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Physics 11 Online
OpenStudy (anonymous):

A block is placed on a horizontal board having a rough upper surface (ie friction is present). One end of the board is slowly and smoothly raised with the block remaining stationary on the board. The magnitude of the force of friction (more than one answers may be correct) has a constant value of μsmg. increases as the board is raised. decreases as the board is raised. is zero until the block begins to move.

OpenStudy (anonymous):

I think it is zero until the block begins to move. Anyone else think so?

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