Multi-mode scroll wheel for input device

A computer mouse, comprising:

• a displacement sensor configured to detect movement of the computer mouse relative to a work surface;
• a scroll wheel configurable to rotate around an axis in a plurality of operation modes, wherein:
• the plurality of operation modes includes a freewheel mode, a constant friction mode, and a ratchet mode;
• and
• the scroll wheel is configurable to receive a respective unique friction profile for each of the plurality of operation modes;
• an actuator assembly configured to set the scroll wheel to each of the plurality of operation modes;
• and
• a friction applying assembly comprising a first member and a second member, wherein:
• the first member is coupled to or included in the scroll wheel;
• the second member is coupled to or included in the actuator assembly;
• and
• the second member is configurable to mechanically or electromagnetically apply the respective unique friction profile for each of the plurality of operation modes.