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level: 7-9

Questions and Answers List

level questions: 7-9

QuestionAnswer
densitymass per unit volume
pressurethe normal (or perpendicular) force acting per unit cross-sectional area
Archimedes' principlethe upthrust acting on a body is equal to the weight of the liquid or gas that it displaces
compressivedescribes a force that squeezes and shortens an object
tensileassociated with tension or pulling; for example, a tensile force
extensionthe increase in the length of a material from its original length
spring constantthe force per unit extension for a spring; unit is N/m
Hooke's lawprovided the elastic limit is not exceeded, the extension of an object is proportional to the applied force (load).
elastic deformationan object that returns to its initial length when the force is removed has deformed elastically
plastic deformationan object that does not return to its initial length when the force is removed is deformed permanently - it has deformed plastically
limit of proportionalitythe point beyond which extension (of a spring) is no longer proportional to the force
elastic limitthe value of stress beyond which an object (such as a spring) will not return to its original dimensions
strainextension per unit length
stressforce per unit cross-sectional area that acts at right angkes to a surface
Young modulus (of a material)the stress in the material divided by the strain
elastic potential energyenergy stored in a body due to a change in its shape
strain energyenergy stored in a body due to a change in its shape
work donethe product of the force and the distance moved in the direction of the force; the area under a force extension graph