| Term | Definition |
|---|---|
| Roll | Rotation around the front-to-back axis |
| Pitch | Rotation around the side-to-side axis |
| Yaw | Rotation around the vertical axis |
| Thrust | A force that moves an aircraft in the direction of the motion. It is created with a propeller, jet engine, or rocket. Air is pulled in and then pushed out in an opposite direction. One example is a household fan. |
| Drag | The force that acts opposite to the direction of motion. It tends to slow an object. Drag is caused by friction and differences in air pressure. An example is putting your hand out of a moving car window and feeling it pull back. |
| Weight | The force caused by gravity. It acts in a downward direction—toward the center of the Earth. |
| Lift | The force that holds an airplane in the air. The wings create most of the lift used by airplanes. Drag is caused by friction and differences in air pressure. |
| Term | Definition |
|---|---|
| Aft | Toward the stern (rear) of a ship |
| Adrift | floating in the water without propulsion |
| Astern | Toward the rear of a ship (opposite of "forward") |
| Bow | Front of a ship (opposite of "stern") |
| Fore/Forward | At or toward the front of a ship or further ahead of a location (opposite of "aft") |
| Port | The left side of the ship, when facing forward (opposite of "starboard") |
| Starboard | The right side of the ship, when facing forward (opposite of "port") |
| Stern | The rear of a ship (opposite of "bow") |
| Topside | On the ship's main weather deck |
| Underdeck | A lower deck of a ship |
| Part | Use |
|---|---|
| Frame | * Top Tube, Down Tube, Seat Tube, Seat Stay, Chain Stay, Head Tube, Stem, Fork, Shock Absorber |
| Seat Tube | |
| Seat Post | |
| Saddle | |
| Handlebars | * Grips, Brakes |
| Wheel | * Spokes, Hub, Cogset, Rim, Tire, Valve, Inner Tube |
| Rear/Front Brakes | |
| Rear/Front Derailleur | |
| Pedal | * Toe Clip |
| Crank Arm |