Acceleration Acceleration

Chapter 1, Section 3 Chapter 1, Section 3

Page 22 - 27Page 22 - 27

WHAT IS WHAT IS ACCELERATION?ACCELERATION?

• ____ACCELERATIONACCELERATION__ is the rate at which __ is the rate at which velocity changes.velocity changes.

• Velocity is __Velocity is __SPEED IN A GIVEN SPEED IN A GIVEN DIRECTION__DIRECTION__

• Acceleration refers to __Acceleration refers to __INCREASING INCREASING SPEED__. __DECREASING SPEED__, SPEED__. __DECREASING SPEED__, or or __CHANGING DIRECION__.__CHANGING DIRECION__.

INCREASING SPEEDINCREASING SPEED

• A car that begins to move from a A car that begins to move from a __STOPPED__ __STOPPED__ position or position or __SPEEDS UP__.__SPEEDS UP__.

Increasing speedIncreasing speed

• An example of something increasing speed An example of something increasing speed would be a dude about to get body slammed would be a dude about to get body slammed on the canvas! See belowon the canvas! See below

DECREASING SPEEDDECREASING SPEED

• A car A car __STOPPING____STOPPING__ at a stop sign is called at a stop sign is called ____DECELERATION__DECELERATION__, or negative , or negative acceleration.acceleration.

Decreasing speedDecreasing speed

• An example of something decreasing speed An example of something decreasing speed would be a car locking up it’s brakeswould be a car locking up it’s brakes

CHANGING DIRECTIONCHANGING DIRECTION

• Acceleration can be a change in Acceleration can be a change in __DIRECTION____DIRECTION__..

• Examples: Examples: __TURNING A CORNER__ __TURNING A CORNER__ and and __SWITCHING LANES____SWITCHING LANES__

Changing directionChanging direction

• An example of something changing direction An example of something changing direction would be a loop roller coasterwould be a loop roller coaster

CALCULATING CALCULATING ACCELERATIONACCELERATION

• Acceleration = Acceleration = __FINAL SPEED - __FINAL SPEED - INITIAL SPEED__ /__TIME__INITIAL SPEED__ /__TIME__

• Speed is measured in meters per second Speed is measured in meters per second (m/s) and time is measured in seconds, the (m/s) and time is measured in seconds, the SI unit of acceleration is SI unit of acceleration is __METERS PER __METERS PER SECOND PER SECOND, SECOND PER SECOND, or or M/SM/S22

• Meters per second per second means Meters per second per second means __EVERY SECOND THE SPEED __EVERY SECOND THE SPEED INCREASES BY THE SPEED__INCREASES BY THE SPEED__

GRAPHING GRAPHING ACCELEREATIONACCELEREATION

• The 2 types of graphs that can be used are The 2 types of graphs that can be used are __DISTANCE–VERSUS–TIME and SPEED–__DISTANCE–VERSUS–TIME and SPEED–VERSUS–TIME__.VERSUS–TIME__.

SPEED –

VERSUS – TIME

GRAPH

• The line slants __The line slants __UPWARDS__UPWARDS__ means your means your speed is increasing.speed is increasing.

• __STRAIGHT LINE____STRAIGHT LINE__ means acceleration is means acceleration is constantconstant

• __STRAIGHT and SLANTED LINE__ __STRAIGHT and SLANTED LINE__ mean mean accelerating at a constant rate.accelerating at a constant rate.

• To calculate the slope, choose To calculate the slope, choose __ANY 2 __ANY 2 POINTS ON THE LINE__. POINTS ON THE LINE__. Then, Then, __DIVIDE __DIVIDE THE RISE BY THE RUN__.THE RISE BY THE RUN__.

DISTANCE –

VERSUS – TIME

GRAPH

• A A __CURVED LINE__ __CURVED LINE__ means that an object is means that an object is accelerating.accelerating.