Published on 13 Feb 2017

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2-1 Reference Frames and Displacement

1. Any kind of measurement regarding speed or distance but have a frame of reference

2. Direction of motion must be specified. Thus the use of the coordinate axes in physics

a. In one dimensional motion, only the x-axis is used to show position

b. The y-axis is used for when an object is dropped

3. Displacement

4. Vectors are used to show displacement: movement and magnitude

2-2 Average Velocity

1. Average speed: distance traveled/time

2. Velocity includes magnitude and direction divided by time

3. Average velocity: (final position initial position)/time

4. Elapsed time is always positive

2-3 Instantaneous Velocity

1. Instantaneous velocity: average velocity over an infinitely small time period

a.

b. Though t approaches 0, it should not be set as 0

c. Instantaneous speed is the same as instantaneous velocity

d. Average velocity is the same as instantaneous velocity if objects travel at

constant speed

e. On a graph of position vs time, slope is the change of Δx/Δt, it is also the

average velocity on the interval

f. The instantaneous velocity is equal to the slope of the tangent line of the curve

g. Acceleration is a vector as well

h. A object that is slowing down is decelerating

i. This is not the same as a negative acceleration which inidcates

direction

i. Instantaneous acceleration (a): the value of the average acceleration as Δt

approaches 0

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