1. Distance: The total length covered by an object in motion.

2. Time: The duration it takes for the object to cover that distance.

Speed is calculated by dividing the distance traveled by the time taken:

Speed = Distance / Time

For example:

* If a car travels 100 kilometers in 2 hours, its speed is 100 km / 2 hours = 50 km/h.

Factors that can affect speed:

* Force: The push or pull acting on an object. A greater force generally leads to greater speed.

* Mass: The amount of matter in an object. Heavier objects tend to move slower than lighter objects with the same force applied.

* Friction: The force that opposes motion between surfaces in contact. Friction slows down objects.

* Gravity: The force of attraction between objects with mass. Gravity can affect the speed of falling objects.

* Air resistance: The force that opposes the motion of an object through air. Air resistance slows down objects, especially at high speeds.

It's important to note that speed is a scalar quantity, meaning it only describes the magnitude (how fast) and not the direction of motion. Velocity, on the other hand, is a vector quantity that includes both magnitude and direction.