1. It is a substance placed between two surface to reduce friction.
2. It is produced when you rub your hands together.
3. It is observed when two solid surfaces slide over each other.
4. It exists between the moving wheels of vehicles and the ground.
5. It occurs when the two objects in contact are not moving.

1.Lubricants are substances that are applied to surfaces to reduce friction between them. Some examples of common lubricants are motor oil, wax, and grease.

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3.When two solid surfaces slide over each other, a frictional force is produced between them, known as kinetic friction also referred to as sliding friction. It is the sliding friction that facilitates us in walking as it is the relationship between gravity, mass and the friction.

4.When two solid surfaces slide over each other, a frictional force is produced between them, known as kinetic friction also referred to as sliding friction. It is the sliding friction that facilitates us in walking as it is the relationship between gravity, mass and the friction.

5.Static friction is friction between two objects that are not moving relative to each other. ... The normal force is the force of the surface pushing up on the object, which is usually equal to the object's weight.

Explanation:

wala ako mahanap sa 2 ehh I hope it helps :).

pa heart and pa brainlest:)