And other weird, wild stuff.

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Presentation transcript:

And other weird, wild stuff. Fc and Fg And other weird, wild stuff.

Circular Motion Uniform Circular Motion Movement of an object around a fixed radius Also at a fixed speed. Does an object going around in a circle accelerate? YES! It changes direction constantly!

B. Direction is important If the object is going in a circle, what direction does the acceleration go? R Ac P.S. Ac and Vc are at 90° r Vc TOWARDS THE CENTER! ALWAYS, ALWAYS, ALWAYS!

C. FORMULAS Vc = 2πr Vc is called centripetal velocity ac = vc2 r ac is called centripetal acceleration

II. Centripetal Force According to Newton’s 2nd Law F= ma So, Fc = mac Or, Fc = mvc2 r Centripetal Force ALWAYS goes toward the center due to Newton’s 2nd Law.

III. Centrifugal Force A “fake” force. You are in a ride that goes in a circle. You feel like you are pushing against your seat. You are not It is your intertia……it is not a force

IV. Law of Gravitation Bob Newton Came up with it. The myth was he was hit in the head with an apple. Didn’t use an apple, used the moon. The moon is falling to Earth due to gravity The Earth is being pulled to the moon with the same gravity Why? NEWTON’S 3rd Law Newton found out that the gravity is dependent upon the mass of the two objects and the distance between them.

B. FORMULA Fg = Gm1m2 r2 m1 and m2 are the masses of the two objects By the way, This equation works anywhere in the universe. Fg = Gm1m2 r2 m1 and m2 are the masses of the two objects r is the distance between the centers of the two objects. G= gravitational constant = 6.67 x 10-11

C. Example What is the force of gravity (weight) of a 10 kg dog on Earth? (I would like you to do this 2 different ways.) You are going to need the following info: g = 9.8 m/s2 Mass of Earth = 5.97 x 10 24 kg Radius of earth = 6378000 m