The force causing the Andromeda galaxy and the Milky Way galaxy to move towards each other is gravity. Gravity is the attractive force that exists between objects with mass, and in the case of galaxies, the combined gravitational pull from their mass and the overall mass of the universe attracts them toward one another. Inertia is the property of matter that causes it to resist changes in motion, and friction is a force that opposes motion between surfaces in contact; neither of these forces is responsible for the galaxies' movement towards each other.
What force is causing the Andromeda galaxy and the Milky Way galaxy to move towards each other? friction, inertia. gravity,
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