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Ch. 10 – Circular Motion

Ch. 10 – Circular Motion. I. Rotational, Linear and Tangential Speeds. A. Tangential speed (v):. Linear speed (distance / time) in a circular motion. B. Rotational speed (w):. Rotations in a given time (rpms). C. As the distance from the center of a circle (radius) changes,.

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Ch. 10 – Circular Motion

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  1. Ch. 10 – Circular Motion I. Rotational, Linear and Tangential Speeds A. Tangential speed (v): Linear speed (distance / time) in a circular motion B. Rotational speed (w): Rotations in a given time (rpms) C. As the distance from the center of a circle (radius) changes, the tangential speed will change (direct), but not the rotational speed - (double radius – tangential speed will double, rotational speed will stay the same) -

  2. II. Centripetal Force: Force that causes objects to move in a circular path III. Centrifugal Force: Within a system, the force felt toward the outside of a circle… NOT A TRUE FORCE, It’s actually Inertia!!! A spinning space station could be used to simulate gravity in space!!!

  3. Ch. 11 – Rotational Equilibrium When objects are thrown through the air, they will rotate around the CG I. Center of Gravity (CG) or Center of Mass: The average position of weight or mass of an object II. Stability: CG must be over an object’s base to be stable… Objects will tip over and fall to lower (and stabilize) their CG A. Changing the CG: Objects tend to lower their CG, raising it requires work B. An iceberg’s CG will be far below the surface C. CG of people: Generally higher for men than women… Use a plumb bob to find CG of irregular objects! 

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