Table 1.

Forces of detachment in terrestrial and aquatic environments. Relative importance: – usually important, – usually not important.

	terrestrial	aquatic	direction	magnitude	determining parameters
gravity			predictable	predictable	mass, acceleration of gravity
buoyancy			predictable	predictable	volume, density
inertial forces			unpredictable	unpredictable	mass, acceleration
lift and drag forces, acceleration reaction force			unpredictable	unpredictable	shape and size, orientation, velocity, fluid density and viscosity