Chapter 1: Units, Physical Quantities, and Vectors

Four steps of problem solving strategy

Identify, Setup, Execute, Evaluate

Unit of distance and unit of time

meter, second

**model**

It is a simplified version of a physical system that would be too complicated to analyze in full detail.

unit vector

A(n) ________ has a magnitude of 1, with no units.

Displacement

________ is simply a change in the position of an object.

**scalar quantity**.

When a physical quantity is described by a single number, it is a **scalar quantity**.

**vector quantity**

has both a magnitude and a direction in space.

**negative vector**

A vector with the same magnitude but in the opposite direction is known as a **negative vector**

**antiparallel** vector

When two vectors and have opposite directions, whether their magnitudes are the same or not, we say that they are **antiparallel**.