10_1425_web_Lec_05_Projectiles

10_1425_web_Lec_05_Projectiles - Projectiles Physics 1425...

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Projectiles Physics 1425 Lecture 5 Michael Fowler, UVa.
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Reminder: Galileo’s Laws of Motion Neglecting air resistance and friction, Galileo claimed: 1. Horizontal motion: (ball rolling on table) an object would continue to move at constant velocity unless pushed. 2. Vertical motion: a falling body would accelerate downwards at a uniform rate .
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Galileo’s Law for Projectiles He asked himself: what would happen if the ball rolled off the table? He claimed (and established experimentally) that the balls uniform horizontal motion would continue as before BUT natural vertical falling motion would be added ! He termed the result “ compound motion ”.
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Here’s Galileo’s own picture … and here’s a link to an animation.
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Equation for the Trajectory Taking t = 0 to be when the ball rolls off the edge, and the origin O at that point, from which The standard parabola equation is y = ax 2 , so this is half of an upside-down parabola. 0
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10_1425_web_Lec_05_Projectiles - Projectiles Physics 1425...

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