EXAMPLE 2: KINEMATICS OF RIGID BODIES

Calculate the velocity of point A given that the cart is moving with a constant speed as shown and the disc is rotating such that , where is a constant.

SOLUTION:

Position of A relative to fixed point B is

Point O moves with the cart, therefore

The length of is constant, therefore

Since point B is stationary, is the velocity of B. Substitution into (1) gives