Which of Newton's laws best explains why m* i3uhf7m (:k(bg dftdotorists should buckle-up?

  When you sit on a chair, the resultaf:afqbn0 nx 10lsx (sdet*9 )t.b 4ugdnt force on you is

  In the absence of an external force, a moving object wiliyh(yj3*qzj 83tk84wi -uswrl

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sudden2 +vgqnyc:y27 eqj8y rlc1r5dly turned off, while traveling in empty space, the stan2dcj5r7y 2lqqgvy: re 1 +y8crship will

  A rocket moves through empty space in a straight line with constant speed. 05o pj r3 d: 7st:alebgem+ut5 It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be appliedg7:s3+aebud te0r5m:o jl 5p t to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fa.gr.eq8lz1 4:(/ wpzn6/b4q mn zpbthn:ajeo ll forward. bt8 noe 1.p6:4wgq:elnhnqj z/ab. pzrm( 4z/You can imply from this that the bus's

  You are standing in a moving bn*tvj .kuuz6l) j )n:aj;yn;)oiw q ,uus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. W;k uu)l6wiznq tv)a.;,jj)oy:* n nujhat force caused you to fall forward?

  A constant net force acts on an object. Describe the motion opfyc0:/r t4b/k vjxr/ f the object.

  The acceleration of an object isxmnm 3g xvx1ra8r0hfb 5rl;e/w9/o:/tag o:l inversely proportional to

  A net force F accelerates a mass m with an acceleration 86by ft)17vdjrroec2 y 3xmzio,c)c*a. If the same net force is applie1xmeft7y)o 3 rob* 2cijzcc)v6rdy8,d to mass 2m, then the acceleration will be

  A net force F acts on a mass m and producem +gi-4lflae 5+ul bp)s an acceleration a. What acceleration results if a net force 5)4lg-+milua+ felpb 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the b6y) znrz69t; ucca9 zwlgo36calloon will fly away. This is an illustra z9;wa9 cur36 l c6t6zgyncoz)tion of

  Two cars collide head-on. At every moment during the collisx -w w,hb.p;lezg,;s qion, the magnitude of the force the first car exerts on-esw; , w.p,xlbhq;zg 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 objec65w ) qwyev3yht, the force which the object exerts on you wiv5wwhq) 36ye yll

  Action-reaction forcer 3v0 l ;pn nz8y1lgiw648avlcs

  Action-reaction forces arebh/b 49p onol+d4/vzz

  A 20-ton truck collides with a 15066yt14fr q1es ow9q .xe9mfgz0-lb car and causes a lot of damage to the car. Since asef 1yxme9q 19grf4 6q.t 6owz lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object with a z +s v:qvj6qn9y4t1pforce mg, which we wil9q6vq sj+ay v4:pz1ntl call the action force. What is the reaction force?

  A child's toy is suspenkyw)7q/nrrdy.4 . owo ded from the ceiling by means of a string. The Earth pulls downward on the toy with its wei4/ w.dw.nkrq7yyo r )oght 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 forceczw7k i7df/k fc9 e8g5lbj g;x6e6/y e. The ball hits the 9/ xkg /e5gbykfl7ez7wf6 ;idc86c ej bat with an instantaneous force, whose magnitude is

State Newton's three lad ok 5yxb2d8)gws.

  Mass and weight

  The acceleration duesh , 5zvx/e9ulqq.f.b to gravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?us/ 9fl,..zvh5q bxeq

  An example of a force which acts at a dcek z*bl 0z t1o6hn)10aq2stj istance is

  Who has a greater weight to mass ratio, a per krrfi7g()x 0wy sj .l(m/ev/8p ef5ljson weighing 400 N or a person weigg7jv0w.ef rlliy/ krf m j p5(/8()sxehing 600 N?

  A stone is thrown straight up. Aqvfx8s*nu :4 et the top of its path, the net force acting on it8x ue*:s 4qvnf is

  A 20-N weight and a 5.0-N weight are droppe/i snib) 1/ u9czjgvtjdp /v y,l1t6z*d simultaneously from the same height. Ignore air resistancev*j/ tc zg j, td1/)19ziinvbupy/sl 6. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal veloc/u:l6cu q 5ooeities. Which object experiences65qoeouu/ cl: the greater force of air friction?

  An object of mass m is hanging by a string from the c/r)58s5rp 5ylxs-djg4+fpy.l lj ixkeiling of an elevator. The elevator is moving u-y yrpxjlli5rj+s)8lkgfd/ p s455.x p at constant speed. What is the tension in the string?

  An object of mass m is hanging by ,b+nqj+ t9iskkla m1- a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the stringk,t1k-9+ jasmqn ib+l ?

  The force that keeps you from sliding on an icy sinh23jeo pr0o)dewalk is

  It's more difficult to start moving a heavy carton 7z(swv+v tae)decn0 wn8 (k4 hfrom rest than it is to keep pushing it with constantade 4w (+zwev8)t( v hn7kcsn0 velocity, because

  A horizontal force accelerates a box from rest across a horizontal surf(6sg m ye9/qv4ssrf i7ace (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 happens to the box's acceleration? ssi/9 mvrg4y(efq6s 7

  A packing crate slides down an inclined ramp at constant velocity. Th2m2ez 5dg.or8ueg;ws( qb e +mus we can deduce ouegqgz+ emmr2s2;(bw 8.de 5that

  A block of mass M slides down a frictionless plane inclined at any+0 t .*qkkw oy.mnjjrvtf4:- angle q with the horizontal. The fq0 mjkk*o+.y-j.twtyv:r4n normal reaction force exerted by the plane on the block is

  A block of mass M slidiag smt ll+0ap*g55l7es down a frictionless plane inclined at an angle q with the horizontal. il0p a+lgag5ltm5s *7The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angsl+b xi.e i5lridi:;.f +b/bwle q with the horizontal. The gravitational forcxis i+fbe:r ;l.b.bw/ 5dil+ ie is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously 70fd1wr jv5ok5n 31bh c2i ln fvhs*9hon an inclined plane that makes an angle of oc2n 01hn1fls*95jw vhfikr 3dhb5v7 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N forh+r1nc8 vl7gsqa c 06ece is applied to the object, cqg61n h a0s+ e7cvr8land 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 tom+v v/dp pz33o i7te,hw;m,ht 27 m/s in 7.0 s. What is the average forward force on tp7, pz33 mhdh,mt+ev i/ov;wthe car?

  Starting from rest, a 4.0-kg bodetknf o6/vzv 7, 1*qjpk/ 5oszy reaches a speed of 8.0 m/s in 2.0 s. What is the net for6,*spk //o7q5oezjz1kt f vv nce acting on the body?

  An antitank weapon fires a dd g,zs9prt obuzq8 ;188sy j.3.00-kg rocket which acquires a speed of 50.0 m/s aft o ,z8;z srs8ydudp8 qg9t1jb.er 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 ma jp7 m.tfw+;6;ao(eayiz0yrq a3 x:kfss with the same force that you push a 10-kg mass from rest.mj a6o :a0xyetqki wa3( f ;zf+pr7;y,

  What is the mass of a perso+,zfylt1bz c 8i+*c okn who weighs 110 lb?

  What is the mass of an object that weighs 250 N on tsxu0u+cf/ xn 7he surface of the Earth where the accelerationxu/c nf0 u+s7x due to gravity is $9.80 \; m/s^2$?

  An object has a mass ofu* 8d34rwfrgw 60 kg on the Earth. What is the mass of the object on the 3g wf wru4r*d8surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Ea gq0re7;jv wut9+,rvy rth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objects.q evgtjwrr7,+09u;yv

  Sue and Sean are hav)nta skbc) z*.ing a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelzkca))ns.* tb erates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frhok,c b+.r wln*es52sictionless surface. A force F acts on the stack, and it accelerate,.*sw2 kbrso5c n+el hs 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 ail +d gqhcfcd(t/q *x o2m81-an elevator. What will the scale be reading w2 1-dhai+/ l gq(tc*mfx 8ocqdhen the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale r.-v+ms x fcw fv:sis+6au7if)ides in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with aniaf s)m u-s76icx+fw+ . vfs:v 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 the person is 60.0;2;.i grq f l09uv eyl6bqk.og kg 6 vl9 l.r u e.ggibq;20yfo;qkand 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-kg ma47ds2sqj gph tb/h+ 8kuh5 ot(ss. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleratib4ghh uq htt (spk+/s7 8d5jo2on of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in6eievc ev3-n j,68auz 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 distuj3, e- vie6nac6 zev8ance 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 is held in*ujj n7n4yyn3 place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, whatun n jyn3*74yj 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 and m = 0.4 p0vy a;n,oos.0 kg, what is the magnitude oov ;on apsy.,0f 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 ma ex7ed/e qa5 6lh06im = 0.40 kg, what is the tension in the string? (Ignore friction6ix qe5a0h6eald /7me and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floortcncj8qkcb+/ft8m5+ grg1l/ with a force of 100 N in a dirq5tg+ktn/+jrflg mcc 8 bc8 1/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 smooth horizontal floor with a force of auuzg3x5 mto :h +8c0c100 N in a direction of 37.0e above the horizucz+ xg3u0 8thma:oc 5ontal. 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 suppo68* q4q,o:szhntxaj (e gvj. nrted by two ropes as shown in Fig. 4-2. What aentgs.o4*xz:6 jj, avhqnq 8( re the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropeuzi0/am, e q9js are 50 N, what is the mass of the traffic ligh 9q0zu/j, aemit?

  Two boxes of masses m and 2m are in contq7:x 4+f9k z:vmxlcre9bx nk+ act with each other on a frictionless surface. (See lm9v+x n 9xcfbx7q+:k 4ekz :rFig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m andrh5z-t: 4cpobp2tby1xah)) 6 p, clte 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.hphpoba 51 l6cte)r),b-24 ztcpyx:t ) What is the net force on the more massive box?

  Two boxes of masses m andbxwqq7.f v)zpvz3zl4te 1 jqmj +l 257 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting 7q7e4pftvzjq5mxlb qjl 23zw.z1)v+rope?

  Two boxes of masses m and 2m are connected by a rope;im9g1hdzxb(wjo,+4 l oh,h i. (See Fig. 4-4.) If the forwardoi+w1 gbmz;h h94 hdiol,(,jx force 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 aggh qtm*flld15. 092kapx7l) p+e yok pulley as shown in Fig. 4-5. Box I of maslt*9pl 7 2)mqe 1hoy0klxkf 5.+dgp gas
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 dew30pcgiv pv7n/+k-s xsk are 0.40 and 0.30, respectively. What is the net forcegv/ s7+ikwvp0-3 cnx p on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for pl h6wmnil492qng2r x pu;5z9ik astic on wood are 0.50 and49z uwg2 qniir62 nxk5l h;9mp 0.40,
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 the +x direction. It slows and come m0hc atr.dfmtlt(+ -h2i4cu6s to a stop with a constant accelera+.udm2itf cc-0a(t rhm tl4h6tion 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 acozhyfs 1)z b0 )3q/an 5.0-N force. A 3.0-N friction force retards the motion. What is t )10yznbqo)czh/3 fsahe acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rate n /7wrf ,5xx+seu;s /l brq*arof $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initial speed of 19li3sk mvut787i/gv g 0 m/s. It slides 50 m on the ice before it stops. What is the8s i 9l/vm7ug7igkvt3 coefficient of kinetic friction between the puck and the ice?

  During the investigation of a,c g 09;* (tzuncrg3:vbvb: 0sdclcui traffic accident, police find 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 zvns*r(3 cg cc:gu u;bdct0 lv,ib9 0:the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) Tx xs )6v7cna4b4oj64 hj,b(yxojen3wtsb:c8 he 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 iss s6nxcbwyv ,njj b7x4je4( )3:4h co86xtaob the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The sul c4/ws+7-ljmx q;r darface 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 +wr7c;al- m 4q/xjds lthe coefficient of static friction between the boxes?

  An object is on a frictionless inclin3qfz*) 7wnql kte1 dd4u0s.ened plane. The plane is inclined at an angle edfq0snw.7 n4ke1)zld3uq* t of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a m iwi: 7ct.f3oxus+, 3p nhh4d67lghjflat 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 pl7 cqxb.n,qvr(ane 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 2;s)vnmi v:t;tc v n 9:nx-ppatilted 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 inaj: d) ) i6b kl93x:ekg8gdrloclined plane, at a constant velocity of 6.0 jglk)ox9re)3::adk6gd 8 i lbm/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 d0v*qx jp7p 7) xgvau2rown 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 dourvu ;j.ee) bqe h6hpz)m :,n6wn 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. -n 2eukh4c3jdThe cable attached to the log makes an angle k d4h3c2njeu- 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 re4j7es/ la 3jtlkmzl)q5we5 *bst on a rough inclined plane tilted at an angle l/43bt57aej*lkq) z m5e ls jwof $33.5^{\circ}$ 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 yn3 : my5d+,zk*xehab gradually increased until the object begins to slide. The angle 3 nymbdxz5k*e ya:h+,at which this occurs is q. What is the coefficient of static friction between the object and the plane?