Question

this image shows the various forces acting on a block of rock situated on a rock slope. which arrow represents shear strength? a) 1 b) 2 c) 4 d) 3

Explanation:

Shear strength resists the sliding of the rock - block along the slope. Force parallel to the slope surface opposes the sliding. Arrow 4 is parallel to the slope surface and represents the shear - strength force that resists the down - slope movement of the rock block.

Answer:

C. 4