Question

1. This image shows the various forces acting on a block of rock situated on a rock slope. What does arrow 4 represent?

A. Shear strength
B. Gravitational force
C. Normal force
D. Shear force​

Answer 1

Gravitational force

Step-by-step explanation:

Answer 2

B. Gravitational force

Step-by-step explanation:

The gravitational force of an object (also called weight) is given by

`F=mg`

where m is the mass of the object and g is the acceleration of gravity, and it always points in the downward direction.

In this problem, the arrow labelled with 4 is the only force pointing downward: therefore, it must be the gravitational force.

The other arrows represent:

1 --> component of the gravitational force parallel to the plane

2 --> force of friction

3 --> component of the gravitational force perpendicular to the plane