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  4. In the figure shown, the block of mass m is at rest relative to the wedge of mass M and the wedge is at rest with respect to ground. This implies that

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Q. In the figure shown, the block of mass $m$ is at rest relative to the wedge of mass $M$ and the wedge is at rest with respect to ground. This implies thatPhysics Question Image

Laws of Motion

Solution:

$N=m g \cos \theta, f=m g \sin \theta$
Net force applied by $M$ on $m$ (or $m$ on $M$ ):
$F =\sqrt{N^{2}+f^{2}}$
$=\sqrt{(m g \cos \theta)^{2}+(m g \sin \theta)^{2}}$
$=m g$

Solution Image