A horizontal force is increased slowly on a block initially at rest on a rough table
PHYSICS · Single correct · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
A horizontal force F is increased slowly on a block initially at rest on a rough table. Which one of the following correctly describes the graph of frictional force f versus applied force F?
(a) f is zero until F exceeds μsN, after which f stays constant at μkN.
(b) f rises along a line of slope 1 from the origin until F=μsN, after which f drops suddenly to a lower constant value.
(c) f rises linearly with F until F=μsN, and then jumps to a higher constant value μkN.
(d) f is equal to μsN for all values of F, whether the block moves or not.