1. Changing the Speed:

* Pedaling: Applying force to the pedals increases the bicycle's speed.

* Braking: Applying the brakes decreases the bicycle's speed.

* Gravity: Going downhill increases speed, while going uphill decreases speed.

* Air resistance: The faster you go, the more air resistance you encounter, which slows you down.

2. Changing the Direction:

* Steering: Turning the handlebars changes the direction of the bicycle.

* Leaning: Leaning into a turn helps you maintain balance and navigate curves.

Important Note: Velocity is a vector quantity, meaning it has both magnitude (speed) and direction. Therefore, changing either the speed or the direction will change the velocity of the bicycle.