This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Lecture 5 Kinematics and Gravity Last time • Displacement: Δ x = x fx i x is deFned as the position compared to the origin • Average Velocity: • Instantaneous Velocity v=dx/dt At a given instant, is the slope of the tangent line in the positiontime graph • Average Acceleration: a avg = Δ v/ Δ t • Instantaneous Acceleration a = dv/dt At a given instant, is the slope of the tangent line in the velocitytime graph t x x t x v i f average Δ − = Δ Δ = Last time • Instantaneous Acceleration a = dv/dt At a given instant, is the slope of the tangent line in the velocitytime graph Time derivatives – Why should we care? • As you may see in your studies, there is information encoded in the rate of how a system changes and the acceleration of change Acceleration Example For many years Colonel John P. Stapp, USAF, held the world’s land speed record. He participated in studying whether a jet pilot could survive emergency ejection. On March 19, 1954, he rode a rocketpropelled sled that moved down a track at 632 mi/h. He and the sled were safely brought to rest in 1.40s. (a) Determine the negative acceleration he experienced. Acceleration Example = ( − 632 miles / hr ) 1.4 s ⋅ 1 hr 3600 s ⋅ 1609.3 m 1 mile Lets put this in terms of units of gravity so we can understand the “gforces” the Colonel experienced…...
View
Full Document
 Spring '11
 e
 Acceleration, Velocity, Colonel John P. Stapp, Colonel Dapper

Click to edit the document details