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Frictional forces 

Friction

Block with high friction force on two sides ( sand paper on wood). The other two side are wood on wood.

*You also need a lab jack.

*If you would like to attach this to a push-pull force gauge, please let me know.

Friction 1

Magnetic black board friction demo, made by Pasco Scientific. This has a small wooden block, an angle indicator, with a hanger mounted over a  pulley. Add mass to see what it takes to over come static friction. Instructor can compare the smooth surface force to the kinetic frictional force.