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Resultantkraft.
Resultantkraft er en tenkt kraft som har samme virkning som de gitte kreftene til sammen.
Dersom en gjenstand er påvirket av krefter, kan vi tenke oss at disse blir erstattet med én kraft som påvirker gjenstanden på samme måte. Denne tenkte kraften kaller vi «resultantkraften» eller «summen av kreftene», fordi den, ifølge den såkalte Newtons nulte lov, er vektorsummen av kreftene.
Vektorsummen av to krefter kan en visualisere ved å tegne et kraftparallellogram, der summen er diagonalen fra kraftvektorenes angrepspunkt.
Begrepet inngår i Newtons første og andre lov som omhandler sammenhengen mellom krefter på gjenstander og deres bevegelse.
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