PHYS 112 - 003
Introductory Physics I
Lecture 2
INSTRUCTOR: MARIE-PIERRE MILETTE

Assignment
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There is a “bonus” assignment to introduce you to Mastering
Physics (extra credit).

Vectors Summary
Vector
࠵?
⃗
:
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Arrow’s length indicate the
vector’s magnitude
A
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Arrow’s direction indictae
the vector direction
࠵?
Vectors can also be
represented with their scalar
components:
u
࠵?
⃗
=
࠵?
&
, ࠵?
(
x
y
࠵?
⃗
࠵?

Today’s Outline
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Introducing physics
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What is physics?
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Modeling
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Problem solving
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Why is this true?
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Motion and how to describe it
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Motion diagrams
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Quantities to describe motion

Today’s Outline
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Introducing physics
u
What is physics?
u
Modeling
u
Problem solving
u
Why is this true?
u
Motion and how to describe it
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Motion diagrams
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Quantities to describe motion

What is physics?

Modeling
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A model is a simplified representation of an object,
a system (group of objects), an interaction or a
process.
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When creating a model, scientist decides which
features to include and which to neglect.

Example of modeling:
Simple point-like object
Car moving from point A to point B
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If looking at distance the car is moving we can
model it as a point like object
A
B
x

Example of modeling:
Simple point-like object
Car moving from point A to point B
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Car moving into a parking spot can not be modeled as a point like
object

Problem solving
Problem solving steps:
1.
Sketch and translate
2.
Simplify and diagram
3.
Represent mathematically
4.
Solve and
Evaluate

Learning Physics
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The most important strategy to help you learn physics is called
interrogation

Today’s Outline
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Introducing physics
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What is physics?
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Modeling
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Problem solving
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Why is this true?

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