Friction

Question 1

What are the 3 main factors effecting dry friction?

Answer 1

1) surface finish
2) materials in contact
3) force pushing the surfaces together

Question 2

What are the disadvantages of friction?

Answer 2

1) Work must be done to overcome friction
2) friction causes wear-parts to be replaced
3) friction causes heat which is expensive to remove

Question 3

What are the advantages of frictions?

Answer 3

Provides a variable force that can be utilised in:

1) clutches and brakes
2) clamping
3) drive belts
4) Tyres on road