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Remember: This Week Read Ch. 7: Ch. 7.1 – 7.6, 7.8. Start Ch. 8. CAPA assignment #10 is due Friday at 10 PM, to be done on‐line. Recitation: Tutorial is a Review of Chs. 1-7. Print & bring to Lab. Make-Up Lab Period: Let your TA know. Problem session: Today 4 – 5:00PM, G2B75-77 . L27 M 3/15/10 1 Physics 2010

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L27 M 3/15/10 Physics 2010 2 “Roller Coaster” Problems h gives us PE: can replace h with PE.
L27 M 3/15/10 Physics 2010 3 “Roller Coaster” Problems h gives us PE: can replace h with PE. No friction: E tot = ME = KE + PE is constant: horizontal line gives E tot . Can read the PE & KE off the curve for every position.

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L27 M 3/15/10 Physics 2010 4 E tot A cart rolls without friction along a track. E tot = ME = KE + PE = 45 kJ. The top of the hill at x = 62 m is round and the bottom of the valley at x = 130 m is Fat. To within 5 kJ, what is the maximum KE? A) 25 kJ B) 7 kJ C) 45 kJ KE KE = E tot PE = 45 J 10 J = 35 J
L27 M 3/15/10 Physics 2010 5 E tot A cart rolls without friction along a track. E tot = ME = KE + PE = 45 kJ. The top of the hill at x = 62 m is round and the bottom of the valley at x = 130 m is Fat. When KE is minimum (over this stretch of track), what is the direction of acceleration?

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