Question

earth is moving round the sun without slowing down. why?(give answer related to friction)​

Answer 1

Answer:

earth is moving round the sun without slowing down because the gravitational force of sun pulls the earth always in same force.

Answer 2

For friction to occur there must be a medium which can exert the friction forces. For example if a raindrop falls through air there is friction against the air and it reaches some terminal velocity after a few meters. If a car rolls on a street there is friction in the bearings and rolling friction between the road and the tyres which slows it down.