Motion Graphs
(d vs t)

Acceleration Review

#7 - Acceleration - the time rate of change in ______

Velocity

a = ∆V/∆t = (Vf - Vi)/t

Which data shows uniform acceleration? Why?

 time (sec) Velocity (m/s) 0 5 1 7 2 9 3 11 4 13
 time (sec) Velocity (m/s) 0 5 1 10 2 14 3 20 4 30

Left Data Shows Constant Acceleration

a = ?

a = 2 m/s2

Acceleration?

Use a = ∆V/∆t
to find the acceleration

a = 7.5 m/s2

Slope of a V vs. t plot
tells us about the objects ...

... acceleration

Slope = ∆y/∆x

= ∆V/∆t

= a

Acceleration is ...

Zero

Velocity is ...

Constant

 Describe Acceleration, Velocity         Velocity is Decreasing,   Acceleration is  constant, negative             a = ∆V/∆t        (15 m/s - 45 m/s )     (8 sec - 2 sec)      = -5 m/s2       Describe acceleration and velocity Velocity (m/s)

Acceleration is increasing

Velocity is increasing

Describe the Velocity, Acceleration

Velocity is increasing

Acceleration is constant & Positive

Velocity? Acceleration?

Velocity is decreasing

Acceleration is

constant & negative

Most important plots

 Increasing Velocity Constant Acceleration Increasing Velocity Constant Acceleration