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phys1441-spring08-021308-post

# phys1441-spring08-021308-post - PHYS 1441 Section 002...

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Wednesday, Feb. 13, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 1 PHYS 1441 – Section 002 Lecture #9 Wednesday, Feb. 13, 2008 Dr. Jae hoon Yu Motion in Two Dimensions Projectile Motion Maximum ranges and heights Newton’s Laws of Motion –F o r c e Newton’s first law: Inertia & Mass Newton’s second law

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Wednesday, Feb. 13, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 2 Announcements •1 st term exam next Wednesday, Feb. 20 – Time: 1 – 2:20pm – Place: SH103 – Covers: Appendices, CH 1 – CH4.4 – Style: mixture of multiple choices and essay problems – Class on Monday, Feb. 18: Jason will be here to go over the any problems you would like to review • Colloquium today – UTA Physics faculty research topics – Good opportunity to learn what UTA Physics does – Possibly working with them if you are interested in…
Wednesday, Feb. 13, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 3 Reminder: Special Project • Show that a projectile motion’s trajectory is a parabola!! – 20 points – Due: Wednesday, Feb. 27 – You MUST show full details of computations to obtain any credit

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Wednesday, Feb. 13, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 4
Wednesday, Feb. 13, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 5 Projectile Motion • A 2-dim motion of an object under the gravitational acceleration with the following assumptions – Free fall acceleration, g , is constant over the range of the motion and – Air resistance and other effects are negligible • A motion under constant acceleration!!!! Î Superposition of two motions – Horizontal motion with constant velocity ( no acceleration ) – Vertical motion under constant acceleration ( g ) g = G 9.8 j G ( ) 2 ms x a = y a = 2 0 2 9.8 xf v = yf v = 0 x v 0 yy va t + = ( ) 0 9.8 y vt +−

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Wednesday, Feb. 13, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 6 x-component ( ) 1 2 xo x xv v t =+ 2 1 2 xo x x vt a t x xo x vv a t 22 2 xx o x a x ( ) 1 2 yo y yv v t 2 1 2 yo y t a t yy o y a t 2 o y a y Kinematic Equations in 2-Dim y-component
Wednesday, Feb. 13, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 7 a = G i i f v x t θ cos = Show that a projectile motion is a parabola!!!

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phys1441-spring08-021308-post - PHYS 1441 Section 002...

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