Projectile Motion Examples Quiz Demo: Bring both projectile launchers Outline Demo: Bring both projectile launchers

What is a Projectile? 2-D motion in “free fall” is called projectile motion moves in two dimensions (2-D) only force is gravity (free fall) we ignore air resistance !

Projectile motion Using: ax= 0, ay = –g = -9.8 m/s2 y Equations of Motion Projectile motion Using: ax= 0, ay = –g = -9.8 m/s2 y We came up with this set of equations: vo ay x

QQ50:Galileo Worked Ex Example: If you throw a ball at a speed of vo = 8m/s and an angle of 45o to the horizontal, what are the x and y velocity components of the ball ? y q vo x Have student stand next to where ball hits. Change angle to show that 45 deg is the max. Then move it to 55 deg, have student stand there, and go to 35 degrees.

QQ50:Galileo Worked Ex Example: If you throw a ball at a speed of vo = 8m/s and an angle of 45o to the horizontal, what is the velocity of the ball after 2 seconds ? y q vo x Have student stand next to where ball hits. Change angle to show that 45 deg is the max. Then move it to 55 deg, have student stand there, and go to 35 degrees.

QQ50:Galileo Worked Ex Example: If you throw a ball at a speed of vo = 8m/s and an angle of 45o to the horizontal, what is the position of the ball after 2 seconds ? y q vo x Have student stand next to where ball hits. Change angle to show that 45 deg is the max. Then move it to 55 deg, have student stand there, and go to 35 degrees.

Extra Derivation: Max h, Time and Range

Do for next class: Read: Sections 6.4 Suggested problems : 6.13, 6.16