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Motion - Principle of Physics - Lecture Slides, Slides of Physics

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

Typology: Slides

2013/2014

Uploaded on 01/31/2014

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How can we describe the various motions in this situation?
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How can we describe the various motions in this situation?

Describing Motion

I.^

SpeedA.^

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)

B.^

Average Speed

= distance traveled divided by time of travel

1) 2)^

Average speed is a

rate

C.^

Converting units of speed: always distance/time1)^

Common Speeds

d^ t s

speed

 

^

distancetime

centsdollar

or

runsgame

or

milesgal

or

x^ y

m/h

Km/h

m/s

D.

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

II.

VelocityA.^

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

5)^

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

2)^

Vector Components

= any 2 or more vectors that add up to the original

vector (usually components on the x and y axes are used)

5)^

More Examples