7.2 Angular & Linear Speed.

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Presentation transcript:

7.2 Angular & Linear Speed

Angular & Linear Speed Object moves in circular path, 2 speeds involved - rate of distance traveled - rate object revolves @ center of circle (linear) s (angular) Linear speed: t = time  radians r Angular speed:

Angular & Linear Speed Linear speed: Angular speed: Arc length:  Relates linear & angular speed

Get rid of all units on top to get “radians” (radians don’t have units) Example 1 Linear speed A car has wheels that are 28 inches in diameter & is traveling at 45 mph. Find angular speed in radians per minute. Diameter = 28 Radius = ½(28) = 14 Linear speed Angular speed Convert to radians per minute

Homework #711 Pg. 396 45, 46, 49, 50, 51 Pg. 472 1 – 7 all