Warm Up # of sig figs 1.020 0.00410 120 144.0 4.0 x103 AP Physics Tuesday 14.09.02 Standards: Kinematics 1D & 2D: Big Idea 3 Learning Objective: SWBAT measure the acceleration due to gravity. Agenda: Warm Up Review HW Sig Figs Final Questions Lab: Measuring Gravity with a Ruler Homework KAP #2

Warm Up Find the average speed of a donkey running from a dog if it takes the donkey 2 minutes to run 1.3 km. AP Physics Wednesday 14.08.26 Standards: Kinematics 1D & 2D: Big Idea 3 I –Independent Resilient Individuals RST.11-12.9 Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,… Learning Objective: SWBAT collect data and find their reaction time using the fact that gravity accelerates objects downwards Agenda: Warm Up Review HW KAP1&2 Reflection: acceleration due to gravity lab reaction time lab 3. Homework KAP#3 Homework KAP#3

Warm Up If you measure how long it takes for an object to fall 4 m, and you get 0.014s, but your reaction time is 0.15s, what can you say about the certainty of your measurement? AP Physics Thursday 13.09.04 Standards: Kinematics 1D & 2D: Big Idea 3 I –Independent Resilient Individuals RST.11-12.9 Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,… Learning Objective: SWBAT collect data and find their reaction time using the fact that gravity accelerates objects downwards Learning Objective: SWBAT analyze situations involving a constant acceleration Homework KAP#4 Agenda Warm up Review HW Review Reaction Time Lab

AP Physics Friday 13.09.05 Standards: Kinematics 1D & 2D: Big Idea 3 RST.11-12.4 Meaning of symbols, key terms, technical jargon Problem Solvers Objective: SWBAT graphically represent displacement, velocity, and acceleration Warm Up Find the initial speed of an ostrich if it traveled 900 m while accelerating at 3 m/s2 and ended up traveling at a speed of 22 m/s. Agenda Warm Up Stamp HW graphically representing velocity and acceleration lab Homework K#5

KAP #1 Study Significant Figures from your book on your own. Answer the following questions: pg. 19 9,10,11,13,14 Come on Tuesday ready to ask questions (We do not have time to spend a whole class on them, so when studying significant figures you should be able to answer the following questions if you’ve done a good job. What are they? What does the book mean by a significant figure? When are significant figures used? What benefits do using significant figures give to scientists and science students? How are they used? (How do you use them in problem solving?) 9. a. 797 b. 1.14 c. 17.66, 10. a) 3.00 x108m/s b. 2.9989x108 m/s c. 2.997925 x108 m/s 11. 115.9 m 13. 228.8 cm 14. a. 2.96x107 b. 6.786x10-2 When doing measurements, those measurements are only as precise as the instrument you are using, but when you put numbers into the calculator, you get very long strings of numbers. Numbers often fill the screen. So at what point do you round? This is what significant figures tell you. Based on the measuring tools you used, what is the precision of your measurement. Does it have 1,2,3,4 or more significant figures? The book says it is a reliably known digit. Anytime that you are working with a number that you measured yourself or a number that represents a measured value (a.k.a book problems) It tells us where our knowledge stops. It gives us the spot that separates numbers we know for certain with numbers that we don’t. rules: 1. all non zero numbers are significant. 2. Zero’s before other numbers are not significant (placeholder numbers (0.0012, 0101) also the placeholder zeros in whole numbers 1200, 400, 141,000.

kAP #2 The fastest fish, the sailfish, can swim 1.2x102 km/h. Suppose you have a friend who lives on an island 16 km away from the shore. If you send a message using a sailfish as a messenger, how long will it take for the message to reach your friend? An ostrich can run at speeds of up to 72 km/h. How long will it take an ostrich to run 1.5 km at this top speed? A cheetah is know to be the fastest mammal on Earth, at least for short runs. Cheetahs have been observed running a distance of 5.50x102 m with an average speed of 1.00x102 km/h. How long would it take a cheetah to cover this distance t this speed? Suppose the average speed of the cheetah were just 85.0 km/h. What distance would the cheetah cover during the same time interval calculated in (a)? 4. The peregrine falcon is the fastest of flying birds (and, as a matter of fact, is the fastest living creature). A falcon can fly 1.73 km downward in 25 s. What is the average velocity of the peregrine falcon? pg. 3 Holt: 1. (Ex.) 8.0 min 2 (#2) 0.021 hr. 3(#3) a. 0.00550 hr b. 0.468km 4 (#6) 0.0692 km/s downward

KAP #3 : p. 46 1,,4,7,8, 11 p.47 1, 3, 6 yes, a-> delta v 4. Light travels very very fast, must faster than sound. It comes to us basically instantly. 7 same accelerations. if the vo is horizontal they will drop at the same rate, the one with vo will make a parabola 8. c,a, b 11. a. 9.8 m/s2 down, 0 m/s b. 9.8 m/s2 down 1. a. 52.9 km/h b. 90 km 3, boat a wins by ½ hour , 60 km/hr 6.a 5m/s, 1.25 m/s, 0m/s, 1m/s

KAP #4 constant acceleration Problems In 1986, the first flight around the globe without a single refueling was completed. The aircrafts average speed was 186 km/h. If the ariplane landed at this speed and accelerated at -1.5 m/s2, how long did it take fo the airplane to stop? Some tropical butterflies can reach speed of up to 11 m/s. Suppose a butterfly flies at a speed of 6.0 m/s while another flying insect some distance ahead flies in the same direction with a constant speed. The butterfly then increases its speed at a constant rate of 1.4 m/s2 and catches up to the other insect 3.0 s later. How far does the butterfly travel during the race? Stetching 9345 km from Moscow to Vladivostok, the Trans-Siberian reailway is the longest single railroad in the world. Suppose the train is approaching the Moscow station at a velocity of +24.7 m/s when it begins a cosntant acceleration of -0.850 m/s2 . This acceleration continues for 28s. What will be the trains final velocity when it reaches the station. p.10,11 1 (#1) 34s 2 (#6) 24m 3 (#10) +0.2 m/s

KAP #5 AP Physics B FRQ on separate sheet.

Representing velocity and acceleration Graphically Step 1: Repeat 2 of your most recent labs with slight modifications. a) Tumblebuggy speed lab b) Penny drop gravity lab Modifications: Track the position of the car and penny as they move. You can do this using the lap feature on your phone. Do multiple trials and average them for better data. Step 2: Record your data in tables. Create your own. In each table begin with displacement (m), time (s) Step 3: Pick 5 points on your best fit curve of your displacement vs time graph and find the instantaneous velocity at that instant (slope of the tangent line). Step 4: Graph velocity vs. time. Step 5: Pick 5 points on your best fit curve of your velocity vs. time graph and find the instantaneous velocity at those points (slope of the tangent line) Step 6: Graph Acceleration vs. time Hint: You can check your work if you have a graphing calculator and you enter your displacement vs time data.