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physics vocab
for Test #1 of the year
13
Physics
10th Grade
09/30/2008

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Term
Base SI units
Definition
the fundamental units of the metric system (meters, kilograms, seconds)
Term
derived unit
Definition
any unit that is not fundamental and is a combination of kilograms, meters and/or seconds (m/s)
Term
scalar quantity
Definition
a quantity, such as mass, that can be specified entirely by size or magnitude.
Term
vector quantity
Definition
a quantity, such as displacement, which is specified by its magnitude (size) and its direction
Term
acceleration
Definition
the rate of change in velocity
Term
Acceleration due to gravity
Definition
the acceleration of a freely falling object in the absence of air resistance, which near the earth’s surface is approximately 9.81 m/s2
Term
acceleration-time graph
Definition
plot of the acceleration of an object as a function of time
Term
average acceleration
Definition
the acceleration of an object measured over a time interval
Term
Average velocity
Definition
the velocity of an object measured over a time interval; the displacement over time
Term
Constant acceleration
Definition
acceleration which does not change during a time interval
Term
Instantaneous
Definition
the value of a quantity at a particular instant of time, such as instantaneous position, velocity, or acceleration
Term
Kinematics
Definition
the study of how motion occurs, including distance, displacement, speed, velocity, acceleration, and time
Term
Velocity
Definition
ratio of the displacement of an object to a time interval
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