Question

what type of material causes more/less friction?give three examples

Answer 1

Answer:

Explanation:

this is less friction surface:- A smooth surface has smaller hills and valleys. There are also electrostatic attractions between surfaces, but these are weaker than the physical barriers to sliding. Liquids such as water and oil reduce friction because they keep the two surfaces from contacting each other.

this surface hace more friction:-Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.

Answer 2

Smooth materials give less friction.

Egs.

1) Oils

2) Lubricated surfaces

3) Wet surfaces

Rough materials give more friction.

Egs.

1) Machines without lubrication

2) Our shoes when we walk

3) Dry surfaces