x (m) t (s) 0 What does the y-intercept represent?. x (m) t (s) 0.
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Transcript of x (m) t (s) 0 What does the y-intercept represent?. x (m) t (s) 0.
Chapter 2 - Motion
Physical Science – Introduction to Physics
What is Physics?
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)
MotionScalar vs Vector
Scalar – a measurement of magnitudeVector – a measurement of magnitude and
direction.
MotionScalar Quantities
DistanceSpeed
Vector Quantities
Displacement (Change in Position or xf – xi)
VelocityAccelerationForce
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
Begin with this motion.Write the mathematical relationship.
x (m)
t (s)0
What does the y-intercept represent?.
x (m)
t (s)0
Write the mathematical relationship for this motion.
x (m)
t (s)0
xf = vt + xi
x (m)
t (s)0
t
t
xx
What does the slope of this line tell you?
Slope =
t
t
xx
Slope =
t
t
xx t
x
Slope of a Position-Time Graph = Average Velocity
Slope =
t
t
xx
t
x
Since the relationship is a straight line, any 2 points may be used to find the
slope.
This average velocity...
x
t
x
t
The average velocity equals the velocity for any time interval if the position-time
graph is a straight line.
t
x
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.