Question

identifying methods to increase friction
which of these actions will increase friction? select three options.

• scratching a surface to make it rougher
• polishing a surface to make it smoother
• increasing the size of a flying object
• adding extra weight to an object
• placing oil between two surfaces

Explanation:

Friction depends on surface roughness and normal force. Rougher surfaces increase friction. Increasing weight raises normal force, boosting friction. Larger flying objects experience more air friction (a type of friction). Smoothing surfaces or adding lubricants (oil) reduces friction.

Answer:

• scratching a surface to make it rougher
• increasing the size of a flying object
• adding extra weight to an object