9 A man of 72 Kg weight is standing on a board inclined at $20^{o}$ with the horizontal find the componers of man weight (i) perpendicular to the board (ii) parallel to the plane of time board

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Solution

The weight of man is 72 Kg and he is standing on a board inclined at 20⁰ with the horizontal.

From the figure, it is clear that,

The component of man’s weight perpendicular to the board is

$F_{⊥} = m g cos θ$

$F_{⊥} = 72 cos (20)$

The component of man’s weight parallel to the board is

$F_{∥} = m g sin θ$

$F_{∥} = 72 sin (20)$

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