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Projectile Motion. Horizontal and Vertical Motion. Position, velocity and acceleration are vectors. These vectors can be separated into components. Choose x for horizontal Choose y for vertical The equations for constant acceleration can be written separately in each coordinate.

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## Projectile Motion

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**Horizontal and Vertical Motion**• Position, velocity and acceleration are vectors. • These vectors can be separated into components. • Choose x for horizontal • Choose y for vertical • The equations for constant acceleration can be written separately in each coordinate.**Vector Gravity**• The gravitational acceleration is a vector. • The magnitude is 9.8 m/s2. • The direction is down. • If there is only constant gravitational acceleration in the -y direction, the equations simplify for x.**Moving Target**• A target drops as a projectile is fired. To hit the target, the projectile should be aimed • A) Above the target. • B) At the target. • C) Below the target at the point they should collide. • D) Below the target under the point they should collide.**Vertical Pull**• All falling objects are subject to the same gravitational acceleration. • The horizontal component doesn’t affect the downward acceleration.**The initial horizontal velocity doesn’t matter.**All objects fall at the same vertical rate (neglecting friction). At the collision the target fell a distance y = -d. The time it fell comes from the acceleration. Shoot the Monkey**The point of collision measures the distance dropped since**the ball was fired. The time determines the horizontal velocity of the ball. The angle of the launcher gives the total velocity. Horizontal Speed next

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