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Projectile motion. Free-falling while moving horizontally. Moving in two directions at the same time. Projectile motion. Parabolic trajectory. Vertical motion: with acceleration of -9.8 m/s 2 and initial velocity v y and vertical displacement Δy

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## Projectile motion

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**Projectile motion**Free-falling while moving horizontally Moving in two directions at the same time**Parabolic trajectory**Vertical motion: with acceleration of -9.8 m/s2 and initial velocity vy and vertical displacement Δy Horizontal motion: constantvx and horizontal displacement Δx**Lab – Launching a Projectile Horizontally**• Work in pairs • Each person should have his / her set of data • Each student turns in a report with his / her name on it.**Projectile Launched at an angle**Projectile has initial velocity in both directions**Example**• A football is kicked 22 m/s at 40o to the horizontal. Calculate the maximum height and horizontal range the football will reach before it falls down (providing no one catches it).**Example 2 (p.110, #35)**• A place kicker must kick a football from a point 36.0 m from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 20.0 m/s at an angle of 53° to the horizontal. • a. By how much does the ball clear or fall short of clearing the crossbar? • b. Does the ball approach the crossbar while still rising or while falling?

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