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PHYS 101: Physics for the Life Sciences - Lecture 1: Review of Linear

Kinematics and Dynamics I

Average Velocity:

●

Δ

x = xf - xi

● Vavg =

Δ x

Δ t

●

Δ

x and Vavg only depend on initial and final values i.e. they are path independent

quantities.

● For a round trip (i.e. xf = xi) the Vavg is the same as the slope of a line that connects the

two points (tf,xf) and (ti,xi).

Instantaneous Velocity:

● V(t) = velocity at some instant of time

● To get instantaneous velocity calculate Vavg the for the two times close the point of

interest.

● xi = initial position = x(t)

● xf = final position = x(tf) = x(t +

Δ

t)