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Lecture06_Pushkar

# Lecture06_Pushkar - PHYSICS 220 Lecture 06 Projectile...

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Lecture 6 Purdue University, Physics 220 1 Lecture 06 Projectile Motion Textbook Sections 4.2 PHYSICS 220

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Lecture 6 Purdue University, Physics 220 2 y x 2-Dimensions X and Y are INDEPENDENT! Break 2-D problem into two 1-D problems
Lecture 6 Purdue University, Physics 220 3 Relative Velocity We often assume that our reference frame is attached to the Earth. What happen when the reference frame is moving at a constant velocity with respect to the Earth? The motion can be explained by including the relative velocity of the reference frame in the description of the motion. The ground velocity of an airplane is the vector sum of the air velocity and the wind velocity. Using the air as the intermediate reference frame, ground speed is: Example airplane V(PG)=V(PA) +V(AG)

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Lecture 6 Purdue University, Physics 220 4 iClicker You are on a train traveling 40 mph North. If you walk 5 mph sideways across the car (W), what is your speed relative to the ground? A) >40 mph B) 40 mph C) <40 mph 40 mph N + 5 mph W = 41 mph NW 40 5 | v | = 40 2 + 5 2 θ tan θ = 5 40 θ = 7.1 o
Lecture 6 Purdue University, Physics 220 5 Three swimmers can swim equally fast relative to the water. They have a race to see who can swim across a river in the least time. Relative to the water, Beth (B) swims perpendicular to the flow, Ann (A) swims upstream, and Carly (C) swims downstream. Which swimmer wins the race?

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