Wooden arrow vectors, hand held or mountable.
What It Shows:
Various length and color, wooden arrow vectors can be hand-held, placed (magnetically) on the blackboard, or stuck into a wooden block to define a coordinate system. Small vector blocks can be used as body axes or to visualize coordinate transformations.
These props can save the lecturer a lot of hand waving and drawing on the black board, especially if vector summation in three dimensions is being discussed.