Introduction to Kinematics Notes What is Kinematics Equations

Introduction to Kinematics Notes

What is Kinematics? Equations The study of motion The big three kinematics equations of motion Big Dog Symbols Lil Pup Shaggy Cat What does each symbol mean? What about units? df = Final distance (m) do = Original distance (m) vf = Final velocity(m/s) vo = Original velocity(m/s) a = Acceleration(m/s 2) t = Time (s)

Example The runway at Midway Airport is approximately 2000 m long. The takeoff speed of a Boeing 747 aircraft is 180 miles/hour. a. Draw a diagram and set your origin. 0 m 2000 m b. What are the knowns and unknowns? (At least 4!) ? a= df = 2000 m vf =180 mi/hr =84. 5 m/s do = 0 m vo =0 m/s ? t= c. Convert numbers into physics units. 180 mi x __1. 69 km__ x __1000 m__ x ___1 hr_ = 84. 5 m/s 1 hr 1 mi 1 km 3600 s

Example d. Choose an equation with only 1 unknown value. Big Dog Lil Pup Shaggy Cat e. Solve for the unknown. A. Calculate the acceleration of the plane. B. Calculate how much time the plane has to take off. C. How would these values be different if the plane accelerated faster? A. ) Shaggy Cat: 84. 52 = 02 + 2 a(2000 -0) 7140. 25 = 0 + 2 a(2000) 7140. 25 = 4000 a 1. 79 m/s 2 = a B. ) Lil Pup: 84. 5 = 0 + 1. 79 t 84. 5 = 1. 79 t 47. 2 s = t

Example d. Choose an equation with only 1 unknown value. Big Dog Lil Pup Shaggy Cat e. Solve for the unknown. A. Calculate the acceleration of the plane. B. Calculate how much time the plane has to take off. C. How would these values be different if the plane accelerated faster?