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Conceptual Physics

Conceptual Physics. Notes on Chapter 10-11 Center of Gravity & Rotational Mechanics. Center of Gravity & Rotational Mechanics. Every object will rotate about a central point… CENTER OF GRAVITY . Note: Also known as CENTER OF MASS. Center of Gravity & Rotational Mechanics.

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Conceptual Physics

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  1. Conceptual Physics Notes on Chapter 10-11 Center of Gravity & Rotational Mechanics

  2. Center of Gravity &Rotational Mechanics • Every object will rotate about a central point…CENTER OF GRAVITY. • Note: Also known as CENTER OF MASS

  3. Center of Gravity &Rotational Mechanics • How to find the Center of Gravity (CG). • All of an objects mass actsas if it were concentrated at it’s center. • If you suspend any object, then draw a line beneath. Repeat until you get two lines that cross.

  4. Center of Gravity &Rotational Mechanics • Toppling • An object will topple over only when the CG extends beyond the base of support.

  5. Center of Gravity &Rotational Mechanics • Stability • The closer the CG is to the base (ground), the more stable an object is said to be.

  6. Center of Gravity &Rotational Mechanics • Center of Gravity on People

  7. Center of Gravity &Rotational Mechanics • TORQUE • Torque is simply a turning force. • Open a door knob • Tighten a nut with a wrench • Using a Hammer.

  8. Center of Gravity &Rotational Mechanics • A torque is produced when a force is applied with Leverage. • Leverage is what is used to apply a force to an object. • This force is applied through the LEVER ARM.

  9. Center of Gravity &Rotational Mechanics TORQUE • TORQUE = FORCE X LEVER ARM • So the same torque can be produced by a large force and a short lever arm … or small force with a large lever arm.

  10. Center of Gravity &Rotational Mechanics • Ever try pull a nail with a small or large hammer? Which is easier? Why?

  11. Center of Gravity &Rotational Mechanics • Angular Momentum • Angular Momentum is like Linear Momentum – has a vector quantity and magnitude. • Angular Momentum = Rotational inertiaxRotational velocity • Angular Momentum = massxvelocity • Angular Momentum = Iω • Angular Momentum = mvr

  12. Center of Gravity &Rotational Mechanics CONSERVATION OF ANGULAR MOMENTUM • If no unbalanced external torque acts on a rotating system, the angular momentum of that system is constant.

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