Projectile Motion Seo Physics

Projectile Motion What is a Projectile Motion? Any object that continues in motion and is influenced only by gravity an object thrown straight upward is a projectile an object thrown upward at an angle to the horizontal an object dropped from rest is a projectile

Vertical Direction (aka. Free Fall)  

Vertical and Horizontal Motion Vertical Motion Velocity = Vx Displacement = Δx Velocity = Vy Displacement = Δy Vx is always constant Gravity acts vertically, a = -9.8 m/s2

t=0.247 s Practice Problem vix=72.9 m/s vix=? m/s viy= 0 m/s A basketball rolls across a 18.0 m pitch. The ball drops 0.3 m from the edge. Determine the ball’s speed? How long did it take to roll over the pitch?     vix=? m/s viy= 0 m/s     t=0.247 s t=? s         t=0.247 s vix=72.9 m/s

Simplified Projectile Equation Horizontal Motion Vertical Motion

Cliff example A boulder rolls off of a cliff and lands 6.39 seconds later 68 m from the base of the cliff. What is the height of the cliff? Δy= ? a=-9.81 m/s2 t = 6.39 s Vx=? Vy,i = 0 Δx= 68 m

Problem (Con.) What is the velocity of the boulder just as it strikes the ground? The boulder rolls off the cliff horizontally Therefore, we are looking for Vx

Projectile Motion Review Horizontal Components Vertical Components Horizontal Velocity is constant throughout the flight Horizontal acceleration is 0 Initial vertical velocity is 0 Vertical acceleration is constant: -9.81 m/s2