GCSE Physics Specification

OCR B J259

Section P6.3: How does the particle model relate to material under stress?

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#P6.3.1

explain, with examples, that to stretch, bend or compress an object, more than one force has to be applied

#P6.3.2

describe and use the particle model to explain the difference between elastic and plastic deformation caused by stretching forces

#P6.3.3

a) describe the relationship between force and extension for a spring and other simple systems

b) describe how to measure and observe the effect of forces on the extension of a spring
PAG2

#P6.3.4

describe the difference between the force-extension relationship for linear systems and for non-linear systems

#P6.3.5

recall and apply the relationship between force, extension and spring constant for systems where the force-extension relationship is linear:

force exerted by a spring (N) = extension (m) × spring constant (N/m)

#P6.3.6

a) calculate the work done in stretching a spring or other simple system, by calculating the appropriate area on the force-extension graph

b) describe how to safely use apparatus to determine the work done in stretching a spring
PAG2

#P6.3.7

select and apply the relationship between energy stored, spring constant and extension for a linear system:

energy stored in a stretched spring (J) = ½ × spring constant (N/m) × (extension (m))2