| A4-1 | Components of Force, vector sum of forces |
| Purpose: | To demonstrate inertia of rest. |
| Description: | Two large dial type spring balances are attached to the top of a blackboard with a string tied on the hooks of both balances. A known weight is hung at various points from the string. In each case the vectors can easily be placed on the blackboard and equilibrium conditions worked out. |
| References: | Mj-1 |
| Equipment: | two large dial type speing balances, string and weight. |