allow the momentum to be set to 0
allow the momentum to be set to 0

crysxd/Parallel-Computing-and-Algorithms-X033537-Project,crysxd/Parallel-Computing-and-Algorithms-X033537-Project,crysxd/Parallel-Computing-and-Algorithms-X033537-Project,crysxd/Parallel-Computing-and-Algorithms-X033537-Project