APHY201 2/24/2016 1. APHY201 2/24/2016 2 History   Earliest application was to the heavens: geocentric vs. heliocentric models of the solar system 2.1.

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Presentation transcript:

APHY201 2/24/2016 1

APHY201 2/24/ History   Earliest application was to the heavens: geocentric vs. heliocentric models of the solar system 2.1 Displacement   Distance vs. Displacement   Scalars and Vectors Δx = x f - x i xixi xfxf

APHY201 2/24/ Average Velocity   Speed is a scalar quantity   Average speed = distance/time   Instantaneous speed and your speedometer   Velocity is a vector quantity   Average velocity = displacement/time

APHY201 2/24/ Instantaneous Velocity   Instantaneous speed and your speedometer

APHY201 2/24/ Acceleration   A vector quantity   The change in the velocity over time   Name three ways you can accelerate while driving your car?

APHY201 2/24/ Acceleration   Explain the car’s motion in each case.

APHY201 2/24/ In class: Question 5 and Problem 3, 16 Other problems ↓ 6. The average velocity is given by The average speed cannot be calculated. To calculate the average speed, we would need to know the actual distance traveled, and it is not given.

APHY201 2/24/ The distance traveled is 2.0 miles The displacement is 0 because the ending point is the same as the starting point. (a)Average speed = (b) Average velocity =