| A5-1 | Friction |
| Purpose: | To demonstrate force of friction. |
| Description: | A wooden block having the shape of a rectangular parallelepiped is pulled across the lecture bench with a large dial balance. The block may be turned on different edges to show the independence of frictional forces on area. Another block with various types of surfaces can be used to show the effects of different kinds of contact planes. |
| References: | Mk-1. |
| Equipment: | large dial balance, rectangular parallelepiped wooden block, wooden block with different kinds of materials adhered on its surfaces. |