226 Potential Energy*P8.20When block B moves up by 1 cm, block A moves down by 2 cm and the separation becomes 3 cm.We then choose the final point to be when B has moved up by h3and has speed vA2. Then A hasmoved down 23hand has speed vA:KKUmvmvmghmg hmghmvvghgigfABA2AA2A++=++=+FHGIKJ+−==ej000121223233588152Section 8.3Conservative and Nonconservative ForcesP8.21Fmgg===4 009 8039 2...kgm sN2bg(a)Work along OAC =work along OA + work along AC=°+°=+ −=−FFggOAACN mmJafafcos.cos90 018039 25 0039 25 001196(b)Walong OBC =Walong OB + Walong BC+°39 25 0018039 25 0090 0196coscos.mmJOBAC(5.00, 5.00) mxyFIG. P8.21(c)Work along OC FgOCcos135=×−FHGIKJ39 25 00212196mJafThe results should all be the same, since gravitational forces are conservative.
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .