Helpful Definitions

Drag- The force that acts opposite to the direction of motion.

Force- External action acting on an object to make it move.

Friction- The resistance that one surface or object encounters when moving over another.

Gravity- Force that attracts a body toward any other physical body having mass

Lift- Sum of all forces on a body that cause it to move upward to the direction of flow.

System- A group of related parts that make up a whole and can carry out functions its individual parts cannot.

Thrust- The force that propels an object in the direction of motion.