Physics 101: Lecture 5, Pg 2 Review from Lecture 4 •Constant Acceleration Equations of Motion x = x0+ v0t + 1/2 at2 v = v0 + atv2= v02+ 2a(x-x0)•SF = m a –Draw Free Body Diagram –Write down equations (which variables do you know, which don’t you know?)–Solve •Today: look at Gravity as force
Physics 101: Lecture 5, Pg 3 Free Fall Only force acting on object is GRAVITY Newton’s 2ndLaw SFy= may Force is Weight = mg (near surface of earth) » SFy= may» -mg = may » ay= -g (- sign tells us it is in –y direction or down). Acceleration is ALWAYS g downwards Position may be positive, zero or negative Velocity may be positive, zero or negative Acceleration is always g downwards y x y = y0+ vy0t - 1/2 gt2 vy= vy0 - gtvy2= vy02- 2g(y-y0)
has intentionally blurred sections.
Sign up to view the full version.