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## One Dimensional Motion

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**One Dimensional Motion**AP Physics C**Terms**Displacement vs. Distance Displacement: Change in position (vector) • Distance: How far an object has travelled (scalar) • Symbol:Δx or Δx • SI Unit: meter, m**Terms**Velocity vs. Speed • Velocity: Rate of the change in position (vector) • Speed: Rate of distance covered (scalar) • Symbol:v or v • SI Unit: meter per second, m/s**Terms**Acceleration vs. Acceleration • Acceleration: The rate at which velocity changes (vector) • Acceleration: The rate at which speed changes (scalar) • Symbol: a or a • SI Unit: meters per second per second or meters per second squared, m/s/s or m/s2**Velocity vs. Time Graph**• The slope of a v vs. t graph is the acceleration • The area between the curve and the horizontal axis of a v vs. t graph is the displacement**Instantaneous Acceleration vs Average Acceleration from a**v-t graph**Acceleration vs. Time Graph**• The slope means NOTHING • The area between the curve and the horizontal axis is the change in velocity a 10 s t -10 m/s/s**Important**Acceleration tells us how fast velocity changes Velocity tells us how fast position changes**Falling Bodies, thrown up objects, and the y-direction**• All things fall at the same rate (neglecting air resistance) • On earth that rate is 9.80 m/s2 • That rate is an acceleration • The name of that acceleration is Gravity