State — 3 marks
A student investigates the elasticity of a metal spring by hanging weights from it and measuring the extension. The spring obeys Hooke's Law up to a load of 5 N. When a 6 N weight is added, the spring does not return to its original length when the weight is removed.
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(a) State what is meant by the elastic limit of a spring.
[1 mark]
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(b) State the maximum load that can be applied to this spring while it remains elastic.
[1 mark]
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(c) State the name of the deformation that occurs when a load of 6 N is applied to the spring.
[1 mark]
Show mark scheme
- (a) The maximum load/force that can be applied before permanent deformation occurs / the point beyond which the material does not return to its original shape/length
- (b) 5 N
- (c) Plastic deformation / inelastic deformation
State — 4 marks
A student investigates the stretching of a rubber band by hanging weights from it. When small weights are added, the rubber band returns to its original length after the weight is removed. However, when heavier weights are added, the rubber band becomes permanently stretched and does not return to its original shape, even after the weight is taken away.
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(a) State the name of the type of deformation that occurs when the rubber band returns to its original length after the weight is removed.
[1 mark]
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(b) State the name of the type of deformation that occurs when the rubber band remains permanently stretched after the weight is removed.
[1 mark]
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(c) State the point during the stretching process when the rubber band changes from elastic deformation to inelastic deformation.
[2 marks]
Show mark scheme
- (a) Elastic deformation (or elastic)
- (b) Inelastic deformation (or inelastic)
- (c) At the limit of proportionality (or elastic limit)
- (c) The point where the material stops obeying Hooke's Law (or where the force and extension are no longer proportional)
GCSE Perfect