{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

2c_lec3

2c_lec3 - Today Objects in free fall The vector description...

This preview shows pages 1–9. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Today: Objects in free fall. The vector description of motion. Relative Motion. Physics 2A Olga Dudko UCSD Physics Lecture 3 Superman #204 (vol. 2, April 2004) by Jim Lee and Scott Williams Objects in free fall x Objects in free fall = a t m a x h e i g h t v o = ?? v 2 = v 2 + 2 a Δ x Δ x = v t + 1 2 at 2 Δ x = 1 2 ( v + v ) t v = v + at v 2 = v 2 + 2 a Δ x = v 2 ¡ 2 a Δ x v = ¡ 2 a Δ x => => v = ¡ 2 ( ¡ 9 . 80 m s 2 )( 201 m ) = 62 . 8 m s • This is the initial velocity that Superman needs to attain maximum height. • Note: even though acceleration a < 0, the constant g is always >0. Motion in more than one dimension Vectors ? ? time, mass, energy… Vector notations • When handwriting - an arrow over it: • Printed - boldface type: • The magnitude of the vector - in italics or with the vector in the middle of absolute value lines: A A A A A Length of the arrow = magnitude of the vector quantity Orientation of the arrow = vector’s direction θ Adding vectors • When adding two vectors: make sure you take their directions into account; the units must be the same. • Perform the addition geometrically or algebraically. • Geometrically: vectors are placed head-to-tail: (resultant) A B B A + A B Adding multiple vectors • Vector addition is commutative: • When adding multiple vectors, just keep repeating the process until you have included all of the vectors....
View Full Document

{[ snackBarMessage ]}

Page1 / 22

2c_lec3 - Today Objects in free fall The vector description...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online