Which of Newton's lawsw/vm vf+j4jbk/.i-th best explains why motorists should buckle-up?

  When you sit on a chair,8jo(w:eg(p ad 8tzr7 c the resultant force on you is

  In the absence of an ext q3 no3p l(ng7m+rlhlft(kv-; ernal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAxr.s *g-xrpdu4/g /-rv clry:IN are suddenly turned off, while traveling in empty space, the st./d4:lr rxspgry--c u*x/ g vrarship will

  A rocket moves through empty space in a straight line with constant speec0av(f 1pyp*s d. 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 motion fs ac (0y*pp1vis

  You are standing in a moving b/esqp mo ve-8 ;x(lmw-us, facing forward, and you suddenly fall forward. You can imply from this that xm-(e-pv o 8lews;q/mthe bus's

  You are standing in a moving bus, facing forward, and you suda8b+tmv53o rmpm. e8g vn5. ogdenly fall forward as the bus comes to an immediate stop. What foramm .or8v.5pg bn8o+m3gt e5vce caused you to fall forward?

  A constant net force acts on an objc ia30t6va(-nhb g z1pect. Describe the motion of the object.

  The acceleration of an object isa.c1q4u rb4vp oh)be / inversely proportional to

  A net force F accelerates a mass m wit62vzph mcgeuw/ -06ez h an acceleration a. If the same net force is applied to mass 2 mepzuz6cv0 e w/g-h62m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acceleratiy)g-9ascs r;c gv/q .5b la4sbon results if a net force 2F brqb9s.)4s cyl;5vsc a ag -g/acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly awaiux /uoe)-ti: y. This is an illustrationi/: )eot- uxiu of

  Two cars collide head-p2r6wwh( u ny8on. At every moment during the collision, the magnitude of the force the firstw2( wpny uh86r 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 the object exerts onka5eecrsxu ;8z +saco5d0o o4.co7.w you wia+.;5cr ss 8xc wcoedo k.40oea75o zull

  Action-reaction forcef5qdzd6/caf .z jn06 is

  Action-reaction forcesl-1fwkbc3p j5 are

  A 20-ton truck collidevsiq3g57ajkroaaq; s) (4;an ,fjy-zs with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the cn; qa)i4g,-(s fa r sak5jvao;3q zy7jar

  An object of mass m )w 9mwj )xiqc3mov q0l;7ohfvv8vu2: sits on a flat table. The Earth pulls on this object with force mg, whichjw :2ohuvwq ; fov0lv 7m)3x)vmqi 8c9 we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceildi :exogyq 6d4 (l+ig5ing by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is th qiyl4e+i6 ggxodd(:5e "reaction force"?

  Your bat hits the ball pitched8ij:5w 1me3kydmo5vpuu+ fzdm: 8t z, to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is o:kumf mi5t3w 1ue z:d+5y,pdj88zmv

State Newton's three lai7 tkb0i+j qj 17fr,raws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth.f o4mkimns (wqd.a11) Which of the following is tr11 qso a()ni.mwmk4f due about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance:erekz6fr0vo) 4l,n)pc x c .t is

  Who has a greater weight to mass r*ya(1z *m wfjhnvp7 l6atio, a person weighing 400 N or a person weighing 60l 1n*6fy zwv h7(j*map0 N?

  A stone is thrown straight up. At the top of its path, the net force acti dkz;-s2oait.ng on it zo2dsk;t .i-ais

  A 20-N weight and a 5.0-N weight are dropped simultaneously frthw98 :)elbdmpkl fw7( 4idosk6 ge6 ;om the same height. Ignore air resistance. Co9timfelhp;b w8lw4ded:)(g 6kos6 7 k mpare their accelerations.

  A brick and a feather fall to the earth at their respective termin ns fp(1+ cnel4jae )6*v mga-opidn.1al velocities. Which pcoe (gf1aa 14m+)n6dsvji n ne.pl-* object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. Th, 8ewhjis*y,60v:f s-yvmt 6hf l*bwf e elevator is moving up at constant speed. What is the tension in vtf* yf0em ji*v- hbs6swlh68w f,:,ythe string?

  An object of mass m is hanging byh5ejqbj k5dvz2 *8l4r a string from the ceiling of an elevator. The elevator is moving upward,zh2bqk *l e4j8d55jv r but slowing down. What is the tension in the string?

  The force that keeps.wl (az5z r0sw 8oeh5b you from sliding on an icy sidewalk is

  It's more difficult to start movicd l : 2f y.3)ysnx4lv6q4- qcnbi9swdzl1o*ung a heavy carton from rest than it is to keep pushing it with constant velocity, becausel l.6cfvyq zdn4s- 2n i1subx*oq9dc4wl): 3y

  A horizontal force accelerates a xcg-x/mbvq e64;urf(:* hci ybox from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that tq4x:i f mgyeu-crc (*xh v/b6;he horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constanuj-fszb*0b- w mk-jpso2un4 ,t velocity. Thus we can m*jsu-,uo s b0nkz w4-bf2pj-deduce that

  A block of mass M slides down )q2al z)+ajp/atl7fi a frictionless plane inclined at an angle q with the horizontal. The normal reaction force/l2q zfa))jil pa t7+a exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at amgo )g2),jq48yrqk l on angle q with the horizontal. Thj, 2o4rlqg)k oq8m )gye 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 angle xw3h-ivu x5r.stoq) 2*zav , fq with the horizontal. The gravitational force is directest,or.vv-2ihuxzxwqf*5) 3 ad

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an incline dnbc)or1 )z5/wxgb z;d plane that makes an angle of 30e with the horizontal. Make a statement which best describes the;c brxgnb )/5)woz1d zir acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appligf +0pqc io8h8ed to the object, and i8coihpfq 0 +8gt 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 to 27 mu,*xc 6g3fkki /s in 7.0 s. What is the average forward force on,*3gcf k 6uxki the car?

  Starting from rest, a 4.0-kg body reaches a speed rjt,d6 q)jeekc i,90v9mdt b5of 8.0 m/s in 2.0 s. What is the net foc,rt d9 q6m9)jtk5id0vbj,e erce acting on the body?

  An antitank weapon fires a 3.00-kg rocket6lq9svx( z vdra79 c o+yjzp-( which acquires a speed of 50.0 m/s after trav7 j (ocl69rdqpa+x-(y9z vzsveling
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 witzw uj96;ei*k(zair o6h the same force that you push a 10-kg mass from rest,6ae zi rik9o6z(u*;jw

  What is the mass of a person who weighs 11owl6.sk 0ge.ff: / ajx0 lb?

  What is the mass of an object that weighs 250d gp-a1buc,)thks ;) c N on the surface of the Earth where the acceleration due);g-ct,d shkba c1u)p to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth.wm)k+a -l5jw5)qcn gc What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the )5)wn ga-k lqccmwj +5Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Mooct sv jul38d80n. The Moon's gravity is one sixth of Earth's. 8tvduc 03lsj8Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kjhc c+.,,1ofax37qc9dv*gmsv yntc 5kb/ z2 ig rope. Sue pulls with a 15-N force. What is Sean's force if the rope acz d*f +jg sn.27hc/cm 5btiv3x,ok91cqy,v accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a lev*p9zgba30c v kel frictionless surface. A force F acts on the stack, and it accelerates at a*cbk pzg0v39 $3.0 \; m/s^2$. 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 ono(htlop;w( to,ec zha2u177 z a scale in an elevator. What will the scale e tho12a(wl o7o;zzpu,t ( h7cbe reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of tho+3b-pc-t en ye person is 60.0 kg and the elevator accelerates downward with an ay 3-on+cbt -epcceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator.aqs-(:,n xsu/kfjg d xx4t9: jx y;r6j If the mass of the person is 60.0 kg and xj: xj ,9nkua:txrs 6yx;q-(/ 4 jgsfdthe 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 mass. One force uk0vlw(37 gjh 1mar8,7t tycjhas a magnitude of 8.0 N and is directed due north. The second force toward the east l38j,kja7 twyh(107tgm uvcrhas a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 600h* s/uff7/du s0 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exertf udh7sus /f*/ 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 into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in pl0wi 17)q)pm ghyqz3kjze j*u 7ace by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is trm)kjq0u1yh *gzw e)37 zjqi7p aveling 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. (+hw8 ujy: 3z;z povba4uh j.s4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and theo 3jjh+ p;:8vuw( z bhz.ua4sy mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg aq9gg t8efhi./)* bd* 4fisgjw nd m = 0.40 kg, what is the tension in thed* g ftgsbiq8.hei4w)* j9gf/ string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smoott4t6x qhn8xophaf,/-m(lks 4 1 8tcxyh horizontal floor with a force of 100 N in 4/ftpy (8khq,6ttx4chm8saxx1on l -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 horizon 68ww i-lbm/prtal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box anp 8wl/r-i 6wbmd the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. 4-2 7rdoc)mh /si gjy5 k*jnp:lps(83xo3. What are the tensions in the ropegno)s xl3 y5cp(phs8/* i3ordmjk7: js?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the tra5lhr t(tb5*ff,ymvytv *ehr7m( h 27effic ligh(*rb5t2,*yf (m5he rt vhmef7hytl v7t?

  Two boxes of masses m and 2m are in contact with j*knd l: m )q l*9*kcpat*w0aeeach other on a frictionless sur*cmpad e*aq j0kwnl ) tk:9*l*face. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each osevsyle..o *7ther on a frictionless surface. (See Fig. se.e y7s.v* ol4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4- r0( x1ssme0rx4.) If the forward force on the more massive box is F, what is the tensio0m(xsxr 0ers1n in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (Shihnm t(pj4sia: /,2ree Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less m(,t:im2a jhp r /sn4hiassive box?

Two boxes are connected by a cord running over a pulley ne7imq3b2 h+h n/ 6iimas shown in Fig. 4-5. Box I2hh6m/3+ n7eiqibnim 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 st.g e1n8tvxuig 0 0e ;jrejyd65atic and kinetic frictions 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 horizontal f0eied.86 vjrjn5t1ge;u x0y gorce is applied to the box?

  The coefficients of static and kwd43a /p -avrkinetic frictions for plastic on wood are 0.50 and 0./p-34ar vk adw40,
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 co/ bf3lcy;+sr xjoxda6 nn4bc 4)fdu .:mes to a stf. ;o )nx6xfbj ylnau4/ csrc:+b4d3dop 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 pulleoqer e b,n:/0ncd1r/n-n4mw id by a 5.0-N force. A 3.0-N friction force retards the motion. What is the accelera:n qw-,01n ne/4ed riob/cnrmtion of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rbrm2mk)o 079e hk ga6oest, 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 mga cxj- aa907k/s. It slides 50 m on the ice before it stops. What is the coefficxkj90 - aacga7ient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, poli2)5ju3cymfw/d+ tub ice find skid marks 90.0 m long. They determine the coefficient of friction between the car's tirew f/+)u3jy 5b2tcimud s 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 betw/boxzx42adt06-tr 8e0( a yx wieom/+ugdnp.een the more massive box and the horizontax o(8d u4y6g-r+p0n et/b /zd ieox.atm02wxal 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 on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface between +7 /e6q;tc tjadkxlz(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 +cq( 7; txtl6ek/djza, what is the coefficient of static friction between the boxes?

  An object is on a frictnl1,g- fh)lus,y-yp .tl: z tnionless inclined plane. The plane is inclined at an angle of -:gh ,l- nyftl,up1tsln.y z) $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes qjj w+6*9nzwk 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 a,sbn1oy l-d6wngle 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 incnvm r djb1gv1(es7m9b6;c4u a lined 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 directly down an inclined v);jly: kx::l7wqg si plane, at a constant velocity of ) s ::vkxiywl7: gjql;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 do*(2uzhm hy /da0zd m bnpy:q+6wn 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 sl(om.x:9idk zh2b iy8 lides down 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 sm8e-z2amqwq5m / -vglog weighing 500 N along a rough surface. The cable attached to the log ma qze/ g-am8vs2m qm-5wkes 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 a rough inclined plal)itpi9z)05 n orfv 2bne tilted at an angle of )ivfri2n0 p9tol bz5) $33.5^{\circ}$ 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 pl 0wzp)w+bj(wl ane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficzjp0w)bw+w(l ient of static friction between the object and the plane?