Dynamics of Rotational Motion(Chapter 10)

Dynamics of Rotational Motion(Chapter 10)

1. Torque

   • Causes angular acceleration
   • 3 Factors that determine effectiveness
     • magnitude
     • Position
     • Angle
   • Torque = rF
     • N m
   • Torque = rFsinθ

2. If the sum of all torque is 0, objects rate of rotation does not change

   • net torque = sum of all torques
     • Sum of Torques = I(angular acceleration)

3. Torque is a vector quantity

   • Counterclockwise is positive
   • Clockwise is negative
   • When force is parallel to position vector, no rotation occurs

4. Angular Momentum (L)

   • L = I (w)
   • Angular Momentum is conserved
     • Momentum before must equal momentum after
   • Angular Momentum of a Particle
     • L = mvr

5. Equilibrium

   • External Net Force = 0 (Translational Equiibrium)
   • External Net Torque = 0 (Rotational Equilibrium)