In the field of law, the word force has two main meanings: unlawful violence and lawful compulsion. "Forced entry" is an expression falling under the category of unlawful violence; "in force" or "forced sale" would be examples of expressions in the category of lawful compulsion.
When something is said to have been done "by force", it usually implies that it was done by actual or threatened violence ("might"), not necessarily by legal authority ("right"). For example, a person forced against their will to commit an unlawful act they would have not committed if not threatened, would be considered lawful.
"Force of arms" is a special case that can be an example of unlawful violence or lawful compulsion dependent on who is exercising the violence (or threat thereof) and their legal right and/or responsibility to do so.
When one citizen threatens another with a weapon without being in danger from the person he or she is threatening, this would be an example of the unlawful expression of force of arms. The same threat expressed by police officer making a lawful arrest would typically be considered lawful compulsion.
Famous quotes containing the word force:
“Mathematics alone make us feel the limits of our intelligence. For we can always suppose in the case of an experiment that it is inexplicable because we don’t happen to have all the data. In mathematics we have all the data ... and yet we don’t understand. We always come back to the contemplation of our human wretchedness. What force is in relation to our will, the impenetrable opacity of mathematics is in relation to our intelligence.”
—Simone Weil (1909–1943)