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DiscussionHW1

# DiscussionHW1 - ACCELERATIUN IN DNE DIMENSIUN 4 M"£3...

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Unformatted text preview: ACCELERATIUN IN DNE DIMENSIUN 4%: M? "£3 Name Mach HW—lﬂ l . A ball rolls up, then down an incline. Sketch an acceleration diagram for the entire motion. [An K} acceleration diagram is similar to a velocity diagram; however, the vectors on an acceleration diagram represent the acceleration rather than the velocity of an object.) . ._.~. J _ J —’ 53' (2' (ix/ea t a M . ._-'- _~. _..~ Unuplt an MrM/M mi} 74??? f E: g 4i a \$12312)“ Domsﬂtjll 2. Sketch 1 versus 1‘, 3 versus 1, and a versus 1? graphs for the entire metion of a ball rolling up and then down an incline. a. Use a coordinate system in which the positive x-direction is down the track. it v H} a A I.) : I}. Use a coordinate system in which the positive x-direction is up the track. tar—set) : ti o. Can an object have a negative acceleration and be speeding up? If so, describe a possible (i 3 physical situation and a corresponding coordinate system. If not, explain why not. L {g} _ ﬁe M173 Mi Jan tile iridfht with pale Wan?» of? 3539 1‘14? . Talc-rials in Introductory Physics ﬂPrentice Hall, Inc. McDenriott, Shaffer. dc P.E.G.. U. Wash. x First Edition. 21302 Mech Acceleration in one dimension H'W-II! 3. Describe the motion of an object: a. for which the direction of the acceleration is the same as the direction of motion of the object. \$031? uF (QM 53.5 my? ﬁrst a? ﬁoéﬁa) it) h. for which the direction of the acceleration is opposite to the direction of motion of the object. 6):??be dim t e in” i5 nil/tat pf) at? ‘53 MAI-1e) rd c. for which the change in velou.‘.:it‘_tur is zero. were at MSW Mdmff H) d. for which the initial velocit},r is zero but the acceleration is not zero. Wits it is” is rakes-ii. {KW Mi of {915 far? sf a In as. H) 4. Two carts roll toward each other on a level table. The vectors represent the velocities of the carts just before and just after they collide. ——-+ 4e— ~4— + a s a e I... _ ”I!I 0-! ”ll! Before ii} are: if) a. Draw and label a vector for each cart to represent the change in velocity from before to after the collision. Make the magnitude and direction of your vectors consistent with the vectors drawn ahgve. Q J ”1;? 1/ 'l. 3 (ii; A all: V164}; v—J—FGL 1 vi a— “T3”: if. E- ‘3 It i 4 I. j a? a. ’7 c 4* of a) h. Howr dtku'is the direction of dte average accelemtion of cart A compare to the direction of the average acceleration of cart B over the time interval shown? Explain. J Jae tit ﬁi‘iﬁ dismal at» “ii (is 51A J ii” W n. a} that We is in appear» alt-edits (0mm! wait lit/e, c. For the time interval shown, is the magnihsde of the average acceleration of can A greater than, less than. or equal to the magnitude of the average acceleration of cart B'l' Explain. timid a - o "i 4mm; ’ ﬁLiﬁ 7 [45%; ) Tutorials in introductory Physics @Pmntice Hall. Inc. McDennol‘t, Shaffer. Jr. REE" U. Wash. _ First Edition, 21112 1%!!! ACCELERATIUN IN oNE DIMENSIDN Nam M HIV-15 . In this problem, a cart moves in various ways on a horizontal track. A coordinate system with the positive redirection to the right is used to measure each motion. For each motion. one of ﬁve different representations is given: a strobe diagram, a velocity versus time graph, a set of instantaneous velocity vectors. a written description, or a pair of arrows representing the directions of the velocity.r and acceleration. Give the remaining four representations for each motion. The ﬁrst exercise has been worked as an example. Given: velocity vectors written descriptimt arrows direction of e: Thecartmovcsinﬂme posttlve dlrecnon and direction of a.- arrows direction of e: if? dimcgon of a: velocity vectors written description 3;: tie curt was?" Ht aJF—r—rs VI Foams? difiéhil‘i (Wi (““5 this _ dtsﬂ- 1”) i C. Given: graphofvvsr I. F - 1 . -—-—? PM") T": air—M direction of p: , ”3 é-FF— é— {V ”a 4.,- f 1’ direction of a: ' v4 ‘5. Tutorials in Imrmiuctory Physics @Prentioe Hal]. Inc. I'lllchci'tnitht1 Shaffer1 3'. PE.G.. U. Wash. _ ﬁrst Edition. 2W2 Mach Acceleration in one dimension HW—lﬁ 6. Carts A and B move along a horizontal track. The strobe diagram shows the locations of the carts at instants i—S. separated by equal time intervals. I 2 3 4 .5 I I I - - Can: a i}; III III III III III Cart is i 2‘ 3 4 5 a. At instant 3: *- is cart A speeding up. slowing down. or moving with constant ape d? Explain. A not; in st revisit éff’fi/ start if attic/,9 mitt? 5W _ in viewer assert see. , . ”j . Ii ts cart B speeding up, slowuig own, or moving w1tl't constant speed? Explain. B tea-Wafers ii tee/g fastening asides Wig b. Is the speed of can B greater titan. less titan, or equal to the speed of cart A; s at instant 2? Explain. i/ﬂ} 4-, IQ it? . I. a w W ,ﬁ .r’i sings, {Eater‘s ifismtgeﬁmtﬂﬂf {WM “if ’4 / - at 'nstant 3? Ex lain. - 1 P ié’é Kg 3’!) gem-E tilt HIM-iii ‘15 '. fi' c. During at am time interval mjus before instant 2‘ until just after instant 2, does the distance between cart A and cart B @i crease, or remain the same? Explain. i and”. fl is still We? filli- rwfﬂre! will 3 at W ﬂee-i ”ti’i? A i} is emit? psi? . r / Consider the following response to the above question: "For the ems-ii intervsi containing instant 2. cart 5 is ahead ansI speeding up. so the distance between the carts must be increasing." Do you agree or disagree? Explain. it dead rte. EV ﬁgﬂwﬁg ”f’ M Tl; 5M3 sit” #5 14'9” wlffi EV d. Is there an}P time interval during which can A and cart B have the same average velocity? If so. identify-r the interva1[s] explain. if not, explain vvl'i}r not. it’s , Wits 4'54”“; state both red; trait] tit seat disanetﬂ ) Is there an}.r instant at which cart at and cart B have the same instantaneous velocity? If so. identifyr the instantts] leg. “at instant I," or “at an instant between 2 and 3”} and explain. If not. explain whjl.r not. is. a an rem We W 5- y f ea We}; at 4 mi am at 5. Tutorials in Introductory Physics Q'Preutice Hall. Inc McDermott, Shaffer. \$5 P.E.G., Li. Wash. _ First Edition, 2002 k.) ACCELERATION nv om: DIMENSION Name Mach HW—I? T. Two cars, C and D. travel in the sMe direction on a long, straight section of highway. During a particular time interval at”. car D is ahead of car ('3 and is speeding up while car C is slowing down. During the interval at” it is observed that ear ('3 gains on car D (ties, the distance between the cars decreases}. Explain how this is possible, and give a speciﬁc example of such a case. _____.;;sg PE; 4M3MIDWX (r3: ginkgﬂddwit/ )Jyf €32:er E 51;” its a [str sM- at his? aims W1 #72 , m ﬂ. 4% kiwi»: Mr“ {Jim séarssr'a d _,_.—.. '_._____________ 8. Two cars, P and Q, travel in the same direction on a long, straight section of a highway. Car P passes car Q. and is adjacent to car Q at time n. a. Suppose that car P and car Q each move with constant speed. At time to, is the magnitude of the instantaneous velocit],r of car P enter t . iass than, or agent to the magnitude of the instantaneous velocin of car Q? Exp am. {I '4’“ Fam/ﬁatttwt‘flwfmtsfaﬂ/ Pﬁdﬂdﬁ- Eli—i means i7 natal; {agar R: a: "He? WFWf/ / 50 k VF P Vii. (V b. Suppose instead that car P is moving with constant speed but car Q is speeding up. At time t... is the magnitude of the instantaneous velocity of car P @r Ears than, or equai to the magnitude of the instantaneous velocity ofcar Q? Explain. a) ——-—-—‘;Ht g f 71/ LE KP? Ks since. a?‘ W 1'53“” Womb (9 MM 5 (“V .i 1E wwndtof‘mﬂ. M ,—_._._._ 73’??? Erin/Wm is and : r asst 742* Hie? digestive 5/55 44:; if} new (as; :5 a Edam}? “if UMEC W”? 9???ng i _ Tutorials in Introductory Physics @Prentice Hall, Inc. McDen'nott, Shnﬁer. d: P.E.G.. U. Wash. _ First Edition. too: ...
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