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Solids and Structures 1 (ENGG110) 2023 Frictional Forces
Solids and Structures 1 (ENGG110) 
2023 
 
 
 
 
 
 
Frictional Forces 
 
 
 
 
 
 
Draw FBD of block 
at rest on inclined surface 
 
 
 
 
 
 
 
 
 
 
Pause the video and try this! 
 
FBD of block 
 
 
 
 
•	W is weight of block = Mg due to gravity acting through G centre of mass 
•	N is normal reaction between block and surface 
•	F is frictional force opposing motion 
 
What is friction? 
Max friction	Min friction