<Table> <Tr> <Th> Material (condition) </Th> <Th> Angle of Repose (degrees) </Th> </Tr> <Tr> <Td> Ashes </Td> <Td> 40 ° </Td> </Tr> <Tr> <Td> Asphalt (crushed) </Td> <Td> 30--45 ° </Td> </Tr> <Tr> <Td> Bark (wood refuse) </Td> <Td> 45 ° </Td> </Tr> <Tr> <Td> Bran </Td> <Td> 30--45 ° </Td> </Tr> <Tr> <Td> Chalk </Td> <Td> 45 ° </Td> </Tr> <Tr> <Td> Clay (dry lump) </Td> <Td> 25--40 ° </Td> </Tr> <Tr> <Td> Clay (wet excavated) </Td> <Td> 15 ° </Td> </Tr> <Tr> <Td> Clover seed </Td> <Td> 28 ° </Td> </Tr> <Tr> <Td> Coconut (shredded) </Td> <Td> 45 ° </Td> </Tr> <Tr> <Td> Coffee bean (fresh) </Td> <Td> 35--45 ° </Td> </Tr> <Tr> <Td> Earth </Td> <Td> 30--45 ° </Td> </Tr> <Tr> <Td> Flour (corn) </Td> <Td> 30--40 ° </Td> </Tr> <Tr> <Td> Flour (wheat) </Td> <Td> 45 ° </Td> </Tr> <Tr> <Td> Granite </Td> <Td> 35--40 ° </Td> </Tr> <Tr> <Td> Gravel (crushed stone) </Td> <Td> 45 ° </Td> </Tr> <Tr> <Td> Gravel (natural w / sand) </Td> <Td> 25--30 ° </Td> </Tr> <Tr> <Td> Malt </Td> <Td> 30--45 ° </Td> </Tr> <Tr> <Td> Sand (dry) </Td> <Td> 34 ° </Td> </Tr> <Tr> <Td> Sand (water filled) </Td> <Td> 15--30 ° </Td> </Tr> <Tr> <Td> Sand (wet) </Td> <Td> 45 ° </Td> </Tr> <Tr> <Td> Snow </Td> <Td> 38 ° </Td> </Tr> <Tr> <Td> Urea (Granular) </Td> <Td> 27 ° </Td> </Tr> <Tr> <Td> Wheat </Td> <Td> 27 ° </Td> </Tr> </Table> <Tr> <Th> Material (condition) </Th> <Th> Angle of Repose (degrees) </Th> </Tr> <Tr> <Td> Ashes </Td> <Td> 40 ° </Td> </Tr> <Tr> <Td> Asphalt (crushed) </Td> <Td> 30--45 ° </Td> </Tr>

What is the difference between angle of friction and angle of repose