The Yo-yo. A yo-yo is made from two uniform disks, each with mass m and radius R, connected by a light axle of radius b. A light, thin string is wound several times around the axle and then held stationary while the yo-yo is released from rest, dropping as the string unwinds. Find the linear acceleration and angular acceleration of the yo-yo and the tension in the string.

Lecture 3 VECTORS In 1 dimension, we use + or – to indicate direction of a vector In 2 or 3D we need more than just a sign to indicate direction, such as an angle We express vectors as arrows, there the tail of the arrow is where the vector starts and the tip is where it ends. The length of the arrow represents the magnitude of the vector and the direction of the arrow represents the orientation of the vector Ay A Ax = Acosϴ Ay = Asin ϴ A = √Ax^2 = Ay^2 Ax Unit vector of a = (Axi + Ayj + Azk) position r = xi + yj + zk length r = √x^2 + y^2 + z^2 unit vector = x/r + y/r +z/r **If we have a magnitude for th