Which of Newton's laws best explae hu u (-pne-jjqt72)yins why motorists should buckle-up?

  When you sit on a chair, the resultant force on+n ) cd tdm(:cxuxam55 you is

  In the absence of an external force, a movin*gsz.qpen+ky4 c5.en ( tiqc 1g object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly ty 4 f 6 btw7ukb7+)napn8z5ycaurned off, while traveling iwk64)5nycuz af+ba bpn 77t8yn empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. It dl-4xog0 km8vis 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 sustao08vmd- lg4k xin its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall forward+ipxedtb3 4 k,. You can imply from this tha+txideb k p4,3t the bus's

  You are standing in a moving bus, facin)-8+aub p wwbpg forward, and you suddenly fall forward as the bus 8 uwawpp) b-+bcomes to an immediate stop. What force caused you to fall forward?

  A constant net force ac** 2zubt tbzd5ts on an object. Describe the motion of the object.

  The acceleration of an object is inversely proportional 0ruh:(smtq 4 oto

  A net force F accelerates a mass m with an accl ;fz,97tupzneleration a. If the same net force is applied to mass 2m, th fpuz;n, 97zlten the acceleration will be

  A net force F acts on a mass m and produces an acmb58qce04ss pceleration a. What acceleration results if abq m58p4 0escs net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. T t9gwk-w- ro z2) ygutgy)z1b6his is an illusgy )og-rwg)tzt-u y 169z2kwbtration of

  Two cars collide head-on. At every*.qeno 1c(xidq2yq4 t5ex pe2 vo67nm moment 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. This is an exampleepox(ny7vqt. 5x4n*o q d i2e1m2c6e q of

  If you exert a force F on an object, the force which the object exerts on yo y fjcr++v/fdqy6t/i1 u wilv cdyfr/+f 6tj1i/+qy l

  Action-reaction forc,k sq)rmu2lysqk ;(1 th*j1ow es

  Action-reaction forces ard,8kc n7sh401ojsg ya p:;x7n0vzkome

  A 20-ton truck collides with apy6/y9gzazm(- 0s + hup;hj zl 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the zzlm hj ;a+0gz6yh(yp-/ s9pucar

  An object of mass m sits on a flat table. The Earth +3hbzr) x )wqsj9ds c+pulls on this object with force mg, which we will call the action qh)sx d93cwrzs) +bj+force. What is the reaction force?

  A child's toy is suspended from t m ;y fzvcp0,)kt*uv/ymaa+k 1he ceiling 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," w;aam0+/vkv * kcft 1yzump),yhat is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous foh:xa q7m.j6ntx 3zdpo 4*rrm+n0cn,z rce. The ball hits the bat with an instantaneousmmj.t hn 3zzcxqn640 a7* +op d,xrrn: force, whose magnitude is

State Newton's three ,7kketsj ; (u+uml a8plaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. a-70ejtoi /yze m 5g6o Which of the following is true about the mass and weight oftgm7ji ao6/yo0ez5 e - an astronaut on the Moon's surface, compared to Earth?

  An example of a force sd20oon50lcm0cc- xu which acts at a distance is

  Who has a greater weight to mast h 2v jnoyj+p)665w,uqdzcl4b -ux *rs ratio, a person weighing 400 N or a person weigh b6+l652*x,noquw z dvrjy)h4pj-ctu ing 600 N?

  A stone is thrown straight up. At the top yb/:xi. cuso+p ez9f9of its path, the net force acting on i 9bfs+cp9 oxez iy.u/:t is

  A 20-N weight and a 5.0-N weight are dropu + g ;sl88cpz6rjbpa;ped simultaneously from the same height+ azgbju;;8 csr6l8pp. Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocities.fxuqlip bk 8w sx gv)+ :cra,88:ehn5hu,85b h Which object experieclw 5fh) vhq8b5hi ,x88a bkn8,usrp:+u: xgences the greater force of air friction?

  An object of mass m is hanging by a string fry* cav0q3 q)vtg +rbb/om the ceiling of an elevator. The elevat0q/+qb vvy3 gr*tb) acor is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. Tseuh+y niry1 *s .e4.xhe elevator is movy1unsxe*. i ysh+e4r .ing upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy skmfm7l.n;rn 4qi :p 4eidewalk is

  It's more difficult to start moving a heavy+vuy(b,+ )w /aw:o.wxej a q: zspn;ws carton from rest than it is to keep pushing it with constant velocity, be jbzwqs;xvy+e.wuw :,na(:poaw+)s/ cause

  A horizontal force accelerates a box from rest acro * wjm.+/sss p2firo+css a 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 dou* + sf.s+opw rs2mc/jibled. What happens to the box's acceleration?

  A packing crate slides down an incliw 4(f7r2602 ivzkoif n0:h t depg;fxnc:-eghned ramp at constant velocity. Thus we can dedi60;trg z fce7fxo02n(2h4:p nf-vdhwgki :euce that

  A block of mass M slides down a frictii-tm doeu+u;7onless plane inclined at an angle q with the -ut7 io+um; edhorizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down t /aiae +ulde1l 3lchun*; 3*ta frictionless plane inclined at an angle q with the horizontal. The normal*1a 3ln iae etuh /t;d3cll*u+ 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 q withya+ h 6d:xumihr* tzdx9ny.0. the u.r :+*d0m .h x6iz9ydyahtnxhorizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inruru7d1r*vqw9uh g :)clined plane that makes an angle of 30e with the horizonhvwduru9r7*1)rq gu: tal. Make a statement which best describes their acceleration after being released.

  An object sits on a friction6,.p r r9.w6 nuwqgbajh5 s5.igb crz3less surface. A 16-N force is applied to the object, and it acceler q5..35rgzis ahc9j,np 6uwgr b.w 6brates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg canj8e7vk1mxx urm,*o59g lv-n)v g q.rk accelerate from rest to 27 m/s in 7.0 s. What is exmjm7qlg8nvr.vgo1xku- v*)59rk , the average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Wha88 ft 3kk;qlilt is the net fotklq3; l8 fik8rce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquirm 2 cc4csp :y/ol- ue2k5zho(ces a speed of 50.0 m/s after travehlso5 e ocp( :c2ykuz m-4c2c/ling
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 push a 10-kg mas8.abk0owe eqt (3(wpjs from resk8eotbaq( .e jpw3(w0t,

  What is the mass of a person who *yp ;5 gdtxfq4weighs 110 lb?

  What is the mass of an object that werf2o05 :0swuun/enozw u48cgighs 250 N on the surface of the Earth where the acceleration due to gravity cu urou/e ng5 s0 4:0zownfw28is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on tbrmr37oiv9dxmc dq b2b6 4)r225vhp f he Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is on r7m bifpvdrbv93m22 )ro25 bh6d4qxcly 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. Thed5q p*6b:xf( ve,hxzx Moon's gravity is one sixth of Earth's. Comparq *h, 5(p6bfxvxxz:dee the masses of the objects.

  Sue and Sean are having a tug-9fys-n7ikiie6j r e5n r 6h35fg.cr1r k/ t/isof-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 accele.ni7 5rir5i1rhe6efsgy kcsj 3f t 6n-/k9/i rrates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on z2ymi8crc//x :owjm8a level frictionless surface. A force F acts on the stack, awi /:m crj2czy8x8om/nd 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 scalxn u(bcu:a/l/6q .t l1tqbai 7e in an elevator. What will the scale be .utb:6( /bicnq/ axluta 71lqreading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevatxcbl1x4t1v d0 vdk8 l7or. If the mass of the person is 60.0 kg and the e7 lv 0dv4bxdt181xclklevator 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 elevator. If the mass of the person is 606ry(;u w)f jferx f1o6.0 kg and the elevatorfr(;u eyrfo66x1jfw) accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces9- ba1szs rn2u act on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second s1r-saz 9nbu2 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 flatbed of a tlq .onox+xk kv:+ii 5m ve:x41ruck. 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 tx+qv+xo:ki l4 1xe kv .:im5onhe load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is heldby/5j qm0 s;j+jlr*svktes+q 25l-mg 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 not t0 ++bt sjqmke-lyjls*g rs/v5 2mjq5;o slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg ang;tcxa,/vhpo *) ;kzod m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignorho ,* p)k vx/;acoz;gte friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, whab9feu02ddyd+i j;3v y)ze t (ut is the tension in the string? +dduy zi b9f)dy j e3v0(;eut2(Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal fuz;j: gd 7ld6uloor with a force of 100 N in a d6ud: d7zgl ;juirection 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 o)bp:lyr w, hc5k+u1u ub3f/gsf 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 /psgc)u3 1:, u fl5yhbbruk+wbox and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is/mfoy 0)/( qhhflf+c cpudut:o3+wn9 supported by two ropes as shown in Fig. 4-2. What are the tensions in t+ tu(9nucy3: /o/hfd hf+m)pqcfo0lwhe ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass o:qng(ag hs7 o)f the traffic ( a)7ggsh:oqn light?

  Two boxes of masses m and 2m are in contact with each other on a frictio.ji;5 nvwrnwjd z .u67nless surface. (See Fig. 4-3.) What is.ijwvn7zn .d;u56j rw the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on k1zto8 (km4y9rz/xip a frictionless surface. (See Fig. 4-3.) What is the net force on the more massym/4r1k(9oz 8tpzxik ive box?

  Two boxes of masses m and 2m are connected by a rope. (See*b.vdr /ygq(ymvm+)o Fig. 4-4.) If the forwardq)v m/od.bv*mgy r+y( force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m anb8 ihmn i:r)ke9 z8(dxd 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 less massive bod9z8e:h kb8mrn)xi i(x?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. Bskc ;:)mbqq ny nr6)2mqsr nm2k ))myqbc;:6n ox 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 /,q h(bm0sx :i 2unqjt3.0-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 force is applied to bsi:0j(,qhqm t/x2nu the box?

  The coefficients of static and kinetic frictions fo0oj x7 r;9 +jxdl h5jvb:u-vhqr plastic on wood are 0.50 anh:5q9b j-7xr0 dxu+ lovj hv;jd 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. fv5dctn i7,d xe-4: 4cmh6bc oIt slows and comes to a stop with a constant acceleration of h 7edo: ,dn- 4cc itmxcf6v4b5-$2.45 \; m/s^2$. 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 a 5.0-Nh:nf8cvlji+n+9 ce: 8 jvfz -e force. A 3.0-N friv:v+c9n j-e8:zc n+e ijfh8fl ction force retards the motion. What is the acceleration of the object?

  A horizontal force ofsmrs wg9, drkhtqo(34d -2d)mcel0b; 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 gp otcrz 2)j4h i2t0y7oqj/9sgl 1cvl /iven an initial speed of 10 m/s. It slides 50 m on t94yroqjp/tc2 iv1c /zoj20ht)g l7slhe ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 m p(cs2l:4 38seg zc x.,aaeimalong. 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 the car when the bramcze,pi2 8 ca ls.:xges4a(3akes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.)we7u2nqdck ) 1o 6bf2v 3oac r9t7:psi The surface between the more massive box and th3 2dar16ute2wcb 77visckfoo9qp :n)e 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 on the less massive box?

  Two boxes of masses m and 3ij2gp +za5kh /m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxz /5ih+kgpa j2es 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 lo rx0 noevbl*41.e6aplane. The plane is inclined at an angle of lr . olx4oe1bnv6a*e0 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a yo;w8;o-toz n(z 4t uxflat 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 plan *,srk-amo i0ye 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 smor* 2uq1+x(5g5umaaf gsmr4 ac oth inclined 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 plane, at a const 7n1(rya cac/jant velocity of 6.0 m/sac7(r/ ya1 njc.
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 lj (z4*qa+ 93 oowpmym6 odjf9down 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 dow g5k.m weh-ge1n 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 roughso+ 8hppe) i(b surface. The cable attached to the log makes an angle osio+8h) bp(pe f $30.0^{\circ}$ 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 p-b f b1vkv(i*hlane tilted at an angle of -fb1 (hvbikv* $33.5^{\circ}$ 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 .ms:jns 3orto:;txx 0npvs+*angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What ipsv:xj r3:. om ;stton+0s*n xs the coefficient of static friction between the object and the plane?