Description:

A package, placed on an inclined plane, is retained by the roughness of the support (friction). The 3 forces acting on the mobile: the weight, the reaction of the support which can be broken down into 2 (friction force and normal reaction of the support).

 

Definition
Reaction of the support: Force exerted by a solid (ground, wall ...) on an object in contact with it, perpendicular (normal) to the plane of the solid at the point of contact.

Friction:

Force exerted by a rough solid (floor, wall ...), a liquid or a gas on a body in contact with it, opposed to the actual or probable movement.

 

flash animation