First slide

Inertial and uniformly accelerated frame of reference

Question

A block of mass m is placed on a smooth wedge of inclination $θ$ . The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block (g is acceleration due to gravity) will be

Difficult

A

$m g \cos θ$
B

$m g \sin θ$
C

$m g$
D

$m g / \cos θ$

Solution

When the whole system is accelerated towards left, then pseudo force (ma) works on a block towards right.
For the condition of equilibrium:
$m g \sin θ = m a \cos θ$
$\Rightarrow a = \frac{g \sin θ}{\cos θ}$
Therefore, force exerted by the wedge on the block
$\begin{array}{l} N = m g \cos θ + m a \sin θ \\ = m g \cos θ + m (\frac{g \sin θ}{\cos θ}) \sin θ \\ = \frac{m g (\cos^{2} θ + \sin^{2} θ)}{\cos θ} = \frac{m g}{\cos θ} \end{array}$

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