# L13 - Remember:ThisWeek&amp;Upcoming...

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Remember: This Week & Upcoming Finish reading Ch. 4 on Newton’s Laws & applicaAons. Recita’on 3 this week : Print the RecitaAon ±ssignment and bring to RecitaAon/Lab session. CAPA assignment #5 is due Friday evening at 10 PM, to be done on‐line. L13 W 2/10/10 1 Physics 2010

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L13 W 2/10/10 Physics 2010 2 x y θ Monkey and the Hunter v o H X What’s the angle θ to hit the monkey? y monkey = y bullet at x = X. y monkey = H 1 2 gt 2 y bullet = v 0 y t 1 2 gt 2 t ( X ) = X / v 0 x y monkey = y bullet H 1 2 gt 2 = v 0 y t 1 2 gt 2 H = v 0 y t = v 0 y X v 0 x = X v 0 sin θ v 0 cos = X tan tan = H X Aim right at the monkey! Time for the bullet to get to x=X .
L13 W 2/10/10 Physics 2010 3 Dynamics: Newton’s Laws of Motion Newton’s Laws hold in an “Inertial Reference Frame”. I. “Law of Inertia”: Every object continues in its state of rest, or uniform motion (constant velocity in a straight line), as long as no net force acts on it. II. Acceleration is proportional to force and inversely proportional to mass : III.Whenever one object exerts a force on a second object, the second exerts an equal force in the opposite direction on the ±rst: F  net = ma F AB = F BA

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L13 W 2/10/10 Physics 2010 4 A glider is gliding along an air track at constant speed. There is no friction (assume that the air resistance is small enough to ignore). What can you say about the net force (total force) on the glider? B) The net force is non-zero and is in the direction of motion. C) The net force is non-zero and is in the direction opposite the motion.
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## This note was uploaded on 08/24/2010 for the course PHYS 2010 taught by Professor Dubson during the Spring '06 term at Colorado.

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L13 - Remember:ThisWeek&amp;Upcoming...

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