Question

Which component of the reaction force between two surfaces in contact is known as the frictional force?

Options

• Perpendicular (normal)

• Parallel (tangential)

• Diagonal

• Vertical

Answer 1

Parallel (tangential)

Explanation:

Frictional force acts along the surface of contact (tangentially) and opposes the relative motion or tendency of motion between the surfaces. The normal reaction force acts perpendicular to the surface.