A simple sliding bearing with hard steel surfaces supports a hard steel block of mass 775 kg....

Question

A simple sliding bearing with hard steel surfaces supports a hard steel block of mass 775 kg. Estimate, giving clear justification of any assumptions that you have made:i.the horizontal force that would be required to initiate sliding under the three frictional conditions given in Table 3.1 of Block 4

Robert · Accepted Answer

1
Part A  
(i) Static friction force (working in opposite direction) is given by  
Static friction force =     
Where,  
    coefficient of friction  
   mass of block  
Horizontal force is the minimum force required to start the motion of the block F =      
 Hard steel on self (unlubricated)       ,  
Therefore,  
F =
 Hard steel on self  with mineral oil (Lubricated)       
Therefore,  
F =
 Hard steel on self with molybdenum di-sulphide       
Therefore,  
F =       
=               
=
2
(ii) The horizonatl force required in case of unlubricated  = 4557 N  
Distance d = 7.5 m  
Therefore,  
The amount of work done by 4557 N force and for 7.

A simple sliding bearing with hard steel surfaces supports a hard steel block of mass 775 kg. Estimate, giving clear justification of any assumptions that you have made: i.the horizontal force that...

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