Lecture_6

Lecture_6 - Can choose a different coordinate system for...

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2D & 3D

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Reference Frames Reference frame is up to observer. Must include an origin. Newton's Laws work in in any inertial (constant velocity) reference frame.
Example

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Reference Frame
Other Applications of Newton's Laws In 2D so now we can deal with lots of different situations that all use the same physics. Those that you should be familiar with from examples in the chapter: Inclined Planes Friction Pulleys and cables Accelerometers

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Inclined Plane with Friction Identify forces and directions Normal force is perpendicular to the surface Friction is parallel to the surface Use kinetic friction since the sled will slide Gravity points straight down, only force that is not in one of the axial directions. Break it into components. Identify important relationships: There is no acceleration out of the plane of the slope
Pulleys Defining your coordinate system and sticking to it will be important.

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Unformatted text preview: Can choose a different coordinate system for each object. Identify forces and important relationships: Tension in the rope will be the same (assumes massless rope) Atwood Machine Accelerometer Used to measure acceleration Can be as simple as a rock and a string. Measure angle, measure acceleration. ∑ F y = T y − mg = ma y ∑ F y = T y − mg = ma y ∑ F x = T x = ma x Ears and Balance Hairs in your ear measure acceleration in a way similar to a rock on a string. Non-Inertial Reference Frames When one reference frame is accelerating, e.g. the plane, and another is not, e.g. the ground, observers in the different reference frame observe different phenomena – different rules apply. We stick to inertial (non accelerating) reference frames because Newton's Laws work for all of them....
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This note was uploaded on 12/07/2011 for the course PHYS 220 taught by Professor Chang during the Fall '09 term at Purdue.

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Lecture_6 - Can choose a different coordinate system for...

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