Physics Paper 2, Nov/Dec. 2010  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments

Question 4

(a)          State two differences between solid friction and viscosity.



Responses revealed that solid friction and viscosity topics are poorly treated in schools. Many candidates
had good ideas but could not assemble them together. Some candidates even mismatched points listed.

The expected answers are:

Differences between solid friction and viscosity

Solid friction Viscosity

- Independent of surface area
in contact

Depends on surface area in contact

Depends on normal reaction (of
one solid surface on the other)
Independent of normal reaction

Occurs between solids surfaces
in contact

Occurs between fluid layers/solid and
fluid in contact/in fluids
Independent of relative velocity
(between solid surfaces in contact)
Depends on relative velocity (between fluid


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