Question

choose the correct answer: Friction between two flat surfaces can be reduced by- a) Greasing,b) painting,c)using ball bearing ,d) decreasing area​

Answer 1

Answer:

Using ball bearing

Explanation:

Due to the ball bearings, rolling friiction comes into effect. By using grease sliding friction comes into effect. Rolling friction is lesse than sliding friction. So using ball bearings have the less friction

Answer 2

Answer:

Greasing

Explanation:

Because we can use the grease everywhere but we can't use the ball bearings everywhere . Also we need the grease in ball bearings. So the greasing is the first opportunity to reduce friction