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Projectile motion and V f vertical velocity Tuesday, December 2, 2014

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Monday, 12/1 Unit 5: Projectile Motion Pick up warm-up from the ‘Physics bin’ Make note of upcoming dates below. Warm-up question for today is on your warm-up sheet. Upcoming dates Thursday, 12/4 – Projectile motion quiz Thursday, 12/4 – exemption window opens Thursday, 12/4 – Review due when the late bell rings Monday, 12/8 – Projectile motion test Wednesday, 12/10 – exemption window closes Friday, 12/12 – 3SW extra credit due Thursday, 12/18 – 5 th period final: 11:25 am to 12:45 pm Friday, 12/19 - 8 th period final: 11:25 to 12:45 am Friday, 12/19 – end of the semester

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Warm-up Use the graph to the left to answer the questions below. 1.What value is represented on the y-axis? 2.What value is represented on the x-axis? 3. In order to maximize the range of the projectile, the object should be launched at ______ degrees.

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Horizontal Projectile What we know A projectile has two dimensions to it’s motion. Horizontal Vertical The initial velocity (V i ) in the horizontal is a value that is given to us or we can calculate it. The initial velocity (V i ) in the vertical is always zero.

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Horizontal Projectile What about Final Velocity? Watch animation http://www.physicsclassroom.com/ mmedia/qt/vectors/prehlp.cfm

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Horizontal Projectile – Velocity Horizontal Velocity There is no force acting on the object horizontally therefore inertia applies and the horizontal velocity remains constant. There is no change in velocity therefore there is no acceleration. What do you think the final horizontal velocity would be just before it hits the ground?

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Horizontal Projectile – Velocity Vertical Velocity When the projectile is launched there is no initial vertical velocity. After the projectile is launched the force of gravity starts to have an affect on the vertical motion of the object. The objects starts to accelerate (velocity is changing). The velocity starts to increase. What do you think the final vertical velocity of an object would be just before it hits the ground?

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Final Velocity Example: Use the information in the table to calculate final velocity. Horizontal Velocity Vertical Velocity ∆x = 9.2∆y = 11.47 m V i = 6 m/sV i = 0 m/s a = 0 m/sa = 9.8 m/s t = 1.53 s

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Practice with your elbow partner

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Horizontal Projectile Explore http://www.gcisd- k12.org/cms/lib4/TX01000829/Centricity/Do main/2851/Linear Motion/2D Motion/Mythbusters Bullet Drop.wmv

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Project

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Review

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