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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.
 Fall '06
 GREGG

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