Chapter 3

If this car is driving north and the wind is blowing

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Unformatted text preview: No, you must change direction to go in a circle. •  A car can travel at a maximum speed of 200 km/hr. If this car is driving north and the wind is blowing south at 25 km/hr, what is the car’s maximum velocity? v = 200 km/hr N + 25 km/hr S v = 200 km/hr N - 25 km/hr N v = 175 km/hr N -adding vectors here -take velocity of car and add it to velocity of wind -to directly add we need to change them to be the same direction Mythbusters Prove the “Myth” That Velocity Vectors Can Cancel: 2 9/9/13 Acceleration •  Acceleration (a) is the measure of how fast the velocity changes: acceleration = –  Units: m /s/s= change in velocity time interval ( m / s) m = s2 s •  Because velocity is a vector, acceleration is as well! Velocity and Acceleration -usually write it out like m/s/s -can have acceleration just by change of direction -when acceleration is pointing opposite of velocity that means you are slowing down -you can have acceleration and no velocity -speed not direction is changing Problem Solving: Acceleration •  A car goes from 0 m/s to 100 m/s in 2 s. What is its acceleration? a= 100 m/s ! 0 m/s = 50 m/s/s 2s -means you speed up 50 meters per second every second, so after 3...
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This note was uploaded on 10/15/2013 for the course PHSC 1001 taught by Professor Gregg during the Fall '06 term at LSU.

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