earth is moving round the sun without slowing down. why?(give answer related to friction)
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earth is moving round the sun without slowing down because the gravitational force of sun pulls the earth always in same force.
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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.
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