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Our four sided friction block shows different frictional characteristics affect the force required to move a stationary body. It can be used to teach numerous concepts involving friction, an inclined plane, work, and mathematical calculations. Four friction surfaces: sandpaper, vinyl, paper, wood. Comes with a hook on one side for towing and a threaded brass post allows for easy addition of slotted masses to all four sides. Block dimensions: 2" x 2" x 2".