One mass pulls another across a table using the horizontal version of this device.
A nearly massless one of these objects is used to hold the weights for an Atwood machine. One mass pulls another across a table using the horizontal version of this device. A single fixed-axis one has a mechanical advantage of 1, while adding more of them will often increase the mechanical advantage if friction is ignored. For 10 points, name this simple machine that uses an axle and a rope to lift objects.
A nearly massless one of these objects is used to hold the weights for an Atwood machine.
{pulley} [or {sheave}]