# Why does an ice hockey stick, when thrown on ice always rotate and translate together before coming to rest? Why not only rotate or only translate?

When a hockey stick is thrown on ice it simultaneously rotates and translates before stopping. Friction probably plays the main role here, along with the shape of the stick. I think maybe it is due to different forces on friction on either side of the Centre of mass, but I do not know for sure.

• Well, actually "throwing" with your arm onto a flat surface inherently imparts both linear and angular momentum. Try it with a hockey puck instead, same result. The only way to get only linear or angular momentum, even with a puck, is to use some other method of propelling it (like pushing or spinning). – RBarryYoung Jan 19 '16 at 5:17
• But, why is it that both motions start and stop simultaneously? – Yatogami Jan 19 '16 at 5:23
• They start at the same time because they are thrown at time t' and get the impulse. By friction, the energy is also dissipated, once there is no energy there is no velocity and both angular momentum and linear momentum are zero. When the center of mass motion stops any rotational energy will also be dissipated fast, unless a large spin had been applied on purpose. – anna v Jan 19 '16 at 5:33