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Understanding Scalars and Vectors in 2-D Motion Physics

Dive into Chapter 3, Section 1 of Physics to grasp the concepts of Scalars and Vectors. Learn about scalar quantities that have magnitude only and vectors that have both magnitude and direction. Explore graphical methods to add and subtract vectors, understand the properties of vectors, and more.

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Understanding Scalars and Vectors in 2-D Motion Physics

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  1. 2-D motion (no projectiles – yet) Physics Chapter 3 section 1 Pages 84-87

  2. Scalars and Vectors • Scalar – physical quantity that has only magnitude, but no direction • Examples  number of people on a bus  volume  pages in a book

  3. Scalars and Vectors • Vector – physical quantity that has magnitude and direction • Examples  velocity, acceleration • Multiplying vectors by a scalar results in a vector quantity

  4. 2 meters 1 meter Vectors • Vector symbol = “  “ over the abbreviation and direction • Length of the vector in a diagram = magnitude

  5. Vectors • Vectors can be added graphically but only if the units and measured quantities are similar

  6. Vectors • Resultant vector – vector representing the sum of 2 or more vectors • Draw vectors to scale • Add or subtract by head to tail method

  7. Vectors

  8. Vectors • Properties of vectors - 2 vectors act at the same point - Resultant vector has the net effect of both component vectors - Triangle method

  9. Vectors • Vectors can be added in any order because they are independent of each other • Subtract by adding a vector of opposite sign

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