A block with a square base measuring 'a' × 'a' and height h, is placed on an inclined plane. The coefficient of friction is μ. The angle of inclination (θ) of the plane is gradually increased. The block will
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Question

A block with a square base measuring 'a' × 'a' and height h, is placed on an inclined plane. The coefficient of friction is μ. The angle of inclination (θ) of the plane is gradually increased. The block will

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G1 Physics · Accepted Answer

Sliding begins at tanθ=µ. Toppling begins when the weight line through the centre reaches the downhill edge: tanθ=a/h. Hence toppling occurs first if µ>a/h, making A correct; sliding first if µ<a/h, making D correct. Thus A,D.