Some examples of things that are fast include cheetahs, race cars, and high-speed trains.
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Some examples of fast things include cheetahs running, lightning striking, and Formula 1 cars racing.
The study of how fast things move falls under the field of kinematics, which is a branch of classical mechanics. Kinematics focuses on describing the motion of objects without considering the forces that cause the motion. Topics within kinematics include speed, velocity, acceleration, and trajectory.
A Chinese yoyo can spin at a fast rate, with experienced users able to maintain spins for several minutes. The speed of the spin can vary depending on the skill level and technique of the user.
The sinking speed of an object depends on its density and shape. Objects with high density and streamlined shape tend to sink faster, while objects with lower density and irregular shape can sink more slowly. The surrounding fluid's properties, such as viscosity and temperature, can also affect how fast something sinks.
Velocity is a measure of an object's speed and direction of motion. It describes how fast an object is moving and in which direction it is moving.