February 7 • Things You Need (short class period)

• Chapter 10 Notes • Calculator • Pencil

• Chapter 10 Quiz on Tuesday

Calculating Acceleration

(the last few slides of

10.3 notes)

= acceleration

Acceleration is measured in meters per second, per second. (meters per second squared)

Danica starts sledding with a velocity of 1 m/s. After 3 seconds her velocity is 7 m/s. What is her acceleration?

Initial Velocity: ?? Final Velocity: ?? Time Interval: ??

Danica starts sledding with a velocity of 1 m/s. After 3 seconds her velocity is 7 m/s. What is her acceleration?

Initial Velocity: Vi = 1 m/s Final Velocity: Vf = 7 m/s Time Interval: T = 3 s

Danica starts sledding with a velocity of 1 m/s. After 3 seconds her velocity is 7 m/s. What is her acceleration?

Vi = 1 m/s Vf = 7 m/s T = 3 s Plug the values into the

equation and solve for a

Danica starts sledding with a velocity of 1 m/s. After 3 seconds her velocity is 7 m/s. What is her acceleration?

a = 7 m/s - 1 m/s 3 s

a = 6 m/s 3 s

a = 2 m/s 1 s

a = 2 ms2

A man walking at .5 m/s accelerates to a velocity of .6 m/s in 1 s. What is his acceleration?

Vi = ? Vf = ? T = ?

A man walking at .5 m/s accelerates to a velocity of .6 m/s in 1 s. What is his acceleration?

Vi = .5 m/s Vf = .6 m/s T = 1 s

A man walking at .5 m/s accelerates to a velocity of .6 m/s in 1 s. What is his acceleration?

a = .6 m/s - .5 m/s 1 s

a = .1 m/s 1 s

a = .1 ms2

A train traveling at 10 m/s slows down to a complete stop in 20 s. What is the acceleration of the train?

Vi = ? Vf = ? T = ?

A train traveling at 10 m/s slows down to a complete stop in 20 s. What is the acceleration of the train?

a = 0 m/s - 10 m/s 20 s

a = -10 m/s 20 s

a = -.5 ms2

a = - 1 m/s 2 s

Velocity Time Graphs

Velocity –Time Graph : Shows how velocity and acceleration change with time

Slope of the line represents acceleration

Constant Positive Acceleration

Object is speeding up by the same amount each second

Constant Negative Acceleration

Object is slowing down by the same amount each second

No Acceleration

Object is cruising at a constant velocity without changing direction OR object is at rest

Acceleration not Constant

Velocity is changing inconsistently