Question

9. Friction produce........,
It depend on the......
.......of surfaces​

Answer 1

Answer:

It depends on the nature of two surfaces in contact.....

friction produce heat....I think

Answer 2

Answer:

friction causes some of the energy of motion to be converted into heat.

Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.