Question

Roller skates have ball bearings in the wheels.(give reason)​

Answer 1

Answer:

Ball bearing reduce friction because they roll rather than slide. Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other. Ball bearings tend to have lower load capacity for their size than other kinds of rolling-element bearings due to the smaller contact area between the balls and races.

Answer 2

Answer:

Do you watch Miraculous???