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