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Rotational Motion, Screenshot (60), Screenshot (83), Screenshot (85), Low…
Rotational Motion
Angular Quantities
l = Rθ
Determining moments of Inertia
For parallel axis :
Perpendicular axis theorem(flat object) :
Torque
force is needed for an object to rotate
Level arm is the perpendicular distance of rotation to the line along which the force acts
τ = RF
Rotational Kinetic Energy
Both rotational and translational kinetic energy should be count if conservation of energy is used
Rotational Dynamics
Rotational inertia depends on mass distribution and axis of rotation
Vector Nature of Angular Quantities
angular velocity direction given by the right-hand rule
Rolling
Rotational + Translational = Rolling
Why does a rolling sphere slow down?
the bottom of sphere will deform
normal force create a torque that slows down sphere
Constant Angular Acceleration
Low Jing Ning A20SC0126
