What is the difference between velocity and speed?
Velocity requires both magnitude and direction to be fully defined, whereas speed describes only how fast an object moves. Physics distinguishes this vector quantity from simple scalar speed.
Velocity requires both magnitude and direction to be fully defined, whereas speed describes only how fast an object moves. Physics distinguishes this vector quantity from simple scalar speed.
Calculus allows physicists to calculate instantaneous velocity as the derivative of position with respect to time. This mathematical limit approaches zero for the time interval between two points on the timeline.
Escape velocity represents the minimum speed required for an object to leave Earth's gravitational field. This threshold sits at approximately 11,200 metres per second regardless of launch direction.
Special relativity introduces complexity by showing that observers moving at different speeds perceive these values differently. Modern theories suggest only relative velocity can be calculated between frames of reference.
Radial velocity measures movement directly away from or toward a central point. Transverse velocity runs perpendicular to the radial line along a circle centered at the observer.