a quantity with a magnitude only

Scalar

a size or amount with units

Magnitude

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

the arrowhead of a vector

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