Mech 2
Mech 3
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AS/A2 Mech 2 Mech 3 |
| M1 Topic 5: Statics | |
| Limiting equilibrium |   |
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| The diagram
shows an object of weight W N resting on a rough horizontal surface. The object
is pushed from one side by a force P N and friction responds with force F N in
the opposite direction. R is the normal reaction. For small values of P, no movement occurs and F = P. The roughness of the two surfaces is measured by the value m, which is known as the coefficient of friction. If P increases then F increases to maintain equilibrium until F reaches a maximum value. At this point the object is in limiting equilibrium and is on the point of slipping. In general F £ mR but for limiting equilibrium F = mR |
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