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take the example of earth sun system. The earth is said to orbit around sun because the sun bends the space time around it .

Now if by some means we stop earth in its path such that its at rest with respect to sun then release it , it will immediately start a free fall towards the sun .

Now the question is if the gravity is just bent space time then what is causing the earth at rest to move from rest. What causes the force?

how can you explain both the Einstein bending of space and newtonian force of gravity existing simultaneously?

user1062760
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There is no force on a body falling towards a star. Rather than considering some obviously hypothetical / mad thing like dropping a planet (having first stopped it in its orbit, even more madly), consider dropping a person: do you experience any force in free-fall? Well, then: there is no force, you are just following a geodesic. Remember that there are many geodesics through any given spacetime point: it's not the case that an orbiting body is somehow on the only possible trajectory through a given spacetime point: there are others (indeed an infinity of others), some of which are those which are you falling towards the Sun.