**Distance**– how far an object has traveled or moved.

**Displacement**– the change in position of an object.

**Speed**– the rate of motion, represented as the distance divided by time.

**Average Velocity**– the rate of motion in specific direction, represented by the total displacement divided by the time.

**Instantaneous velocity**– the velocity of an object at any instant of time.

**Acceleration**– the rate at which the velocity changes over time.

**Acceleration due to gravity**– the rate of change of the velocity of an object in free fall.

**Free fall**– the motion of an object acted on by the sole influence of gravity.

**Kinematics equation**– Equations used to calculate the motion for objects traveling at a constant acceleration.

**Motion graphs**– representations used to show how far a body has travelled, how fast it is moving and how it is changing speed.

**Projectile**– any object that is under the sole influence of gravity.

**Trajectory**– the path a projectile follows through space as a function of time.

**Terminal Velocity**– the maximum velocity reached by a falling object.

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