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1

Four steps of problem solving strategy

Identify, Setup, Execute, Evaluate

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2

Unit of distance and unit of time

meter, second

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3

**model**

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

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4

unit vector

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

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5

Displacement

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

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6

**scalar quantity**.

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

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7

**vector quantity**

has both a magnitude and a direction in space.

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8

**negative vector**

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

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9

**antiparallel** vector

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

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