Motion 11.1 Distance and Displacement

Name: ____________________________ Class: ____Motion11.3 Acceleration

Chapter 11

What are we going to learn?

•What is acceleration?

•How to calculate acceleration andinterpret speed vs. time graphs

Acceleration

•____________ at which _______________ changes

Acceleration

•Can be described as ____________ in: ___________,________________, or _________

•It is a ___________

•2 types: ______________ and _________________

•This ____________ may be due to either an increaseor a decrease in _____________

•___________: _________________ change in speed

Constant Acceleration

•A _____________ change in ________________

–If the ____________ increases, the_________________ is ______________ so______________________ is positive

–If the velocity _______________, the numerator is______________ so ____________________ isnegative

Free Fall

•_______________ of an object __________________solely because of _____________

•Due to ______________________________

•_________ of change in ____________ is 9.8 metersper second per second (_______________)

Changing Direction

•___________________ may be due to its______________ constantly _______________ eventhough it is traveling at ______________________

•Ex: horse on a carousel

Changing Direction & Speed

•Sometimes ____________ is changing in both__________ and _______________ at the same time

•Ex: skier on a downhill run

Acceleration Calculation

•Calculation for ___________________ motion: dividethe ___________________ by the _______________

•This equation defines the ____________ acceleration

•A ___________ in velocity by a ___________ amounteach ___________ (its ____________ changes by aconstant ___________ each second)

Acceleration Graphs

•Acceleration is the slope of a speed-time graph

•In a __________ graph, the displayed data form_______________________ parts

•In a ________________ graph, a ___________connects the data points that are plotted

Instantaneous Acceleration

•How fast a ______________ is __________________at a specific _____________

Example

•A snow skier is traveling at 15 m/s at one instant andat 22 m/s 2 seconds later. What is her acceleration?

____________________________________________

•If she maintains this constant acceleration, how fastwill she be traveling one second later?

____________________________________________

Acceleration Graph

Acceleration

is a change in

is measuredin units of

Questions...

•The rate at which velocity changes is called_____________________.

•In terms of speed and direction, in what ways can anobject accelerate? _______________________________________________________________________

•Because acceleration is a quantity that has bothmagnitude and direction, it is a(n) ______________.

•True or false? Acceleration is the result ofincreases or decreases in speed. ____________

•Ignoring air resistance, a rock in free fall will have avelocity of ________ after 4.0 seconds.

•A horse on a carousel that is moving at a constantspeed is accelerating because _____________________________________________________________

•Write the equation used to calculate the accelerationof an object . ________________________________

•True or false? When the final velocity is less than theinitial velocity of an object, the acceleration isnegative. ___________________________________

•A skateboarder begins down a ramp at a speed of 1.0m/s. After 3 seconds, her speed has increased to 4.0m/s. Calculate her acceleration.

a. 1.0 m/s2b. 3.0 m/s2

c. 5.0 m/s2d. 9.8 m/s2

•Graph A represents the motion of adownhill skier. How fast was the skier moving aftertraveling down the hill for 2.5 seconds?

_____________________________________________

•In which graph does an object move at constant speedduring the first 4 seconds? _____________________

•Graph B represents the motion of a mountain biker.What is the biker’s speed at times of 10 s and 20 s?

_____________________________________________

•Determine the acceleration of the mountain bikerduring the 10 second to 20 second time period. Showyour work.

_____________________________________________

•The plotted data points representing acceleration in adistance-time graph form a(n) __________________.

•The measure of how fast a velocity is changing at aspecific instant is known as__________________________________________.