Scienceeee,seeking for help!!?

Question

1) Give two examples of friction being a useful force in a technical workshop.

2)The grooves on tyres help prevent the vehicle from skidding on slippery surfaces.Explain how these grooves help prevent skidding?

3)Explain why a spring balance is used to measure weight and not mass.

4)Suggest 2 ways in which i can drag a wooden box with lesser friction

Answer 1

1. Friction between shoe and floor so you can walk. Friction between workpiece and clamp/vise or tool and hand holding it.

2. Grooves convey water away from road-tire interface, allowing tire to contact road directly and have better friction.

3. Spring balance measures force, which is weight.

4. Lift box some while dragging. Lubricate floor.