Which of Newton's laws best explains why moto/v 4s+jhxc/.dn u6u rbmmy; z,rists should buckle-up?

  When you sit on a chair, the re nta(za)i.b9xsultant force on you is

  In the absence of an external force, a moving obj0z:: ,dfpc (wt oql)x fa7vk 8wqk2oh*ect will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly de ;60+v(i1rgpjr i mgturned off, while traveling in em rep; d0ijr6+ gmgiv(1pty space, the starship will

  A rocket moves through empty space in a straight line with constant spelv4me +7 t5s azfq+7rced. It is far from the gravitational effect of any star or planet. Under these conditions, the force that murz7 t5cs v+7+e4la qmfst be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you sudde:pzpj8coty79zd -.g9 usv/ nznly fall forward. You can imply from this that the bus'ssgcpz9yj zn:z 9put-7 v/ o8.d

  You are standing in a movxp3t nht- y,c+kqwd4jd9 qh,7 -xgk vki3; lw6ing bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caus c6, -+d,nt 9y 3g7;w3jhkhw qi-x t4xqvkplkded you to fall forward?

  A constant net force actp*yf*af.y/+ vo1r l l9wt/4 fid lmn0rn x30pts on an object. Describe the motion of the object.

  The acceleration of an object is inversely proportdy*emyulkw6gl -m+g;p7z (;0 kf 1x usional to

  A net force F accelerates a mass m with an acceod+ei,w7x eia2sy9v .leration a. If the same net force is applied to mass 2m, then the acceleray,+iewxio.a9 sd2v e7 tion will be

  A net force F acts on a mass m l86j nnqgh/7o and produces an acceleration a. What acceleration results if a net force 2F acts on nh7 68gjqn/lo mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thixmqas)2 .f y6ugesc8 8s is an illustration o f28x).uqs6acs8eymg f

  Two cars collide head-on. At every moment ,ua18 qyc-g:bf6xtw ao ,-ug+ pxb/oaduring 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. This8wf -,:aabx, auuxo6gp q c/1-gotyb+ is an example of

  If you exert a force F on an object, the force which :94(x5ofyjeug k,qng7c xhl+the object exerts on you wiy7:q(g+xn,o cxlke4u 5jfh 9gll

  Action-reaction forcybae l5 m-a ;n:1xaqv+es

  Action-reaction force ibd/nn5.0 f-0u*c0e atnnbve s are

  A 20-ton truck collides with a 1500-lb car and causes a l5buz.k ufgc .idfng*41ee+ t 3ot of damage to the car. Since a lot ofugt.fci+nuged1 e *z f.k43b5 damage is done on the car

  An object of mass m sits on a flat table. The Earot2dv f64yx /rth pulls on this object with force mg, which we will call the 2 t ro6/fy4dvxaction force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth p8p slo1*nab+ qulls n o8*al sp1bq+downward on the toy 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 1500-N instantaneous force. Thex ,bv-z89zhuck2gx a *m hxz3/ ball hits the bat with an instantaneous force, whosmxazbxv9u zhzxc g 3*8h,k2/-e magnitude is

State Newton's three6a fgb,* me5kw laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon tha/k8e;v:lml-g5a1 ngfuw u 0sx n on Earth. Which of the following is true /5mvf :0;swk lauu ex1n-8 gglabout the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force obs):7atx9j 3j r/e3xkb:omong ky0 1which acts at a distance is

  Who has a greater weight to mass ratio, a p d/tvbzm 4-yhv4c+bj- erson weighing 400 N or a person weighing 600b4bjm/ +z4 h dv--vytc N?

  A stone is thrown straight up. At the top of its path, the net force actidn8kj 16fi+( ft*w( gllv*hj ing on it1nilh (+i* k*(6dlwtfvj8g jf is

  A 20-N weight and a 5.0-N weight are drof9,4xme o-hy onpi: y:pped simultaneously from the same height. Ignore air re:i-n, h9y op4xmo:f yesistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocities49mxwvy8g o) sw-bk ,q. Which )kmwq4, -swbx 8vog9yobject experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling o ur w+85 w33bbtaiu:orf an elevator. The elevator is moving up at constant speu8b+:5oibwwr3 ur3 t aed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevat.uwe.h7 :2c8 m,pphhfgd+ nmoor. The elevator is moving upward, but slowing down. What is the tens7.f puh ognhp deh.w+ m2:,m8cion in the string?

  The force that keeps you from sliu2 zouku +2)yqding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than ithcjp l1)fz4: x is to keep pushing it with constant velocity, becazh4 1) xlj:cpfuse

  A horizontal force accelerates af hl)nsr(o2( t box from rest across a horizontal surface (friction is present) at snl)(2rh (otf 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 bf8 wmd +4 .gvtn:.n69jnd2k wjkgak+ constant velocity. Thus we can dedu+ 92kwd4n8k.:+6bgfg jwnn.kjadt vmce that

  A block of mass M slides down 7xkz9l aehu1 r/v6val8o hd6,a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exer67r6 vl,eo z/huaka981x l dvhted by the plane on the block is

  A block of mass M slides down a frictionless plane inclp fz*f(zozg(h* xzc//ined at an angle q with the horizontal. The normal reaction(z(f oz fz/ *g*zc/phx force exerted by the plane on the block is directed

  A block of mass M slides down a fri/ix/ p(mlr mb;ctionless plane inclined at an angle q with the horizontal. The gravitap x(bm/m; /ilrtional force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneoud6 .ms)ahh:*vf pb)hlsly on an inclined plane that makes an sm*fv6.d h :bphl)ha)angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionlesv6e (ee a+xhfbd6,um 2s surface. A 16-N force is applied to the object, anh6+bfm (,xe ae 2u6edvd it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 imq: a0jdd ey.8;pfgsat .9w,9 cxou 2kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on ;0.ogw .pc9a ,sq :ed9fj xduay8tmi2the car?

  Starting from rest, a 4.0-kg body reaches a speed off g rwd(0,,ka9yuo t)o 8.0 m/s in 2.0 s. What is the net force acting on the bd0wt oa9g , f)yru,o(kody?

  An antitank weapon fires a 3.00-kg rocket which acquires xks uybv kff3t )dql -i,(78f:a speed of 50.0 m/s after travelin3 l7fsdy)f:8xkvufq(-t k i, bg
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 force that you ptng0c4nrfpvh fy31v 5:o 3d7pes : y3push a 10-kg mass from rep4 5y :0 rvdf v3eyhgs1npo:fn7 c3pt3st,

  What is the mass of a2/vzsuf1o yi3 person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the stkr )s -9r-sxwurface of the Earth where the acceleration due ss t-)x9rkr- wto gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the* y)t*0 uvn4x ig vre4qw:d/eee)9tw f Earth. What is the mass of the object on the surface of ther0ix4w)/q )eugenv*et* v4e9dtyfw : 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 weigr8)3r9d4bmalwpugovm0n p z5n f;a7, hs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses o,fpr 3vgu9ab)ano;zmw5 n8r d40mp7l f the objects.

  Sue and Sean are having a tug-of-war by pulling on opcq3 qm)kr2.lt)/k b7zr v/efd posite ends of a 5.0-kg rope. Sue pulls with a 15-N forceqr tfqklm/2b7 /c e.v3)dzk)r . 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 fricti(-0 ya n-b mx; g/ivo9sqs(ct zrv8k6ronless surface. A force F acts on the st(;oi6rn(kb0z ayqcvt8 g - vxsr/ -m9sack, and 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 480 N stands on a scale in an elevator. What will the scalip7-m(o6)gnws it glmvy5p6:e be reading when the elevator is acceler6 p:il-y)(gg 76wm snm tv5pioating downward at $4.00 \; m/s^2$?

  A person on a scale rides in)p-y(s)bzplk an elevator. If the mass of the person is 60.0 kg and the elevator acceleratkbs -ly)p) (pzes 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 elevatovg sf5sbml2h/ c j2f0(r. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration fhs2 sv(b/ 2gm5jl0 cfof $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One forcep in:)xm-ewpy6u -q jmi/ 9wv3 has a magnitude of 8.0 N and is directed due north. The second force toward thw-)3qmpe9: pxm- ynv iiwu/ j6e east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 k yecz9d 15*uan p5v1qpg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizonc zun51pdv5a1*y pqe9tal 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 the cab?

  An object of mass 6000 kg rests on the flatbed of a truck.kol n;,x16)iqu qang 3 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 loo1xn;qnliu,) k63 a gqad is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.yh)qzr 2y h/c61lp8 rs40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pullr / cyhl8sr q)6h1pzy2ey.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40a: d+ugyk rz5p79j ad/ kg, what is the tension in the string? (Ignore friction and /adjp9aukr5ygd+7 :z the mass of the pulley.)

  A student pulls a box of books on a smooth horizonu q(vue7.z 7ph 6b,hn5+ildkbtal floor with a force of 100 N in a diruuhzq vp b,ln7 h+7k(ibd5.6e 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 of books on a smo adebv:fxzq/3 00 ji*loth horizontal floor with a force of 100 N in a direction axe:jzf*l qb di/030vof 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+ju8.ecbk;o7- nhd t (7xja gj 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the ropes?chj8 -n7 djgo+jx7ke bu;ta(.

  In Fig. 4-2, if the tensi.: pu 2fagk*;t: hysxgtl;cy5ons in the ropes are 50 N, what is the mass of the traffic light; c .sl*x gp52thyg:k ftay:u;?

  Two boxes of masses m and 2m are in c xi7vxe0 cuuz/bdp 9 )1a.qbo3ontact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive box )ud9bbu.1x aeoq p730czxvi/?

  Two boxes of masses m and 2m are in coh9opr2ilwma9 al/z-g p e+v1bj0-q o.ntact with each other on a frictionless surface. (See Fig. 4-3.)0oi19lvqgj-eb/a opm l+awz 9rh p2-. What is the net force on the more massive box?

  Two boxes of masses m and g/x*m4sfz:o b 2m are connected by a rope. (See Fig. 4-4.) If the forward force obgmf4 *xzo:s/n the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See *+ : hgme1vuml8d:x:a xd6m beFig. 4-4.) If the forwm: 6*v gx :b+xdmaml1eh:d8 ueard force on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord runnprscn h ,z;6*ging over a pulley as shown in Fig. 4-5. Boxh,sr cz6*npg ; I 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 box thvhywh5-fi q61 7ua9 and a desk are 0.40 and 0.30, respectively. What is the nyaw1hu7tv-9 6qi f 5hhet force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic onp k cy5c1ed;d/ wood are 0.50 and 0.40,c;dcd/p ek5 y1
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 direct 8rx54(: jiao pkegl/sion. It slows and comes to a stop with a constaj(r/ 5 sxoe:8gil4 apknt 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 surokh/zv 0d8 ft *ne n)jfq28pw)face is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. W h82*q80wfdfe/ ok)zpjt v )nnhat is the acceleration of the object?

  A horizontal force of 5.0 N acceleratesn4 ick.ya +dd)b ;c+jz jow.u* 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 ancuu75ozkt1; os 87qaew.h sz: a+ae:i initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient oekuuo8 ;7+ei7a.1hwzca:5 :a sqtsoz f kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, p: eik ykyu1n15olice find skid marks 90.0 m long. They determine the coefficient of frictkyy u5e 11:nikion 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 Fig. 4-6.) The surface betweendoybz*(f:t) pf: puhh,q(*tt 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 friction force hq : po(*u(tft p) :,dfht*yzbon the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surfac zb0juxa3;sn wl-,i .me 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 nobx,0n3z lsju - m;awi.t slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless .cw*dy7 er.g 2gz9ektinclined plane. The plane is inclined at an angle 2k*.wce .7dzy e9rgtg of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle ofuwfe2b9n :,sg $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclined rxz)s2lj5 sawwz :i8z6j.xk3plane 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 avk;suu*i v5*mn 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 c1cuk(x9jth25o 1l 1 .l8x vayo;q hmvsonstant velocity of 6.0 m/co vu251(hxlhx.s ltky1;mq8 jo1 a9vs.
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 do4h)jnv vn2r 4nwn 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 d;;i4kw20n rt w(vqe ihown 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 surq zt5c w* pxe)u+jk+5lface. The cable attached to the log makes an ang c zpw)kl*j5+uxtq5e+le 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 anh(w )3p:rm1 ejg syzegk5e.6m efu,*jgle* e.jyg p(5f6: r)jh1sme,k3gzmuwe e 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 an inclined plane. The angle of incline is gradually iuni *e f0)me9wncreased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the objecf0 9e*) enuiwmt and the plane?