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Chapter Four
measurement and motion
Question | Answer |
---|---|
acceleration | the rate of change of velocity over time |
uniform acceleration | see constant accelertaion |
air resistance | the resisting effect on a moving object due to friction of air. |
delta | the symbol that indicates the difference or change between two quantities. |
slope | a line's vertical change divides by its horizontal change |
time of flight | the elapsed time an object or projectile spends in the air |
m/sec^2 | a metric unit of measure for velocity |
free fall | movement that is due only to the force of gravity. |
friction | the force that opposed the relative motion of bodies. |
initial speed | the speed an object has at the beginning of an experiment |
term | a component of an equation |
terminal speed | maxium speed reached by an object in free fall; the speed at which forces of gravity and air resistance are equal |
constant acceleration | an accerelation that does not change; it is due to a velocity that changes at a constant rate |
acceleration due to gravity(g) | the acceleration of anobject due to earth's gravitational field strength;equal to 9.8 m/sec^2 on earth |