WB_Solution_Ch04

WB_Solution_Ch04 - Force and Motion 4.1 Force 1. Two or...

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Unformatted text preview: Force and Motion 4.1 Force 1. Two or more forces are shown on the objects below. Draw and label the not force Fm. go‘ 2. Two or more forces are shown on the objects below. Draw and label the net force filer 4.2 A Short Catalog of Forces 4.3 Identifying Forces Exercises 3—8: Rullow the six-step procedure of Tactics Box 4.2 to identify and name all the forces acting on the object. 3. An elevator suspended by a cable is descending at constant velocity. 1. SWM‘. Quh‘h’f“ 2.. TK‘Q‘ S- Cmbld‘ «at A Enotronmc-di (“5“ ' ‘ a 3min?!)er 4-3. 5, U) fical'd’ :1 4-1 4-2 CHAPTER 4 - Force and Motion- 4. A car on a very slippery icy road is sliding headfirst into a snowbank. where it gently comes to rest with no one injured. (Question: What does “very slippery" imply?) L 2 Car— 3' a" EVIVIFDflmfl'l'; {ROOJZ} SnoQLfia-«LL S.Tk¢ Sum-JEAth o.an P0049 A tk‘w QO-cln agar? {nor-MAL firm,- n; K! ’5 Lt- fl ‘ I.) _5 road 6. wetfiut- (,3 w 5' A Compressed spring is pushing a block across a rough horizontal table, l. QYS‘HMW giant? 2. 3 ,imv‘monma+1 9FP103:+0\'O\Q_ \ F J g, Srf'uwa L}:th SP. [8” a J i L\ - a} k- Cf‘mtsh Quits norm :24. LL F5? OJNQ kib‘lfhg ‘gflc'hon ¥t & G. Wu}, Kt 3 6. A brick is falling from the roof of a three—story building. 1. syskmflsrick '2 gflu‘mnmm «M C] *3 r .3 '1". Blocks A and B are connected by a string passing over a pulley. Block B is falling and dragging block A across a frictionless table. Let block A be “the system” for analysis. $({S‘i"€m‘.glack f 9 when “Mtflfrrublbl a gift-05. . a) *' k a T051 exec-“1's “carnal Era—R. S‘firlha 3K3“ hflswflT 8. A rocket is launched at a 30° angle. Air resistance is not negligible. : lcc‘i‘ . “J 375W (2“ (prams-D E amt-o V‘ M03“- P" 5 exhaust- wfitalfli‘ ‘33 rhs'i‘ fi-HA r'mt‘Si~ CHAPTER 4 4-3 Force and Motion - 4.4 What Do Forces Do? A Virtual Experiment 9. The figure shows an acceleration-versus-loree graph 10. ll. for an object of mass m. Data have been plotted as individual points. and a line has been drawn through the points. Draw and label. directly on the figure, the acceleration-versus- force graphs for objects of mass b. 0.5m Use triangles A to show four points for the object of mass 2m, then draw a line through the points. Use squares I for the object of mass 0.5m. a. 2m \t Lt. lLlelul’I _.._—.-—_.__m.-mmm_...rw.'4 (I ] L‘- 3 4 A constant force applied to object A causes A to Fme‘mhsrm‘s} accelerate at 5 mfsz. The same force applied to object B causes an acceleration of 3 mfsz. Applied to object C, it causes an acceleration of 8 mfsz. a. Which object has the largest mass? _.____8._._._ b. Which object has the smallest mass? C- c. What is the ratio of mass A to mass B? (mAl’mB) : 3/5 A constant force applied to an object causes the object to accelerate at 10 mfsz. What will the acceleration of this object he il'M : 3;) fl a. The Force is doubled? if"— b. The mass is doubled? i$%_ ‘ c. The force is doubled and the mass is doubled? 2M "VS; (= g"... d. The force is doubled and the mass is halved? “(0 W5 ‘6 ‘55 ) '12. A constant. force applied to an object causes the object to accelerate at 8 misl. What will the acceleration of this object be if ‘ G g \ b. The mass is halved? M” "V‘ a. The Force is halved? 3L ( ‘1’“ “V:- c. The force is halved and the mass is halved? fl = d. The force is halved and the mass is doubled? 1—ng Fa} - {a 4.5 Newton's Second Law l3. Forces are shown on two objects. For each: a. Draw and label the net force vector. Do this right on the figure. h. Below the figure, draw and label the object's acceleration vector. igd' (-3" at 4-4 CHAPTER 4 - FhrceandMotion '| 4. Forces are shown on two objects. For each: 3. Draw and label the net force vector. Do this right on the figure. I). Below the figure. draw and label the object’s acceleration vector. 15. In the figures below. one force is missing. Use the given direction of acceleration to determine the missing force and draw it on the object. Do all work directly on the figure. 16. Below are two motion diagrams for a particle. Draw and label the net force vector at point 3. no 0 o a 06-... z 5 1 _%5 3 _ F“? (7nd- 17. Below are two motion diagrams for a particle. Draw and label the net force vector at point 3. o 5 o r and o ’ o . . . .1 Force and Motion - FHA? 1 r~ R 4 4-5 4.6 Newton’s First Law I 8. If an ob_§eet is at rest, can you conclude that there are no forces acting on it”.J Explain. ' ++L. NO. Ob +5 Shit)? P‘Sf calf Elks \AS “balm actor-gm of- HM l‘omu, dkidn mm't'bc 2-00. L 0‘— . . A‘Ct Qurfi- wmwblnst-fla TIMI-€— New ‘9'- “*Y “"‘M 19. If a force is: exerted on an object, is it possible for that object to be moving with constanl velt'xtily'? Explain. - A 1‘: Mb‘ 0‘ “Ex-*0?“ 0‘ m OBA‘Cf; ‘4' MM+ LVN-c" (3‘ M32“ NM “1— +1 m—l-or‘ The. obj; 11 W-fibrcas M- "'5 Chang-a5 at“. coflfi'wfi “\0E31-<§ "Ck; “at”? Sun 0-? OK"’\" :5 fit”) I 20. A hollow lube forms three-quarters ofa circle. It is lying flat on a table. A bill] is shot through the. tube at high speed. As {he ha]! emerges from the mher end, does it follow path A, path B, or path C? Explain your reasoning ha“ 00”.“ {2°qu C. Rik, law-W5 “the. Jam” ike \mu m km 15va waffle-t tar-rH-x *‘h—dfik '9:- L owgi, «Wk no Md“ ‘l‘O'uw 05‘“ “" M {H a Sh~5k+ “'41.. t 4-6 CHAPTER 4 - Force and Motion 21. Which, if either, of the objects shown below is in equilibrium? Explain your reasoning. 5. F2 a.th akin”? A ‘5 “ht” OLJeg’r 'Pgisf \‘vx Eqwlubmum . The. ‘e‘l‘v‘u‘br‘l‘w‘ ' “flue Vet/+0? Sum we Flames 1:5. Vita; O is A ne‘l’ douhwaré- ‘FDNJOnA. I 22. Two forces are shown on the objects below. Add a third force F; that will cause the objectto be in equilibrium. a a a R F} E F. .5» 3 13‘ F3 5 23. Are the following inertial reference frames? Answer Yes or N 0. a. A .car driving at steady speed on a straight and level road. ‘ ‘(Qs b. A car driving at steady speed up a 10° incline. ___‘{_¢_5______ c. A car speeding up after leaving a stop sign. __NO_* (1. A car driving at steady speed around a curve. N° 6. A hot air balloon rising straight up at steady speed. Yes f. A skydiver just after leaping out of a plane. ___“_19____ g. The space shuttle orbiting the earth. NO Forccand Motion v CHAPTER 4 4-7 4.7 Free-Body Diagrams Exercises 24—29: - Draw a picture and identify the forces, then - Draw a complete free-body diagram for the object, following each of the steps given in Tactics Box 4.3. Be sure to think carefully about the direction of Fiat. Note: Draw individual force vectors with a black or blue pencil or pen. Draw the net force vector Fnclwith a red pencil or pen. 24. A heavy crate is being lowered straight down at a constant speed by a steel cable. Thain“? Y 2 T " _ _ x Fuck “ o ,1- b3 25. A boy is pushing a box across the floor at a steadily increasing speed. Let the box he “the system" for analysis. A Fwch “'f l:va (:3 \ Normlfiofifl- a _» Wfitfl‘h g-fu c1106 }¥ 5 “1:33th no 26. A bicycle is speeding up down a hill. Friction is negligible, but air resistance is not. )1 a‘ u _,. R‘ D ‘3 "sr- Rie re s isfince. Cl) "53) Nemli’orm'i 5 - whats c3 2?. You’ve slammed on your car brakes while going down a hill. You‘re skidding to a halt. / nor-mi “one F? inc:th {abru- ‘lz-c. weal-w Jo 4-8 I“ ll.\ 9'; R -—1 1 Force and Motion 2% You are going to toss a rock straight up into the air by placing it on the palm ot'your hand tyou’re not gripping it], then pushing your hand up very rapidly. You may want to toss an object into the air this way to help you think about the situation. The rock is “the system" of interest‘ a. As you hold the rock at rest on your palm. before moving your hand 7 if. FM." 3 O \ t x “cm a __ {vi-(e. of'lvuwl 0° wugkt u a b. As your hand is moving up but before the rock leaves your hand. .3 h The? nor-ml firm. a?" x u) / NR6!- I“ a _ ‘0 View“ .3 ct One~teoth ofa second after the rock leaves your hand. y, | i " i? J. @ u «k wastes C: d. After the rock has reached its highest point and is now falling straight down. (£0.3ch Lo 30. Block B has just been released and is beginning to fall. Consider hitmk A to he “the system." - Y T‘W‘bfl-T *7 ~ / not-MK gun. a .- Hh‘fl‘Foru. 1F“; .s WQ\§K‘\' L.) ...
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This note was uploaded on 09/27/2008 for the course PHYS 131-133 taught by Professor All during the Spring '08 term at Cal Poly.

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WB_Solution_Ch04 - Force and Motion 4.1 Force 1. Two or...

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