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Principle of Physics course includes many basic theories and concepts we study in throughout Physics. Other title of the course is Core Physics. Keywords in here are: Motion, Speed, Average Speed, Instantaneous Speed, Magnitude, Direction, Vector Components, Adding Vectors
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70 miles per hour1)^
In 1 hour, we would travel 70 miles 2)^
Speed has a number (70) and a unit (miles per hour) 3)^
Miles per hour = miles/hour = mph = miles
hours (distance/time)
Average Speed
= distance traveled divided by time of travel
Average speed is a
rate
Converting units of speed: always distance/time1)^
Common Speeds
d^ t s
speed
^
distancetime
m/h
Km/h
m/s
Instantaneous Speed1)^
A Speedometer measures instantaneous speed 2)^
When you use different “speeds”a)^
Instantaneous speed tells you about the moment b)^
Average speed tells you how long the trip will take
3)^
Definition of Instantaneous Speed
= rate for a given instant = average
speed for a short time period where the speed changes little 4)^
Animation
Velocity = speed in a defined direction1)^
20 mph = speed 2)^
20 mph due North = velocity
B.^
Changes in Velocity1)^
Car on a curve: speed stays the same, velocity is always changing2)^
Any change in speed
or
direction
is a change in velocity C.
Instantaneous Velocity
= average velocity for a short time period where the
velocity changes little
Vectors are represented by arrows (Velocity is always blue in the book)
B.^
Math with vectors: Appendix C1)^
Specifying magnitude and direction on a graph
Vector Components
= any 2 or more vectors that add up to the original
vector (usually components on the x and y axes are used)
More Examples