# Physics Chapter 3

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1. A number with units is referred to as a __. However, because it is not enough, what else is required?
scara

direction and magnitude
2. What is the magnitude?

A quantity that is specified by both a magnitude and direction is called a __.
the distance covered

vector
3. The magnitude of a velocity vector is its __, and its direction is the __.
• speed
• direction of motion
4. In general, to find the components of a vector, we need to __. In two dimensions, we choose an _, and a __ for both the x and y axes.
set up a coordinate system

origin

positive direction
5. What is the rule for adding vectors?
To add the vectors A and B, place the tail of B at the head of A. The sum, C=A+B is the vector extending from the tail of A to the head of B
6. The sum of vectors is __ of the order in which the vectors are added
independent
7. The negative of a vector is represented by an __. That is, __.
arrow of the same length as the original vector, but pointing in the opposite direction

multiplying a vector by minus one reverses its direction
8. Describe unit vectors.
defined to be dimensionless vectors of unit magnitude pointing in the positive x and y directions, respectively
9. Explain multiplying vectors
+x --> increases the magnitude by a factor of x and maintains the direction of the vector

-x --> increases the magnitude by a factor of x and changes the direction of the vector

### Card Set Information

 Author: DesLee26 ID: 282505 Filename: Physics Chapter 3 Updated: 2014-09-09 18:47:31 Tags: Longo Folders: PHY 105 Description: Test One Show Answers:

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