nlec07

# nlec07 - Lecture 7 P112 Feb 4 2008 Agenda for today...

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Lecture 7 P112 Feb 4, 2008

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Agenda for today: Projectiles: Motion in 2D and 3D Projectile is a body that is given initial velocity and follows a path (“trajectory”) determined entirely by gravitational acceleration. We will neglect air resistance! Review: Relative Motion Q
A walker and a boater each travel a round-trip near the shore of a river from pier A to pier B and then back to A. The walker’s speed v is constant. The boater travels at the same constant speed v relative to the river. Whose round-trip takes less time? (1) Walker (2) Boater (3) Both take the same time.

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1. A 2. B 3. They hit at the same time Demo: one ball is dropped straight down, while the other is rolled off the platform. Which hits first? A B
Projectile motion is two-dimensional The key to analyzing projectile motion: Treat it as a combination of horizontal motion with constant velocity and vertical motion with constant acceleration! Separate equations for x and y

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## This note was uploaded on 04/16/2009 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell.

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nlec07 - Lecture 7 P112 Feb 4 2008 Agenda for today...

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