# Physics Sections 2.1/ 2.2: Scalar &amp; Vector Quantities and Linear Motion a quantity with a magnitude only
Scalar a size or amount with units
Magnitude
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Physics Sections 2.1/ 2.2: Scalar &amp; Vector Quantities and Linear Motion
or any similar topic only for you a quantity with magnitude and direction
Vector a method for finding a resultant vector in which the tail of one vector is drawn from the tip of another vector
Tip to tail method the starting point of a vector
Tail Tip the sum of two or more vectors
Resultant vector the two vectors that are perpendicular to each other and equal the original vector when added together
Components the location of an object in a given frame of reference
Position a scalar measurement of the length of a path connecting two points
Distance a vector quantity that measures how far and in what direction one position is from another position
Displacement a scalar quantity that describes the rate at which something is moving
Speed the speed of an object at one exact moment
Instantaneous speed the total distance traveled divided by the time it takes to travel that distance
Average speed a vector quantity that describes the rate of change of position
Velocity the displacement divided by the time interval needed to travel the displacement
Average velocity the speed and direction an object is moving at one exact moment
Instantaneous velocity a device that measures the time that an infrared beam is blocked by an object passing through the beam
Photogate a vector quantity that describes the rate of change of velocity
Acceleration
a description of the motion of an object near the surface of the Earth while under the influence of only gravity
Free-fall the magnitude of the acceleration of an object in free-fall
Acceleration due to gravity the vantage point from which an observer makes measurements of the motion of an object
Frame of reference the velocity of an object measured in the reference frame of a second object
Relative velocity a frame of reference that is moving at a constant velocity
Inertial reference frame a frame of reference that is accelerating
Non-inertial reference frame

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