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Projectiles. What is projectile motion?. Object that is flying through the air and accelerating at -9.80m/s 2 due to gravity There are a few types of projectiles. Horizontal Motion of Projectile.
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What is projectile motion? • Object that is flying through the air and accelerating at -9.80m/s2 due to gravity • There are a few types of projectiles
Horizontal Motion of Projectile • Horizontal motion of a projectile is just like a ball rolling along a table with a constant velocity If there were no gravity, the path would be a straight line
Adding gravity • Let’s say we turn on the gravity- will it affect the horizontal motion? • NO- it will only affect the projectile in a vertical direction! Note horizontal motion is the same!
Horizontal and Vertical Motion • Projectiles often have motion in x and y direction- each is a vector component of the actual velocity and act INDEPENDENTLY of each other
X and Y motion • Notice x remains at constant v while y is accelerating due to gravity
Test your understanding • If a ball rolls off a table with an original horizontal velocity of 0.4m/s, what will be the horizontal component of its velocity when it hits the ground? • 0.4m/s • If I drop a second ball off the table at the same time the original ball rolls off, which will hit the ground first? • Both hit at same time • Let’s look at that…
Both balls are falling same vertical distance with same accelerations, g, so they will hit the ground at the same time!