of an assd .p*8cw -kkrtronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance8di-ch6z8 m 8 .gnab4vfxr;s z is

  Who has a greater weight to mass ratio, a person weighing 400 N or ez3 enf2jjx( bu47 s/rc1vzu7a person weighing j1fb 7 4/unz 2srzc7jux(e3ev600 N?

  A stone is thrown straight up. At the top of its path, the net forc:h0en:bj .h bce acting on ceb .n:bhj0: hit is

  A 20-N weight and a 5.0-N weight are droppeu,a ut5ffr+as 0y1 td9d simultaneously from the same height. Ignaf+5 fdut,rt y9s1au0ore air resistance. Compare their accelerations.

  A brick and a feather fal*it-,uqu : eg px(cz*fl to the earth at their respective terminal velocities. Which object experiences the greater force of g(:te-u u *icfq*p xz,air friction?

  An object of mass m is hanging by a string from the ceilwe8s t/ pw:o6fing of an elevator. The elevator is moving up at csw:pf6w 8 t/oeonstant speed. What is the tension in the string?

  An object of mass m is hanging by a string 7 qqfx:kc4djs em-62 8es 1kstfrom the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tensioseksx8q64-dt j s: 7f12qcmken in the string?

  The force that keeps you from sliding on an icy 6 tbdz mm p:l v8:ofz/./0qch-+ zhtagsidewalk is

  It's more difficult to start moving a heavy carton frp1v2(lb ) mpnnom rest than it is to keep pushing it with constant velm2bn p1n) vpl(ocity, because

  A horizontal force accelerates a box from rest acr8sv4 o 7(ex2c,asrkq voss a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the7,4sv sor2 8q(exva ck exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant veloci rji/ v12 glp:da tf)4)rsj(ehty. Thus we can deduce a1et r(gjpihv4d)j/ r2 :lf)s that

  A block of mass M slides down a frictionless plane inclined at hx b15mf(mc :fan angle q with the horizontal. The normal reaction force exerted by the c:h5xmmbff(1 plane on the block is

  A block of mass M slidi( )4gi;qxj yaes down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted ;y4gx)ij( qai by the plane on the block is directed

  A block of mass M slides down a frictionless plane -pg6vum(p p 7nuhm-p-inclined at an angle q with the horizontal. The gravitationughp- v m7-pp(n6pum-al force is directed

  Two toy cars (16 kg and a9lh j h19:/s5t2f1iacf yxmg 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their js9/1 a51 h9:xac yith2f lfmgacceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied t7s ol8v1eo buuv5k,u3 a*rpe0 o the object, and it acceleratr 7o*a1,k3 o85v0uupbsu ve eles 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 7.0 s. vcpd +p+o- c 0cayod6-What is the average forward forcop+ao6 0d pccc dy+--ve on the car?

  Starting from rest, a 4.0-k)0.wqovij m tn8bvi/4g body reaches a speed of 8.0 m/s in 2.0 s. What is the net force )v mqnbi /84 jvt.0iowacting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speebz/o2:p z z s6ba5v bmttr)wipw;r+3kt8;zx/d of 50.0 m/s aftati+z)bb/ x:p85/3 z2w s;k porttw;mzbrv 6zer 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-kg mass with ) :rui.d-q/tt9uzgyhmt - ql8the same force that you push a 10-kg mass from res: g /)hudrzt-y8mt.qt9uql i-t,

  What is the mass of a persgs3 ouevu7)ivw q9 /g/on who weighs 110 lb?

  What is the mass of an object thabz4yg dl.7r(y;,n )qbm,ntlg t weighs 250 N on the surface of the Earth where the acceleration due to gravity is ,qg4n;yr,l).7dgz bylnt(b m $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. q86su pl2mgp4 What is the mass of the object on the surface of the Moon where the acceleration due to gr pmgqu slp2846avity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. Ts),xwo,huf( ) 5 forrzhe Moon's gravity is one sixth of Earth's. Compare the masses of the objectr ,)rzswx f, foo(hu)5s.

  Sue and Sean are having a tug-of-war by pulling on op5ej7mse,tapmu6t 9/x posite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What ise t5stu7j9pm ,m e/ax6 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. 32y f 06sl9ggpfkeiu7 x/oc.cA force F acts on the stack, and y6kusg.f9e2ip7x0 3 cof/lcg it 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 4802c cm-lf5+kv; 7 dtfk t-kx5b0m)rlmy N stands on a scale in an elevator. What will the scale be reading when the elevator is accr2f5cl7cm)kxmv0t-;k d+t-5 l ymfbk elerating 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 vm:cs9h7r+ 7 xfh:ox.t+ up uiand the elevator accelerates downward trhoh uix+9smvucp7+x:7. :f 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 of theg(-r i -krx:cq person is 60.0 kg and the elevator accelerates upw(x -gq :rrck-iard 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. O2it2-ikr ud ,zne force has a magnitude of 8.0 N and is diuiir2zk2 t,d-rected 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 t;q43daeli+4z dr v)wu he flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal forcedr+ ) dai4 ;eu4vwzq3l 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 kg rests on the flatbed of a truck. It isjspf.dgc3u- v6mw0w + held in place by metal brackets that can exert a maximum horizontal 3.mgvd6wwsp -c j0+fu 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 shown in Fig. 4-1, if M = 0.60 kg a dv pcf.mmdre.w*h382v.j h/znd m = 0.40 kg, what is the magnipzjce.d 2. w3*d m8vm.f/rhhvtude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40o cqo7gw, +jzzr 6me)0 kg, what is the tension in the string? (Ignore friction and the mass of t oz6)mz+gjrc0eq, w7 ohe pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force of 100 j/4roti ocw7er* 0f1r N ri1o0c/o4 jref*wt7 rin a 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 smooth horizontal floor with a qum. 3 /tu du,wbqq ycpa5-r9hqou(x6/kjn/6 force of 100 N in a directio9 u// ,qxomdhw b5y636 .u-nu tqrj(cqaq /ukpn 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 10;n93u **lyj sy6 obbi4*ib czu1:cmmo0 N is supported by two ropes as shown in Fig. 4-2. What are t o y3c*j z9iby64;ub:obl*1i ucnsm*mhe tensions in the ropes?

  In Fig. 4-2, if the tensions i4p p/hq* pb(ko jfaofg3ohzt/* k-6 e,n the ropes are 50 N, what is the mass of the traffic lf (p/zj3o /b*pq*pak fghtho,k- 4e6oight?

  Two boxes of masses m and 2m are in contact with each other on a fricop(om)d6wjh . tionless surface. (See Fig. 4-3.) What is the acceleration d ho(om) w.6jpof the more massive box?

  Two boxes of masses m and 2m aru/4on, s ur6khe in contact with each other on a frictionless surface. (See Fig. 4-3.) What is k rh/4u6, nsouthe net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the.la*ga/1xsn, t cx o86qr q4sz forward force on the more massive box is F, what is the tension in the connectinax.x1* t/na 46rq zl sscqo,8gg rope?

  Two boxes of masses m a e774/rzm8owx1qp skn nd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the lessn17se x kqrm p4o78wz/ massive box?

Two boxes are connected by a cord running over a pulley apez n z2ee7t5-p f(h;x4+sg n8jvp j)fs shown in Fig. 4-5. Box j-vz +epx2 f)t7hnz;e n5 j espp(fg48I 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 j y:oeaa)0kvru8qp4/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 p 8a q4kuj/)eaoyr:v0horizontal force is applied to the box?

  The coefficients of stati:x rja5/0ra7rsgu*i0bm+ 8i 2kh e qegc and kinetic frictions for plastic on wood are 0.50 and 0.40r*ri0 :q8eskm ub5hj7e 0 ggi+a2arx/ ,
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 l w9zn ;vom (27-luyb .2bheanvevel surface in the +x direction. It slows and comes to a sh;lwnyv. -9227b(a nvz mbeu otop 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 ma s)+ii qh2;ibt8b6ca 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the objecta2hqcb 6i8;i+btmi )s ?

  A horizontal force ofd onxc*:,n 4frhf1 ey: 5.0 N accelerates 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, a puck is given an initial speed of 10 m/s. It w1lc- 6c4.ghx0s uowu v* .ossslides 50 m on the ice before it stops. What is thh scx -u*4.wo 0sc6vsw og1u.le coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid :+a bcw idq;gpu1*qx ise x)p0er4)y/marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.5 40xi ))psd xyqi;+wrq1cbpeeua /:g*00 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m aremt 49teepe chs6z7irk 451:ry 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 :5r r194z67cyt4kse mepithe 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 surfac9c)gm5sf -+o2 ynpyxge between the more massive box and the horiz+9yf gxyp-2mn g)s5ocontal 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 plt-4mo2 tp(ekvylrl 15 v)g6zy ane is inclined at an angle of tl)tovz5 64ylm-g2v1pr( yek $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of 4 6 qz5nw3y5lb4sii+oqsf d i4$10^{\circ}$ 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 azye ,r8dbjdml ui5-7 :ngle 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 pk50c4k8y bfs,q ew.3bqgnti 5lane 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 direyktyjzvr4d3j 6w0 xu/-o* -mbctly down an inclined plane, at a constant velocity of 6.0 mzw4u/ojr6d3 vxb y-*ykt -0jm/s.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a masso.93sg i/go*wa l*, dqe dafg1 m 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 slides 0 f vk;9-k:w,cjingljdown 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 surface. The cable attachi k;k v 8yoqubn/.io-2p0c ei9ed to the lo/nk iocik8vou092;ip.q- b yeg 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 (c5;ddrev/d /x.t;b+*wsnn mmx aow: a rough inclined plane tilted at an angle o wa+xd( v d//:sodnrm;wt;c.5 nem *bxf $33.5^{\circ}$ 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 ozj,3 0j7y4s3 k9xu :clv znihhf incline is gradually increased until the obje47 k0shhlx z:33jjvicy , z9nuct begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?