Question

while riding on bicycle if we stop peadling why the vicycle does beings to slow down

Answer 1

The roads where we use the cycle are rough and thus have friction so when we stop paddling there remains no force to overtake the friction so then the kinetic friction slows down the bicycle as it continuously subtracts the forward moving force and so after sometime the cycle comes to rest....

Answer 2

The bicycle slows down after stop paddling because of its moment of inertia. It remains the bike still continue in its motion. The value of the bicycle's ring shaped wheel is mr^2, where m is the mass of the wheel and r is the radius of it.