In physics, time is defined simply as change or the interval over which change occurs; it's impossible to perceive the passage of time without some form of change. where Δt is the change in ...In physics, time is defined simply as change or the interval over which change occurs; it's impossible to perceive the passage of time without some form of change. where Δt is the change in time or elapsed time, tf is the time at the end of the motion, and t0 is the time at the beginning of the motion. (As usual, the delta symbol, Δ, means the change in the quantity that follows it.)
