Question

B. State whether friction is increased or decreased in the following cases:
1. Using spikes in shoe soles
2. Treading tyres of trucks and bulldozers
3. Lubricating machine parts
4. Rubbing coarse sand on hand by gymnasts​

Answer 1

Answer:

1 . the friction is increased

2. the friction is increased

3. the friction is decreased

4. the friction is increased .

Answer 2

Answer:

increased

increased

decreased

increased