**Kinematics: ** The mathematical description of motion without any reference to the cause. The cause of this motion will be described in a later tutorial.

**Vector: ** A quantity that has magnitude, size, and direction. Velocity and displacement are examples.

**Scalar: ** A quantity that has only magnitude, or size. Speed, distance, and time are examples.

**Instantaneous velocity: **

The speed of an object at any particular instant.

**Average velocity:** The total distance traveled divided by the total time of travel.

**Acceleration: **The rate of change of velocity. Acceleration describes how fast an objects speed is changing per amount of time.

**Kinematic Equations:** Formulas that relate the variables of motion.

v=d/t

a = Δv/Δt=(v_{f}-v_{i})/t

d=v_{i}t+at^{2}/2

v_{f}^{2}=v_{i}^{2}+2ad

acceleration due to gravity = -9.8 m/s^{2}

**Free Fall: **Motion where gravity is the only force acting on an object. Gravity will accelerate an object at -9.8 meters per second per second.