Lecture 6 Post

# Lecture 6 Post - Lecture 6 Friday 2 September 2011 Chapter...

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Lecture 6 Friday 2 September 2011 Chapter 3: Motion in Two or Three Dimensions Projectile motion with no air friction -- The motions along the x - and y -axes are independent ** The x -axis velocity component is constant ** The motion along the y -axis is the same as for an object moving vertically under the influence of gravity -- The trajectory ( y versus x ) of a projectile is a parabola • The solutions to the written and online homework sets #1 are posted. Go over the solutions • Review the posted lecture slides: examples and clicker probs • Use the Physics 221 Help Room and Supplemental Instruction

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The cannon ball takes ___ seconds to reach the top of its trajectory after it is launched. 1. 1.0 2. 2.0 3. 3.0 4. 4.0 Question A cannon ball is launched from ground level at an angle of 30˚ above the horizontal at a speed of 40 m/s. Use g = 10 m/s 2 . Solution The time t that the ball takes to reach its maximum height is governed by its vertical motion. The vertical component of the
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Lecture 6 Post - Lecture 6 Friday 2 September 2011 Chapter...

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