1K20.35 Angle of Repose
Coefficient of friction
To measure the coefficient of static friction, change the angle on a ramp until a small wooden box slides downslope. One can change the contact surface to metal, add moisture, and change the weight of the box.
-  Wooden box with metal slipper
-  Steel brick
-  Wooden board
-  Sponge
-  Water bottle
-  Metre stick
-  Lab stand
-  90-degree clamp
-  3-finger clamp
- Place the ramp on a table.
- Mount a metre stick vertically next to the ramp using the lab stand, 90-degree clamps, and 3-finger clamps.
- Place a metre stick horizontally next to the ramp.
- Put the box on the ramp with metal slipper on and the steel brick inside.
- The steel brick is a bit heavy. Handle with care.
- Ask for a volunteer to help you measure the angle at which the box starts slipping down the ramp.
- Slowly lift one end of the ramp until the box starts slipping.
- Put down the ramp and repeat the experiment for a different mass or surface, if desired.
- PIRA 1K20.35
- Don't attempt this at home!
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.