# Angle of Friction vs. Angle of Repose

Both the terms Angle of Friction and Angle of Repose are widely used in fields like statics and dynamics and most prominently in the field of mechanical engineering. Both the terms have interference of friction in it and that is why angle of friction is also referred as the angle of repose. Though one knowing their definitions and usage under different conditions can easily differentiate it between both the terms. Angle of Friction is the angle between the normal force (N) and the resultant force (R) of normal force and friction, whereas Angle of Repose is the angle of maximum slope, where an object placed just begins to slide. In other words we can say that it is that maximum angle where a body or object can be tilted from the horizontal without falling or collapsing. ## Key Differences

Angle of friction is applicable between the rigid surfaces, whereas angle of repose is used for incline surfaces, especially the granular materials in soil mechanics.
Angle of repose has the real angle while angle of friction is based on the hypothetical angle between the resultant force and the horizon.
Angle of friction is the angle between the normal force (N) and the resultant force (R) of normal force and friction, whereas Angle of Repose is the angle of maximum slope, where an object placed just begins to slide.

## Comparison Chart

### .

Angle of Friction is the angle between the normal force (N) and the resultant force (R) of normal force and friction.
Angle of Repose is the angle of maximum slope, where an object placed just begins to slide.

### Applicable

Angle of friction is applicable between the rigid surfaces.
Angle of repose is used for incline surfaces, especially the granular materials in soil mechanics.

### Angle

Hypothetical Angle
Real Angle