x (m) t (s) 0 What does the y-intercept represent?. x (m) t (s) 0.

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Chapter 2 - Motion Physical Science – Introduction to Physics

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Chapter 2 - Motion

Physical Science – Introduction to Physics

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What is Physics?

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Chapter 2 - MotionTwo things must be measured to study motion.

1. Position of an object at any instance.2. Time elapsed.

Position – requires a point of reference to define this. (Origin)

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MotionScalar vs Vector

Scalar – a measurement of magnitudeVector – a measurement of magnitude and

direction.

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MotionScalar Quantities

DistanceSpeed

Vector Quantities

Displacement (Change in Position or xf – xi)

VelocityAccelerationForce

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Motion – Constant VelocityGraphing and Analysis 101 – Linear Relationships

Slope = velocity

Is velocity changingor constant?

Linear Equation Equation for this graph

y = mx + b xf = vt + xi

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Begin with this motion.Write the mathematical relationship.

x (m)

t (s)0

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What does the y-intercept represent?.

x (m)

t (s)0

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Write the mathematical relationship for this motion.

x (m)

t (s)0

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xf = vt + xi

x (m)

t (s)0

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t

t

xx

What does the slope of this line tell you?

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Slope =

t

t

xx

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Slope =

t

t

xx t

x

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Slope of a Position-Time Graph = Average Velocity

Slope =

t

t

xx

t

x

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Since the relationship is a straight line, any 2 points may be used to find the

slope.

This average velocity...

x

t

x

t

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The average velocity equals the velocity for any time interval if the position-time

graph is a straight line.

t

x

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MotionWhat would a position – time graph look like for an object that is speeding up?

Since slope represents the velocity, the slope would have to constantly increase.

What would a position time graph look like for an object which is slowing down?

Decreasing slope.