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speed is the
absolute value of velocity
if the slope of the position vs. time graph is linear, then
the acceleration = 0, and the velocity is constant (velocity gives the direction of displacement)
if the position increases (+∆x), then velocity is positive
if the position decreases (-∆x), then velocity is negative
if the position does not change, then velocity = 0
if the position vs. time graph slope is not linear, then
the velocity is not constant, and acceleration is changing
concave down
acceleration is < 0 (negative)
pointing up: the position increases, so velocity is positive, but acceleration is negative, so the speed decreases
pointing down: the position decreases, so velocity is negative, and acceleration is negative, so the speed increases
concave up
acceleration is > 0 (positive)
pointing up: the position increases, so velocity is positive, and acceleration is positive, so the speed increases
pointing down: the position decreases, so velocity is negative, but acceleration is position, so the speed decreases
for the velocity vs. time graph, if it is concave down
for pointing up, velocity is positive above the x axis and acceleration is positive since the slope of the graph is positive, thus it is speeding up but at a slower rate
the acceleration decreases but is greater than 0
for pointing down, velocity is positive above the x axis but acceleration is negative since the slope of the graph is negative, thus it is slowing down at a faster rate
the acceleration increases but is less than 0
for the velocity vs. time graph, if it is concave up
for pointing up, velocity is positive above the x axis and acceleration is positive since the slope of the graph is positive, thus it is speeding up at a faster rate
the acceleration increases and is greater than 0
for pointing down, velocity is positive above the x axis but acceleration is negative since the slope of the graph is negative, thus it is slowing down at a slower rate
the acceleration decreases and is less than 0