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# U01 Vocab

### Motion/Free Fall

TermDefinition
-/+ signs direction indicators
horizontal left to right
vertical up and down
scalar a quantity without given direction, displayed as a line representing size (magnitude) of a measurement or variable
vector a quantity that contains a direction, displayed with an arrowhead representing a size (magnitude) and direction for a measurement or variable
delta greek letter (triangle) which means a change in
magnitude the size or amount of a measurement
direction the route an object is headed, shown as a compass direction indicators, -/+ signs, worded indicators (left, right, up, down)
speed how fast or slow something changes positions, units (m/s)
velocity how fast or slow something changes position that also must include a direction, units (m/s)
constant velocity a constant change in position over time, every second that passes by an object moves the same distance, units (m/s)
zero velocity an object at rest, no motion, written as 0m/s
initial velocity the velocity an object has before an changes occur, written as v(subtitle)0
increasing velocity speeding up, getting faster; a positive slope on a position vs. time graph
decreasing velocity slowing down, getting slower; a negative slope on a position vs. time graph
terminal velocity the maximum velocity an object can contain while in free fall, it is when the downward force of gravity is equal to the upward force of air resistance (forces are balanced, acceleration = 0m/s^2)
gravity a force of attraction between any two objects, most offend analyzed between an object and Earth, units (N)
acceleration a change in velocity; the rate at which velocity is changing over time, it can occur in 3 ways: speeding up, slowing down, or changing direction (meters per second, second or m/s^2)
acceleration due to gravity the rate at which an objects accelerate due to the force of attraction between an object and Earth, (-9.8 m/s^2)
Created by: rachiekatherine