Ch. 11 Motion II. Describing Motion Motion Speed & Velocity Acceleration A. Motion Problem: Is your desk moving? To describe motion completely, we need a frame of reference a
system of objects that are not moving with respect to one another. A. Motion Relative Motion Movement in relation to a frame of reference. Reference point Motion Quick Write Explain a time where you experienced confusion about
your motion. Measuring Distance Distance the length of a path between two points. Units m (meters) km (kilometers) cm (centimeters) Measuring displacement Displacement is independent of the path taken by the object.
Involves the starting point, ending point, and direction. Vector quantity Example: A man travels 4 blocks North and then returns 4 blocks South. What is his displacement? B. Speed & Velocity Speed d rate of motion v t distance traveled per unit time distance speed
time B. Speed & Velocity Instantaneous Speed speed at a given instant Ex. The speed measured by a police officer using a radar gun Average Speed speed over an entire trip total distance avg. speed
total time __ v = d t B. Speed & Velocity Velocity speed in a given direction can change even when the speed is constant! Velocity Problems Graphing d/t
E. Graphing Motion Distance-Time Graph slope A = speed steeper slope = faster speed B
straight line = constant speed flat line = no motion E. Graphing Motion Distance-Time Graph Who started out faster? A (steeper slope) Who had a constant speed? A
Describe B from 10-20 min. B stopped moving A B Find their average speeds. A = (2400m) (30min) A = 80 m/min B = (1200m) (30min) B = 40 m/min Acceleration
C. Acceleration vf - vi a t Acceleration the rate of change of velocity change in speed or direction a v f vi a: acceleration
vf: final velocity t vi: initial velocity t: time C. Acceleration Positive acceleration speeding up Negative acceleration slowing down
Quick Write Given an example of something that you have seen in your daily life that is accelerating. Describe its motion. D. Calculations A roller coaster starts down a hill at 10 m/s. Three seconds later, its speed is 32 m/s.
What is the roller coasters acceleration? GIVEN: WORK: vi = 10 m/s a = (vf - vi) t t=3s vf = 32 m/s a = (32m/s - 10m/s) (3s) a=? vf - vi
a t a = 22 m/s 3 s a = 7.3 m/s2 D. Calculations How long will it take a car traveling 30 m/s to come to a stop if its acceleration is -3 m/s2? GIVEN: WORK: t=? vi = 30 m/s
t = (vf - vi) a t = (0m/s-30m/s)(-3m/s2) vf = 0 m/s a = -3 m/s2 vf - vi a t t = -30 m/s -3m/s2 t = 10 s E. Graphing Motion Distance-Time Graph 400
Acceleration is indicated by a curve on a Distance-Time graph. Distance (m) 300 200 100 Changing
0 0 5 10 Time (s) 15 20 slope = changing velocity
E. Graphing Motion Speed-Time Graph = acceleration +ve = speeds up -ve = slows down slope 3 Speed (m/s) 2 straight
line = constant accel. 1 line = no accel. (constant velocity) flat 0 0 2 4
6 Time (s) 8 10 E. Graphing Motion Speed-Time Graph Specify the time period when the object was... slowing down 5 to 10 seconds speeding up 0 to 3 seconds
3 Speed (m/s) 2 moving at a constant speed 3 to 5 seconds not moving 0 & 10 seconds 1 0
Lesson 1.5 Angle Relationships Geometry CP Mrs. Mongold Adjacent Angles Vertical Angles Linear Pair Examples Name a linear pair Examples Name vertical angles Examples Name adjacent angles Special Note on Vertical Angles Complementary Angles Supplementary Angles Homework Pg 45/ 8-13...
Regional Geography of The United States & The World Understanding Economics Though Geography What & Why We Are Doing This… U.S. Students have poor geography skills In Economics, you need to understand where people and products come from and where...
What does it mean to be radical? Who or what do you associate with radicals? France's Political Spectrum War Many European nations feared revolutions similar to the one in France Prussia & Austria (the queens home country) want French to...
Sediments evolve from fine-grained turbidites to shallow water continental seds over time ISOSTASY TECTONIC BASINS Sedimentary Basin = area of thick sediment accumulation To accumulate seds, must either raise sea level or cause underlying lithosphere to subside SUBSIDENCE MECHANISMS Subsidence...
These improvements in development and adult success have implications for public expenditures resulting in cost savings in education, social services, the criminal justice system, and health care. Of course, it is not just the government cost savings that are important,...
Writing a Literature Review. Today's date / presenter name / etc. Example layout without background image. ... Methods, Theories, Approaches,Models and Materials ... Critical writing: foregrounding your authorial voice.
The Area Principle. We often use images to compare amounts. Larger images correspond to greater amounts. To use images properly in this way, we must follow a rule known as The Area Principle. The Area Principle. When amounts are compared...
Ready to download the document? Go ahead and hit continue!