8.01 Lecture Notes - Lecture 1: Angular Acceleration, Rotation Around A Fixed Axis, Cross Product
Document Summary
Rigid body: an extended object in which the distance between any two point in the object is constant in time. Effect of external forces on a rigid body: they translate and rotate. Torque about center of mass produces angular acceleration about the center of mass is the moment of inertia about the center of mass is the angular acceleration about the center of mass. Magnitude of torque about point s due to the force exerted at point p. Torque diagram: draw all external forces at the point where they are acting, identify the point s where we are calculating the torque, draw r for each force. Draw a curved arrow from r to f (tail to tail) and use right hand rule. The way your thumb is pointing is the direction of torque. How can vectors a and b de ne a new vector c up to a direction: magnitude of c, direction of c.
