Which of the following situations involve friction that can be both favourable and unfavourable?Removing grip on footwearUsing lubricants in an engineIncreasing surface area on car tyresCycling in different weather conditions

Removing grip on footwear: This situation involves friction that can be both favourable and unfavourable. The grip on footwear is designed to increase friction and prevent slipping, which is favourable. However, if the grip is too strong, it can make it difficult to walk or run smoothly, which is unfavourable.

Using lubricants in an engine: This situation primarily involves reducing friction, which is favourable because it allows the engine parts to move more smoothly and reduces wear and tear. However, if too much lubricant is used, it can reduce friction too much and cause the engine parts to slip, which is unfavourable.

Increasing surface area on car tyres: This situation involves friction that can be both favourable and unfavourable. Increasing the surface area on car tyres increases friction, which can provide better grip and control, which is favourable. However, it can also increase resistance and make the car less fuel efficient, which is unfavourable.

Cycling in different weather conditions: This situation involves friction that can be both favourable and unfavourable. In dry conditions, the friction between the tyres and the road is high, which is favourable for control and speed. However, in wet or icy conditions, the friction can be reduced, making it harder to control the bike and increasing the risk of accidents, which is unfavourable.