1. Name: ____________________________ Class: ____ Motion 11.3 Acceleration Chapter 11

2. What are we going to learn? What is acceleration? How to calculate acceleration and interpret speed vs. time graphs

3. Acceleration ____________ at which _______________ changes Acceleration Can be described as ____________ in: ___________, ________________, or _________ It is a ___________ 2 types: ______________ and _________________ This ____________ may be due to either an increase or a decrease in _____________ ___________: _________________ change in speed

4. Constant Acceleration A _____________ change in ________________

5. –If the ____________ increases, the _________________ is ______________ so ______________________ is positive –If the velocity _______________, the numerator is ______________ so ____________________ is negative Free Fall _______________ of an object __________________ solely because of _____________ Due to ______________________________ _________ of change in ____________ is 9.8 meters per second per second (_______________)

6. Changing Direction ___________________ may be due to its ______________ constantly _______________ even though 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

7. Acceleration Calculation Calculation for ___________________ motion: divide the ___________________ by the _______________ This equation defines the ____________ acceleration A ___________ in velocity by a ___________ amount each ___________ (its ____________ changes by a constant ___________ 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

8. Instantaneous Acceleration How fast a ______________ is __________________ at a specific _____________ Example A snow skier is traveling at 15 m/s at one instant and at 22 m/s 2 seconds later. What is her acceleration? ____________________________________________ If she maintains this constant acceleration, how fast will she be traveling one second later? ____________________________________________

9. Acceleration Graph

10. Acceleration is a change in is measured in units of

11. Questions... The rate at which velocity changes is called _____________________. In terms of speed and direction, in what ways can an object accelerate? ____________________________ ___________________________________________ Because acceleration is a quantity that has both magnitude and direction, it is a(n) ______________. True or false? Acceleration is the result of increases or decreases in speed. ____________ Ignoring air resistance, a rock in free fall will have a velocity of ________ after 4.0 seconds.

12. A horse on a carousel that is moving at a constant speed is accelerating because __________________ ___________________________________________ Write the equation used to calculate the acceleration of an object. ________________________________ True or false? When the final velocity is less than the initial velocity of an object, the acceleration is negative. ___________________________________ A skateboarder begins down a ramp at a speed of 1.0 m/s. After 3 seconds, her speed has increased to 4.0 m/s. Calculate her acceleration. a. 1.0 m/s 2 b. 3.0 m/s 2 c. 5.0 m/s 2 d. 9.8 m/s 2

13. Graph A represents the motion of a downhill skier. How fast was the skier moving after traveling down the hill for 2.5 seconds? _____________________________________________ In which graph does an object move at constant speed during 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? _____________________________________________

14. Determine the acceleration of the mountain biker during the 10 second to 20 second time period. Show your work. _____________________________________________ The plotted data points representing acceleration in a distance-time graph form a(n) __________________. The measure of how fast a velocity is changing at a specific instant is known as __________________________________________.