SureDenForce Due to Surface Tension
If a body of weight W is placed on the liquid surface, whose surface tension is T. If F is the minimum force required to pull it away from the water then value of F for different bodies can be calculated by the following table.
|
Body |
Figure |
Force |
|
Needle (Length = l )
|
|
F = 2l T + W |
|
Hollow disc (Inner radius = r1 Outer radius = r2) |
|
F = 2p (r1 + r2)T + W |
|
Thin ring (Radius = r) |
|
F = 2p (r + r)T + W F = 4prT + W |
|
Circular plate or disc (Radius = r) |
|
F = 2prT + W |
|
Square frame (Side = l ) |
|
F = 8l T + W |
|
Square plate
|
|
F = 4l T + W |
